Patent Publication Number: US-9432277-B2

Title: System and method for modeling interdependencies in a network datacenter

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 12/868,426, filed Aug. 25, 2010 (and issued as U.S. Pat. No. 8,769,084 on Jul. 1, 2014), which claims the benefit of U.S. Provisional Patent Application Ser. No. 61/352,257, filed Jun. 7, 2010, entitled “System and Method for Creating and Leveraging a Configuration Management Database,” the contents of which are hereby incorporated herein by reference in their entirety. 
     In addition, this application is related to (1) U.S. patent application Ser. No. 12/868,475, filed Aug. 25, 2010 (status: pending), entitled “System and Method for Detecting Real-Time Security Threats in a Network Datacenter,” and (2) U.S. patent application Ser. No. 12/868,507, filed Aug. 25, 2010 (and issued as U.S. Pat. No. 8,745,188 on Jun. 3, 2014), entitled “System and Method for Managing Changes in a Network Datacenter,” each of which also claim the benefit of U.S. Provisional Patent Application Ser. No. 61/352,257, and the contents of each of which are hereby incorporated herein by reference in their entirety. 
    
    
     FIELD OF THE INVENTION 
     The invention relates to a system and method for modeling interdependencies in a network datacenter, and in particular, to populating a configuration management database with an inventory of resources in the datacenter, collecting flows describing network activity observed within the datacenter, and deliberately dropping any of the collected flows that originate from outside the datacenter or otherwise fail to correlate with the resource inventory, whereby the interdependencies in the datacenter may be modeled from a deliberately reduced sample of the collected flows that have information relevant to modeling relationships between resources within the datacenter. 
     BACKGROUND OF THE INVENTION 
     Usage and quality for a configuration management database are often affected by the accuracy and timeliness of relationship information cataloged in the configuration management database. In particular, configuration management databases typically house information describing various information technology resources in a network datacenter in addition to relationships and other dependencies between the information technology resources. As such, configuration management databases typically contain equal or greater amounts of relationship information relative to the number of resources inventoried therein. Consequently, obtaining and maintaining information describing relationships between resources in a datacenter can be extremely labor-intensive and error-prone, which typically results in configuration management database repositories lacking trust within the information technology community. For example, many organizations have expressed skepticism that dependencies and other relationships between resources in network datacenters can be suitably mapped without harming or degrading performance within the datacenter. 
     Due to these and other challenges, many of which relate to modeling dependencies between resources in information technology datacenters, developing techniques to improve trust in configuration management database technology remains an important factor in their successful adoption. However, although some technologies have shown the potential to create dependency mappings, existing systems have fallen short in actually making such dependency mappings commonplace in the information technology industry. For example, passive network scanners have been proposed as a technology that can model resources and dependencies in information technology datacenters, but passive network scanners typically require dedicated and hardwired connections to switch equipment deployed within the datacenter. Therefore, existing efforts to model resources and dependencies with passive network scanners often suffer from drawbacks relating to the expense and difficulty associated with rewiring network equipment to communicate with the passive network scanners (e.g., due to organizational, regulatory, or other reasons). In another example, modeling resources and dependencies in information technology datacenters has been attempted with technology that installs agents on every resource in the datacenter. Despite having the potential to model dependencies among the resources in the datacenter, installing agents on each and every resource can introduce intensive labor requirements and resource expenses, which has interfered with the suitability of mass-adoption for this approach to datacenter modeling. 
     Further still, other attempts to model dependencies between information technology resources include technologies that periodically probe every resource in the datacenter (e.g., sending the resources specific operating system commands designed to elicit responses about TCP/IP dependencies known to the resources). Although these probing techniques also have the potential to model dependencies between the datacenter resources, probing technologies typically suffer from coverage gaps due to intervals between the times when the polling or probing occurs. In other words, a resource dependency model created with periodic probing technologies would only be valid at a particular point in time (i.e., when the probe occurs), and moreover, would immediately become stale due to the inability to reflect any changes to the dependencies that arise subsequent to a particular probe (i.e., another probe would be required to update the dependency model in view of the subsequent changes). As such, despite many efforts in the information technology industry that focus on the constant search for newer and better techniques to map interdependencies between resources in network datacenters, the efforts that the industry has undertaken to date suffer from various drawbacks that interfere with successful mass adoption for configuration management databases. 
     Another topic that presents an important concern relating to datacenter management relates to suitably detecting security threats within the datacenter. Although various systems have been developed in the domain of network security and intrusion detection, such as tools built around Network Behavior Analysis (NBA) technology, the existing systems typically warehouse information relating to network flows and other activity within the datacenter for forensic (i.e., after-the-fact) analysis. As such, the techniques used in existing security and intrusion detection systems typically require large data warehouses to maintain archives that describe each and every flow reported in the datacenter. However, although existing systems typically maintain large amounts of information that can permit mining for interesting behavior or activity in the datacenter, the usefulness that these existing systems provide tends to be limited to detecting rogue or malicious activity post-mortem. In other words, because systems for detecting security threats that have been developed to date tend to be geared towards supporting user queries and ad-hoc analysis, existing systems often fall short in their ability to monitor activity within a datacenter to detect security threats or rogue behavior in real-time. 
     Moreover, yet another issue that often imposes difficulties on datacenter management includes assessing the scope and impact that may result from a considered set of proposed changes to information technology resources in the datacenter (e.g., servers, applications, hardware, etc.). The processes typically used to allow participants to understand the full scope of a set of changes can often be difficult, time-consuming, and error-prone, especially in large datacenters that have large numbers of information technology resources. Furthermore, in most (if not all) cases, no single person within an information technology organization knows every function and purpose that the information technology resources serve in the datacenter. Although configuration management databases have been used in various existing systems to support browsing and navigating relationships between information technology resources, the existing systems tend to employ ad-hoc techniques that fall short in their ability to quickly and accurately assess the scope, impact, and potential conflicts that the proposed changes may have in the datacenter. Thus, because efficiency and agility are among the most important concerns to managing modern information technology datacenters, existing systems suffer from various drawbacks in automating datacenter changes, including collaborative decision support among human participants to resolve potential problems with proposed changes. 
     SUMMARY OF THE INVENTION 
     According to one aspect of the invention, the system and method described herein may be used to create a configuration management database in a network datacenter, wherein the configuration management database may model interdependencies, detect real-time security threats, and manage proposed changes in the network datacenter. In particular, the system and method described herein may obtain accurate and timely information describing relationships and interdependencies in the datacenter, which may be modeled in a dependency database. As such, the information modeling the relationships and interdependencies in the dependency database may be used to seed the configuration management database. Further, the system and method described herein may employ Netflow or other network protocols that can suitably collect information relating to network traffic in the datacenter in a lightweight and non-impacting manner, which may achieve the desired end result of seeding the configuration management database with information describing various resources in the datacenter and relationships and interdependencies between the resources without consuming or needlessly risking impact on the operations performed by the resources in the datacenter. 
     According to one aspect of the invention, the system and method described herein may deliberately sample or selectively extract certain portions of information from various available network flows that traverse the datacenter. The deliberate sampling or selective extraction techniques may deliberately damper or reduce impacts on operations in the datacenter, as a number of flows needed to build a dependency map for the resources contained therein may be deliberately dampered. For example, any particular connection or “conversation” between network resources in the datacenter may be observed, wherein the observed connection or “conversation” may generally include two flows (i.e., one directed from an originating resource to a destination resource and another directed from the destination resource to the originating resource). As such, because the deliberately sampled mode may intentionally damper the number of observed flows needed to build the dependency map, the system and method may include various components that can distinguish which one of the resources originated the connection to thereby model a directional dependency between the originating resource and the destination resource. Thus, the deliberate sampling techniques may lessen impact on the datacenter without compromising the ability to model the relationships and dependencies between the resources therein to optimally balance effectiveness and practicality. 
     According to one aspect of the invention, the system and method described herein may create a dependency map modeling any suitable relationships or interdependencies between resources in the datacenter and store the dependency map in a configuration management database. In particular, one or more listeners may observe network flows that occur in the datacenter using information describing network conversations emitted from physical switch equipment or other communication devices in the datacenter. Thus, the listeners may receive information describing certain network conversations that occur in the datacenter, wherein the network conversation information may then be used to derive the dependency map that models the relationships or interdependencies between the resources. Furthermore, the listeners may be particularly configured to negate challenges, including expense upon resources in the datacenter and risk that the operation of the resources will be dangerously impacted due to excess bandwidth consumption, which could otherwise arise from processing every conversation that occurs in the datacenter. 
     According to one aspect of the invention, for example, the system and method described herein may include a discovery engine that can perform a discovery scan to baseline every listening port and/or TCP/IP resource in the datacenter. As such, the discovery engine may generally perform the discovery scan to create an inventory describing every information technology resource in the datacenter, including any open TCP/IP ports or other open communication interfaces configured to listen for network flows or other traffic in the datacenter. In one implementation, the inventory created with the discovery engine may then be stored in a resource inventory, which a dependency engine may then reference to model relationships or dependencies between the inventoried resources. In particular, using the resource inventory, the dependency engine may create and configure the listeners that accept the information describing the network flows observed in the datacenter, whereby the listeners may collect raw information describing network flows and provide the raw network flow information to the dependency engine. The dependency engine may then further analyze the raw network flow information to derive the relationships or other dependencies between the resources in the inventory and store a dependency map describing the derived relationships or other dependencies in a dependency database. For example, the listeners may generally collect only one of two flows involved in a particular connection (i.e., the flow directed from the originating resource to the destination resource). Consequently, the dependency engine  130  may determine a directionality for the raw network flows to distinguish the two resources into the originating resource and the destination resource. 
     According to one aspect of the invention, the system and method described herein may deliberately drop certain flows that originate from outside the datacenter and terminate inside the datacenter because such flows may represent noise or information having little or no value to modeling the relationships or dependencies within the datacenter. For example, the dependency engine may apply various rules or policies to determine directionalities for the network flows that the listeners observe, drop certain network flows that represent noise or useless information to modeling the relationships or dependencies in the datacenter, and correlate certain network flows that include information useful to modeling the relationships or dependencies within the datacenter. In particular, to determine the directionality for any particular network flow, which may generally represent a connection or conversation between two information technology resources, the network flow may be correlated with the information described in the resource inventory. In response to locating either of the two resources in the inventory, the dependency engine may determine that the located resource represents a destination for that particular flow and that the other resource represents the originator. Thus, in response to locating the originating and destination resources in the inventory, the dependency engine may model a dependency between the originating resource and the destination resource in the dependency database. 
     According to one aspect of the invention, the system and method described herein may further determine that the correlated network flow originates from a resource residing outside the datacenter in response to the originating resource having a network address that falls outside a network address sub-range for the datacenter or otherwise lacking description in the inventory. Thus, in response to the network flow originating from outside the datacenter, the network flow may be dropped. Furthermore, the network flow may be dropped in response to the flow not correlating with any known information modeled in the resource inventory. In particular, in response to the flow not correlating with any of the information modeled in the resource inventory, the dependency engine may determine that the flow likely represents sporadic activity from individuals working inside the datacenter with resources located outside the datacenter (e.g., opening a web browser to a remote server). In one implementation, the dependency engine may further validate whether the listener that observed the dropped network flow has previously collected a certain quantity of useful activity (e.g., in response to the listener having previously collected information resulting in a security violation) to determine whether the listener represents a useful input gateway for collecting information directed from outside to inside the datacenter. On the other hand, in response to the listener not having collected sufficient useful information, the listener may be de-provisioned to avoid having the listener continue to observe network flows that have little or no value to managing the datacenter. 
     According to one aspect of the invention, in response to performing the discovery scan to create the resource inventory describing the resources in the datacenter, the configuration management database may be seeded with various configuration items describing the inventoried resources. Further, in response to detecting any new or changed relationships or other dependencies within the datacenter, the relationships or dependencies may be modeled with configuration items describing the relationships or dependencies in the configuration management database. The configuration management database may therefore include various configuration items describing every resource modeled in the resource inventory and every dependency modeled in the dependency database. The dependency engine may further dynamically update the configuration management database in response to discovering any new or changed information associated with the resources and dependencies modeled therein. Furthermore, a management infrastructure may then reference the configuration management database to provide management over the datacenter in various ways (e.g., to detect real-time security threats in the datacenter, assess the scope and impact proposed changes may have in the datacenter, and manage conflicts that the proposed changes may have in the datacenter. 
     According to one aspect of the invention, the system and method described herein may be used to detect real-time security threats in the datacenter. In particular, the real-time security alerts may be generated in response to detecting any new or previously unknown services in the datacenter, in response to any known services initiating or otherwise performing new or previously unknown activity, or various combinations thereof. For example, various listeners may observe activity streams describing network traffic that occurs in the datacenter, wherein the activity streams may be compared to information that describes known service endpoints in the datacenter. Thus, known service endpoints in the datacenter may be mapped to populate a configuration management database, wherein the known service endpoints may provide a baseline describing a steady-state (or normal state) for the datacenter. For example, open communication ports in the datacenter may be scanned to identify running or installed services to derive an accurate and up-to-date feed describing the known service endpoints in the datacenter. Furthermore, a datacenter flow and rule engine (alternatively referred to as a “correlation engine” or “rule engine”) may apply various tunable heuristics and rules to analyze the network activity, wherein the tunable heuristics and rules may define conditions or criteria for determining whether certain activity may potentially be malicious, unauthorized, rogue, or otherwise suspicious. The datacenter flow and rule engine may therefore apply the tunable heuristics and rules to detect whether any of the activity streams describe new service activity (e.g., a service initiating or beginning new activity). 
     According to one aspect of the invention, any new service activity may then be correlated with the known service endpoints to determine whether the activity streams represent known or unknown activity. In response to a non-intersection between any of the new service activity and the known service endpoints, the new service activity may be deemed to represent a potential security threat and a real-time security alert may be generated to report any network flows or other conversations associated with the new service activity. As such, in response to generating the security alert describing the unexpected traffic, the unexpected flows or network conversations may be reported for remediation to one or more automated security systems, management personnel, or other entities having responsibility for managing the datacenter (e.g., a security remediation event processor, a security event information management (SIEM) system, etc.). Additionally, in response to suitably completing the remediation for the security alert, the heuristics and rules may be tuned based on an outcome from such remediation. As such, the configuration management database may be updated to include information describing the outcome from such remediation, any new or otherwise tuned heuristics or rules created in response to such remediation, or any other suitable information that can be used to correlate subsequent activity that occurs in the datacenter with the known service endpoint mapping maintained in the configuration management database. 
     According to one aspect of the invention, the system and method described herein may further be used to assess the scope and impact that proposed changes may have in a network datacenter. In particular, various configuration items and relationships between the configuration items may be stored in a configuration management database, which may therefore provide a navigational structure that can be used to automatically assess and report on proposed changes to the datacenter. In particular, a datacenter change request may generally propose any suitable set of changes to the datacenter, wherein the change request may to remedy an information technology resource experiencing degraded performance, failure, or another situation that prompted the proposed changes. In response to deriving the proposed changes, one or more human participants required to authorize, agree, or otherwise approve the proposed changes may be identified. In one implementation, the change request may then be further analyzed to generate decision support information that may be referenced to determine whether the proposed changes are agreeable or otherwise appropriate, wherein the decision support information may include an assessment of the proposed changes that provides the human participants with sufficient information to decide whether the proposed changes can suitably proceed. For example, the change request may be analyzed to identify a set of one or more configuration items that the proposed changes will newly add, modify, or change in the configuration management database. The configuration management database may then be queried to produce a navigational traversal from the identified set of configuration items, wherein the configuration management database may analyze any relationships defined for the configuration items and create a graph data structure that represents the navigational traversal produced from the identified configuration items and any relationships that may be defined for the identified configuration items. The navigational traversal may then be combined with various domain-specific inclusions and/or exclusions, which may modify the navigational traversal to remove “noise” or other information that may not be necessary to determine whether or not to authorize or otherwise approve the proposed changes. Thus, the navigational traversal may generally represent a set of navigation pathways that emanate from a start of the navigational traversal to any endpoints that the proposed changes may impact. 
     In one implementation, the navigation pathways derived from the navigational traversal may then be further analyzed to filter the endpoints that the proposed changes potentially impact. Thus, the filtered set of potentially impacted endpoints may represent an initial assessment of the scope of the potential impacts that the proposed changes may have in the datacenter. In one implementation, in response to determining that the potentially impacted endpoints include no essential or otherwise critical resources, the change request may be readied and queued for automatic execution (i.e., without any human intervention). In addition, the impact analysis that resulted in automating the change request may be reported to provide decision support data that corroborates the decision to permit non-human automation. On the other hand, in response to the potentially impacted endpoints including one or more essential or critical resources, the human participants required to authorize or approve the proposed changes may be identified and a change remediation workflow among the identified human participants may be managed to resolve the potential impacts. 
     According to one aspect of the invention, the system and method described herein may further be used to detect and resolve conflicts that proposed changes may have in the datacenter. In particular, multiple proposed changes may be queued and readied for later execution once any potential impacts on essential or otherwise critical resources have been resolved. For example, one or more of the proposed changes may be queued for execution during off-hours or planned maintenance periods to avoid the potential impacts. Thus, even though multiple different change requests may seem unrelated, potential conflicts may nonetheless arise depending on how the multiple change requests have been queued for execution. As such, the navigation pathways produced for assessing the potential impacts from the multiple change requests may be analyzed to determine whether the multiple change requests have any potential conflicts (e.g., where one request includes a change to a particular resource scheduled during weekend maintenance and another request includes a change to a related resource scheduled during the same maintenance period). Accordingly, in response to detecting potential conflicts between multiple change requests, an event may be triggered to stop the potentially conflicting changes from proceeding through automated execution and notify human change personnel in a remediation workflow that an adjustment to resolve the potential conflicts must be made. Furthermore, the conflict analysis and other any processes involved in the change remediation workflow (including any impact analysis) may be reported to provide decision support data that corroborates any decisions to automate the change requests, resolve the potential conflicts, or otherwise manage potential conflicts from the multiple proposed changes. 
     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. 1  illustrates an exemplary system for creating a configuration management database that can be used to model interdependencies, detect real-time security threats, and manage proposed changes in a network datacenter, according to one aspect of the invention. 
         FIG. 2  illustrates an exemplary method for modeling interdependencies in a network datacenter, according to one aspect of the invention. 
         FIG. 3  illustrates an exemplary method for detecting real-time security threats in a network datacenter, according to one aspect of the invention. 
         FIG. 4A  illustrates an exemplary method for assessing the scope and impact that proposed changes may have in a network datacenter, according to one aspect of the invention. 
         FIG. 4B  illustrates an exemplary method for detecting and resolving conflicts that proposed changes may have in a network datacenter, according to one aspect of the invention. 
     
    
    
     DETAILED DESCRIPTION 
     According to one aspect of the invention,  FIG. 1  illustrates an exemplary system  100  for creating a configuration management database  160  in a network datacenter  110 , wherein the configuration management database  160  created with the techniques described herein may be used to model interdependencies, detect real-time security threats, and manage proposed changes in the network datacenter  110 . In particular, the system  100  shown in  FIG. 1  and described herein may obtain accurate and timely information describing relationships and interdependencies in the datacenter  110 , which may then be stored in a dependency database  135   b  containing information describing such relationships and interdependencies. As such, the information describing the relationships and interdependencies in the dependency database  135   b  may be used to seed the configuration management database  160 . For example, in one implementation, the system  100  may employ Netflow or various other network protocols that can suitably collect information relating to network traffic in the datacenter  110  in a lightweight and non-impacting manner, which may achieve the desired end result of seeding the configuration management database  160  with information describing various information technology resources in the datacenter  110  and relationships and interdependencies between the resources without consuming or needlessly risking impact on the operations performed by the resources in the datacenter  110 . 
     In particular, the system  100  shown in  FIG. 1  and described herein may deliberately sample or selectively extract certain portions of information from various available network flows that traverse the datacenter  110 . As such, the deliberate sampling or selective extraction techniques may deliberately damper or reduce impacts on operations in the datacenter  110  because a number of flows needed to build a dependency map for the resources contained therein may be deliberately dampered. For example, as noted above, the system  100  may employ Netflow or other suitable network protocols that can observe any particular connection or “conversation” between network resources in the datacenter  110 , wherein the observed connection or “conversation” may generally include two flows (i.e., one flow directed from an originating resource to a destination resource, and another flow directed from the destination resource to the originating resource). As such, because the system  100  generally operates in a deliberately sampled mode that intentionally dampers the number of flows observed to build the dependency map, the system  100  may include various components that can distinguish which one of the resources originated the connection or conversation and thereby model a directional dependency between the originating resource and the destination resource. Thus, the deliberate sampling techniques described in further detail herein may lessen impact on the datacenter  110  without compromising the ability to model the relationships and dependencies between the resources therein, whereby the configuration management database  160  may be created with techniques that optimally balance effectiveness and practicality. However, Netflow could be suitably replaced with any other protocol, system, or application that can generate a raw set of feeds describing network flows from a particular source in the datacenter  110  (e.g., requests to authenticate users, run commands, send information, etc.). For example, the system  100  may include one or more active scanners that can probe the resources in the datacenter  110  or communicate with one or more agents installed on the resources in the datacenter  110 , but the selective sampling techniques that leverage Netflow, as described herein, may have advantages in providing a lightweight approach to modeling dependencies in the datacenter  110 . 
     In one implementation, as noted above, the system  100  may create a dependency map modeling any suitable relationships or interdependencies between resources in the datacenter  110 , wherein the dependency map modeling the relationships or interdependencies between the resources may be stored in a configuration management database  160 . In particular, one or more listeners  150  may be configured to use Netflow or another suitable network protocol that can observe network flows that occur in the datacenter  110 . For example, physical switch equipment or other suitable communication devices in the datacenter  110  may generally use Netflow or the other network protocols to emit information describing network conversations between information technology resources in the datacenter  110 , wherein the information describing the network conversations may be emitted to the listeners  150 . Thus, the listeners  150  may generally receive information describing certain network conversations that occur in the datacenter  110  (i.e., from the physical switch equipment or other communication devices), wherein the network conversation information may then be used to derive the dependency map that models the relationships or interdependencies between the resources. Furthermore, as described in further detail herein, the listeners  150  may be particularly configured to negate challenges that may arise from processing every conversation that occurs in the datacenter  110  (e.g., expending storage, processing, and other resources, potentially risking dangerous impacts on the operation of the resources due to excess bandwidth consumption, etc.). 
     For example, in one implementation, the system  100  may include a discovery engine  120  configured to perform a discovery scan that baselines (i.e., identifies) every listening port and/or TCP/IP resource in the datacenter  110 . In one implementation, the discovery engine  120  may include any suitable port-scanning system or application that can identify the listening ports and/or TCP/IP resources in the datacenter (e.g., an open source map security scanning system or application, an Angry IP Scanner, etc.). As such, the discovery engine  120  may generally perform the discovery scan to create an inventory describing every information technology resource in the datacenter  110 , wherein the inventory may generally list any open TCP/IP ports or other open communication interfaces configured to listen for network flows or other traffic on the various information technology resources described in the inventory. In one implementation, the inventory created with the discovery engine  120  may then be stored in a resource inventory  135   a , which a dependency engine  130  may then reference to map relationships or dependencies between the resources inventoried therein. In particular, using the list of the open TCP/IP ports or other open communication interfaces on the resources described in the resource inventory  135   a , the dependency engine  130  may create and configure the one or more listeners  150  to accept information describing network flows that occur in the datacenter  110  (e.g., the physical network switch equipment may be modified or otherwise configured to direct information describing any network flows that traverse the switch equipment to the listeners  150 ). 
     As such, in one implementation, the listeners  150  may generally collect raw information describing the network flows emitted from the physical network switch equipment or other communication devices and provide the raw network flow information to the dependency engine  130 . In one implementation, the dependency engine  130  may then further analyze the raw network flow information provided from the listeners  150  to derive relationships or other interdependencies between the resources described in the resource inventory  135   a , wherein the dependency engine  130  may store a dependency map describing the derived relationships or other interdependencies in a dependency database  135   b . For example, the listeners  150  may be configured as destination listeners that only collect one of two flows involved in a particular connection or conversation between two resources (i.e., the flow directed from the originating resource to the destination resource). Consequently, the dependency engine  130  may determine a directionality for the raw network flows to distinguish the two resources into the originating resource and the destination resource. Further, because many flows that originate outside the datacenter  110  and terminate inside the datacenter  110  may represent noise or information that may have little or no value to modeling relationships or interdependencies within the datacenter  110 , the dependency engine  130  may deliberately drop certain flows that originate from outside the datacenter  110 . 
     For example, in one implementation, the dependency engine  130  may include a datacenter flow and rule engine  140  (alternatively referred to as a “correlation engine” or “rule engine”), which may be configured to apply one or more rules or policies to determine directionalities for the network flows that the listeners  150  observe and report to the dependency engine  130 , drop certain network flows reported from the listeners  150  that represent noise or useless information to modeling the relationships or interdependencies within the datacenter  110 , and correlate certain network flows reported from the listeners  150  that include information useful to modeling the relationships or interdependencies within the datacenter  110 , among other things. In particular, to determine the directionality for any particular network flow reported from the listeners  150 , which may generally represent a connection or conversation between two information technology resources, the datacenter flow and rule engine  140  may correlate the network flow with the open TCP/IP ports or other communication interfaces identified in the discovery scan and described in the resource inventory  135   a . In response to locating either of the two information technology resources in the resource inventory  135   a , the datacenter flow and rule engine  140  may determine that the located resource represents a destination for that particular flow and that the other resource represents the originator for that particular flow (i.e., because the listeners  150  may be configured to only collect the flow in the conversation directed from the originating resource to the destination resource). Thus, in response to locating the originating resource and the destination resource in the resource inventory  135   a , the datacenter flow and rule engine  140  may model a dependency between the originating resource and the destination resource in the dependency database  135   b.    
     Furthermore, in one implementation, the datacenter flow and rule engine  140  may determine that the correlated network flow originates from a resource that resides outside the datacenter  110  in response to the originating resource having a network address that falls outside a network address sub-range (e.g., a TCP/IP sub-range) for the datacenter  110  or in response to the resource inventory  135   a  otherwise lacking information describing the resource. Thus, in response to the correlated network flow originating from outside the datacenter  110 , the datacenter flow and rule engine  140  may drop the network flow. In addition, the network flow may be dropped in response to the datacenter flow and rule engine  140  determining that the flow does not correlate with any known TCP/IP ports, communication interfaces, or other resources described in the resource inventory  135   a . In particular, in response to the flow not correlating with any of the information modeled in the resource inventory  135   a , the datacenter flow and rule engine  140  may determine that the flow likely represents sporadic activity from individuals working on resources inside the datacenter  110  to resources outside the datacenter  110  (e.g., opening a web browser to access a remote web server). In one implementation, however, the datacenter flow and rule engine  140  may further validate whether the listener  150  that observed the dropped network flow has previously collected a certain quantity of useful activity. For example, in response to the listener  150  that observed the dropped network flow having previously collected information that resulted in detecting security violations, the datacenter flow and rule engine  140  may determine that the listener  150  represents a useful input gateway from outside the datacenter  110  to inside the datacenter  110 , whereby the listener  150  may continue to observe network flows that can be used to manage the datacenter  110  in other ways. On the other hand, in response to the listener  150  not having collected sufficient useful information, the datacenter flow and rule engine  140  may de-provision the listener  150  to avoid having the listener  150  continue to report network flows that have little or no value to management within the datacenter  110 . 
     Thus, in response to performing the discovery scan to create the resource inventory  135   a  describing every resource in the datacenter  110 , the dependency engine  130  may seed the configuration management database  160  with various configuration items describing the resources inventoried within the resource inventory  135   a . Further, in response to modeling any relationships or other interdependencies between resources within the datacenter  110 , the dependency engine  130  may represent the dependency within the dependency database  135   b  and produce a configuration item describing the dependency in the configuration management database  160 . Accordingly, the configuration management database  160  may generally include various configuration items describing every resource in the datacenter mapping modeled in the resource inventory  135   a  and every relationship or other dependency in the dependency mapping modeled in the dependency database  135   b . In one implementation, the configuration management database  160  may therefore be dynamically updated in response to subsequently discovering any new or changed information associated with the resources and dependencies modeled with the configuration items stored in the configuration management database  160 , wherein a management infrastructure  170  may then reference the configuration management database  160  to provide management over the datacenter  110  in various ways (e.g., via the dashed line in  FIG. 1  connecting the management infrastructure  170  to the information technology datacenter  110 ). For example, as will be described in further detail below, the configuration items stored in the configuration management database  160  may be referenced by a security system  180   a , a change management system  180   b , and/or a workflow engine  185   c  to detect real-time security threats in the datacenter  110  (e.g.,  FIG. 3 ), assess the scope and impact that proposed changes may have in the datacenter  110  (e.g.,  FIG. 4A ), and detect and resolve conflicts that the proposed changes may have in the datacenter  110  (e.g.,  FIG. 4B ). 
     According to one aspect of the invention,  FIG. 2  illustrates an exemplary method  200  for modeling interdependencies in a network datacenter. In particular, the method  200  shown in  FIG. 2  and described herein may generally operate in and provide substantially similar functionality to the system  100  shown in  FIG. 1  and described in further detail above. For example, in one implementation, the method  200  may create a configuration management database that can be used to model interdependencies, detect real-time security threats, and manage proposed changes in a network datacenter. 
     For example, in one implementation, an operation  210  may include a discovery engine that performs a discovery scan to discover (i.e., baseline or otherwise identify) every listening port and/or TCP/IP resource in the datacenter. In one implementation, as noted above, the discovery engine may include any suitable port-scanning system or application that can identify the listening ports and/or TCP/IP resources in the datacenter (e.g., an open source nmap security scanning system or application, an Angry IP Scanner, etc.). As such, the discovery engine may generally perform the discovery scan to discover an inventory describing every resource in the datacenter, wherein the inventory may generally list any open TCP/IP ports or other open communication interfaces configured to listen for network flows or other traffic on the various described therein. In one implementation, the inventory created with the discovery engine may then be stored in a resource inventory, which a dependency engine may then reference to map relationships or dependencies between the resources inventoried therein. 
     In particular, using the list of the open TCP/IP ports or other open communication interfaces on the resources described in the resource inventory, an operation  220  may include the dependency engine creating and configuring one or more listeners to accept information describing network flows that occur in the datacenter (e.g., the physical network switch equipment may be modified or otherwise configured to direct information describing any network flows that traverse the switch equipment to the listeners). As such, the listeners may generally collect raw information describing the network flows emitted from the physical network switch equipment or other communication devices in an operation  230 , wherein the listeners may then provide the raw network flow information to the dependency engine. In one implementation, the dependency engine may then further correlate the raw network flow information provided from the listeners in an operation  240  to derive relationships or other interdependencies between the resources described in the resource inventory, wherein the dependency engine may store a dependency map describing the derived relationships or other interdependencies in a dependency database. For example, the listeners may be configured as destination listeners that only collect one of two flows involved in a particular connection or conversation between two resources (i.e., the flow directed from the originating resource to the destination resource). 
     In one implementation, the dependency engine may correlate the network flows with the resource inventory in operation  240  to determine a directionality for the raw network flows. In particular, the dependency engine may apply one or more rules or policies in an operation  245  to determine the directionality for the raw network flows and distinguish the two resources involved in the flow into an originating resource and a destination resource. For example, to determine the directionality for any particular network flow reported from the listeners, which generally represent a connection or conversation between two information technology resources, operation  240  may include correlating the network flow with the open TCP/IP ports or other communication interfaces described in the resource inventory. In response to locating either of the two resources in the resource inventory in operation  245 , the dependency engine may determine that the located resource represents a destination (or endpoint) for that particular flow in an operation  250 . In addition, the dependency engine may further determine that the other resource represents the originator for that particular flow (i.e., because the listeners only collect the flow directed from the originating resource to the destination resource). As such, in response to an operation  265  determining that the originating resource and the destination resource have been located in the resource inventory, an operation  270  may include modeling a dependency between the originating resource and the destination resource. 
     Alternatively, operation  245  may include determining that that the flow does not correlate with any known TCP/IP ports, communication interfaces, or other resources described in the inventory. In particular, in response to the flow not correlating with any of the information modeled in the resource inventory, the flow likely represents sporadic activity from individuals working inside the datacenter with resources outside the datacenter. Thus, the network flow may be similarly dropped in operation  260  in response to the flow not correlating with any of the information described in the resource inventory. Additionally, operation  265  may include determining that the correlated network flow originates from a resource residing outside the datacenter in response to the flow originating from a resource having a network address that falls outside a sub-range for the datacenter or otherwise lacking description in the inventory. Thus, in response to the correlated network flow originating from outside the datacenter, the network flow may be similarly dropped in operation  260 . However, in one implementation, an operation  280  may further include validating whether the listener that observed the dropped network flow previously collected a certain quantity of useful activity (e.g., in response to the listener having previously collected information resulting in a security violation). As such, operation  280  may include validating whether the listener represents a useful input gateway from outside the datacenter to inside the datacenter, whereby the listener may continue to observe network flows that can be used to manage the datacenter in other ways. On the other hand, in response to the listener not having collected sufficient useful information, the listener may be de-provisioned to avoid having the listener continue to observe flows that have little or no value to managing the datacenter. 
     Thus, in response to performing the discovery scan to inventory every resource in the datacenter, the configuration management database may be seeded with various configuration items describing the inventoried resources. Further, in response to modeling any relationships or other dependencies discovered between the resources in the datacenter, configuration items corresponding to the discovered relationships or other dependencies may be stored in the configuration management database. As such, the configuration management database may generally include various configuration items describing every resource and relationship or other dependency in the datacenter. Furthermore, in one implementation, the configuration management database may be dynamically updated in response to subsequently discovering any new or changed relationships or dependencies in the datacenter (e.g., according to the techniques described above in connection with the method shown in  FIG. 2 ). In one implementation, as will be described in greater detail below, a management infrastructure may then reference the configuration management database to manage the datacenter in various ways (e.g., to detect real-time security threats, assess the scope and potential impact from proposed changes, and detect and resolve potential conflicts from the proposed changes, etc.). 
     According to one aspect of the invention,  FIG. 3  illustrates an exemplary method  300  for detecting real-time security threats in a network datacenter. In particular, the method  300  shown in  FIG. 3  and described herein may provide various features that can be used to detect security threats within the network datacenter in real-time, and further to generate real-time alerts in response to detecting the real-time security threats in the datacenter. As used herein, detecting the security threats in “real-time” may generally refer to discovering or otherwise identifying potentially malicious, unauthorized, or otherwise rogue activity in the datacenter substantially simultaneously or close in time with respect to when such activity occurs, while generating the security alerts in “real-time” may similarly refer to creating events, alarms, warnings, or other notifications describing the potentially rogue activity substantially simultaneously or close in time with respect to when such activity has been detected. 
     For example, in one implementation, the method  300  shown in  FIG. 3  and described herein may generally issue the real-time security alerts in response to detecting any new or previously unknown services in the datacenter, in response to any known services initiating or otherwise performing new or previously unknown activity, or various combinations thereof. In particular, various listeners may use Netflow or another network protocol to observe activity streams describing network traffic that occurs in the datacenter in a similar manner as described above in connection with  FIGS. 1 and 2 . In one implementation, the activity streams may then be compared to information stored in a configuration management database that describes known service endpoints in the datacenter. For example, as described in further detail above, network switches, routers, and other communication devices in the datacenter may implement technologies based on Netflow or other network protocols that can observe network activity, whereby the network switches, routers, and other communication devices may report any and all network conversations to a targeted listener (e.g., the communication device may report any TCP/IP or other network conversations that interact with a particular service operating on the communication device to a targeted listener that has been configured to collect information describing network conversations that involve the particular service). 
     Thus, in one implementation, an operation  310  may generally include mapping known service endpoints in the datacenter and populating a configuration management database with the known service endpoints, wherein populating the configuration management database with the known service endpoints may provide information that can be referenced to generate real-time security alerts in response to detecting that any new services have been installed in the datacenter. In particular, viruses and other malware commonly install service endpoints within a targeted datacenter (e.g., Trojan Horses) prior to initiating activity that uses such service endpoints to infect servers and other resources in the targeted datacenter. As such, mapping the known service endpoints in operation  310  may provide a baseline describing a steady-state (or known safe state) for the datacenter. For example, in one implementation, operation  310  may include scanning open communication ports in the datacenter to identify services running or installed on the open communication ports (e.g., with open source nmap security scanning systems or applications, Angry IP Scanners, etc.). Further, in one implementation, operation  310  may be performed periodically, continuously, or at other suitable times (e.g., in response to one or more conditions satisfying a policy that results in triggering the operation  310  to map the known service endpoints). Accordingly, operation  310  may generally provide an accurate and up-to-date feed to the configuration management database that maintains the baseline (or steady-state) describing the known service endpoints in the datacenter. 
     In one implementation, in response to operation  310  populating the configuration management database with the known service endpoints mapped in the datacenter, an operation  320  may include defining various tunable heuristics and rules that a datacenter flow and rule engine (alternatively referred to as a “correlation engine” or “rule engine”) may apply to analyze network activity that occurs in the datacenter. In one implementation, the tunable heuristics and rules may generally define various conditions or criteria for determining whether certain activity that occurs in the datacenter may potentially be malicious, unauthorized, rogue, or otherwise suspicious. For example, as noted above, various targeted listeners may use Netflow or another suitable network protocol to observe network traffic that occurs in the datacenter, wherein activity streams describing the observed network traffic may be provided from the targeted listeners to the datacenter flow and rule engine (e.g., communication devices in the datacenter may report TCP/IP or other network conversations that interact with a particular service to a targeted listener specifically configured to observe network conversations that involve that service). 
     In one implementation, an operation  330  may then include the datacenter flow and rule engine applying the tunable heuristics and rules to the activity streams provided from the targeted listeners to detect whether any of the activity streams describe new service activity. For example, the datacenter flow and rule engine may detect the new service activity in response to any of the activity streams describing a service initiating activity in the datacenter. In one implementation, in response to detecting the new service activity, an operation  340  may then include the datacenter flow and rule engine correlating the new service activity with the known service endpoints mapped within the configuration management database. As such, operation  340  may generally include comparing the activity streams provided from the targeted listeners to the baseline or steady-state for the datacenter currently maintained in the configuration management database. In one implementation, the datacenter flow and rule engine may then determine whether any of the activity streams provided from the targeted listeners represents known or unknown activity in an operation  345 . In response to an intersection between the new service activity observed by the targeted listeners and the known service endpoints mapped in the configuration management database, the datacenter flow and rule engine may determine that the new service activity does not represent a potential security threat (e.g., because a valid resource initiated the new service activity during an interval between different service endpoint mappings performed in operation  310 ). Accordingly, in one implementation, an operation  370  may include updating the configuration management database with information describing the new service activity in response to detecting the intersection between the new service activity and the known service endpoint mapping (e.g., to avoid generating false positives for similar subsequent activity, wasting resources on processing new activity deemed to not represent a security threat, etc.). 
     On the other hand, in response to a non-intersection between any of the new service activity observed by the targeted listeners and the known service endpoints mapped in the configuration management database, the datacenter flow and rule engine may determine that the new service activity represents a potential security threat in the datacenter. In one implementation, in response to detecting the non-intersection between the known service endpoints and the new service activity described in any particular one of the activity streams, an operation  350  may include the datacenter flow and rule engine generating a real-time security alert to report any network flows or other conversations associated with the new service activity. In one implementation, in response to detecting the non-intersection between the known service endpoints and the new service activity in operation  350 , the datacenter flow and rule engine may report the flows or network conversations associated therewith because the flows or network conversations may be deemed to represent unexpected traffic falling out-of-scope from the baseline that the configuration management database maintains to describe the steady-state or normal state for the datacenter. As such, in response to generating the security alert describing the unexpected traffic, an operation  360  may include the datacenter flow and rule engine reporting the unexpected flows or network conversations for remediation to one or more automated security systems, management personnel, or other entities having responsibility for managing the datacenter. 
     For example, in one implementation, the security alert may be forwarded to a security remediation event processor, a security event information management (SIEM) system, or other suitable management entities, which may remediate the unknown activity in an operation  360 , wherein the management entities may immediately receive the real-time security alert describing the potentially malicious, unauthorized, rogue, or otherwise suspicious activity and initiate remediation for the security alert. In one implementation, in response to the management entities receiving the security alert, the unknown or suspicious activity may be remediated using any suitable security management techniques. For example, the management entities may correlate the security alert with any other events or information associated with the datacenter to determine whether the security alert represents an actual problem or a false alarm. Furthermore, in response to determining that the security alert represents an actual problem, the management entities may isolate any resources associated with the new service activity, take action to disable the new service that initiated the unexpected activity, monitor subsequent activity associated with the new service or the isolated resources to derive knowledge relating to how malicious users may attempt to exploit the new service activity, identify other resources that the new service may impact due to dependencies with the isolated or monitored resources, or any other suitable security management technique may be employed (e.g., as described in co-pending U.S. patent application Ser. No. 12/424,428, entitled “System and Method for Auditing Governance, Risk, and Compliance Using a Pluggable Correlation Architecture,” filed Apr. 15, 2009, the contents of which are hereby incorporated by reference in their entirety). 
     Additionally, in response to suitably completing the remediation for the security alert, operation  360  may further include tuning the heuristics and rules based on an outcome from such remediation. For example, operation  360  may include defining a new rule to identify the service that initiated the unexpected activity as a malicious process in response to determining that the activity represents rogue traffic, identify the service as an acceptable process in response to determining that the activity represents benign traffic, or otherwise define criteria or conditions that the datacenter flow and rule engine may reference to correlate subsequent activity that occurs in the datacenter with the known service endpoint mapping maintained in the configuration management database. As such, in response to suitably completing the remediation for the security alert, the configuration management database may be updated in operation  370  to include information describing the outcome from such remediation, any new or otherwise tuned heuristics or rules created in response to such remediation, or any other suitable information that can be used to correlate subsequent activity that occurs in the datacenter with the known service endpoint mapping maintained in the configuration management database. 
     According to one aspect of the invention,  FIG. 4A  illustrates an exemplary method  400 A for assessing the scope and impact that proposed changes may have in a network datacenter. In particular, the method  400 A shown in  FIG. 4A  and described herein may provide automated techniques to manage one or more proposed changes to the network datacenter, assess the proposed changes quickly and accurately, and drive efficiency and agility in the datacenter. For example, as will be described in further detail herein, the method  400 A may perform one or more automated queries to identify any services, applications, systems, or other resources in a configuration management database that the proposed changes may impact and automatically apply one or more rules to navigate and reports results returned from in response to the automated queries. 
     In one implementation, the method  400 A may include discovering a resource inventory within the datacenter in an operation  410   a , wherein the resource inventory may be discovered with similar techniques as described in further detail above with reference to  FIGS. 1 through 3 , although the resource inventory may alternatively be discovered with any other suitable techniques, whether or not explicitly described. In one implementation, the resource inventory discovered in operation  410   a  may generally include a configuration item (CI) to represent one information technology resource, wherein the configuration item may model the represented resource to a granularity that can be useful to reporting potential impacts from proposed changes to the resource or another resource related thereto. For example, any particular configuration item may contain or be related to sub-components of an information technology resource. Further, the configuration item may use or own other configuration items in the resource inventory (e.g., a shared storage infrastructure may have a configuration item that represents a server resource, which may use or own one or more other configuration items in the shared storage infrastructure). In addition, the resource inventory may further include relationships among the configuration items stored therein, including relationships between configuration items and sub-components of the configuration items and between multiple different configuration items, among others. Thus, in addition to the configuration items describing resources in the datacenter, the resource inventory discovered in operation  410   a  may further include peer, dependency, or other semantic or domain-dependent relationships between the configuration items. 
     In one implementation, the configuration items and the relationships discovered in operation  410  may therefore provide a navigational structure that can be used to automatically assess and report on proposed changes to the datacenter. In particular, a datacenter change request may be created in an operation  420   a  to propose any suitable set of changes to the datacenter. For example, the change request may be created in response to a particular information technology resource experiencing degraded performance or failure, wherein the change request may include one or more proposed changes to the existing resources in the datacenter that have been derived to remedy the degraded performance, failure, or other situation that prompted the proposed changes. In response to deriving the one or more proposed changes to the resources in the datacenter, operation  420   a  may further include identifying one or more human participants required to authorize, agree, or otherwise approve the proposed changes. In one implementation, as will be described in further detail herein, the change request may then be further analyzed to generate decision support information that may be referenced to determine whether the proposed changes are agreeable or otherwise appropriate, wherein the decision support information may include an assessment of the proposed changes that provides the human participants with sufficient information to decide whether the proposed changes can suitably proceed (e.g., as described in co-pending U.S. patent application Ser. No. 12/725,241, entitled “System and Method for Intelligent Workload Management,” filed Mar. 16, 2010, the contents of which are hereby incorporated by reference in their entirety). 
     For example, in one implementation, an operation  430   a  may include analyzing the change request to identify a set of one or more configuration items that the proposed changes will newly add, modify, or otherwise change within the configuration management database. In response to identifying the one or more configuration items, operation  430   a  may further include querying the configuration management database to produce a navigational traversal. In particular, from the identified set of configuration items, the configuration management database may analyze any relationships defined for the configuration items and create a graph data structure that represents the navigational traversal produced from the identified configuration items and any relationships that may be defined for the identified configuration items. For example, in one implementation, the navigational traversal may be produced using similar techniques as described in “A Technical Overview of Novell® CMDB360™,” the contents of which are hereby incorporated by reference in their entirety. In one implementation, the navigational traversal produced from the information stored in the configuration management database may then be combined with various domain-specific inclusions and/or exclusions, which may modify the navigational traversal to remove “noise” or other information that may not be necessary to determine whether or not to authorize or otherwise approve the proposed changes (e.g., a domain-specific inclusion may be defined to include resources in remote datacenters provided by trusted partners). Thus, the navigational traversal produced in operation  430   a  may generally represent a set of navigation pathways that emanate from a start of the navigational traversal to any endpoints that the proposed changes may impact. 
     In one implementation, the navigation pathways derived from the navigational traversal may then be further analyzed in an operation  440   a . In particular, the endpoints that the proposed changes potentially impact may be filtered in operation  440   a  using a datacenter flow and rule engine (alternatively referred to as a “correlation engine” or “rule engine”) that tunes one or more heuristics, policies, or other rules to a particular implementation for the configuration management database (e.g., because a configuration management database often represents a generic construct that can be created or utilized in many different ways). Thus, analyzing the navigation pathways in operation  440   a  may generally include filtering the potentially impacted endpoints identified therein, wherein the filtered set of potentially impacted endpoints may represent an initial assessment of the scope of the potential impacts that the proposed changes may have in the datacenter (i.e., resources in the datacenter that may have their operations impacted due to the proposed changes). In one implementation, an operation  450   a  may then include determining whether any of the potential impacted endpoints include essential or otherwise critical resources. In response to determining that the potentially impacted endpoints include no essential or otherwise critical resources, an operation  480   a  may include automatically implementing the change request in the datacenter (i.e., without any human intervention). In addition, operation  480   a  may further report the impact analysis that resulted in the change request receiving approval for automated implementation. In other words, although the change request may be automatically approved and implemented in response to determining that no essential or critical resources will be impacted, the impact analysis may nonetheless be reported to provide decision support data that corroborates the decision to permit non-human automation (e.g., to provide supplemental information that can be referenced to prove compliance with any organizational or regulatory requirements, derive management knowledge for subsequent change requests having similar characteristics, provide version control or an audit trail for the datacenter over time, etc.). 
     On the other hand, in response to determining in operation  450   a  that the potentially impacted endpoints include one or more essential or critical resources, one or more human participants required to authorize or approve the proposed changes may be identified in an operation  460   a . Thus, in one implementation, an operation  470   a  may include managing a change remediation workflow among the identified human participants to resolve the potential impacts. For example, in one implementation, the change remediation workflow may present graphical reports, multimedia, and/or other interfaces to the human participants required to authorize or approve the proposed changes (e.g., as described in co-pending 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 Mar. 16, 2010, the contents of which are hereby incorporated by reference in their entirety). Accordingly, the change remediation workflow managed in operation  470   a  may provide the human participants with sufficient information to determine whether or not to approve the proposed changes for automated implementation, where the proposed changes may be automatically implemented in operation  480   a  in a similar manner as described above in response to the human participants collaboratively resolving the potential impacts and authorizing or otherwise approving the proposed changes. Alternatively, in response to the human participants rejecting or otherwise determining not to authorize the proposed changes, the proposed changes may be discarded in operation  470   a  without further processing. However, regardless of whether the human participants authorize or reject the proposed changes, the impact analysis and other any processes involved in the change remediation workflow may be reported in operation  480   a  to provide the decision support data that can be audited or referenced to remediate the decision-making process that resulted in the human participants authorizing or rejecting the proposed changes. 
     According to one aspect of the invention,  FIG. 4B  illustrates an exemplary method  400 B for detecting and resolving conflicts that proposed changes may have in a network datacenter. In particular, the method  400 B shown in  FIG. 4B  and described herein may generally operate in a substantially similar manner as described with reference to  FIG. 4A , except that the method  400 B may be used to further detect and remediate potential conflicts between multiple sets of proposed changes to the datacenter. In particular, whereas operation  420   a  in  FIG. 4A  creates one particular datacenter change request, operation  420   b  in  FIG. 4B  may create multiple datacenter requests that include multiple different sets of proposed changes to the datacenter. In one implementation, the multiple change requests may then be analyzed using substantially similar techniques as described in connection with  FIG. 4A , except that the proposed changes may be queued and readied for later execution once any potential impacts on essential or otherwise critical resources have been resolved. For example, one or more of the proposed changes may be queued for execution during off-hours or planned maintenance periods to avoid the potential impacts. Thus, even though multiple different change requests may seem unrelated, potential conflicts may nonetheless arise depending on how the multiple change requests have been queued for execution. 
     As such, in one implementation, an operation  440   b  may include analyzing the navigation pathways produced for the multiple change requests, wherein operation  450   b  may then include determining whether the multiple change requests have any potential conflicts (e.g., where one request includes a change to a particular resource scheduled during weekend maintenance and another request includes a change to a related resource scheduled during the same maintenance period). Thus, multiple sets of proposed changes scheduled for later execution may potentially conflict even though processes performed to assess potential impacts from the multiple sets of proposed changes may not have identified any particular intersection between the multiple change sets. Accordingly, in response to detecting one or more potential conflicts between the multiple change requests (e.g., due to natural tendencies whereby changes are often batched for execution during accepted maintenance windows), an operation  460   b  may trigger an event that stops the potentially conflicting changes from proceeding through automated execution and identifies human change personnel that a remediation or adjustment resolving the potential conflicts must be made, wherein a change remediation workflow among the human participants may then be managed to resolve the potential conflicts in operation  470   b . On the other hand, in response to determining in operation  450   b  that the multiple changes do not have any potential conflicts, the multiple changes may be permitted to proceed automatically according to the defined schedules. However, in either scenario, the conflict analysis and other any processes involved in the change remediation workflow (including any impact analysis) may be reported in operation  480   b  to provide decision support data that corroborates the decisions in automating the change requests or otherwise resolving the potential conflicts. 
     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.