Patent Publication Number: US-9432350-B2

Title: System and method for intelligent workload management

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 12/725,241, filed on Mar. 6, 2010, which claims the benefit of U.S. Provisional Patent Application Ser. No. 61/264,562, entitled “System and Method for Intelligent Workload Management,” filed on Nov. 25, 2009, the contents of which are hereby incorporated by reference in entirety. 
     In addition, this application is further related to U.S. patent application Ser. No. 12/725,263, entitled “System and Method for Recording Collaborative Information Technology Processes in an Intelligent Workload Management System,” filed on Mar. 16, 2010 and now issued as U.S. Pat. No. 8,543,916, U.S. patent application Ser. No. 12/727,837, entitled “System and Method for Managing Information Technology Models in an Intelligent Workload Management System,” filed on Mar. 19, 2010 and now issued as U.S. Pat. No. 7,096,178, U.S. patent application Ser. No. 12/762,015, entitled “System and Method for Discovery Enrichment in an Intelligent Workload Management System,” filed on Apr. 16, 2010 and now issued as U.S. Pat. No. 8,695,075, U.S. patent application Ser. No. 12/900,866, entitled “System and Method for Providing Service Layer Blueprints in an Intelligent Workload Management System,” filed on Oct. 8, 2010 and now issued as U.S. Pat. No. 8,448,170, co-pending U.S. patent application Ser. No. 12/757,674, entitled “System and Method for Providing Scorecards to Visualize Services in an Intelligent Workload Management System,” filed on Apr. 9, 2010, and co-pending U.S. patent application Ser. No. 12/645,114, entitled “System and Method for Controlling Cloud and Virtualized Data Centers in an Intelligent Workload Management System,” filed on Dec. 22, 2009, each of which further claim benefit to U.S. Provisional Patent Application Ser. No. 61/264,562, and each of which are hereby further incorporated by reference in entirety. 
    
    
     FIELD OF THE INVENTION 
     The invention relates to a system and method for intelligent workload management, and in particular, to a computing environment having a model-driven, service-oriented architecture for creating collaborative threads to manage workloads, wherein the management threads may converge information for managing identities and credentials, enforcing policies, providing compliance assurances, managing provisioned and requested services, and managing physical and virtual infrastructure resources, among other things. 
     BACKGROUND OF THE INVENTION 
     “Cloud computing” generally refers to a computing environment with dynamically scalable and often virtualized resources, which are typically provided as services over the Internet. For example, cloud computing environments often employ the concept of virtualization as a preferred paradigm for hosting workloads on any appropriate hardware. The cloud computing model has become increasingly viable for many enterprises for various reasons, including that the cloud infrastructure may permit information technology resources to be treated as utilities that can be automatically provisioned on demand, while also limiting the cost of services to actual resource consumption. Moreover, consumers of resources provided in cloud computing environments can leverage technologies that might otherwise be unavailable. Thus, as cloud computing and cloud storage become more pervasive, many enterprises will find that moving data center to cloud providers can yield economies of scale, among other advantages. 
     However, while much of the information technology industry moves toward cloud computing and virtualization environments, existing systems tend to fall short in adequately addressing concerns relating to managing or controlling workloads and storage in such environments. For example, cloud computing environments are generally designed to support generic business practices, meaning that individuals and organizations typically lack the ability to change many aspects of the platform. Moreover, concerns regarding performance, latency, reliability, and security present significant challenges, as outages and downtime can lead to lost business opportunities and decreased productivity, while the generic platform may present governance, risk, and compliance concerns. In other words, once organizations deploy workloads beyond the boundaries of their data centers, lack of visibility into the computing environment may result in significant management problems. 
     While these types of problems tend to be pervasive in cloud computing and virtualization environments due to the lack of transparency, existing systems for managing and controlling workloads that are physically deployed and/or locally deployed in home data centers tend to suffer from many similar problems. In particular, information technology has traditionally been managed in silos of automation, which are often disconnected from one another. For example, help desk systems typically involve a customer submitting a trouble ticket to a remedy system, with a human operator then using various tools to address the problem and close the ticket, while monitoring systems that watch the infrastructure to remediate problems may remain isolated from the interaction between the customer and the help desk despite such interaction being relevant to the monitoring system&#39;s function. 
     As such, because existing systems for managing infrastructure workloads operate within distinct silos that typically do not communicate with one another, context that has been exchanged between two entities can often be lost when the workload moves to the next step in the chain. When issues surrounding workload management are considered in the context of business objectives, wherein information technology processes and business issues collectively drive transitions from one silo to another, modern business tends to move at a speed that outpaces information technology&#39;s ability to serve business needs. Although emerging trends in virtualization, cloud computing, appliances, and other models for delivering services have the potential to allow information technology to catch up with the speed of business, many businesses lack the knowledge needed to intelligently implement these new technologies. 
     For example, emerging service delivery models often lead to deployed services being composed and aggregated in new and unexpected ways. In particular, rather than designing and modeling systems from the ground up, new functionality is often generated on-the-fly with complex building blocks that tend to include various services and applications that have traditionally been isolated and stand-alone. As such, even though many emerging service delivery models provide administrators and users with a wider range of information technology choices than have ever before been available, the diversity in technology often compounds business problems and increases the demand for an agile infrastructure. Thus, despite the advantages and promise that new service delivery models can offer businesses, existing systems tend to fall short in providing information technology tools that can inform businesses on how to intelligently implement an information technology infrastructure in a manner that best leverage available technology to suit the particular needs of a business. 
     SUMMARY OF THE INVENTION 
     According to one aspect of the invention, a system and method for intelligent workload management may generally provide a computing environment having a fluid architecture, whereby the computing environment may create common threads to manage workloads that converge information relating to user identities and access credentials, provisioned and requested services, and physical and virtual infrastructure resources, among other things. In one implementation, services provided in the computing environment may generally include various aggregated physical and/or virtual resources, while applications may include various aggregated services and workloads may include various compositions of whole services, separate services, and/or sub-services that work together. For example, in response to a user requesting a service that performs a particular function or application, the intelligent workload management system (or alternatively “the workload management system”) may create a workload to manage provisioning the user with a tuned appliance configured to perform the particular function or application, whereby the tuned appliance may provide the requested service for the user. To manage the workload, the workload management system may create a resource store that points to a storage location for the appliance, declare a service level agreement and any runtime requirements that constrain deployment for the appliance, obtain a certificate that provides attestation tokens for the user and the appliance, and create a profile that provides an audit trail of actual lifecycle behavior for the appliance (e.g., events and performance metrics relating to the appliance). Thus, workflows created in the computing environment may converge various sources of information within a common thread, which the workload management system may use to manage the workload (e.g., actual metrics for a particular workload can be compared to anticipated metrics for the workload to determine whether various services underlying the workload function as intended). 
     According to one aspect of the invention, the system and method for intelligent workload management may operate in a model-driven architecture, which may merge information relating to user identities with services that may be running in an information technology infrastructure. As such, the information merged in the model-driven architecture may be referenced to determine specific users or organizational areas within the infrastructure that may be impacted in response to a particular change to the infrastructure model. Thus, whereas information technology has traditionally been managed within disparate silos, where context exchanged between any two entities may be lost at the next step in the chain, the model-driven architecture may track context for information technology workloads from start to finish. As such, tracking context for the information technology workloads may provide audit trails that can then be used to identify a relevant user, application, system, or other entity that can provide assistance with a particular issue. Moreover, in the context of managing workloads for virtualized services, where different users typically have to communicate with one another on-demand, the audit trail that the model-driven architecture enables may track end-to-end workload activities and thereby provide visibility and notice to users, applications, systems, services, or any other suitable entity that may be impacted by the workload. 
     According to one aspect of the invention, the system and method for intelligent workload management may enable agile and flexible management for an information technology infrastructure, which may enable the infrastructure to move at the speed of modern business. For example, the system and method for intelligent workload management may further operate in a service-oriented architecture unifying various heterogeneous technologies, which may provide businesses with the capability to deploy information technology resources in a manner that can meet business objectives. For example, the service-oriented architecture may provide adaptable, interoperable, and user-friendly information technology tools to manage the infrastructure in a manner that addresses many typical business challenges that information technology organizations face. For example, while the model-driven architecture may employ virtualization features to provide manageable workloads that can move efficiently through the infrastructure, the service-oriented architecture may merge different technologies to provide various coordinated systems that can cooperate to optimally execute portions of an overall orchestrated workload. As such, the model-driven and service-oriented architectures may collectively derive data from the information technology infrastructure, which may inform intelligent information technology choices that meet the needs of businesses and users. 
     According to one aspect of the invention, the system and method for intelligent workload management may be used to manage workloads created in response to service requests. For example, any suitable user, application, system, or other entities may request a service from the workload management system, wherein the request may include a desired performance level (or service level) for the service, any components or criteria required for the service, comments to provision the service in a certain manner, or any other suitable information for the requested service. In response to receiving the service request, human and/or automated approvers (or service delivery managers) may collaboratively manage the service request and determine whether the service can be provisioned as requested. Furthermore, the approvers may provide feedback on the service provisioning decision, which may create an interactive collaborative “conversation” between requesters, approvers, and other entities in the management thread. In one implementation, various security policies may be built into the model to automatically approve or deny certain requests, wherein the security policies may be dynamically updated in response to handling similar requests (e.g., a request for Bit Torrent storage may be automatically denied because a particular security policy indicates that peer-to-peer file sharing violates a company policy). 
     According to one aspect of the invention, services provisioned in the workload management system may include any suitable combination of physical infrastructure resources and virtualized infrastructure resources. For example, to provision virtualized services that can abstract underlying physical platforms and share computing resources in a manner that may address many needs for immediacy in business environments, the workload management system may manage physical infrastructure resources and virtualized infrastructure resources to support provisioning virtualized services. Thus, the service-oriented architecture employed in the workload management system may enable management for the physical infrastructure resources (e.g., rack-mounting, configuring, and otherwise physically installing servers, storage resources, and other devices), and may further enable management for the virtualized infrastructure resources (e.g., pre-configuring provisioned services with identity management features, denying, flagging, or auditing service requests from unauthorized entities, etc.). Moreover, the workload management system may be considered a service in that the workload management service may be built dynamically in response to service requests (e.g., because a management infrastructure can introduce computational burdens just as any other resource, limiting the existence of the workload management infrastructure to an on-demand service can free computational resources for other tasks having a greater need for immediacy). 
     According to one aspect of the invention, to manage collaborative service provisioning in contexts that combine physical and virtualized resources, the workload management system may store a history of interaction between requesters, approvers, and other entities in service provisioning threads, and may further record, log, and save traffic and activity between such entities in the service provisioning threads. As such, various processes that occur during service provisioning may be recorded and injected into a real-time stream that can subsequently be played back, thereby capturing the service provisioning processes as a whole, including any responses that human and/or automated entities may provide during the collaborative process. During processes for collaboratively managing the information technology infrastructure, the workload management system may expose portions of the infrastructure model to entities involved in the management processes. In one implementation, the workload management system may expose “just enough context” to entities involved in the management processes, whereby the involved entities may view the respective portions of the infrastructure model for which such entities have management responsibility (e.g., prior to implementing any particular change to the infrastructure, the workload management system may query the model and determine an impact of the change, notify impacted entities, etc.). 
     According to one aspect of the invention, virtualized services provisioned in the workload management system may further include injection points for adding and/or removing information from the provisioned services. For example, any particular virtualized service may generally include a layered architecture that includes injection points for inserting “zero residue” management agents that can manage the service and ensure that the service functions correctly. Thus, in one implementation, zero residue management agents may be inserted within virtualized services at build time, run time, or any other suitable point in a lifecycle for the virtualized services, wherein the particular management agents inserted within the virtualized services may depend on a type of management required. For example, the workload, management system may analyze a configuration of the service, a lifecycle point for the service, or other suitable information for the service to derive a recipe of the management agents to be injected (e.g., the recipe may depend on a required service level for the service, a current operational state for the infrastructure model, services running in the infrastructure, a type of management required for the running services, etc.). 
     Other objects and advantages of the invention will be apparent to those skilled in the art based on the following drawings and detailed description. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  illustrates a block diagram of an exemplary model-driven architecture in a system for intelligent workload management, according to one aspect of the invention. 
         FIG. 1B  illustrates a block diagram of an exemplary service-oriented architecture in the system for intelligent workload management, according to one aspect of the invention. 
         FIG. 2  illustrates a flow diagram of an exemplary method for intelligent workload management, according to one aspect of the invention. 
         FIG. 3  illustrates an exemplary system for generating single sign-on workload identities in the workload management system, according to one aspect of the invention. 
         FIG. 4  illustrates an exemplary method for generating single sign-on workload identities in the workload management system, according to one aspect of the invention. 
         FIG. 5A  illustrates a block diagram of an exemplary service distribution that can be managed with zero residue management agents in the intelligent workload management system, while  FIG. 5B  illustrates an exemplary lifecycle for a service distribution managed with the zero residue management agents, according to one aspect of the invention. 
         FIG. 6  illustrates a flow diagram of an exemplary method for managing different modes of a service distribution lifecycle with the zero residue management agents in the intelligent workload management system, according to one aspect of the invention. 
     
    
    
     DETAILED DESCRIPTION 
     According to one aspect of the invention,  FIG. 1A  illustrates an exemplary model-driven architecture  100 A in a system for intelligent workload management, while  FIG. 1B  illustrates an exemplary service-oriented architecture  100 B in the system for intelligent workload management. In one implementation, the model-driven architecture  100 A shown in  FIG. 1A  and the service-oriented architecture  100 B shown in  FIG. 1B  may include various components that operate in a substantially similar manner to provide the functionality that will be described in further detail herein. Thus, any description provided herein for components having identical reference numerals in  FIGS. 1A and 1B  will be understood as corresponding to such components in both  FIGS. 1A and 1B , whether or not explicitly described. 
     In one implementation, the model-driven architecture  100 A illustrated in  FIG. 1A  and the service-oriented architecture  100 B illustrated in  FIG. 1B  may provide an agile, responsive, reliable, and interoperable information technology environment, which may address various problems associated with managing an information technology infrastructure  110  (e.g., growing revenues and cutting costs, managing governance, risk, and compliance, reducing times to innovate and deliver products to markets, enforcing security and access controls, managing heterogeneous technologies and information flows, etc.). To that end, the model-driven architecture  100 A and the service-oriented architecture  100 B may provide a coordinated design for the intelligent workload management system (or alternatively “the workload management system”), wherein the coordinated design may integrate technologies for managing identities, enforcing policies, assuring compliance, managing computing and storage environments, providing orchestrated virtualization, enabling collaboration, and providing architectural agility, among other things. The model-driven architecture  100 A and the service-oriented architecture  100 B may therefore provide a flexible framework that may enable the workload management system to allocate various resources  114  in the information technology infrastructure  110  in a manner that balances governance, risk, and compliance with capacities for internal and external resources  114 . For example, as will be described in further detail herein, the workload management system may operate within the flexible framework that the model-driven architecture  100 A and the service-oriented architecture  100 B to deliver information technology tools for managing security, performance, availability, and policy objectives for services provisioned in the information technology infrastructure  110 . 
     Identity Management 
     In one implementation, as noted above, the technologies integrated by the model-driven architecture  100 A and the service-oriented architecture  100 B may enable managing identities in the information technology infrastructure  110 . In particular, managing identities may present an important concern in the context of managing services in the information technology infrastructure  110  because security, performance, availability, policy objectives, and other variables may have different importance for different users, customers, applications, systems, or other resources  114  that operate in the information technology infrastructure  110 . As such, the model-driven architecture  100 A and the service-oriented architecture  100 B may include various components that enable identity management in the information technology infrastructure  110 . 
     For example, in one implementation, the workload management system may include an access manager  120  (e.g., Novell Access Manager), which may communicate with an identity vault  125  and control access to content, applications, services, and other resources  114  in the information technology infrastructure  110 . In one implementation, the access manager  120  may enforce various policy declarations to provide authentication services for any suitable component in the information technology infrastructure  110 . For example, the identity vault  125  may include various directories that organize user accounts, roles, policies, and other identity information that the access manager  120  can reference to generate authorization decisions. The access manager  120  and the identity vault  125  may further support federated user identities, wherein a user at any particular client resource  115  may submit single sign-on authentication credentials to the access manager  120 , which may then control access to any suitable resource  114  in the information technology infrastructure  110  with the single sign-on authentication credentials (e.g., user names, identifiers, passwords, smart cards, biometrics, etc.). Moreover, the identity information stored in the identity vault  125  may be provided to a synchronization engine  150 , whereby the synchronization engine  150  may provide interoperable and transportable identity information throughout the architecture (e.g., via an identity fabric within an event bus  140  that manages transport throughout the architecture). 
     In one implementation, providing the identity information stored in the identity vault  125  to the synchronization engine  150  may form portable identities that correspond to independent digital representations for various users, applications, systems, or other entities that interact with the information technology infrastructure  110 . In particular, the identities maintained in the synchronization engine  150  may generally include abstractions that can provide access to authoritative attributes, active roles, and valid policies for entities that the identity abstractions represent. Thus, synchronizing the identity information stored in the identity vault  125  with the synchronization engine  150  may provide independent and scalable digital identities that can be transported across heterogeneous applications, services, networks, or other systems, whereby the workload management system may handle and validate the digital identities in a cooperative, interoperable, and federated manner. 
     In one implementation, the identities stored in the identity vault  125  and synchronized with the synchronization engine  150  may be customized to define particular attributes and roles that the identities may expose. For example, a user may choose to create one identity that exposes every attribute and role for the user to applications, services, or other systems that reside within organizational boundaries, another identity that limits the attributes and roles exposed to certain service providers outside the organizational boundaries, and another identity that provides complete anonymity in certain contexts. The identities maintained in the synchronization engine  150  may therefore provide awareness over any authentication criteria that may be required to enable communication and collaboration between entities that interact with the workload management system. For example, the synchronization engine  150  may include a service that can enforce policies controlling whether certain information stored in the identity vault  125  can be shared (e.g., through the access manager  120  or other information technology tools that can manage and customize identities). 
     In one implementation, the workload management system may further manage identities in a manner that enables infrastructure workloads to function across organizational boundaries, wherein identities for various users, applications, services, and other resources  114  involved in infrastructure workloads may be managed with role aggregation policies and logic that can support federated authentication, authorization, and attribute services. For example, in one implementation, the access manager  120 , the identity vault  125 , and the synchronization engine  150  may manage identity services externally to applications, services, and other resources  114  that consume the identities, which may enable the workload management system to control access to services for multiple applications using consistent identity interfaces. In particular, the access manager  120 , the identity vault  125 , and the synchronization engine  150  may define standard interfaces for managing the identity services, which may include authentication services, push authorization services (e.g., tokens, claims, assertions, etc.), pull authorization services (e.g., requests, queries, etc.), push attribute services (e.g., updates), pull attribute services (e.g., queries), and audit services. 
     As such, in one implementation, the workload management system may employ the identity services provided in the model-driven architecture  100 A and the service-oriented architecture  100 B to apply policies for representing and controlling roles for multiple identities within any particular session that occurs in the information technology infrastructure  110 . For example, in response to a session that includes a user logging into a client machine  115  and invoking a backup service, the workload management system may manage the session with multiple identities that encompass the user, the backup service, and the client machine  115 . The workload management system may further determine that the identity for the client machine  115  represents an unsecured machine that resides outside an organizational firewall, which may result in the workload management system retrieving a policy from the identity vault  125  and/or the synchronization engine  150  and applying the policy to the session (e.g., the policy may dynamically prevent the machine  115  and the user from being active in the same session). Thus, the workload management system may manage multiple identities that may be involved in any particular service request to control and secure access to applications, services, and other resources  114  in the information technology infrastructure  110 . 
     In one implementation, the model-driven architecture  100 A and the service-oriented architecture  100 B may further provide identity services for delegating rights in delegation chains that may involve various different levels of identities. In particular, any particular user may have various roles, attributes, or other identities that define various rights for the user. As such, in one implementation, the rights delegation identity service may enable the user to delegate a time-bounded subset of such rights to a particular service, wherein the service can then make requests to other services on behalf of the user during the delegated time. For example, a user may delegate rights to a backup service that permits the backup service to read a portion of a clustered file system  195  during a particular time interval (e.g., 2 a.m. to 3 a.m.). In response to the file system  195  receiving the read request from the backup service, the identity services may enable the file system  195  to audit identities for the backup service and the user, and further to constrain read permissions within the file system  195  based on the relevant rights defined by the identities for the backup service for the user. 
     In one implementation, the model-driven architecture  100 A and the service-oriented architecture  100 B may further provide identity services for defining relative roles, wherein relative roles may be defined where a principal user, application, service, or other entity can only assume a particular role for a particular action when a target of the action has a particular set of identities. For example, a user having a doctor role may only assume a doctor-of-record relative role if an identity for a target of the doctor-of-record action refers to one of the user&#39;s patients. In another example, applications may request controlled access to information about an identity for a certain user, wherein the application may retrieve the requested information directly from the access-controlled identity for the user. In particular, the workload management system may determine the information requested by the application and create a workload that indicates to the user the information requested by the application and any action that the application may initiate with the requested information. The user may then make an informed choice about whether to grant the application access to the requested information. Thus, having identities to enable applications may eliminate a need for application-specific data storage or having the application access separate a directory service or another identity information source. 
     Thus, in the model-driven architecture  100 A and the service-oriented architecture  100 B, the identity management services may create crafted identities combined from various different types of identity information for various users, applications, services, systems, or other information technology resources  114 . In one implementation, while the identity information may generally be stored and maintained in the identity vault  125 , the identity information can be composed and transformed through the access manager  120  and/or the synchronization engine  150 , with the resulting identity information providing authoritative, statements for represented entities that span multiple authentication domains within and/or beyond boundaries for the information technology infrastructure  110 . For example, an identity for a user may be encapsulated within a token that masks any underlying credential authentication, identity federation, and attribute attestation. Moreover, in one implementation, the identity services may further support identities that outlive entities that the identities represent and multiple identity subsets within a particular identity domain or across multiple identity domains. As such, the identity services provided in the model-driven architecture  100 A and the service-oriented architecture  100 B may include various forms of authentication, identifier mapping, token transformation, identity attribute management, and identity relationship mapping. 
     Policy Enforcement 
     In one implementation, as noted above, the technologies integrated by the model-driven architecture  100 A and the service-oriented architecture  1006  may enable enforcing policies in the information technology infrastructure  110 . In particular, enforcing policies may present an important concern in the context of managing services in the information technology infrastructure  110  because policies may be driven from multiple hierarchies and depend on operational, legislative, and organizational requirements that can overlap, contradict, and/or override each other. As such, the model-driven architecture  100 A and the service-oriented architecture  100 B may include various components for defining policies in standardized languages that can be translated, merged, split, or otherwise unified as needed. To that end, the workload management system may have multiple policy decision points and policy definition services for consistently managing and enforcing policies in the information technology infrastructure  110   
     As such, in one implementation, the model-driven architecture  100 A and the service-oriented architecture  100 B may provide standard policy languages and service interfaces that enable the workload management system to make consistent decisions based on flexible user needs. In particular, any suitable resource  114  (including workloads and computational infrastructure) may be provided with access to standardized instrumentation that provides knowledge regarding information that may be available, desired, or allowed in the workload management system. In one implementation, the workload management system may invoke various cooperating policy services to determine suitable physical resources  114   a  (e.g., physical servers, hardware devices, etc.), virtualized resources  114   b  (e.g., virtual machine images, virtualized servers, etc.), configuration resources  114   c  (e.g., management agents, translation services, etc.), storage resources (e.g., the clustered file system  195 , one or more databases  155 , etc.), or other resources  114  for a particular workload. For example, the synchronization engine  150  may dynamically retrieve various policies stored in the databases  155 , and an event audit service  135   b  may then evaluate the policies maintained in the synchronization engine  150  independently from services that subsequently enforce policy decisions (e.g., the event audit service  135   b  may determine whether the policies permit access to certain information for a particular application and the application may then enforce the policy determination). 
     In one implementation, separating policy evaluation within the event audit service  135   b  from policy enforcement within consuming services may enable the workload management system to access the consuming services and manage policy-based control for the service in an independent and simultaneous manner. The event audit service  135   b  may include a standardized policy definition service that can be used to define policies that span multiple separate application and management domains. For example, in one implementation, the policy definition service may create, manage, translate, and/or process policies separately from other service administration domains and interfaces. As such, the policy definition service may provide interoperability for the separate domains and interfaces, and may further enable compliance services that may be provided in a correlation system  165  and remediation services that may be provided in a workload service  135   a.    
     In one implementation, to ensure correct and effective policy decisions, the policy definition service provided within the event audit service  135   b  may be configured to obtain data relating to a current state and configuration for resources  114  managed in the infrastructure  110  in addition to data relating to dependencies or other interactions between the managed resources  114 . For example, a management infrastructure  170  may include a discovery engine  180   b  that dynamically monitors various events that the infrastructure  110  generates and pushes onto the event bus  140 , which may include an event backplane for transporting the events. Moreover, the discovery engine  180   b  may query the infrastructure  110  to determine relationships and dependencies among users, applications, services, and other resources  114  in the infrastructure  110 . As such, the discovery engine  180   b  may monitor the event bus  140  to obtain the events generated in the infrastructure  110  and synchronize the events to the synchronization engine  150 , and may further synchronize information relating to the relationships and dependencies identified in the infrastructure  110  to the synchronization engine  150 . In one implementation, the event audit service  135   b  may then evaluate any events, resource relationships, resource dependencies, or other information describing the operational state and the configuration state of the infrastructure  110  in view of any relevant policies and subsequently provide any such policy evaluations to requesting entities. 
     In one implementation, the policy definition service may include standard interfaces for defining policies in terms of requirements, controls, and rules. For example, the requirements may generally be expressed in natural language in order to describe permitted functionality, prohibited functionality, desirable functionality, and undesirable functionality, among other things (e.g., the event audit service  135   b  may capture legislative regulations, business objectives, best practices, or other policy-based requirements expressed in natural language). The controls may generally associate the requirements to particular objects that may be managed in the workload management system, such as individual users, groups of users, physical resources  114   a , virtualized resources  114   b , or any other suitable object or resource  114  in the infrastructure  110 . In one implementation, the policy definition service may further define types for the controls. For example, the type may include an authorization type that associates an identity with a particular resource  114  and action (e.g., for certain identities, authorizing or denying access to a system or a file, permission to alter or deploy a policy, etc.), or the type may include an obligation type that mandates a particular action for an identity. 
     Thus, in one implementation, translating requirements into controls may partition the requirements into multiple controls that may define policies for a particular group of objects. Furthermore, rules may apply certain controls to particular resources  114 , wherein rules may represent concrete policy definitions. For example, the rules may be translated directly into a machine-readable and machine-executable format that information technology staff may handle and that the event audit service  135   b  may evaluate in order to manage policies. In one implementation, the rules may be captured and expressed in any suitable domain specific language, wherein the domain specific language may provide a consistent addressing scheme and data model to instrument policies across multiple domains. For example, a definitive software library  190  may include one or more standardized policy libraries for translating between potentially disparate policy implementations, which may enable the event audit service  135   b  to provide federated policies interoperable across multiple different domains. As such, the rules that represent the policy definitions may include identifiers for an originating policy implementation, which the policy definition service may then map to the controls that the rules enforce and to the domain specific policy language used in the workload management system (e.g., through the definitive software library  190 ). 
     Compliance Assurance 
     In one implementation, as noted above, the technologies integrated by the model-driven architecture  100 A and the service-oriented architecture  100 B may enable monitoring for compliance assurances in the information technology infrastructure  110 . In particular, compliance assurance may present an important concern in the context of managing services in the information technology infrastructure  110  because policy enforcement encompasses issues beyond location, access rights, or other contextual information within the infrastructure (e.g., due to increasing mobility in computing environments). As such, the model-driven architecture  100 A and the service-oriented architecture  100 B may define metadata that bounds data to characteristics of data. To that end, the workload management system may employ a standard metadata format to provide interoperability between policies from multiple organizations to enable the policies to cooperate with one another and provide policy-based service control. For example, certain infrastructure workloads may execute under multiple constraints defined by users, the infrastructure  110 , sponsoring organizations, or other entities, wherein compliance assurance may provide users with certification that the workloads were properly assigned and executed according to the constraints. In another example, sponsoring organizations and governing bodies may define control policies that constrain workloads, wherein compliance assurance in this context may include ensuring that only authorized workloads have been executed against approved resources  114 . 
     As such, in one implementation, the model-driven architecture  100 A and the service-oriented architecture  100 B may provide preventative compliance assurance through a compliance management service that supports remediation in addition to monitoring and reporting. For example, when workloads move from data centers internal to the infrastructure  110  into third party processing centers, cloud computing environments, or other environments having reusable computing resource pools where services can be relocated, the workload management system may generate compliance reports  145  that indicate whether any constraints defined for the workloads have been satisfied (e.g., that authorized entities perform the correct work in the correct manner, as defined within the workloads). Thus, compliance may generally be defined to include measuring and reporting on whether certain policies effectively ensure confidentiality and availability for information within workloads, wherein the resulting compliance reports  145  may describe an entire process flow that encompasses policy definition, relationships between configurations and activities that do or do not comply with the defined policies, and identities of users, applications, services, systems, or other resources  114  involved in the process flow. 
     In one implementation, the workload management system may provide the compliance management service for workloads having specifications defined by users, and further for workloads having specifications defined by organizations. For example, users may generally define various specifications to identify operational constraints and desired outcomes for workloads that the users create, wherein the compliance management service may certify to the users whether or not the operational constraints and desired outcomes have been correctly implemented. With respect to organizational workloads, organizations may define various specifications identifying operational constraints and desired outcomes for ensuring that workloads comply with governmental regulations, corporate best practices, contracts, laws, and internal codes of conduct. Thus, the compliance management service may integrate the identity management services and the policy definition service described above to provide the workload management system with control over configurations, compliance event coverage, and remediation services in the information technology infrastructure  110 . 
     In one implementation, the compliance management service may operate within a workload engine  180   a  provided within the management infrastructure  170  and/or a workload service  135   b  in communication with the synchronization engine  150 . The workload engine  180   a  and/or the workload service  135   b  may therefore execute the compliance management service to measure and report on whether workloads comply with relevant policies, and further to remediate any non-compliant workloads. For example, the compliance management service may use the integrated identity management services to measure and report on users, applications, services, systems, or other resources  114  that may be performing operational activity that occurs in the information technology infrastructure  110 . In particular, the compliance management service may interact with the access manager  120 , the identity vault  125 , the synchronization engine  150 , or any other suitable source that provides federated identity information to retrieve identities for the entities performing the operational activity, validate the identities, determine relationships between the identities, and otherwise map the identities to the operational activity. For example, in one implementation, the correlation system  165  may provide analytic services to process audit trails for any suitable resource  114  (e.g., correlating the audit trails and then mapping certain activities to identities for resources  114  involved in the activities). Furthermore, in response to the correlation system  165  processing the audit trails and determining that certain policies have been violated, the correlation system  165  may invoke one or more automated remediation workloads to initiate appropriate action for addressing the policy violations. 
     In one implementation, the compliance management service may further use the integrated policy definition service to monitor and report on the operational activity that occurs in the information technology infrastructure  110  and any policy evaluation determinations that the event audit service  135   b  generates through the policy definition service. For example, in one implementation, the workload engine  180   a  and/or the workload service  135   b  may retrieve information from a configuration management database  185   a  or other databases  155  that provide federated configuration information for managing the resources  114  in the information technology infrastructure  110 . The workload engine  180   a  and/or the workload service  135   b  may therefore execute the compliance management service to perform scheduled and multi-step compliance processing, wherein the compliance processing may include correlating operational activities with identities and evaluating policies that may span various different policy domains in order to govern the information technology infrastructure  110 . To that end, the model-driven architecture  100 A and the service-oriented architecture  100 B may provide various compliance management models may be used in the compliance management service. 
     In one implementation, the compliance management models may include a wrapped compliance management model that manages resources  114  lacking internal awareness over policy-based controls. The compliance management service may augment the resources  114  managed in the wrapped compliance model with one or more policy decision points and/or policy enforcement points that reside externally to the managed resources  114  (e.g., the event audit service  135   b ). For example, the policy decision points and/or the policy enforcement points may intercept any requests directed to the resources  114  managed in the wrapped compliance model, generate policy decisions that indicate whether the resources  114  can properly perform the requests, and then enforce the policy decisions (e.g., forwarding the requests to the resources  114  in response to determining that the resources  114  can properly perform the requests, denying the requests in response to determining that the resources  114  can properly perform the requests, etc.). Thus, because the resources  114  managed in the wrapped compliance model generally perform any requests that the resources  114  receive without considering policy-based controls or compliance issues, the event audit service  135   b  may further execute the compliance management service to wrap, coordinate, and synthesize an audit trail that includes data obtained from the managed resources  114  and the wrapping policy definition service. 
     In one implementation, the compliance management models may include a delegated compliance management model to manage resources  114  that implement a policy enforcement point and reference an external policy decision point, wherein the resources  114  managed in the delegated compliance management model may have limited internal awareness over policy-based controls. As such, in one implementation, the compliance management service may interleave policy decisions or other control operations generated by the external policy decision point with the internally implemented policy, enforcement point to provide compliance assurance for the resources  114  managed in the delegated compliance management model. The delegated compliance management model may therefore represent a hybrid compliance model, which may apply to any suitable service that simultaneously anticipates compliance instrumentation but lacks internal policy control abstractions (e.g., the internally implemented policy enforcement point may anticipate the compliance instrumentation, while the externally referenced policy decision point has the relevant policy control abstractions). Thus, in the delegated compliance management model, the compliance management service may have fewer objects to coordinate than in the wrapped compliance management model, but the event audit service  135   b  may nonetheless execute the compliance management service to coordinate and synthesize an audit trail that includes data obtained from the managed resources  114  and the delegated external policy decision point. 
     In one implementation, the compliance management models may include an embedded compliance management model that manages resources  114  that internally implement policy enforcement points and policy decision points, wherein the resources  114  managed in the embedded compliance management model may have full internal awareness over policy-based controls. As such, in one implementation, the resources  114  managed in the embedded compliance management model may employ the internally implemented policy enforcement points and policy decision points to instrument any service and control operations for requests directed to the resources  114 . In one implementation, to provide flexible compliance assurance, resources  114  managed in the embedded compliance management model may expose configuration or customization options via an externalized policy administration point. Thus, the embedded compliance management model may provide an integrated and effective audit trail for compliance assurance, which may often leave the compliance management service free to perform other compliance assurance processes. 
     Accordingly, in one implementation, the compliance management service may obtain information for any resource  114  managed in the information technology infrastructure  110  from the configuration management database  185   a  or other databases  155  that include a federated namespace for the managed resources  114 , configurations for the managed resources  114 , and relationships among the managed resources  114 . In addition, the compliance management service may reference the configuration management database  185   a  or other the databases  155  to arbitrate configuration management in the infrastructure  110  and record previous configurations histories for the resources  114  in the configuration management database  185   a  or other databases  155 . As such, the compliance management service may generally maintain information relating to identities, configurations, and relationships for the managed resources  114 , which may provide a comparison context for analyzing subsequent requests to change the infrastructure  110  and identifying information technology services that the requested changes may impact. 
     Computing and Storage Environments 
     In one implementation, as noted above, the technologies integrated by the model-driven architecture  100 A and the service-oriented architecture  100 B may include managing computing and storage environments that support services in the infrastructure  110 . In particular, in one implementation, the computing and storage environments used to support services in the infrastructure  110  may employ Linux operating environments, which may generally include an operating system distribution with a Linux kernel and various open source packages (e.g., gcc, glibc, etc.) that collectively provide the Linux operating environments. In one implementation, the Linux operating environments may generally provide a partitioned distribution model for managing the computing and storage environments employed in the workload management system. Further, in one implementation, a particular Linux distribution may be bundled for operating environments pre-installed in the workload management system (e.g., openSUSE, SUSE Linux Enterprise, etc.), which may enable vendors of physical hardware resources  114   a  to support every operating system that the vendors&#39; customers employ without overhead that may introduced with multiple pre-installed operating environment choices. 
     In one implementation, the partitioned distribution model may partition the Linux operating environments into a physical hardware distribution (often referred to as a “pDistro”), which may include physical resources  114   a  that run over hardware to provide a physical hosting environment for virtual machines  114   b . For example, in one implementation, the physical hardware distribution may include the Linux kernel and various hypervisor technologies that can run the virtual machines  114   b  over the underlying physical hosting environment, wherein the physical hardware distribution may be certified for existing and future-developed hardware environments to enable the workload management system to support future advances in the Linux kernel and/or hypervisor technologies. Alternatively (or additionally), the workload management system may release the physical hardware distribution in a full Linux distribution version to provide users with the ability to take advantage of future advances in technologies at a faster release cycle. 
     In one implementation, the partitioned distribution model may further partition the Linux operating environments into a virtual software distribution (often referred to as a “vDistro”), which may include virtual machines  114   b  deployed for specific applications or services that run, enable, and otherwise support workloads. More particularly, any particular virtual software distribution may generally include one or more Linux package or pattern deployments, whereby the virtual machines  114   b  may include virtual machines images with “just enough operating system” (JeOS) to support the package or pattern deployments needed to run the applications or services for the workloads. In one implementation, the virtual software distribution may include a particular Linux product (e.g., SUSE Linux Enterprise Server) bundled with hardware agnostic virtual drivers, which may provide configuration resources  114   c  for tuning virtualized resources  114   b  for optimized performance. 
     In one implementation, the particular virtual software distribution may be certified for governmental security requirements and for certain application vendors, which may enable the workload management system to update any physical resources  114   a  in the physical hardware distribution underlying the virtual software distribution without compromising support contracts with such vendors. In particular, in response to future changes in technology that may improve support for Linux operating environments, resulting improvements may occur in techniques for building and deploying Linux operating environments. Thus, where many application vendors currently tend to only provide support for certain Linux applications that run in certain Linux versions, the workload management system may enable support for any particular Linux application or version, which may drive Linux integration and adoption across the information technology infrastructure  110 . In one implementation, for example, the workload management system may employ Linux applications and distributions created using a build system that enables any suitable application to be built and tested on different versions of Linux distributions (e.g., an openSUSE Build Service, SUSE Studio, etc.). For example, in response to receiving a request that includes unique specifications for a particular Linux application, the workload management system may notify distribution developers to include such specifications in the application, with the specifications then being made available to other application developers. 
     Thus, in one implementation, the Linux build system employed in the workload management system may enable distribution engineers and developers to detect whether changes to subsequent application releases conflict with or otherwise break existing applications. In particular, changes in systems, compiler versions, dependent libraries, or other resources  114  may cause errors in the subsequent application releases, wherein commonly employing the Linux build system throughout the workload management system may provide standardized application support. For example, in one implementation, the workload management system may employ certified implementations of the Linux Standard Base (LSB), which may enable independent software vendors (ISVs) to verify compliance, and may further provide various support services that can provide policy-based automated remediation for the Linux operating environments through the LSB Open Cluster Framework (OCF). 
     In one implementation, the Linux operating environments in the workload management system may provide engines that support orchestrated virtualization, collaboration, and architectural agility, as will be described in greater detail below. Further, to manage identities, enforce policies, and assure compliance, the Linux operating environments may include a “syslog” infrastructure that coordinate and manages various internal auditing requirements, while the workload management system may further provide an audit agent to augment the internal auditing capabilities that the “syslog” infrastructure provides (e.g., the audit agent may operate within the event audit service  135   b  to uniformly manage the Linux kernel, the identity services, the policy services, and the compliance services across the workload management system). For example, in one implementation, partitioning the monolithic Linux distribution within a multiple layer model that includes physical hardware distributions and virtual software distributions may enable each layer of the operating system to be developed, delivered, and supported at different schedules. In one implementation, a scheduling system  180   c  may coordinate such development, delivery, and support in a manner that permits dynamic changes to the physical resources  114   a  in the infrastructure  110 , which provide stability and predictability for the infrastructure  110 . 
     In one implementation, partitioning the Linux operating environments into physical hardware distributions and virtual software distributions may further enable the workload management system to run workloads in computing and storage environments that may not necessarily be co-located or directly connected to physical storage, systems that contain persistent data. For example, the workload management system may support various interoperable and standardized protocols that provide communication channels between users, applications, services, and a scalable replicated storage system, such as the clustered file system  195  illustrated in  FIG. 1A , wherein such protocols may provide authorized access between various components at any suitable layer within the storage system. 
     In one implementation, the clustered file system  195  may generally include various block storage devices, each of which may host various different file systems. In one implementation, the workload management system may provide various storage replication and version management services for the clustered file system  195 , wherein the various block storage devices in the clustered file system  195  may be organized in a hierarchical stack, which may enable the workload management system to separate the clustered file system  195  from operating systems and collaborative workloads. As such, the storage replication and version management services may enable applications and storage services to run in cloud computing environments located remotely from client resources  115 . 
     In one implementation, various access protocols may provide communication channels that enable secure physical and logical distributions between subsystem layers in the clustered file system  195  (e.g., a Coherent Remote File System protocol, a Dynamic Storage Technology protocol, which may provide a file system-to-file system protocol that can place a particular file in one of various different file systems based on various policies, or other suitable protocols). Furthermore, traditional protocols for access files from a client resource  115  (e.g., HTTP, NCP, AFP, NFS, etc.) may be written to file system specific interfaces defined in the definitive software library  190 . As such, the definitive software library  190  may provide mappings between authorization and semantic models associated with the access protocols and similar elements of the clustered file system  195 , wherein the mappings may be dynamically modified to handle any new protocols that support cross-device replication, device snapshots, block-level duplication, data transfer, and/or services for managing identities, policies, and compliance. 
     As such, the storage replication and version management services may enable users to create workloads that define identity and policy-based storage requirements, wherein team members identities may be used to dynamically modify the team members and any access rights defined for the team members (e.g., new team members may be added to a “write access” group, users that leave the team may be moved to a “read access” group or removed from the group, policies that enforce higher compliance levels for Sarbanes-Oxley may be added in response to an executive user joining the team, etc.). For example, a user that heads a distributed cross-department team developing a new product may define various members for the team and request permission for self-defined access levels for the team members (e.g., to enable the team members to individually specify a storage amount, redundancy level, and bandwidth to allocate). The workload management system may then provide fine grained access control for a dynamic local storage cache, which may move data stored in the in the clustered file system  195  to a local storage for a client resource  115  that accesses the data (i.e., causing the data to appear local despite being persistently managed in the clustered file system  195  remotely from the client resource  115 ). As such, individual users may then use information technology tools define for local area networks to access and update the data, wherein the replication and version management services may further enable the individual users to capture consistent snapshots that include a state of the data across various e-mail systems, databases  155 , file systems  195 , cloud storage environments, or other storage devices. 
     In one implementation, the storage replication and version management services may further enable active data migration and auditing for migrated data. For example, policies or compliance issues may require data to be maintained for a longer lifecycle than hardware and storage systems, wherein the workload management system may actively migrate certain data to long-term hardware or an immutable vault in the clustered file system  195  to address such policies or compliance issues. Furthermore, identity-based management for the data stored in the clustered file system  195  may enable the workload management system to control, track, and otherwise audit ownership and access to the data, and the workload management system may further classify and tag the data stored in the clustered file system  195  to manage the data stored therein (e.g., the data may be classified and tagged to segregate short-term data from long-term data, maintain frequently used data on faster storage systems, provide a content-addressed mechanism for efficiently searching potentially large amounts of data, etc.). Thus, the workload management system may use the storage replication and version management services to generate detailed reports  145  for the data managed in the clustered file system. 
     In one implementation, the storage replication and version management services may further provide replication services at a file level, which may enable the workload management system to control a location, an identity, and a replication technique (e.g., block-level versus byte-level) for each file in the clustered file system  195 . In addition, the storage replication and version management services may further enable the workload management system to manage storage costs and energy consumption (e.g., by controlling a number of copies created for any particular file, a storage medium used to store such copies, a storage location used to store such copies, etc.). Thus, integrating federated identities managed in the identity vault  125  with federated policy definition services may enable the workload management system to manage the clustered file system  195  without synchronizing or otherwise copying every identity with separate identity stores associated with different storage subsystems. 
     Orchestrated Virtualization 
     In one implementation, as noted above, the technologies integrated by the model-driven architecture  100 A and the service-oriented architecture  100 B may provide orchestrated virtualization for managing services provided in the information technology infrastructure  110 . In particular, virtualization generally ensures that a machine runs at optimal utilization by allowing services to run anywhere, regardless of requirements or limitations that underlying platforms or operating systems may have. Thus, the workload management system may define standardized partitions that control whether certain portions of the operating system execute over hardware provided in a hosting environment, or inside virtual machines  114   b  that decouple applications and services from the hardware on which the virtual machines  114   b  have been deployed. The workload management system may further employ a standardized image for the virtual machines  114   b , provide metadata wrappers for encapsulating the virtual machines  114   b , and provide various tools for managing the virtual machines  114   b  (e.g., “zero residue” management agents that can patch and update running instances of virtual machines  114   b  stored in the clustered file system  195 , databases  155 , or other repositories). 
     In one implementation, the virtualized services provided in the workload management system may simplify processes for developing and deploying applications, which may enable optimal utilization of physical resources  114   a  in the infrastructure. Furthermore, virtualization may be used to certify the Linux operating environments employed in the infrastructure  110  for any suitable platform that include various physical resources  114   a . In particular, as described in further detail above, the workload management system may partition the Linux operating environments into a multiple-layer distribution that includes a physical distribution and a virtual distribution, wherein the physical distribution may represent a lower-level interface to physical resources  114   a  that host virtual machines  114   b , while the virtual distribution may represent any applications or services hosted on the virtual machines  114   b.    
     For example, in one implementation, the physical distribution may include a minimally functional kernel that bundles various base drivers and/or independent hardware vendor drivers matched to the physical resources  114   a  that host the virtual machines  114   b . In one implementation, the physical distribution may further include a pluggable hypervisor that enables multiple operating systems to run concurrently over the hosting physical resources  114   a , a minimal number of software packages that provide core functionality for the physical distribution, and one or more of the zero residue management agents that can manage any virtualized resources  114   b  that may be hosted on the physical resources  114   a . As such, in response to any particular request to install a physical distribution, package selections available to the workload management system may include packages for the kernel, the hypervisor, the appropriate drivers, and the management agents that may be needed to support brands or classes of the underlying physical resources  114   a.    
     Furthermore, in one implementation, the virtual distribution may include a tuned appliance, which may generally encapsulate an operating system and other data that supports a particular application. In addition, the virtual distribution may further include a workload profile encapsulating various profiles for certifying the appliance with attestation tokens (e.g., profiles for resources  114 , applications, service level agreements, inventories, cost, compliance, etc.). Thus, the virtual distribution may be neutral with respect to the physical resources  114   a  included in the physical distribution, wherein the virtual distribution may be managed independently from any physical drivers and applications hosted by a kernel for the virtual distribution (e.g., upgrades for the kernels and physical device drivers used in the physical distributions may be managed independently from security patches or other management for the kernels and applications used in the virtual distributions). Thus, partitioning the physical distributions from the virtual distributions may remove requirements for particular physical resources  114   a  and preserve records for data that may require a specific application running on a specific operating system. 
     In one implementation, from a business perspective, the workload management system may secure the virtualized resources  114   b  in a similar manner as applications deployed on the physical resources  114   a . For example, the workload management system may employ any access controls, packet filtering, or other techniques used to secure the physical resources  114   a  to enforce containment and otherwise secure the virtualized resources  114   b , wherein the virtualized resources  114   b  may preserve benefits provided by running a single application on a single physical server  114   a  while further enabling consolidation and fluid allocation of the physical resources  114   a . Furthermore, the workload management system may include various information technology tools that can be used to determine whether new physical resources  114   a  may be needed to support new services, deploy new virtual machines  114   b , and establish new virtual teams that include various collaborating entities. 
     In one implementation, the information technology tools may include a trending tool that indicate maximum and minimum utilizations for the physical resources  114   a , which may indicate when new physical resources  114   a  may be needed. For example, changes to virtual teams, different types of content, changes in visibility, or other trends for the virtualized resources  114   b  may cause changes in the infrastructure  110 , such as compliance, storage, and fault tolerance obligations, wherein the workload management system may detect such changes and automatically react to intelligently manage that the resources  114  in the infrastructure  110 . In one implementation, the information technology tools may further include a compliance tool providing a compliance envelope for applications running or services provided within any suitable virtual machine  114   b . More particularly, the compliance envelope may save a current state of the virtual machine  114   b  at any suitable time and then push an updated version of the current state to the infrastructure  110 , whereby the workload management system may determine whether the current state of the virtual machine  114   b  complies with any policies that may have been defined for the virtual machine  114   b . For example, the workload management system may support deploying virtual machines  114   b  in demilitarized zones, cloud computing environments, or other data centers that may be remote from the infrastructure  110 , wherein the compliance envelope may provide a security wrapping to safely move such virtual machines  114   b  and ensure that only entities with approved identities can access the virtual machines  114   b.    
     Thus, from an architectural perspective, the virtualized resources  114   b  may enable the workload management system to manage development and deployment for services and applications provisioned in the infrastructure  110 . For example, rather than dynamically provisioning physical resources  114   a  to deal with transient peaks in load and availability on a per-service basis, which may result in under-utilized physical resources  114   a , the workload management system may host multiple virtual machines  114   b  on one physical machine  114   a  to optimize utilization levels for the physical resources  114   a , which may dynamically provisioned physical resources  114   a  that enable mobility for services hosted in the virtual machines  114   b . Thus, in one implementation, mobile services may enable the workload management system to implement live migration for services that planned maintenance events may impact without adversely affecting an availability of such services, while the workload management system may implement clustering or other availability strategies to address unplanned events, such as hardware or software failures. 
     In one implementation, the workload management system may further provide various containers to manage the virtual machines  114   b , wherein the containers may include a security container, an application container, a service level agreement container, or other suitable containers. The security container may generally provide hardware-enforced isolation and protection boundaries for various virtual machines  114   b  hosted on a physical resource  114   a  and the hypervisor hosting the virtual machines  114   b . In one implementation, the hardware-enforced isolation and protection boundaries may be coupled with a closed management domain to provide a secure model for deploying the virtual machines  114   b  (e.g., one or more security labels can be assigned to any particular virtual machine  114   b  to contain viruses or other vulnerabilities within the particular virtual machine  114   b ). Furthermore, in the context of tuned appliances, wherein one virtual machine  114   b  hosts one service that supports one particular application, the application container may package the service within a particular virtual machine image  114   b . As such, the virtual machine image  114   b  may include a kernel and a runtime environment optimally configured and tuned for the hosted service. Similarly, the service level agreement container may dynamically monitor, meter, and allocate resources  114  to provide quality of service guarantees on a per-virtual machine  114   b  basis in a manner transparent to the virtual machine kernel  114   b.    
     In one implementation, the various containers used to manage the virtual machines  114   b  may further provide predictable and custom runtime environments for virtual machines  114   b . In particular, the workload management system may embed prioritization schemes within portions of an operating system stack associated with a virtual machine  114   b  that may adversely impact throughput in the operating system. For example, unbounded priority inversion may arise in response to a low-priority task holding a kernel lock and thereby blocking a high-priority task, resulting in an unbounded latency for the high-priority task. As such, in one implementation, the prioritization schemes may embed a deadline processor scheduler in the hypervisor of the virtual machine  114   b  and build admission control mechanisms into the operating system stack, which may enable the workload management system to distribute loads across different virtual machine  114   b  and support predictable computing. In addition, the workload management system may decompose kernels and operating systems for virtual machines  114   b  to provide custom runtime environments. For example, in the context of a typical virtual machine  114   b , an “unprivileged guest” virtual machine  114   b  may hand off processing to a “helper” virtual machine  114   b  at a device driver level. Thus, to support server-class applications that may depend on having a portable runtime environment, the workload management system may use the decomposed kernels and operating systems to dynamically implement an operating system for a particular virtual machine  114   b  at runtime (e.g., the dynamically implemented operating system may represent a portable runtime that can provide a kernel for a virtual machine  114   b  that hosts a service running a server-class application, which may be customized as a runtime environment specific to that service and application). 
     In one implementation, the workload management system may further employ different virtualization technologies in different operating environments. For example, in one implementation, the workload management system may implement Type 1 hypervisors for virtualized server resources  114   b  and Type 2 hypervisors for virtualized workstation, desktop, or other client resources  115 . In particular, Type 1 hypervisors generally control and virtualize underlying physical resources  114   a  to enable hosting guest operating systems over the physical resources  114   a  (e.g., providing coarse-level scheduling to partition the physical resources  114   a  in a manner that can meet quality of service requirements for each of the guest operating systems hosted on the physical resources  114   a ). Thus, the workload management system may implement Type 1 hypervisors for virtualized server resources  114   b  to leverage performance and fault isolation features that such hypervisors provide. In contrast, Type 2 hypervisors generally include use a host operating system as the hypervisor, which use Linux schedulers to allocate resources  114  to guest operating systems hosted on the hypervisor. In Type 2 hypervisor architectures, such as the VMware GSX Server, Microsoft Virtual PC, and Linux KVM, hosted virtual machines  114   b  appear as a process similar to any other hosted process. Thus, because workstations, desktops, and other client resources  115  may include hardware that may or may not support virtualization, the workload management system may provide centralized desktop management and provisioning using Type 2 hypervisors. For example, the workload management system may manage and maintain desktop environments as virtual appliances  114   b  hosted in the infrastructure  110  and then remotely deliver the desktop environments to remote client resources  115  (e.g., in response to authenticating an end user at a particular client resource  115 , the virtual appliance  114   b  carrying the appropriate desktop environment may be delivered for hosting to the client resource  115 , and the client resource  115  may transfer persistent states for the desktop environment to the infrastructure  110  to ensure that the client resource  115  remains stateless). 
     In one implementation, orchestrated virtualization may generally refer to implementing automated policy-based controls for virtualized services. For example, an orchestrated data center may ensure compliance with quality of service agreements for particular groups of users, applications, or activities that occur in the information technology infrastructure  110 . The workload management system may therefore provide a policy-based orchestration service to manage virtualized resources  114   b , wherein the orchestration service may gather correct workload metrics without compromising performance in cloud computing environments or other emerging service delivery models. For example, workloads that users define may be executed using coordinated sets of virtual machines  114   b  embedding different application-specific operating systems, wherein the workload management system may provision and de-provision the virtual machines  114   b  to meet requirements defined in the workload (e.g., using standard image formats and metadata wrappers to encapsulate the workloads, embed standard hypervisors in the virtual machines  114   b , physical-to-virtual (P2V) or virtual-to-virtual (V2V) conversion tools to translate between different image formats, etc.). Furthermore, in cloud computing environments that can include unpredictable sets of dynamic resources external to the infrastructure  110 , the workload management system coordinate such resources using a closed-loop management infrastructure  170  that manages declarative policies, fine-grained access controls, and orchestrated management and monitoring tools. 
     In one implementation, the workload management system may further manage the orchestrated data center to manage any suitable resources  114  involved in the virtualized workloads, which may span multiple operating systems, applications, and services deployed on various physical resources  114   a  and/or virtualized resources  114   b  (e.g., a physical server  114   a  and/or a virtualized server  114   b ). Thus, the workload management system may balance resources  114  in the information technology infrastructure  110 , which may align management of resources  114  in the orchestrated data center with business needs or other constraints defined in the virtualized workloads (e.g., deploying or tuning the resources  114  to reduce costs, eliminate risks, etc.). For example, as described in further detail above, the configuration management database  185   a  may generally describe every resource  114  in the infrastructure  110 , relationships among the resources  114 , and changes, incidents, problems, known errors, and/or known solutions for managing the resources  114  in the infrastructure  110 . 
     As such, the policy-based orchestration service may provide federated information indexing every asset or other resource  114  in the infrastructure  110 , wherein the workload management system may reference the federated information to automatically implement policy-controlled best practices (e.g., as defined in the Information Technology Infrastructure Library) to manage changes to the infrastructure  110  and the orchestrated data center. For example, the configuration management database  185   a  may model dependencies, capacities, bandwidth constraints, interconnections, and other information for the resources  114  in the infrastructure  110 , which may enable the workload management system to perform impact analysis, “what if” analysis, and other management functions in a policy-controlled manner. Furthermore, as noted above, the configuration management database  185   a  may include a federated model of the infrastructure  110 , wherein the information stored therein may originate from various different sources. Thus, through the federated model, the configuration management database  185   a  may appear as one “virtual” database incorporating information from various sources without introducing overhead otherwise associated with creating one centralized database that potentially includes large amounts of duplicative data. 
     In one implementation, the orchestration service may automate workloads across various physical resources  114   a  and/or virtualized resources  114   b  using policies that match the workloads to suitable resources  114 . For example, deploying an orchestrated virtual machine  114   b  for a requested workload may include identifying a suitable host virtual machine  114   b  that satisfies any constraints defined for the workload (e.g., matching tasks to perform in the workload to resources  114  that can perform such tasks). In response to identifying allocating and deploying the suitable host virtual machine  114   b , deploying the orchestrated virtual machine  114   b  for the workload may include the workload management system positioning an operating system image on the host virtual machine  114   b , defining and running the orchestrated virtual machine  114   b  on the chosen host virtual machine  114   b , and then monitoring, restarting, or moving the virtual machine  114   b  as needed to continually satisfy the workload constraints. 
     In one implementation, the orchestration service may include various orchestration sub-services that collectively enable management over orchestrated workloads. For example, the orchestration service may be driven by a blueprint sub-service that defines related resources  114  provisioned for an orchestrated workload, which the workload management system may manage as a whole service including various different types of resources  114 . Furthermore, a change management sub-service may enable audited negotiation for service change requests, including the manner and timing for committing the change requests (e.g., within an approval workload  130 ). The sub-services may further include an availability management sub-service that can control and restart services in a policy-controlled manner, a performance management sub-service that enforces runtime service level agreements and policies, a patch management sub-service that automatically patches and updates resources  114  in response to static or dynamic constraints, and a capacity management sub-service that can increase or reduce capacities for resources  114  in response to current workloads. 
     To provide exemplary contexts for some of the orchestration sub-services noted above, the availability management sub-service may automatically migrate a virtual machine  114   b  to another physical host  114   a  in response to a service restart failing on a current physical host  114   a  more than a policy-defined threshold number of times. With respect to the performance management sub-service, in response to determining that a service running at eighty percent utilization can be cloned, the service may be cloned to create a new instance of the service and the new instance of the service may be started automatically. Furthermore, to manage a patch for running instances of a service, the patch management sub-service may test the patch against a test instance of the service and subsequently apply the patch to the running service instance in response to the test passing. Regarding the capacity management sub-service, an exemplary service instance may include a service level agreement requiring a certain amount of available storage for the service instance, wherein the capacity management sub-service may allocate additional storage capacity to the service instance in response to determining that the storage capacity currently available to the service instance has fallen below a policy-defined threshold (e.g., twenty percent). 
     In one implementation, the orchestration service may incorporate workflow concepts to manage approval workloads  130  or other management workloads, wherein a workload database  185   b  may store information that the workload management system can use to manage the workloads. For example, in one implementation, an approval workload  130  may include a request to provision a particular service to a particular user in accordance with particular constraints, wherein the approval workload  130  may include a sequence of activities that includes a suitable management entity reviewing the constraints defined for the service, determining whether any applicable policies permit or prohibit provisioning the service for the user, and deploying the service in response to determining that the service can be provisioned, among other things. Thus, the workload engine  180   a  may execute the orchestration service to map the sequence of activities defined for any particular workload to passive management operations and active dynamic orchestration operations. For example, the workload database  185   b  may stores various declarative service blueprints that provide master plans and patterns for automatically generating service instances, physical distribution images and virtual distribution images that can be shared across the workload management system to automatically generate the service instances, and declarative response files that define packages and configuration settings to automatically apply to the service instances. 
     Collaboration 
     In one implementation, as noted above, the technologies integrated by the model-driven architecture  100 A and the service-oriented architecture  100 B may enable collaboration between entities that interact with the services provided in the information technology infrastructure  110 . In particular, collaboration may generally involve dynamic teams that cross traditional security and policy boundaries. For example, where loosely affiliated organizations share data and applications, the workload management system may enable continued collaboration even when some of the participants sharing the data and applications may be temporarily offline (e.g., the workload management system may authorize certain users to allocate portions of local client resources  115  to support cross-organizational endeavors). Thus, the workload management system may provide a standard interface  160  designed to enable dynamic collaboration for end users that simplify interaction with complex systems, which may provide organizations with opportunities for more productive and agile workloads. 
     In one implementation, the workload management system may provide a collaboration service that enables workloads to span multiple users, applications, services, systems, or other resources  114 . For example, multiple users may collaborate and share data and other resources  114  throughout the workload management system, both individually and within virtual teams (e.g., via a service bus that transports data relating to services or other resources  114  over the event bus  140 ). As such, the workload management system may support virtual team creation that can span organizational and geographic boundaries, wherein affiliations, content, status, and effectiveness may be represented for identities that have membership in any particular virtual team (e.g., to enable online and offline interaction between team members). In one implementation, the workload management system may provide enriched collaboration content (e.g., images, video, text, data feeds), and may efficiently transport the collaboration content between team members (e.g., via the service bus). Furthermore, the workload management system may integrate desktops, laptops, personal digital assistants, smart phones, or other suitable client resources  115  into virtual team collaboration experiences in order to meet emerging demands for mobile, interoperable, and integrated access. Thus, the collaboration enabled in the workload management system may operate in an adaptive collaborative environment, which may unify technologies for online integrated media sharing with offline authoring and editing. 
     In one implementation, the collaboration service may generally include a web-based platform that support inter-organization and intra-organization management for virtual teams, interoperability between various different collaboration products, social networking to deliver information that enables the virtual teams to interact efficiently either online or offline, and federated searches against any suitable information source, among other things. For example, in one implementation, the collaboration service may include various collaboration sub-services that collectively enable the adaptive collaborative environment, including a client sub-service, an aggregation sub-service, an information sub-service, a real-time collaboration sub-service, and a metadata sub-service. 
     In one implementation, the client sub-service may provide communication interfaces with real-time online systems, offline systems, and user interfaces. In particular, functionality for the client sub-service may be provided in a web-based interface that supports interaction with the real-time online systems in addition to software that can execute locally at client resources  115  to provide offline access to shared data and real-time meetings that may involve shared applications and shared desktops. For example, in one implementation, the client sub-service may communicate with the aggregation sub-service to coordinate the communication and collaboration across various information sources, wherein the aggregation sub-service may route messages to the appropriate information sources in appropriate formats. Furthermore, to ensure that collaborative contexts reference information that may be distributed across the infrastructure  110  rather than hosted within one particular application, the information sub-service may integrate the different information sources within the collaborative environment. As such, the virtual teams may connect and collaborate using information that originates anywhere across the infrastructure  110 , and the information sub-service may enable members of the virtual teams to discuss information or other content from the various sources in an interactive manner. The real-time collaboration sub-service may interact with the information sub-service to provide real-time meetings that include audio content, video content, instant message content, and other forms of communication content in real-time collaborative contexts within the infrastructure  110  and with third-parties. 
     In one implementation, the metadata sub-service may provide a “helper” service to the aggregation and information sub-services, collecting ancillary metadata generated during interaction between virtual team members and create collaborative threads to maintain contexts that generated the data. Furthermore, the metadata sub-service may evaluate the ancillary metadata to discover new and relevant links between information sources and integrate data that can potentially originate from various disparate information sources. For example, the metadata sub-service may provide a uniform format for classifying data collected during collaborative contexts, which may provide a single source for virtual team members to search and display the data across any suitable collaboration source. Similarly, the metadata sub-service may index and unify data collected from disparate network sources, including various search engines and content aggregation services, to help the virtual team members to locate information that may be interesting or otherwise relevant to the collaborative contexts. As such, the various sub-services integrated within the collaboration service may provide a collaborative environment that supports dynamic interaction across organizational boundaries and different information sources in a manner that can account for any particular virtual team member&#39;s personal preferences. 
     Architectural Agility 
     In one implementation, as noted above, the technologies integrated by the model-driven architecture  100 A and the service-oriented architecture  100 B may collectively provide various services that the workload management system can use to manage workloads and enable intelligent choices in an information technology infrastructure  110 . Furthermore, various horizontal integration components may be distributed in the workload management system to integrate the various technologies employed in the model-driven architecture  100 A and the service-oriented architecture  100 B and provide an agile and interoperable information technology infrastructure  110 . 
     In particular, the horizontal integration components distributed across the workload management system may provide agility and interoperability to the information technology infrastructure  110  through support for various emerging service delivery models, including Web 2.0, Software as a Service (SaaS), mashups, hardware, software, and virtual appliances, cloud computing, grid computing, and thin clients, among others. For example, in one implementation, every service, application, or other resource  114  in the workload management system may be provided with an application programming interface  160  that can provide connectivity between different operating systems, programming languages, graphical user interface toolkits, or other suitable services, applications, or resources  114 . 
     In one implementation, the application programming interface  160  may include a Representational State Transfer (REST) application program interface  160 , which may use standard methods defined in the Hypertext Transfer Protocol (HTTP), wherein using standardized types to format data may ensure interoperability. In one implementation, the REST interface  160  may define a Uniform Resource Identifier (URI) that represents a unique identity for any suitable entity, and may further define relationships between the represented identities with hyperlinks that can be selected to access information for related identities, attribute claims, roles, policies, workloads, collaboration spaces, and workflow processes. Thus, through the use of URIs, hyperlinks, and other standard HTTP methods, the REST interface  160  may provide an interface to a data ecosystem that can be navigated in a web-based environment that can be used anywhere in the workload management system. In one implementation, the REST interface  160  may declare a namespace having version controls and standard methods to read and write to the data ecosystem, and may include a URI registry containing the URIs that represent the identities in the data ecosystem. Thus, any suitable resource  114  may programmatically discover other identities that communicate using the REST interface  160  (e.g., the REST interface  160  may be implemented in a communication gateway  112   a  to physical resources  114   a , a communication gateway  112   b  to virtualized resources  114   a , a communication gateway  112   c  to configuration resources  114   c , etc.). 
     Furthermore, in one implementation, the workload management system may extend an application program interface stack for the supplied REST interface  160 , which may enable new services, applications, and other resources  114  to be integrated into the workload management system in a manner that automatically inherits the identity-based and policy-controlled services implemented in the workload management system. In particular, the supplied application program interface stack may generally include a unified adapter and a proxy to existing and future technologies using protocols to enable services that communicate through the REST interface  160  regardless of whether the services reside in the infrastructure  110 , a cloud computing environment, a third party data center, or elsewhere (e.g., web service protocols, lightweight directory protocols, messaging queue protocols, remote procedure call protocols, etc.). To provide support to developers and users that extend the application program interface stack supplied for the REST interface  160 , a Recipe-based Development Kit (RDK) may provide full source code examples for various operating systems, programming languages, and graphical user interface toolkits. 
     Additionally, in one implementation, the workload engine  180   a  may manage creation of application program interface keys for the REST interface  160  stack, whereby auditing and policy-based approvals may be supported for provisioning the application program interface keys. For example, the workload management system may deploy widgets to client desktops  115 , wherein the widget may track identities and contexts that include attempts to access the REST interface  160  stack. Thus, in response to provisioning or auditing application program interface keys, platform authentication and policy checks may be triggered against the accessing identity and the context that the keys supply. In a similar manner, the application program interface keys may enable the workload management system to meter costs for the information technology infrastructure  110 . 
     Thus, the standardized stack supplied for the REST application program interface  160  may provide support for industry standard authentication and authorization methods, which may enable identity-managed and policy-controlled auditing for events and access controls. Furthermore, the extensibility of the REST application program interface  160  may enable integration with any suitable existing or future-developed system. For example, in one implementation, the REST interface  160  may be configured with standards such as the Atom Syndication Format and Atom Publishing Protocol to integrate feed synchronization, JavaScript Object Notation and Extensible Markup Language (XML) to integrate enterprise portals, mashups, and social networking platforms. Thus, in the context of feed synchronization to provide automatically notifications in response to any changes to a particular resource  114 , a user may simply enter a URI for the resource  114  in an existing web browser feed aggregator (e.g., Firefox bookmarks). Thus, by providing extensible support for any suitable system, application, service, or other resources  114 , the features of the REST application program interface  160  may provide agility and interoperability to the infrastructure  110 . 
     Having described the model-driven and service-oriented architecture  100 A-B that collectively provide the agile, responsive, reliable, and interoperable environment that enables the features of the workload management system, the description to be provided below will address certain particular features of the workload management system. In addition, further detail relating to the architectural foundation and other features of the workload management system may be provided in “Novell Architectural Foundation: A Technical Vision for Computing and Collaborating with Agility,” “Automation for the New Data Center,” and “A Blueprint for Better Management from the Desktop to the Data Center,” the contents of which are hereby incorporated by reference in their entirety. 
     According to one aspect of the invention,  FIG. 2  illustrates an exemplary method  200  for intelligent workload management. In particular, the intelligent workload management method  200  may be used to manage approval workloads created in response to service requests. In particular, an operation  210  may include creating an approval workload in response to a receiving a request for a service from any suitable user, application, system, or other entity having an identity in the workload management system. For example, in one implementation, the request may generally specify any components needed to configure the service for a particular task (e.g., a raw machine hosting an operating system and storage may be requested to deploy a particular application in the raw machine, an existing service may be requested to specify any suitable combination of components that can deploy the application, etc.). In addition, the request may further specify desired a performance level (or service level) for the service (e.g., availability, release capacity, financial constraints, continuity, etc.), any comments for provisioning the service in a certain manner (e.g., provision the service as soon as possible, according to a particular schedule or policy, to particular members in a virtual team, with a particular configuration, etc.). 
     Thus, in one implementation, the request may generally include any suitable criteria that the requesting entity specifies to define constraints for deploying the requested service, wherein the workload management system may create the approval workload in operation  210  to determine whether or not the requested service can be provisioned in a manner that meets the constraints defined in the request. For example, in one implementation, the approval workload may generally define a task that includes various human and/or automated approvers (or service delivery managers) collaboratively managing the service request to determine whether the service can be provisioned as requested. Thus, to manage the approval workload, an operation  220  may include the workload management system querying a configuration management database to obtain an infrastructure model describing any computing resources and storage resources available to run the requested service. 
     In one implementation, the model of the computing resources obtained in operation  220  may include various rack-mounted servers and/or blade servers, which may include multi-core processors (e.g., sixty-four bit processors), a multiple gigabyte local memory, a serial-attached Redundant Array of Independent Disks (RAID), Ethernet and Storage Area Network (SAN) interfaces, and embedded hardware that can support virtualization. In addition, the computing resources may further run an appropriate operating system for the underlying physical architecture, including a virtual machine monitor (e.g., a hypervisor), various device drivers, a management kernel, and any suitable management agents. In one implementation, the management kernel and the management agents may collectively provide support for remotely deploying virtual machines to be executed by the hypervisors present on the computing resources, which may enable the workload management system to group and organize the computing resources. For example, a globally unique identifier (e.g., a URI) may be created for each of the computing resources, whereby the computing resources may be grouped or otherwise organized according to any suitable combination of a type (e.g., thin blade, symmetric multiprocessing, etc.), intended purpose (e.g., test, production, etc.), owner, physical location, or other classifying types. Furthermore, the workload management system may configure one or more of the computing resources to function in isolation or cooperatively with other computing resources to create high-availability clusters. 
     In one implementation, the model of the storage resources obtained in operation  220  may include various SAN disk-block storage arrays and/or file servers, whereby the storage resources may be collectively pooled and protected with identity-based policy controls. In one implementation, the computing resources described above may access the storage resources on behalf of virtual machines deployed in the infrastructure, wherein the storage resources may be individually managed during lifecycles of the virtual machines in a dynamic manner. Furthermore, the workload management system may group and organize the storage-resources in a similar manner as the computing resources, wherein the workload management system may manage the storage resources according to any suitable combination of a type (e.g., available RAID-5 disks), intended purpose (e.g., temporary, protected, remotely replicated, etc.), owner, physical location, or other classifying types. 
     In one implementation, the model of the computing resources and the storage resources obtained in operation  220  may further include various relationships between the resources, wherein the relationships may include dependencies, capacities, and bandwidth requirements. For example, any particular virtual machine deployed in the infrastructure may generally run on physical computing resources, wherein the model may include federated information that links a network address, identities, and other information for the virtual machine with any computing resources and storage resources that have been allocated to the virtual machine, which may enable lifecycle management for the virtual machine. Thus, the configuration management database may generally provide federated knowledge detailing any suitable entity managed in the workload management system and relationships between such managed entities. 
     In one implementation, in response to querying the configuration management database in operation  220  to obtain the current model of the infrastructure, an operation  225  may determine whether the workload management system can provision the service requested in the approval workload in a manner that meets any constraints that the request defined for the service. In particular, the workload management system may determine whether the infrastructure model indicates that the infrastructure has available computing resources and storage resources suitable to provision the requested service. Furthermore, the workload management system may employ the identity management and policy enforcement services to determine whether the service can be provisioned to the requesting entity without violating any relevant policies. For example, to authenticate and configure a desktop machine for a chief financial officer, a biometric authorization component (e.g., a fingerprint reader) may be installed in the desktop machine. Thus, the identity management and policy enforcement services may collectively prohibit the workload management system from deploying services to the desktop machine that would add a keystroke logger, remove the biometric authorization component, or violate another policy with respect to the chief financial officer identity. In another example, requests for Bit Torrent storage may be denied regardless of an identity for the requesting identity because a policy prohibits peer-to-peer file sharing. 
     Thus, in response to the workload management system determining in operation  225  that the requested service cannot be provisioned in accordance with the constraints defined in the request (e.g., because the infrastructure lacks sufficient computing resources and/or storage resources to support the service, the requested service violates a relevant policy with respect to an identity for the requesting entity, etc.), the workload management system may deny the request and send an appropriate denial notification to the requesting entity in an operation  230 . For example, the denial notification may provide a reason for denying the service request, which may provide information that can be referenced to analyze subsequent requests having similar criteria, modify the request based on available resources or relevant policies, audit approval processes in a compliance review, or otherwise referenced. 
     On the other hand, in response to determining in operation  225  that the requested service can be provisioned in accordance with the requested constraints (e.g., because the infrastructure has sufficient computing resources and storage resources to support the service, the requested service does not violate any policies with respect to the identity for the requesting entity, etc.), the workload management system may approve the request and then initiate provisioning for the service in an operation  235 . In particular, in response to approving the request, the workload management system may reserve appropriate physical computing resources, virtual computing resources, and/or storage resources to run the service, wherein operation  235  may include determining whether such resources can be automatically and/or immediately allocated. For example, certain workloads may be prioritized to ensure that business objectives can be met, wherein the workload management system may defer the approval workload in operation  235  in response to determining that allocating the resources to the approval workload may occupy resources needed for higher priority workloads (e.g., because the reserved resources are currently subject to a “blackout” period for patching or updating the resources). 
     As such, in response to determining that the resources reserved to the service cannot be provisioned automatically and/or immediately, the workload management system may manage creation of a provisioning plan for the service in an operation  240 . In particular, operation  240  may include various automated and/or human entities interacting to create the provisioning plan, wherein the provisioning plan may include pre-empting the approval workload until workloads in a high priority queue have completed, moving the approval workload to the high priority queue, dynamically allocating additional resources to the approval workload (e.g., pre-empting lower priority workloads), or otherwise balancing utilization of the resources in the infrastructure between business processes and system processes that may have different priorities. Furthermore, in one implementation, the workload management system may coordinate the interaction between the entities that create the provisioning plan in operation  240  (e.g., because the service cannot be provisioned until a certain process has completed, a certain entity provides feedback, etc.). As such, operation  240  may generally include various processes and interactions between entities, which the workload management system may manage to create the plan for suitably provisioning the approved service. 
     In one implementation, in response to determining that the resources reserved to the service can be provisioned automatically and immediately, or alternatively in response to successfully creating the provisioning plan for the service in operation  240 , the workload management system may provision the requested service in an operation  250 . In particular, operation  250  may include allocating an operating system image, a resource inventory, and software to an orchestrated virtual machine that can run the service and embedding lifecycle control information within the orchestrated virtual machine to enable management for the virtual machine and the computing resources allocated to the service. In one implementation, one or more of the computing resources in the infrastructure may be configured as an image creation server, wherein the image creation servers may be dedicated to creating and installing virtual machines in various ways. For example, in a large information technology infrastructure that frequently creates virtual machine instances, multiple image creation servers may be employed to create and install the virtual machines, or one or more of the image creation servers may be configured to create “in-place” virtual machines, wherein such virtual machines may be incubated on particular computing resources that further execute the virtual machines. 
     Thus, in one implementation, operation  250  may include invoking an image creation service, which may create a virtual machine image to run the requested service. For example, the image creation service may contact an image repository that contains various ready-to-run virtual machine images and then appropriately download one or more of the virtual machine images that can run the requested service. The image creation service may then clone and configure the virtual machine image downloaded from the image repository based on any constraints that the request defines for the service. As such, operation  250  may generally include creating a new virtual machine having an operating system image, external storage references, and control information particularly configured for the requested service (e.g., based on identities, policies, service level agreements, lifecycle management, etc.), and may further include deploying the newly created virtual machine to computing resources that have been reserved to run the requested service. Alternatively (or additionally), the image creation service may provide a push model for deploying the virtual machine image, wherein the image creation service may instruct the image repository to multi-cast the image to multiple computing resources. Thus, the push model implementation may pre-stage the multi-casted virtual machine image for deployment over various potential deployment targets. 
     In one implementation, in response to successfully provisioning the service in operation  250 , the workload management system may update the infrastructure model in an operation  260 . For example, any resources, identities, policies, or other information associated with the provisioned service, may be indexed within a global namespace in the federated configuration management database. As such, the workload management system may reference the updated infrastructure model to track registered virtual machines that have been provisioned and deployed in the infrastructure, hierarchical relationships between the registered virtual machines and the resources, identities, policies, or other information associated with the virtual machines, and otherwise provide lifecycle management for the virtual machines, as will be described in greater detail below. Furthermore, an operation  270  may include the workload management system sending a service provisioning notification to the requesting entity, wherein the notification sent in operation  270  may indicate that the service has been successfully provisioned, provide information that can be referenced to analyze subsequent requests having similar criteria, audit approval processes in a compliance review, or otherwise provide information relevant to the provisioned service. 
     In one implementation, the workload management system may manage the provisioned service in an operation  280  in response to successfully provisioning the service in operation  250 . In particular, as noted above, updating the infrastructure model in operation  260  may provide information that the workload management system can reference to provide lifecycle management for services provisioned and deployed in the infrastructure. For example, various lifecycle rules and control information may be used to respond to variable computing demands, changes, and unexpected events in the infrastructure, wherein services that run within virtual machines may introspectively monitor and report on health of the hosted services. Thus, the provisioned service may be managed in operation  280  with the lifecycle control information embedded in the host virtual machines (e.g., monitoring real-time execution states and other health conditions, automatically managing identities and policies in response to monitored health conditions, retiring resources reserved or allocated the virtual machine that may no longer be needed, etc.). 
     In addition, the workload management system may cooperate with the lifecycle controls embedded in the host virtual machines to manage the provisioned service. In particular, the workload management system may aggregate information relating to the monitored states reported from individual virtual machine instances and record such information within a context describing a current state of the infrastructure model. Thus, physical constraints, dependencies, current performance trends, and other real-time execution states may be monitored to schedule virtual machines that run provisioned services to computing resources for execution in a manner that satisfies any identity constraints, policy controls, service level agreements, or other constraints that have been defined for the services. For example, operation  280  may include applying policy-defined thresholds to any status events generated by the monitored computing resources, storage resources, virtual machines, or other resources (e.g., responding to a monitored variable that exceeds or falls below a policy-defined threshold for more than a policy-defined time period). In another example, operation  280  may further include managing version controls for virtual machine images, which may provide support for inserting management agents that can tune or patch the virtual machine images as needed, and rolling the virtual machine images back to a “pristine” state, among other things. 
     Thus, the techniques described above the intelligent workload management method  200  may generally provide lifecycle management from creating a virtual machine image that can host a requested service through eventual retirement of the virtual machine image. Moreover, in addition to introspective health monitoring and maintenance for individual virtual machine images, the lifecycle management techniques may provide federated information for managing an entire information technology infrastructure, which may be used to assure compliance with legal and contractual obligations for any suitable hardware or software that an organization may use, create detailed plans for implementing or rolling back proposed changes to the infrastructure, detect, resolve, and otherwise remediate incidents in the infrastructure, reactively and proactively manage problems in the infrastructure with known workarounds, fixes, and permanent infrastructure changes, and ensure that every service in the infrastructure meets or exceeds service level requirements, among other things. 
     According to one aspect of the invention,  FIG. 3  illustrates an exemplary block diagram of a system  300  for generating single sign-on workload identities, while  FIG. 4  illustrates an exemplary flow diagram of a method  400  that may operate in the system  300  for generating single sign-on workload identities. Thus, the description to be provided herein for  FIG. 3  or  FIG. 4  will be understood as corresponding to techniques that can be performed in the system  300  shown in  FIG. 3  or the method  400  shown in  FIG. 4 , whether or not explicitly described. 
     In one implementation, generating single sign-on workload identities may generally include creating an authentication token, that defines various credentials or permissions assigned to any suitable user, application, system, service, resource, or other entity having an identity managed in the workload management system. More particularly, an operating system that executes services or other applications on a client device  315  may generally maintain various authentication credentials, for any identities managed locally to the operating system, or the operating system may contact an authentication server  320  to obtain authentication credentials for any single sign-on identities that the operating system does not locally manage. In one implementation, the authentication server  320  may therefore provide a single sign-on identity source that contains authentication credentials for every managed entity, wherein single sign-on identity management may be provided for any suitable workload managed in the workload management system. 
     For example, in one implementation, the system and method for generating single sign-on workload identities may be used to generate single sign-on authentication tokens, wherein a workload engine  380  may reference the single sign-on authentication tokens to provide identity management for any suitable service request (e.g., to verify that an entity that requests a new service has proper authorization prior to actually provisioning the new service, to verify that an entity that requests access to an existing service has proper authorization prior to granting access to the service, etc.). For example, in one implementation, the authentication server  320  (e.g., Novell Access Manager) may communicate with an identity vault  325  that organizes user accounts, roles, policies, and other identity information within various directories. Thus, as shown by communication element  1  in  FIG. 3  (or operation  410  in  FIG. 4 ), any suitable entity may submit an authentication request to the authentication server  320 , wherein the authentication request may include single sign-on authentication credentials (e.g., a user name, identifier, password, smart card input, biometric input, etc.). 
     In one implementation, communication element  2  may then include the authentication server retrieving the authentication credentials for the requesting entity from the federated identity information stored in the identity vault  325 . In an operation  420  (and communication element  3 ), the authentication server may then generate an authentication token for the requesting entity from the authentication credentials retrieved from the identity vault  325 , wherein the authentication token may represent a portable data abstraction that encapsulates any authoritative attribute, active role, valid policy, or other access credential for the entity associated with the authorization token. As such, the authorization token may mask any underlying credential authentication, identity federation, and attribute attestation, wherein the authorization token may be referenced to obtain authoritative statements that indicate whether to authorize or deny any suitable request received from the entity associated with the authorization token. Furthermore, as shown by communication element  4  in  FIG. 3 , the authentication token may be returned to the client device  315  that originated the request, whereby any operating systems, applications, services or other resources on the client device  315  that require authentication credentials may use the authentication token to authenticate or deny local requests received from the entity associated with the authorization token. 
     In one implementation, the workload management system may include a workload engine  380  that can use authentication tokens generated by the authentication server  320  to manage workloads that include service requests. Furthermore, the workload engine  380  may use authentication tokens for various entities that may be represented in multiple different authentication domains, which may enable workloads to function across different organizational boundaries. In particular, an operation  430  (or communication element  5 ) may include receiving a workload that defines a particular service requested by the entity operating the client device  315 , wherein the entity may specify various additional entities that may need access to the requested service. As such, an operation  440  (or communication element  6 ) may include the workload engine  380  managing the workload to obtain authentication tokens for the requesting entity in addition to authentication tokens for any additional entities specified in the request. Furthermore, as noted above, the entities managed in the workload management system may define various types of customized identities, such that the authentication tokens obtained in operation  440  (and communication element  6 ) may represent authentication credentials for any suitable combination of identities that represent the requesting entity and/or the various additional entities (e.g., identities providing limited or complete anonymity, aggregated roles across various federated authentication domains, rights delegated to and/or by other identities, relative roles with respect to other identities, etc.). 
     In one implementation, an operation  450  may then include the workload engine  380  analyzing the authentication tokens obtained from the authentication server  320  to identify any authentication credentials that the authentication tokens represent. As such, the workload engine  380  may reference the identified authentication credentials in an operation  460  to determine whether the identities for the requesting entity (and/or the additional entities) have proper authorization for the requested service. The workload engine  380  may then generate an authentication determination for the workload using the authentication tokens that include federated identity information for the relevant identities in addition to any policies that may be relevant to any identities involved in the workload (e.g., the client machine  315 , other services or applications running on the client machine  315 , or any other suitable identity involved in a session associated with the workload, as described in further detail above). Thus, in response to determining that the authentication tokens obtained from the authentication server  320  indicate that one or more of the identities involved in the workload lack proper authorization, an operation  470  (or communication element  7 ) may include the workload engine  380  notifying the requesting entity that the service request has been denied. Alternatively, in response to determining that every identity involved in the workload has proper authorization, an operation  480  (or communication element  7 ) may include notifying the requesting entity that the service request has been approved and subsequently provisioning the requested service. 
     Moreover, in response to approving the service request in operation  460 , operation  480  may further include embedding the authentication tokens obtained in operation  440  (and communication element  6 ) within an image created for the approved service. In particular, as described in further detail above, any particular workload may include a request to provision a new service, a request to update identities managed in an existing service, or a another suitable request to manage identities associated with the approved service request. Thus, in one implementation, operation  480  may further include the workload engine  380  embedding the authentication tokens within one or more virtual machine images that host the service, whereby any suitable identity associated with the virtual machine images may be managed with the single sign-on authentication tokens obtained from the authentication server  380 . For example, to configure a service newly provisioned to a virtual team having various members, authentication tokens for the various team members may be embedded into a virtual machine image that an image creation system creates to host the new service. Similarly, authentication tokens for new members of the team may be embedded within the service image to grant the new members access to the service image, while authentication tokens for any members that leave the team may be removed from the service image to prevent former members of the team from continuing to have access to the service image. In another example, in response to determining that a subset of the team members have proper authorization credentials for the service and that other team members lack proper authorization credentials, the tokens embedded within the image may be limited to the subset having proper credentials, or the workload management system may determine whether members lacking proper credentials have other managed identities with the proper credentials and insert tokens within the image that correspond to the other managed identities. 
     Thus, as described in further detail above with reference to  FIG. 1A-B , authentication tokens generated at the single sign-on authentication server  380  may be used in various ways to pre-configure or re-configure a virtual machine with embedded authentication credentials for identities managed in the virtual machine. Moreover, any suitable resource in the workload management system may reference the authentication tokens embedded within the virtual machine to manage the identities associated with the virtual machine, whereby the single sign-on authentication tokens may generally provide a portable data abstraction to run identity management services anywhere in the workload management system. 
     According to one aspect of the invention,  FIG. 5A  illustrates a block diagram of an exemplary service distribution  500 A that can be managed with one or more zero residue management agents  580  in the workload management system, while  FIG. 5B  illustrates an exemplary lifecycle  500 B for the service distribution  500 A managed with the zero residue management agents  580 . In particular, as shown in  FIG. 5A , the workload management system may use various orchestrated virtualization services to create and manage a partitioned operating environment for the service distribution  500 A, wherein the operating environment may be partitioned into a physical distribution layer and a virtual distribution layer. In one implementation, the physical distribution layer and the virtual distribution layer may collectively define a standard partition model for the service distribution  500 A, which may provide control over whether to execute certain portions of the service distribution  500 A over physical hardware in a hosting environment or within virtual machines that abstract any physical hardware that hosts the virtual machines. As such, the standard partition model may permit the service distribution  500 A to run anywhere in an infrastructure, regardless of any requirements or limitations associated with underlying hardware or software platforms, which may enable optimal utilization for the service distribution  500 A. 
     In one implementation, the physical distribution layer in the service distribution  500 A may provide an interface to physical hardware resources that host components in the virtual distribution layer. For example, the physical distribution layer may include a minimal functional kernel  550  that bundles various hardware drivers matched to the physical hardware that hosts the components in the virtual distribution layer (e.g., local area network drivers, independent hardware vendor drivers, variable drivers that support certain hardware platforms, etc.). In one implementation, the physical distribution layer may further include a pluggable hypervisor  560 , which may enable the service distribution  500 A to concurrently run various different operating systems  520  over the hosting physical hardware, and minimal core packages  570  that provide software supporting functionality for the components in the physical distribution layer. In addition, as will be described in further detail below, the physical distribution layer may further include an injection point  580  for dynamically inserting and removing one or more zero residue management agents that can manage the lifecycle  500 B for the service distribution  500 A. 
     In one implementation, the virtual distribution layer in the service distribution  500 A may provide a tuned appliance, which the physical distribution layer executes over any underlying physical hardware that hosts the service distribution  500 A. In particular, the virtual distribution layer may include a storage pointer  510  that identifies one or more local or remote storage locations allocated to contain a persistent state for the service distribution  500 A (e.g., within a clustered file system organized with storage replication and version management services), in addition to an operating system  520  that includes a minimal number of packages, patterns, or other software components needed to support any applications  530  in the tuned appliance (e.g., the operating system  520  may include “just enough operating system” (JeOS)  520  to support the applications  530  provided in the service distribution  500 A). In addition, the virtual distribution layer may include one or more configurations  540  that can be used to configure the storage pointer  510 , the operating system  520 , and/or the applications  530  in the virtual distribution layer, wherein the configurations  540  may define a workload profile for the service distribution  500 A. For example, the workload profile may include various bundled virtual drivers for tuning components in the virtual distribution layer, attestation tokens defining unique identities and authentication credentials for the components in the virtual distribution layer, a service level declaration that defines any memory, processing, availability, disaster recovery, or other deployment constraints for the service distribution  500 A. 
     Thus, the components in the virtual distribution layer may be neutral with respect to the components in the physical distribution layer, which may enable the zero residue managements  580  to independently manage any of the components in the virtual or physical distribution layers. In particular, the workload management system may employ one or more standard formats to create images for the physical distribution layer and/or the virtual distribution layer and encapsulate the physical distribution image and/or the virtual distribution image within one or more metadata wrappers. As such, the zero residue management agents  580  may be dynamically deployed within the service distribution  500 A to manage various different modes during the lifecycle  500 B of the service distribution  500 A. For example, in response to initially creating the service distribution  500 A, the lifecycle  500 B of the service distribution  500 A may enter the creation mode, wherein a creation management agent  580  may execute a bootstrap process to advertise that the service distribution  500 A exists and appropriately download any additional management agents  580  to manage the different modes of the lifecycle  500 B for the service distribution  500 A. 
     For example, in one implementation, in response to the lifecycle  500 B changing from one mode to another (e.g., from the creation mode through a release mode, a production mode, a test mode, a maintenance mode, an optional re-release mode, and an eventual retirement mode), one or more of the management agents  580  may be identified based on a current mode in the lifecycle  500 B and dynamically inserted into the service distribution  500 A. In another example, authentication tokens generated using the techniques shown in  FIGS. 3 and 4  and described above may be embedded within the service distribution  500 A, wherein the relevant management agents  580  may be identified based on the embedded authentication tokens (e.g., in response to a trouble ticket request from a user that describes a problem with a particular service distribution  500 A that the user interacts with, the particular service distribution  500 A may be located by searching for an service distributions  500 A having an embedded authentication token associated with the user, and an appropriate management agent  580  may then be deployed to the particular service distribution  500 A having the embedded authentication token to diagnose or otherwise provide assistance in resolving the problem with the distribution  500 A). 
     In one implementation, the identified management agent  580  may then perform any management tasks associated with the current lifecycle mode, and in response to completing the management tasks, the management agent  580  may then be removed from the service distribution  500 A. In one implementation, removing the management agent  580  from the service distribution  500 A may generally include removing any runtime state associated with the management agent  580  and rolling back any changes that the management agent  580  applied to the service distribution  500 A in order to perform the management tasks. For example, a test management agent  580  that executes during the test mode may disable a YaST configuration tool  540  that otherwise controls installation and system management for the virtual distribution layer operating environment, whereby rolling back the changes applied to the service distribution  500 A may include re-enabling the YaST configuration tool in response to the test management agent  580  completing the management tasks for the test mode. In another example, a patch management agent  580  may be inserted into the service distribution  500 A to patch or otherwise update any suitable component in the service distribution  500 A during the maintenance mode, wherein runtime states and temporary changes applied by the patch management agent  580  may be removed from the service distribution  500 A with the patch management agent  580  in response to the maintenance mode completing. 
     Thus, removing the runtime state associated with the management agents  580  and any temporary changes that the management agents  580  applies to the service distribution  500 A during the various lifecycle modes may ensure that the service distribution  500 A has been restored to a “golden” or “pristine” state prior to entering a next lifecycle mode. In particular, the zero residue management agents  580  may be dynamically inserted into the service distribution  500 A to execute appropriate management tasks for a current lifecycle mode, and then appropriately removed in a manner that leaves the service distribution  500 A unmodified except for any persistent changes that the management tasks apply to the service distribution  500 A. For example, during the maintenance mode, a configuration management agent  580  may be inserted into the service distribution  500 A to modify the storage pointer  510  to point to a new local or remote storage location in response to an original storage location allocated to the service distribution  500 A failing or running short on available storage resources, whereby the service distribution  500 A may be unchanged except for the modified storage pointer  510 . In another example, a tuning management agent  580  may be similarly inserted into the service distribution  500 A during the maintenance mode to independently apply any upgrades or other modifications that can tune functionality for the service distribution  500 A (e.g., the tuning management agent  580  may upgrade the kernel  550  and device drivers in the physical distribution layer independently from security patches applied to the operating system  520  or applications  530  in the virtual distribution layer, and in response to completing the upgrades, the service distribution  500 A may optionally be re-released to ensure that subsequent versions of the service distribution  500 A automatically include the upgrades to the kernel  550  and device drivers and the patches applied to the operating system  520  or applications  530 ). 
     In one implementation, one or more policies may define the management agents  580  inserted into the service distribution  500 A during the various modes of the lifecycle  500 B. For example, a required service level defined in the workload profile  540  may define a recipe for one or more of the management agents  580  to inject into the service distribution  500 A to ensure that the service distribution  500 A meets or exceeds the required service level (e.g., a configuration management agent  580  may modify the storage pointer  510  to ensure the service distribution  500 A has sufficient storage capacity, a tuning management agent  580  may modify the hypervisor  560  to prepare the service distribution  500 A for migration to different physical host resources that provide greater availability or performance, etc.). In other examples, the recipe for the management agents  580  may be determined automatically (e.g., based on the current mode), based on the applications  530  hosted in the service distribution  500 A and any management that may be needed for such applications  530 , or other suitable criteria. Further, in one implementation, one or more of the management agents  580  may be persistently hosted in the service distribution  500 A to capture activity and events that may be relevant to ensuring and auditing compliance with policies, while one or more policies may control whether the service distribution  500 A can move from one lifecycle mode to another (e.g., the policies may restrict moving the service distribution  500 A from the creation mode to the release mode until the workload management system can ensure that the service distribution  500 A meets certain sanity, safety, or policy constraints). 
     Thus, as described in further detail above, the zero residue management agents  580  may provide control for various different modes that occur during the lifecycle  500 B of the service distribution  500 A, including a creation mode for initially creating the service distribution  500 A from one or more images stored in a suitable repository, a release mode for delivering the service distribution  500 A to suitable entities that will interact with or host the service distribution  500 A, a production mode for deploying the service distribution  500 A to such entities, a test mode for validating that the service distribution  500 A functions correctly, a maintenance mode for debugging, patching, or otherwise updating the service distribution  500 A, an optional re-release mode for delivering subsequent versions of the service distribution  500 A with any changes applied during the production, test, or maintenance modes, and an eventual retirement mode for de-provisioning any existing versions of the service distribution  500 A in response to the service distribution  500 A becoming outdated or obsolete. 
     According to one aspect of the invention,  FIG. 6  illustrates a flow diagram of an exemplary method  600  for managing different modes of a service distribution lifecycle with zero residue management agents. In particular, the zero residue management agents shown in  FIG. 5A  and described in further detail above may be used to manage the different modes of the service distribution lifecycle depending on a current mode of the service distribution. As such, managing the service distribution lifecycle may be initiated in an operation  610 , wherein a management workload may be launched to manage the service distribution lifecycle. In particular, an operation  620  may include determining the current mode of the service distribution (e.g., creation, release, production, test, maintenance, etc.), wherein one or more management agents associated with the current mode may be executed in an operation  630 . The management agents associated with the current mode may then continually execute any management tasks associated with the current mode until the workload management system determines that the current mode of the service distribution lifecycle has completed in an operation  640 . For example, a monitoring management agent may be executed in operation  630  during release, production, test, maintenance, or other appropriate modes to capture events that may be relevant to monitoring the health of the service distribution, compliance with one or more policies, or other suitable information. Thus, the monitoring agent may capture changes that occur to the service distribution during the various lifecycle modes, which may provide a record tracking or otherwise describing an evolution of the service distribution (e.g., for reference to diagnose, audit, or otherwise manage the service distribution). 
     As such, the management agents executed during operation  630  may add, remove, or disable aspects of the service distribution, wherein the management tasks executed during operation  630  may be controlled based on the current lifecycle mode and any other information relevant to managing identities, policies, compliance, or other aspects of the infrastructure (e.g, certain maintenance tasks may be limiting during well managed modes and restored in other modes). In one implementation, operation  640  may determine that the current mode of the service distribution lifecycle has completed based on one or more policies that control whether the service distribution lifecycle can move from one mode to another (e.g., the policies may define approval or rule validation mechanisms). Alternatively (or additionally), the current mode of the lifecycle may complete in response to the management agent executed during operation  630  completing the relevant management tasks, in response to one or more changes to the service distribution that indicate a change in mode, or other suitable criteria. In any case, in response to determining that the current mode of the service distribution lifecycle has completed in operation  640 , the management agent executed during operation  630  may then be removed from the service distribution in an operation  650 , and a pristine or golden state for the service distribution may then be restored in, an operation  660 . For example, in one implementation, restoring the state for the service distribution may include removing any runtime state associated with the management agent executed during operation  630  and rolling back any temporary changes that the management agent applied to the service distribution during operation  630 . 
     Thus, in response to restoring the state for the service distribution in operation  660 , the service distribution may be in the golden or pristine state prior to entering a next mode of the lifecycle (including any persistent changes that the management agents applied to the service distribution during operation  630 ). In particular, an operation  670  may include determining whether or not to retire the service distribution (e.g., in response to the service distribution including outdated or obsolete components), wherein the service distribution may then be retired in an operation  680 . For example, retiring the service distribution in operation  680  may include de-provisioning any existing versions of the service distribution, de-allocating any resources associated with the existing versions of the service distribution, migrating information to persistent repositories to enable subsequent auditing of the lifecycles for the de-provisioned service distributions, or other suitable tasks for removing the service distribution from operation in the infrastructure. Alternatively, in response to operation  670  determining that the service distribution will not be retiring, the method  600  may return to operation  620  to identify a next mode of the service distribution lifecycle and initiate execution of one or more management agents for the identified mode. As such, the method  600  may iteratively insert management agents into the service distribution based on the current mode and then remove the management agents from the service distribution until the service distribution eventually retires in operation  680 . 
     Implementations of the invention may be made in hardware, firmware, software, or various combinations thereof. The invention may also be implemented as instructions stored on a machine-readable medium, which may be read and executed using one or more processing devices. In one implementation, the machine-readable medium may include various mechanisms for storing and/or transmitting information in a form that can be read by a machine (e.g., a computing device). For example, a machine-readable storage medium may include read only memory, random access memory, magnetic disk storage media, optical storage media, flash memory devices, and other media for storing information, and a machine-readable transmission media may include forms of propagated signals, including carrier waves, infrared signals, digital signals, and other media for transmitting information. While firmware, software, routines, or instructions may be described in the above disclosure in terms of specific exemplary aspects and implementations performing certain actions, it will be apparent that such descriptions are merely for the sake of convenience and that such actions in fact result from computing devices, processing devices, processors, controllers, or other devices or machines executing the firmware, software, routines, or instructions. 
     Furthermore, aspects and implementations may be described in the above disclosure as including particular features, structures, or characteristics, but it will be apparent that every aspect or implementation may or may not necessarily include the particular features, structures, or characteristics. Further, where particular features, structures, or characteristics have been described in connection with a specific aspect or implementation, it will be understood that such features, structures, or characteristics may be included with other aspects or implementations, whether or not explicitly described. Thus, various changes and modifications may be made to the preceding disclosure without departing from the scope or spirit of the invention, and the specification and drawings should therefore be regarded as exemplary only, with the scope of the invention determined solely by the appended claims.