Chapter 20. Configuring ingress cluster traffic 20.1. Configuring ingress cluster traffic overview OpenShift Container Platform provides the following methods for communicating from outside the cluster with services running in the cluster. The methods are recommended, in order or preference: If you have HTTP/HTTPS, use an Ingress Controller. If you have a TLS-encrypted protocol other than HTTPS. For example, for TLS with the SNI header, use an Ingress Controller. Otherwise, use a Load Balancer, an External IP, or a NodePort . Method Purpose Use an Ingress Controller Allows access to HTTP/HTTPS traffic and TLS-encrypted protocols other than HTTPS (for example, TLS with the SNI header). Automatically assign an external IP using a load balancer service Allows traffic to non-standard ports through an IP address assigned from a pool. Most cloud platforms offer a method to start a service with a load-balancer IP address. About MetalLB and the MetalLB Operator Allows traffic to a specific IP address or address from a pool on the machine network. For bare-metal installations or platforms that are like bare metal, MetalLB provides a way to start a service with a load-balancer IP address. Manually assign an external IP to a service Allows traffic to non-standard ports through a specific IP address. Configure a NodePort Expose a service on all nodes in the cluster. 20.1.1. Comparision: Fault tolerant access to external IP addresses For the communication methods that provide access to an external IP address, fault tolerant access to the IP address is another consideration. The following features provide fault tolerant access to an external IP address. IP failover IP failover manages a pool of virtual IP address for a set of nodes. It is implemented with Keepalived and Virtual Router Redundancy Protocol (VRRP). IP failover is a layer 2 mechanism only and relies on multicast. Multicast can have disadvantages for some networks. MetalLB MetalLB has a layer 2 mode, but it does not use multicast. Layer 2 mode has a disadvantage that it transfers all traffic for an external IP address through one node. Manually assigning external IP addresses You can configure your cluster with an IP address block that is used to assign external IP addresses to services. By default, this feature is disabled. This feature is flexible, but places the largest burden on the cluster or network administrator. The cluster is prepared to receive traffic that is destined for the external IP, but each customer has to decide how they want to route traffic to nodes. 20.2. Configuring ExternalIPs for services As a cluster administrator, you can designate an IP address block that is external to the cluster that can send traffic to services in the cluster. This functionality is generally most useful for clusters installed on bare-metal hardware. 20.2.1. Prerequisites Your network infrastructure must route traffic for the external IP addresses to your cluster. 20.2.2. About ExternalIP For non-cloud environments, OpenShift Container Platform supports the use of the ExternalIP facility to specify external IP addresses in the spec.externalIPs[] parameter of the Service object. A service configured with an ExternalIP functions similarly to a service with type=NodePort , whereby you traffic directs to a local node for load balancing. Important For cloud environments, use the load balancer services for automatic deployment of a cloud load balancer to target the endpoints of a service. After you specify a value for the parameter, OpenShift Container Platform assigns an additional virtual IP address to the service. The IP address can exist outside of the service network that you defined for your cluster. Warning Because ExternalIP is disabled by default, enabling the ExternalIP functionality might introduce security risks for the service, because in-cluster traffic to an external IP address is directed to that service. This configuration means that cluster users could intercept sensitive traffic destined for external resources. You can use either a MetalLB implementation or an IP failover deployment to attach an ExternalIP resource to a service in the following ways: Automatic assignment of an external IP OpenShift Container Platform automatically assigns an IP address from the autoAssignCIDRs CIDR block to the spec.externalIPs[] array when you create a Service object with spec.type=LoadBalancer set. For this configuration, OpenShift Container Platform implements a cloud version of the load balancer service type and assigns IP addresses to the services. Automatic assignment is disabled by default and must be configured by a cluster administrator as described in the "Configuration for ExternalIP" section. Manual assignment of an external IP OpenShift Container Platform uses the IP addresses assigned to the spec.externalIPs[] array when you create a Service object. You cannot specify an IP address that is already in use by another service. After using either the MetalLB implementation or an IP failover deployment to host external IP address blocks, you must configure your networking infrastructure to ensure that the external IP address blocks are routed to your cluster. This configuration means that the IP address is not configured in the network interfaces from nodes. To handle the traffic, you must configure the routing and access to the external IP by using a method, such as static Address Resolution Protocol (ARP) entries. OpenShift Container Platform extends the ExternalIP functionality in Kubernetes by adding the following capabilities: Restrictions on the use of external IP addresses by users through a configurable policy Allocation of an external IP address automatically to a service upon request 20.2.3. Additional resources Configuring IP failover About MetalLB and the MetalLB Operator 20.2.4. Configuration for ExternalIP Use of an external IP address in OpenShift Container Platform is governed by the following parameters in the Network.config.openshift.io custom resource (CR) that is named cluster : spec.externalIP.autoAssignCIDRs defines an IP address block used by the load balancer when choosing an external IP address for the service. OpenShift Container Platform supports only a single IP address block for automatic assignment. This configuration requires less steps than manually assigning ExternalIPs to services, which requires managing the port space of a limited number of shared IP addresses. If you enable automatic assignment, a Service object with spec.type=LoadBalancer is allocated an external IP address. spec.externalIP.policy defines the permissible IP address blocks when manually specifying an IP address. OpenShift Container Platform does not apply policy rules to IP address blocks that you defined in the spec.externalIP.autoAssignCIDRs parameter. If routed correctly, external traffic from the configured external IP address block can reach service endpoints through any TCP or UDP port that the service exposes. Important As a cluster administrator, you must configure routing to externalIPs. You must also ensure that the IP address block you assign terminates at one or more nodes in your cluster. For more information, see Kubernetes External IPs . OpenShift Container Platform supports both the automatic and manual assignment of IP addresses, where each address is guaranteed to be assigned to a maximum of one service. This configuration ensures that each service can expose its chosen ports regardless of the ports exposed by other services. Note To use IP address blocks defined by autoAssignCIDRs in OpenShift Container Platform, you must configure the necessary IP address assignment and routing for your host network. The following YAML describes a service with an external IP address configured: Example Service object with spec.externalIPs[] set apiVersion: v1 kind: Service metadata: name: http-service spec: clusterIP: 172.30.163.110 externalIPs: - 192.168.132.253 externalTrafficPolicy: Cluster ports: - name: highport nodePort: 31903 port: 30102 protocol: TCP targetPort: 30102 selector: app: web sessionAffinity: None type: LoadBalancer status: loadBalancer: ingress: - ip: 192.168.132.253 # ... 20.2.5. Restrictions on the assignment of an external IP address As a cluster administrator, you can specify IP address blocks to allow and to reject IP addresses for a service. Restrictions apply only to users without cluster-admin privileges. A cluster administrator can always set the service spec.externalIPs[] field to any IP address. You configure an IP address policy by specifying Classless Inter-Domain Routing (CIDR) address blocks for the spec.ExternalIP.policy parameter in the policy object. Example in JSON form of a policy object and its CIDR parameters { "policy": { "allowedCIDRs": [], "rejectedCIDRs": [] } } When configuring policy restrictions, the following rules apply: If policy is set to {} , creating a Service object with spec.ExternalIPs[] results in a failed service. This setting is the default for OpenShift Container Platform. The same behavior exists for policy: null . If policy is set and either policy.allowedCIDRs[] or policy.rejectedCIDRs[] is set, the following rules apply: If allowedCIDRs[] and rejectedCIDRs[] are both set, rejectedCIDRs[] has precedence over allowedCIDRs[] . If allowedCIDRs[] is set, creating a Service object with spec.ExternalIPs[] succeeds only if the specified IP addresses are allowed. If rejectedCIDRs[] is set, creating a Service object with spec.ExternalIPs[] succeeds only if the specified IP addresses are not rejected. 20.2.6. Example policy objects The examples in this section show different spec.externalIP.policy configurations. In the following example, the policy prevents OpenShift Container Platform from creating any service with a specified external IP address. Example policy to reject any value specified for Service object spec.externalIPs[] apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: externalIP: policy: {} # ... In the following example, both the allowedCIDRs and rejectedCIDRs fields are set. Example policy that includes both allowed and rejected CIDR blocks apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: externalIP: policy: allowedCIDRs: - 172.16.66.10/23 rejectedCIDRs: - 172.16.66.10/24 # ... In the following example, policy is set to {} . With this configuration, using the oc get networks.config.openshift.io -o yaml command to view the configuration means policy parameter does not show on the command output. The same behavior exists for policy: null . Example policy to allow any value specified for Service object spec.externalIPs[] apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: clusterNetwork: - cidr: 10.128.0.0/14 hostPrefix: 23 externalIP: policy: {} # ... 20.2.7. ExternalIP address block configuration The configuration for ExternalIP address blocks is defined by a Network custom resource (CR) named cluster . The Network CR is part of the config.openshift.io API group. Important During cluster installation, the Cluster Version Operator (CVO) automatically creates a Network CR named cluster . Creating any other CR objects of this type is not supported. The following YAML describes the ExternalIP configuration: Network.config.openshift.io CR named cluster apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: externalIP: autoAssignCIDRs: [] 1 policy: 2 ... 1 Defines the IP address block in CIDR format that is available for automatic assignment of external IP addresses to a service. Only a single IP address range is allowed. 2 Defines restrictions on manual assignment of an IP address to a service. If no restrictions are defined, specifying the spec.externalIP field in a Service object is not allowed. By default, no restrictions are defined. The following YAML describes the fields for the policy stanza: Network.config.openshift.io policy stanza policy: allowedCIDRs: [] 1 rejectedCIDRs: [] 2 1 A list of allowed IP address ranges in CIDR format. 2 A list of rejected IP address ranges in CIDR format. Example external IP configurations Several possible configurations for external IP address pools are displayed in the following examples: The following YAML describes a configuration that enables automatically assigned external IP addresses: Example configuration with spec.externalIP.autoAssignCIDRs set apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: ... externalIP: autoAssignCIDRs: - 192.168.132.254/29 The following YAML configures policy rules for the allowed and rejected CIDR ranges: Example configuration with spec.externalIP.policy set apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: ... externalIP: policy: allowedCIDRs: - 192.168.132.0/29 - 192.168.132.8/29 rejectedCIDRs: - 192.168.132.7/32 20.2.8. Configure external IP address blocks for your cluster As a cluster administrator, you can configure the following ExternalIP settings: An ExternalIP address block used by OpenShift Container Platform to automatically populate the spec.clusterIP field for a Service object. A policy object to restrict what IP addresses may be manually assigned to the spec.clusterIP array of a Service object. Prerequisites Install the OpenShift CLI ( oc ). Access to the cluster as a user with the cluster-admin role. Procedure Optional: To display the current external IP configuration, enter the following command: USD oc describe networks.config cluster To edit the configuration, enter the following command: USD oc edit networks.config cluster Modify the ExternalIP configuration, as in the following example: apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: ... externalIP: 1 ... 1 Specify the configuration for the externalIP stanza. To confirm the updated ExternalIP configuration, enter the following command: USD oc get networks.config cluster -o go-template='{{.spec.externalIP}}{{"\n"}}' 20.2.9. steps Configuring ingress cluster traffic for a service external IP 20.3. Configuring ingress cluster traffic using an Ingress Controller OpenShift Container Platform provides methods for communicating from outside the cluster with services running in the cluster. This method uses an Ingress Controller. 20.3.1. Using Ingress Controllers and routes The Ingress Operator manages Ingress Controllers and wildcard DNS. Using an Ingress Controller is the most common way to allow external access to an OpenShift Container Platform cluster. An Ingress Controller is configured to accept external requests and proxy them based on the configured routes. This is limited to HTTP, HTTPS using SNI, and TLS using SNI, which is sufficient for web applications and services that work over TLS with SNI. Work with your administrator to configure an Ingress Controller to accept external requests and proxy them based on the configured routes. The administrator can create a wildcard DNS entry and then set up an Ingress Controller. Then, you can work with the edge Ingress Controller without having to contact the administrators. By default, every Ingress Controller in the cluster can admit any route created in any project in the cluster. The Ingress Controller: Has two replicas by default, which means it should be running on two worker nodes. Can be scaled up to have more replicas on more nodes. Note The procedures in this section require prerequisites performed by the cluster administrator. 20.3.2. Prerequisites Before starting the following procedures, the administrator must: Set up the external port to the cluster networking environment so that requests can reach the cluster. Make sure there is at least one user with cluster admin role. To add this role to a user, run the following command: You have an OpenShift Container Platform cluster with at least one master and at least one node and a system outside the cluster that has network access to the cluster. This procedure assumes that the external system is on the same subnet as the cluster. The additional networking required for external systems on a different subnet is out-of-scope for this topic. 20.3.3. Creating a project and service If the project and service that you want to expose does not exist, create the project and then create the service. If the project and service already exists, skip to the procedure on exposing the service to create a route. Prerequisites Install the OpenShift CLI ( oc ) and log in as a cluster administrator. Procedure Create a new project for your service by running the oc new-project command: USD oc new-project <project_name> Use the oc new-app command to create your service: USD oc new-app nodejs:12~https://github.com/sclorg/nodejs-ex.git To verify that the service was created, run the following command: USD oc get svc -n <project_name> Example output NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nodejs-ex ClusterIP 172.30.197.157 <none> 8080/TCP 70s Note By default, the new service does not have an external IP address. 20.3.4. Exposing the service by creating a route You can expose the service as a route by using the oc expose command. Prerequisites You logged into OpenShift Container Platform. Procedure Log in to the project where the service you want to expose is located: USD oc project <project_name> Run the oc expose service command to expose the route: USD oc expose service nodejs-ex Example output route.route.openshift.io/nodejs-ex exposed To verify that the service is exposed, you can use a tool, such as curl to check that the service is accessible from outside the cluster. To find the hostname of the route, enter the following command: USD oc get route Example output NAME HOST/PORT PATH SERVICES PORT TERMINATION WILDCARD nodejs-ex nodejs-ex-myproject.example.com nodejs-ex 8080-tcp None To check that the host responds to a GET request, enter the following command: Example curl command USD curl --head nodejs-ex-myproject.example.com Example output HTTP/1.1 200 OK ... 20.3.5. Ingress sharding in OpenShift Container Platform In OpenShift Container Platform, an Ingress Controller can serve all routes, or it can serve a subset of routes. By default, the Ingress Controller serves any route created in any namespace in the cluster. You can add additional Ingress Controllers to your cluster to optimize routing by creating shards , which are subsets of routes based on selected characteristics. To mark a route as a member of a shard, use labels in the route or namespace metadata field. The Ingress Controller uses selectors , also known as a selection expression , to select a subset of routes from the entire pool of routes to serve. Ingress sharding is useful in cases where you want to load balance incoming traffic across multiple Ingress Controllers, when you want to isolate traffic to be routed to a specific Ingress Controller, or for a variety of other reasons described in the section. By default, each route uses the default domain of the cluster. However, routes can be configured to use the domain of the router instead. 20.3.6. Ingress Controller sharding You can use Ingress sharding, also known as router sharding, to distribute a set of routes across multiple routers by adding labels to routes, namespaces, or both. The Ingress Controller uses a corresponding set of selectors to admit only the routes that have a specified label. Each Ingress shard comprises the routes that are filtered by using a given selection expression. As the primary mechanism for traffic to enter the cluster, the demands on the Ingress Controller can be significant. As a cluster administrator, you can shard the routes to: Balance Ingress Controllers, or routers, with several routes to accelerate responses to changes. Assign certain routes to have different reliability guarantees than other routes. Allow certain Ingress Controllers to have different policies defined. Allow only specific routes to use additional features. Expose different routes on different addresses so that internal and external users can see different routes, for example. Transfer traffic from one version of an application to another during a blue-green deployment. When Ingress Controllers are sharded, a given route is admitted to zero or more Ingress Controllers in the group. The status of a route describes whether an Ingress Controller has admitted the route. An Ingress Controller only admits a route if the route is unique to a shard. With sharding, you can distribute subsets of routes over multiple Ingress Controllers. These subsets can be nonoverlapping, also called traditional sharding, or overlapping, otherwise known as overlapped sharding. The following table outlines three sharding methods: Sharding method Description Namespace selector After you add a namespace selector to the Ingress Controller, all routes in a namespace that have matching labels for the namespace selector are included in the Ingress shard. Consider this method when an Ingress Controller serves all routes created in a namespace. Route selector After you add a route selector to the Ingress Controller, all routes with labels that match the route selector are included in the Ingress shard. Consider this method when you want an Ingress Controller to serve only a subset of routes or a specific route in a namespace. Namespace and route selectors Provides your Ingress Controller scope for both namespace selector and route selector methods. Consider this method when you want the flexibility of both the namespace selector and the route selector methods. 20.3.6.1. Traditional sharding example An example of a configured Ingress Controller finops-router that has the label selector spec.namespaceSelector.matchExpressions with key values set to finance and ops : Example YAML definition for finops-router apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: finops-router namespace: openshift-ingress-operator spec: namespaceSelector: matchExpressions: - key: name operator: In values: - finance - ops An example of a configured Ingress Controller dev-router that has the label selector spec.namespaceSelector.matchLabels.name with the key value set to dev : Example YAML definition for dev-router apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: dev-router namespace: openshift-ingress-operator spec: namespaceSelector: matchLabels: name: dev If all application routes are in separate namespaces, such as each labeled with name:finance , name:ops , and name:dev , the configuration effectively distributes your routes between the two Ingress Controllers. OpenShift Container Platform routes for console, authentication, and other purposes should not be handled. In the scenario, sharding becomes a special case of partitioning, with no overlapping subsets. Routes are divided between router shards. Warning The default Ingress Controller continues to serve all routes unless the namespaceSelector or routeSelector fields contain routes that are meant for exclusion. See this Red Hat Knowledgebase solution and the section "Sharding the default Ingress Controller" for more information on how to exclude routes from the default Ingress Controller. 20.3.6.2. Overlapped sharding example An example of a configured Ingress Controller devops-router that has the label selector spec.namespaceSelector.matchExpressions with key values set to dev and ops : Example YAML definition for devops-router apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: devops-router namespace: openshift-ingress-operator spec: namespaceSelector: matchExpressions: - key: name operator: In values: - dev - ops The routes in the namespaces labeled name:dev and name:ops are now serviced by two different Ingress Controllers. With this configuration, you have overlapping subsets of routes. With overlapping subsets of routes you can create more complex routing rules. For example, you can divert higher priority traffic to the dedicated finops-router while sending lower priority traffic to devops-router . 20.3.6.3. Sharding the default Ingress Controller After creating a new Ingress shard, there might be routes that are admitted to your new Ingress shard that are also admitted by the default Ingress Controller. This is because the default Ingress Controller has no selectors and admits all routes by default. You can restrict an Ingress Controller from servicing routes with specific labels using either namespace selectors or route selectors. The following procedure restricts the default Ingress Controller from servicing your newly sharded finance , ops , and dev , routes using a namespace selector. This adds further isolation to Ingress shards. Important You must keep all of OpenShift Container Platform's administration routes on the same Ingress Controller. Therefore, avoid adding additional selectors to the default Ingress Controller that exclude these essential routes. Prerequisites You installed the OpenShift CLI ( oc ). You are logged in as a project administrator. Procedure Modify the default Ingress Controller by running the following command: USD oc edit ingresscontroller -n openshift-ingress-operator default Edit the Ingress Controller to contain a namespaceSelector that excludes the routes with any of the finance , ops , and dev labels: apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: default namespace: openshift-ingress-operator spec: namespaceSelector: matchExpressions: - key: name operator: NotIn values: - finance - ops - dev The default Ingress Controller will no longer serve the namespaces labeled name:finance , name:ops , and name:dev . 20.3.6.4. Ingress sharding and DNS The cluster administrator is responsible for making a separate DNS entry for each router in a project. A router will not forward unknown routes to another router. Consider the following example: Router A lives on host 192.168.0.5 and has routes with *.foo.com . Router B lives on host 192.168.1.9 and has routes with *.example.com . Separate DNS entries must resolve *.foo.com to the node hosting Router A and *.example.com to the node hosting Router B: *.foo.com A IN 192.168.0.5 *.example.com A IN 192.168.1.9 20.3.6.5. Configuring Ingress Controller sharding by using route labels Ingress Controller sharding by using route labels means that the Ingress Controller serves any route in any namespace that is selected by the route selector. Figure 20.1. Ingress sharding using route labels Ingress Controller sharding is useful when balancing incoming traffic load among a set of Ingress Controllers and when isolating traffic to a specific Ingress Controller. For example, company A goes to one Ingress Controller and company B to another. Procedure Edit the router-internal.yaml file: apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: sharded namespace: openshift-ingress-operator spec: domain: <apps-sharded.basedomain.example.net> 1 nodePlacement: nodeSelector: matchLabels: node-role.kubernetes.io/worker: "" routeSelector: matchLabels: type: sharded 1 Specify a domain to be used by the Ingress Controller. This domain must be different from the default Ingress Controller domain. Apply the Ingress Controller router-internal.yaml file: # oc apply -f router-internal.yaml The Ingress Controller selects routes in any namespace that have the label type: sharded . Create a new route using the domain configured in the router-internal.yaml : USD oc expose svc <service-name> --hostname <route-name>.apps-sharded.basedomain.example.net 20.3.6.6. Configuring Ingress Controller sharding by using namespace labels Ingress Controller sharding by using namespace labels means that the Ingress Controller serves any route in any namespace that is selected by the namespace selector. Figure 20.2. Ingress sharding using namespace labels Ingress Controller sharding is useful when balancing incoming traffic load among a set of Ingress Controllers and when isolating traffic to a specific Ingress Controller. For example, company A goes to one Ingress Controller and company B to another. Procedure Edit the router-internal.yaml file: USD cat router-internal.yaml Example output apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: sharded namespace: openshift-ingress-operator spec: domain: <apps-sharded.basedomain.example.net> 1 nodePlacement: nodeSelector: matchLabels: node-role.kubernetes.io/worker: "" namespaceSelector: matchLabels: type: sharded 1 Specify a domain to be used by the Ingress Controller. This domain must be different from the default Ingress Controller domain. Apply the Ingress Controller router-internal.yaml file: USD oc apply -f router-internal.yaml The Ingress Controller selects routes in any namespace that is selected by the namespace selector that have the label type: sharded . Create a new route using the domain configured in the router-internal.yaml : USD oc expose svc <service-name> --hostname <route-name>.apps-sharded.basedomain.example.net 20.3.6.7. Creating a route for Ingress Controller sharding A route allows you to host your application at a URL. In this case, the hostname is not set and the route uses a subdomain instead. When you specify a subdomain, you automatically use the domain of the Ingress Controller that exposes the route. For situations where a route is exposed by multiple Ingress Controllers, the route is hosted at multiple URLs. The following procedure describes how to create a route for Ingress Controller sharding, using the hello-openshift application as an example. Ingress Controller sharding is useful when balancing incoming traffic load among a set of Ingress Controllers and when isolating traffic to a specific Ingress Controller. For example, company A goes to one Ingress Controller and company B to another. Prerequisites You installed the OpenShift CLI ( oc ). You are logged in as a project administrator. You have a web application that exposes a port and an HTTP or TLS endpoint listening for traffic on the port. You have configured the Ingress Controller for sharding. Procedure Create a project called hello-openshift by running the following command: USD oc new-project hello-openshift Create a pod in the project by running the following command: USD oc create -f https://raw.githubusercontent.com/openshift/origin/master/examples/hello-openshift/hello-pod.json Create a service called hello-openshift by running the following command: USD oc expose pod/hello-openshift Create a route definition called hello-openshift-route.yaml : YAML definition of the created route for sharding apiVersion: route.openshift.io/v1 kind: Route metadata: labels: type: sharded 1 name: hello-openshift-edge namespace: hello-openshift spec: subdomain: hello-openshift 2 tls: termination: edge to: kind: Service name: hello-openshift 1 Both the label key and its corresponding label value must match the ones specified in the Ingress Controller. In this example, the Ingress Controller has the label key and value type: sharded . 2 The route will be exposed using the value of the subdomain field. When you specify the subdomain field, you must leave the hostname unset. If you specify both the host and subdomain fields, then the route will use the value of the host field, and ignore the subdomain field. Use hello-openshift-route.yaml to create a route to the hello-openshift application by running the following command: USD oc -n hello-openshift create -f hello-openshift-route.yaml Verification Get the status of the route with the following command: USD oc -n hello-openshift get routes/hello-openshift-edge -o yaml The resulting Route resource should look similar to the following: Example output apiVersion: route.openshift.io/v1 kind: Route metadata: labels: type: sharded name: hello-openshift-edge namespace: hello-openshift spec: subdomain: hello-openshift tls: termination: edge to: kind: Service name: hello-openshift status: ingress: - host: hello-openshift.<apps-sharded.basedomain.example.net> 1 routerCanonicalHostname: router-sharded.<apps-sharded.basedomain.example.net> 2 routerName: sharded 3 1 The hostname the Ingress Controller, or router, uses to expose the route. The value of the host field is automatically determined by the Ingress Controller, and uses its domain. In this example, the domain of the Ingress Controller is <apps-sharded.basedomain.example.net> . 2 The hostname of the Ingress Controller. 3 The name of the Ingress Controller. In this example, the Ingress Controller has the name sharded . Additional resources Baseline Ingress Controller (router) performance Configuring the Ingress Controller Installing a cluster on bare metal Installing a cluster on vSphere About network policy 20.4. Configuring the Ingress Controller endpoint publishing strategy The endpointPublishingStrategy is used to publish the Ingress Controller endpoints to other networks, enable load balancer integrations, and provide access to other systems. Important On Red Hat OpenStack Platform (RHOSP), the LoadBalancerService endpoint publishing strategy is supported only if a cloud provider is configured to create health monitors. For RHOSP 16.2, this strategy is possible only if you use the Amphora Octavia provider. For more information, see the "Setting RHOSP Cloud Controller Manager options" section of the RHOSP installation documentation. 20.4.1. Ingress Controller endpoint publishing strategy NodePortService endpoint publishing strategy The NodePortService endpoint publishing strategy publishes the Ingress Controller using a Kubernetes NodePort service. In this configuration, the Ingress Controller deployment uses container networking. A NodePortService is created to publish the deployment. The specific node ports are dynamically allocated by OpenShift Container Platform; however, to support static port allocations, your changes to the node port field of the managed NodePortService are preserved. Figure 20.3. Diagram of NodePortService The preceding graphic shows the following concepts pertaining to OpenShift Container Platform Ingress NodePort endpoint publishing strategy: All the available nodes in the cluster have their own, externally accessible IP addresses. The service running in the cluster is bound to the unique NodePort for all the nodes. When the client connects to a node that is down, for example, by connecting the 10.0.128.4 IP address in the graphic, the node port directly connects the client to an available node that is running the service. In this scenario, no load balancing is required. As the image shows, the 10.0.128.4 address is down and another IP address must be used instead. Note The Ingress Operator ignores any updates to .spec.ports[].nodePort fields of the service. By default, ports are allocated automatically and you can access the port allocations for integrations. However, sometimes static port allocations are necessary to integrate with existing infrastructure which may not be easily reconfigured in response to dynamic ports. To achieve integrations with static node ports, you can update the managed service resource directly. For more information, see the Kubernetes Services documentation on NodePort . HostNetwork endpoint publishing strategy The HostNetwork endpoint publishing strategy publishes the Ingress Controller on node ports where the Ingress Controller is deployed. An Ingress Controller with the HostNetwork endpoint publishing strategy can have only one pod replica per node. If you want n replicas, you must use at least n nodes where those replicas can be scheduled. Because each pod replica requests ports 80 and 443 on the node host where it is scheduled, a replica cannot be scheduled to a node if another pod on the same node is using those ports. The HostNetwork object has a hostNetwork field with the following default values for the optional binding ports: httpPort: 80 , httpsPort: 443 , and statsPort: 1936 . By specifying different binding ports for your network, you can deploy multiple Ingress Controllers on the same node for the HostNetwork strategy. Example apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: internal namespace: openshift-ingress-operator spec: domain: example.com endpointPublishingStrategy: type: HostNetwork hostNetwork: httpPort: 80 httpsPort: 443 statsPort: 1936 20.4.1.1. Configuring the Ingress Controller endpoint publishing scope to Internal When a cluster administrator installs a new cluster without specifying that the cluster is private, the default Ingress Controller is created with a scope set to External . Cluster administrators can change an External scoped Ingress Controller to Internal . Prerequisites You installed the oc CLI. Procedure To change an External scoped Ingress Controller to Internal , enter the following command: USD oc -n openshift-ingress-operator patch ingresscontrollers/default --type=merge --patch='{"spec":{"endpointPublishingStrategy":{"type":"LoadBalancerService","loadBalancer":{"scope":"Internal"}}}}' To check the status of the Ingress Controller, enter the following command: USD oc -n openshift-ingress-operator get ingresscontrollers/default -o yaml The Progressing status condition indicates whether you must take further action. For example, the status condition can indicate that you need to delete the service by entering the following command: USD oc -n openshift-ingress delete services/router-default If you delete the service, the Ingress Operator recreates it as Internal . 20.4.1.2. Configuring the Ingress Controller endpoint publishing scope to External When a cluster administrator installs a new cluster without specifying that the cluster is private, the default Ingress Controller is created with a scope set to External . The Ingress Controller's scope can be configured to be Internal during installation or after, and cluster administrators can change an Internal Ingress Controller to External . Important On some platforms, it is necessary to delete and recreate the service. Changing the scope can cause disruption to Ingress traffic, potentially for several minutes. This applies to platforms where it is necessary to delete and recreate the service, because the procedure can cause OpenShift Container Platform to deprovision the existing service load balancer, provision a new one, and update DNS. Prerequisites You installed the oc CLI. Procedure To change an Internal scoped Ingress Controller to External , enter the following command: USD oc -n openshift-ingress-operator patch ingresscontrollers/private --type=merge --patch='{"spec":{"endpointPublishingStrategy":{"type":"LoadBalancerService","loadBalancer":{"scope":"External"}}}}' To check the status of the Ingress Controller, enter the following command: USD oc -n openshift-ingress-operator get ingresscontrollers/default -o yaml The Progressing status condition indicates whether you must take further action. For example, the status condition can indicate that you need to delete the service by entering the following command: USD oc -n openshift-ingress delete services/router-default If you delete the service, the Ingress Operator recreates it as External . 20.4.1.3. Adding a single NodePort service to an Ingress Controller Instead of creating a NodePort -type Service for each project, you can create a custom Ingress Controller to use the NodePortService endpoint publishing strategy. To prevent port conflicts, consider this configuration for your Ingress Controller when you want to apply a set of routes, through Ingress sharding, to nodes that might already have a HostNetwork Ingress Controller. Before you set a NodePort -type Service for each project, read the following considerations: You must create a wildcard DNS record for the Nodeport Ingress Controller domain. A Nodeport Ingress Controller route can be reached from the address of a worker node. For more information about the required DNS records for routes, see "User-provisioned DNS requirements". You must expose a route for your service and specify the --hostname argument for your custom Ingress Controller domain. You must append the port that is assigned to the NodePort -type Service in the route so that you can access application pods. Prerequisites You installed the OpenShift CLI ( oc ). Logged in as a user with cluster-admin privileges. You created a wildcard DNS record. Procedure Create a custom resource (CR) file for the Ingress Controller: Example of a CR file that defines information for the IngressController object apiVersion: v1 items: - apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: <custom_ic_name> 1 namespace: openshift-ingress-operator spec: replicas: 1 domain: <custom_ic_domain_name> 2 nodePlacement: nodeSelector: matchLabels: <key>: <value> 3 namespaceSelector: matchLabels: <key>: <value> 4 endpointPublishingStrategy: type: NodePortService # ... 1 Specify the a custom name for the IngressController CR. 2 The DNS name that the Ingress Controller services. As an example, the default ingresscontroller domain is apps.ipi-cluster.example.com , so you would specify the <custom_ic_domain_name> as nodeportsvc.ipi-cluster.example.com . 3 Specify the label for the nodes that include the custom Ingress Controller. 4 Specify the label for a set of namespaces. Substitute <key>:<value> with a map of key-value pairs where <key> is a unique name for the new label and <value> is its value. For example: ingresscontroller: custom-ic . Add a label to a node by using the oc label node command: USD oc label node <node_name> <key>=<value> 1 1 Where <value> must match the key-value pair specified in the nodePlacement section of your IngressController CR. Create the IngressController object: USD oc create -f <ingress_controller_cr>.yaml Find the port for the service created for the IngressController CR: USD oc get svc -n openshift-ingress Example output that shows port 80:32432/TCP for the router-nodeport-custom-ic3 service NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE router-internal-default ClusterIP 172.30.195.74 <none> 80/TCP,443/TCP,1936/TCP 223d router-nodeport-custom-ic3 NodePort 172.30.109.219 <none> 80:32432/TCP,443:31366/TCP,1936:30499/TCP 155m To create a new project, enter the following command: USD oc new-project <project_name> To label the new namespace, enter the following command: USD oc label namespace <project_name> <key>=<value> 1 1 Where <key>=<value> must match the value in the namespaceSelector section of your Ingress Controller CR. Create a new application in your cluster: USD oc new-app --image=<image_name> 1 1 An example of <image_name> is quay.io/openshifttest/hello-openshift:multiarch . Create a Route object for a service, so that the pod can use the service to expose the application external to the cluster. USD oc expose svc/<service_name> --hostname=<svc_name>-<project_name>.<custom_ic_domain_name> 1 Note You must specify the domain name of your custom Ingress Controller in the --hostname argument. If you do not do this, the Ingress Operator uses the default Ingress Controller to serve all the routes for your cluster. Check that the route has the Admitted status and that it includes metadata for the custom Ingress Controller: USD oc get route/hello-openshift -o json | jq '.status.ingress' Example output # ... { "conditions": [ { "lastTransitionTime": "2024-05-17T18:25:41Z", "status": "True", "type": "Admitted" } ], [ { "host": "hello-openshift.nodeportsvc.ipi-cluster.example.com", "routerCanonicalHostname": "router-nodeportsvc.nodeportsvc.ipi-cluster.example.com", "routerName": "nodeportsvc", "wildcardPolicy": "None" } ], } Update the default IngressController CR to prevent the default Ingress Controller from managing the NodePort -type Service . The default Ingress Controller will continue to monitor all other cluster traffic. USD oc patch --type=merge -n openshift-ingress-operator ingresscontroller/default --patch '{"spec":{"namespaceSelector":{"matchExpressions":[{"key":"<key>","operator":"NotIn","values":["<value>]}]}}}' Verification Verify that the DNS entry can route inside and outside of your cluster by entering the following command. The command outputs the IP address of the node that received the label from running the oc label node command earlier in the procedure. USD dig +short <svc_name>-<project_name>.<custom_ic_domain_name> To verify that your cluster uses the IP addresses from external DNS servers for DNS resolution, check the connection of your cluster by entering the following command: USD curl <svc_name>-<project_name>.<custom_ic_domain_name>:<port> 1 1 1 Where <port> is the node port from the NodePort -type Service . Based on example output from the oc get svc -n openshift-ingress command, the 80:32432/TCP HTTP route means that 32432 is the node port. Output example Hello OpenShift! 20.4.2. Additional resources Ingress Controller configuration parameters Setting RHOSP Cloud Controller Manager options User-provisioned DNS requirements 20.5. Configuring ingress cluster traffic using a load balancer OpenShift Container Platform provides methods for communicating from outside the cluster with services running in the cluster. This method uses a load balancer. 20.5.1. Using a load balancer to get traffic into the cluster If you do not need a specific external IP address, you can configure a load balancer service to allow external access to an OpenShift Container Platform cluster. A load balancer service allocates a unique IP. The load balancer has a single edge router IP, which can be a virtual IP (VIP), but is still a single machine for initial load balancing. Note If a pool is configured, it is done at the infrastructure level, not by a cluster administrator. Note The procedures in this section require prerequisites performed by the cluster administrator. 20.5.2. Prerequisites Before starting the following procedures, the administrator must: Set up the external port to the cluster networking environment so that requests can reach the cluster. Make sure there is at least one user with cluster admin role. To add this role to a user, run the following command: Have an OpenShift Container Platform cluster with at least one master and at least one node and a system outside the cluster that has network access to the cluster. This procedure assumes that the external system is on the same subnet as the cluster. The additional networking required for external systems on a different subnet is out-of-scope for this topic. 20.5.3. Creating a project and service If the project and service that you want to expose does not exist, create the project and then create the service. If the project and service already exists, skip to the procedure on exposing the service to create a route. Prerequisites Install the OpenShift CLI ( oc ) and log in as a cluster administrator. Procedure Create a new project for your service by running the oc new-project command: USD oc new-project <project_name> Use the oc new-app command to create your service: USD oc new-app nodejs:12~https://github.com/sclorg/nodejs-ex.git To verify that the service was created, run the following command: USD oc get svc -n <project_name> Example output NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nodejs-ex ClusterIP 172.30.197.157 <none> 8080/TCP 70s Note By default, the new service does not have an external IP address. 20.5.4. Exposing the service by creating a route You can expose the service as a route by using the oc expose command. Prerequisites You logged into OpenShift Container Platform. Procedure Log in to the project where the service you want to expose is located: USD oc project <project_name> Run the oc expose service command to expose the route: USD oc expose service nodejs-ex Example output route.route.openshift.io/nodejs-ex exposed To verify that the service is exposed, you can use a tool, such as curl to check that the service is accessible from outside the cluster. To find the hostname of the route, enter the following command: USD oc get route Example output NAME HOST/PORT PATH SERVICES PORT TERMINATION WILDCARD nodejs-ex nodejs-ex-myproject.example.com nodejs-ex 8080-tcp None To check that the host responds to a GET request, enter the following command: Example curl command USD curl --head nodejs-ex-myproject.example.com Example output HTTP/1.1 200 OK ... 20.5.5. Creating a load balancer service Use the following procedure to create a load balancer service. Prerequisites Make sure that the project and service you want to expose exist. Your cloud provider supports load balancers. Procedure To create a load balancer service: Log in to OpenShift Container Platform. Load the project where the service you want to expose is located. USD oc project project1 Open a text file on the control plane node and paste the following text, editing the file as needed: Sample load balancer configuration file 1 Enter a descriptive name for the load balancer service. 2 Enter the same port that the service you want to expose is listening on. 3 Enter a list of specific IP addresses to restrict traffic through the load balancer. This field is ignored if the cloud-provider does not support the feature. 4 Enter Loadbalancer as the type. 5 Enter the name of the service. Note To restrict the traffic through the load balancer to specific IP addresses, it is recommended to use the Ingress Controller field spec.endpointPublishingStrategy.loadBalancer.allowedSourceRanges . Do not set the loadBalancerSourceRanges field. Save and exit the file. Run the following command to create the service: USD oc create -f <file-name> For example: USD oc create -f mysql-lb.yaml Execute the following command to view the new service: USD oc get svc Example output NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE egress-2 LoadBalancer 172.30.22.226 ad42f5d8b303045-487804948.example.com 3306:30357/TCP 15m The service has an external IP address automatically assigned if there is a cloud provider enabled. On the master, use a tool, such as cURL, to make sure you can reach the service using the public IP address: USD curl <public-ip>:<port> For example: USD curl 172.29.121.74:3306 The examples in this section use a MySQL service, which requires a client application. If you get a string of characters with the Got packets out of order message, you are connecting with the service: If you have a MySQL client, log in with the standard CLI command: USD mysql -h 172.30.131.89 -u admin -p Example output Enter password: Welcome to the MariaDB monitor. Commands end with ; or \g. MySQL [(none)]> 20.6. Configuring ingress cluster traffic on AWS OpenShift Container Platform provides methods for communicating from outside the cluster with services running in the cluster. This method uses load balancers on AWS, specifically a Network Load Balancer (NLB) or a Classic Load Balancer (CLB). Both types of load balancers can forward the client's IP address to the node, but a CLB requires proxy protocol support, which OpenShift Container Platform automatically enables. There are two ways to configure an Ingress Controller to use an NLB: By force replacing the Ingress Controller that is currently using a CLB. This deletes the IngressController object and an outage will occur while the new DNS records propagate and the NLB is being provisioned. By editing an existing Ingress Controller that uses a CLB to use an NLB. This changes the load balancer without having to delete and recreate the IngressController object. Both methods can be used to switch from an NLB to a CLB. You can configure these load balancers on a new or existing AWS cluster. 20.6.1. Configuring Classic Load Balancer timeouts on AWS OpenShift Container Platform provides a method for setting a custom timeout period for a specific route or Ingress Controller. Additionally, an AWS Classic Load Balancer (CLB) has its own timeout period with a default time of 60 seconds. If the timeout period of the CLB is shorter than the route timeout or Ingress Controller timeout, the load balancer can prematurely terminate the connection. You can prevent this problem by increasing both the timeout period of the route and CLB. 20.6.1.1. Configuring route timeouts You can configure the default timeouts for an existing route when you have services in need of a low timeout, which is required for Service Level Availability (SLA) purposes, or a high timeout, for cases with a slow back end. Prerequisites You need a deployed Ingress Controller on a running cluster. Procedure Using the oc annotate command, add the timeout to the route: USD oc annotate route <route_name> \ --overwrite haproxy.router.openshift.io/timeout=<timeout><time_unit> 1 1 Supported time units are microseconds (us), milliseconds (ms), seconds (s), minutes (m), hours (h), or days (d). The following example sets a timeout of two seconds on a route named myroute : USD oc annotate route myroute --overwrite haproxy.router.openshift.io/timeout=2s 20.6.1.2. Configuring Classic Load Balancer timeouts You can configure the default timeouts for a Classic Load Balancer (CLB) to extend idle connections. Prerequisites You must have a deployed Ingress Controller on a running cluster. Procedure Set an AWS connection idle timeout of five minutes for the default ingresscontroller by running the following command: USD oc -n openshift-ingress-operator patch ingresscontroller/default \ --type=merge --patch='{"spec":{"endpointPublishingStrategy": \ {"type":"LoadBalancerService", "loadBalancer": \ {"scope":"External", "providerParameters":{"type":"AWS", "aws": \ {"type":"Classic", "classicLoadBalancer": \ {"connectionIdleTimeout":"5m"}}}}}}}' Optional: Restore the default value of the timeout by running the following command: USD oc -n openshift-ingress-operator patch ingresscontroller/default \ --type=merge --patch='{"spec":{"endpointPublishingStrategy": \ {"loadBalancer":{"providerParameters":{"aws":{"classicLoadBalancer": \ {"connectionIdleTimeout":null}}}}}}}' Note You must specify the scope field when you change the connection timeout value unless the current scope is already set. When you set the scope field, you do not need to do so again if you restore the default timeout value. 20.6.2. Configuring ingress cluster traffic on AWS using a Network Load Balancer OpenShift Container Platform provides methods for communicating from outside the cluster with services that run in the cluster. One such method uses a Network Load Balancer (NLB). You can configure an NLB on a new or existing AWS cluster. 20.6.2.1. Switching the Ingress Controller from using a Classic Load Balancer to a Network Load Balancer You can switch the Ingress Controller that is using a Classic Load Balancer (CLB) to one that uses a Network Load Balancer (NLB) on AWS. Switching between these load balancers will not delete the IngressController object. Warning This procedure might cause the following issues: An outage that can last several minutes due to new DNS records propagation, new load balancers provisioning, and other factors. IP addresses and canonical names of the Ingress Controller load balancer might change after applying this procedure. Leaked load balancer resources due to a change in the annotation of the service. Procedure Modify the existing Ingress Controller that you want to switch to using an NLB. This example assumes that your default Ingress Controller has an External scope and no other customizations: Example ingresscontroller.yaml file apiVersion: operator.openshift.io/v1 kind: IngressController metadata: creationTimestamp: null name: default namespace: openshift-ingress-operator spec: endpointPublishingStrategy: loadBalancer: scope: External providerParameters: type: AWS aws: type: NLB type: LoadBalancerService Note If you do not specify a value for the spec.endpointPublishingStrategy.loadBalancer.providerParameters.aws.type field, the Ingress Controller uses the spec.loadBalancer.platform.aws.type value from the cluster Ingress configuration that was set during installation. Tip If your Ingress Controller has other customizations that you want to update, such as changing the domain, consider force replacing the Ingress Controller definition file instead. Apply the changes to the Ingress Controller YAML file by running the command: USD oc apply -f ingresscontroller.yaml Expect several minutes of outages while the Ingress Controller updates. 20.6.2.2. Switching the Ingress Controller from using a Network Load Balancer to a Classic Load Balancer You can switch the Ingress Controller that is using a Network Load Balancer (NLB) to one that uses a Classic Load Balancer (CLB) on AWS. Switching between these load balancers will not delete the IngressController object. Warning This procedure might cause an outage that can last several minutes due to new DNS records propagation, new load balancers provisioning, and other factors. IP addresses and canonical names of the Ingress Controller load balancer might change after applying this procedure. Procedure Modify the existing Ingress Controller that you want to switch to using a CLB. This example assumes that your default Ingress Controller has an External scope and no other customizations: Example ingresscontroller.yaml file apiVersion: operator.openshift.io/v1 kind: IngressController metadata: creationTimestamp: null name: default namespace: openshift-ingress-operator spec: endpointPublishingStrategy: loadBalancer: scope: External providerParameters: type: AWS aws: type: Classic type: LoadBalancerService Note If you do not specify a value for the spec.endpointPublishingStrategy.loadBalancer.providerParameters.aws.type field, the Ingress Controller uses the spec.loadBalancer.platform.aws.type value from the cluster Ingress configuration that was set during installation. Tip If your Ingress Controller has other customizations that you want to update, such as changing the domain, consider force replacing the Ingress Controller definition file instead. Apply the changes to the Ingress Controller YAML file by running the command: USD oc apply -f ingresscontroller.yaml Expect several minutes of outages while the Ingress Controller updates. 20.6.2.3. Replacing Ingress Controller Classic Load Balancer with Network Load Balancer You can replace an Ingress Controller that is using a Classic Load Balancer (CLB) with one that uses a Network Load Balancer (NLB) on AWS. Warning This procedure might cause the following issues: An outage that can last several minutes due to new DNS records propagation, new load balancers provisioning, and other factors. IP addresses and canonical names of the Ingress Controller load balancer might change after applying this procedure. Leaked load balancer resources due to a change in the annotation of the service. Procedure Create a file with a new default Ingress Controller. The following example assumes that your default Ingress Controller has an External scope and no other customizations: Example ingresscontroller.yml file apiVersion: operator.openshift.io/v1 kind: IngressController metadata: creationTimestamp: null name: default namespace: openshift-ingress-operator spec: endpointPublishingStrategy: loadBalancer: scope: External providerParameters: type: AWS aws: type: NLB type: LoadBalancerService If your default Ingress Controller has other customizations, ensure that you modify the file accordingly. Tip If your Ingress Controller has no other customizations and you are only updating the load balancer type, consider following the procedure detailed in "Switching the Ingress Controller from using a Classic Load Balancer to a Network Load Balancer". Force replace the Ingress Controller YAML file: USD oc replace --force --wait -f ingresscontroller.yml Wait until the Ingress Controller is replaced. Expect several of minutes of outages. 20.6.2.4. Configuring an Ingress Controller Network Load Balancer on an existing AWS cluster You can create an Ingress Controller backed by an AWS Network Load Balancer (NLB) on an existing cluster. Prerequisites You must have an installed AWS cluster. PlatformStatus of the infrastructure resource must be AWS. To verify that the PlatformStatus is AWS, run: USD oc get infrastructure/cluster -o jsonpath='{.status.platformStatus.type}' AWS Procedure Create an Ingress Controller backed by an AWS NLB on an existing cluster. Create the Ingress Controller manifest: USD cat ingresscontroller-aws-nlb.yaml Example output apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: USDmy_ingress_controller 1 namespace: openshift-ingress-operator spec: domain: USDmy_unique_ingress_domain 2 endpointPublishingStrategy: type: LoadBalancerService loadBalancer: scope: External 3 providerParameters: type: AWS aws: type: NLB 1 Replace USDmy_ingress_controller with a unique name for the Ingress Controller. 2 Replace USDmy_unique_ingress_domain with a domain name that is unique among all Ingress Controllers in the cluster. This variable must be a subdomain of the DNS name <clustername>.<domain> . 3 You can replace External with Internal to use an internal NLB. Create the resource in the cluster: USD oc create -f ingresscontroller-aws-nlb.yaml Important Before you can configure an Ingress Controller NLB on a new AWS cluster, you must complete the Creating the installation configuration file procedure. 20.6.2.5. Configuring an Ingress Controller Network Load Balancer on a new AWS cluster You can create an Ingress Controller backed by an AWS Network Load Balancer (NLB) on a new cluster. Prerequisites Create the install-config.yaml file and complete any modifications to it. Procedure Create an Ingress Controller backed by an AWS NLB on a new cluster. Change to the directory that contains the installation program and create the manifests: USD ./openshift-install create manifests --dir <installation_directory> 1 1 For <installation_directory> , specify the name of the directory that contains the install-config.yaml file for your cluster. Create a file that is named cluster-ingress-default-ingresscontroller.yaml in the <installation_directory>/manifests/ directory: USD touch <installation_directory>/manifests/cluster-ingress-default-ingresscontroller.yaml 1 1 For <installation_directory> , specify the directory name that contains the manifests/ directory for your cluster. After creating the file, several network configuration files are in the manifests/ directory, as shown: USD ls <installation_directory>/manifests/cluster-ingress-default-ingresscontroller.yaml Example output cluster-ingress-default-ingresscontroller.yaml Open the cluster-ingress-default-ingresscontroller.yaml file in an editor and enter a custom resource (CR) that describes the Operator configuration you want: apiVersion: operator.openshift.io/v1 kind: IngressController metadata: creationTimestamp: null name: default namespace: openshift-ingress-operator spec: endpointPublishingStrategy: loadBalancer: scope: External providerParameters: type: AWS aws: type: NLB type: LoadBalancerService Save the cluster-ingress-default-ingresscontroller.yaml file and quit the text editor. Optional: Back up the manifests/cluster-ingress-default-ingresscontroller.yaml file. The installation program deletes the manifests/ directory when creating the cluster. 20.6.2.6. Choosing subnets while creating a LoadBalancerService Ingress Controller You can manually specify load balancer subnets for Ingress Controllers in an existing cluster. By default, the load balancer subnets are automatically discovered by AWS, but specifying them in the Ingress Controller overrides this, allowing for manual control. Prerequisites You must have an installed AWS cluster. You must know the names or IDs of the subnets to which you intend to map your IngressController . Procedure Create a custom resource (CR) file. Create a YAML file (e.g., sample-ingress.yaml ) with the following content: apiVersion: operator.openshift.io/v1 kind: IngressController metadata: namespace: openshift-ingress-operator name: <name> spec: domain: <domain> endpointPublishingStrategy: type: LoadBalancerService loadBalancer: scope: External dnsManagementPolicy: Managed Create a custom resource (CR) file. Add subnets to your YAML file: apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: <name> 1 namespace: openshift-ingress-operator spec: domain: <domain> 2 endpointPublishingStrategy: type: LoadBalancerService loadBalancer: scope: External providerParameters: type: AWS aws: type: Classic classicLoadBalancer: 3 subnets: ids: 4 - <subnet> 5 - <subnet> - <subnet> dnsManagementPolicy: Managed 1 Replace <name> with a name for the IngressController . 2 Replace <domain> with the DNS name serviced by the IngressController . 3 You can also use the networkLoadBalancer field if using an NLB. 4 You can optionally specify a subnet by name using the names field instead of specifying the subnet by ID. 5 Specify subnet IDs (or names if you using names ). Important You can specify a maximum of one subnet per availability zone. Only provide public subnets for external Ingress Controllers and private subnets for internal Ingress Controllers. Apply the CR file. Save the file and apply it using the OpenShift CLI ( oc ). USD oc apply -f sample-ingress.yaml Confirm the load balancer was provisioned successfully by checking the IngressController conditions. USD oc get ingresscontroller -n openshift-ingress-operator <name> -o jsonpath="{.status.conditions}" | yq -PC 20.6.2.7. Updating the subnets on an existing Ingress Controller You can update an IngressController with manually specified load balancer subnets in OpenShift Container Platform to avoid any disruptions, to maintain the stability of your services, and to ensure that your network configuration aligns with your specific requirements. The following procedures show you how to select and apply new subnets, verify the configuration changes, and confirm successful load balancer provisioning. Warning This procedure may cause an outage that can last several minutes due to new DNS records propagation, new load balancers provisioning, and other factors. IP addresses and canonical names of the Ingress Controller load balancer might change after applying this procedure. Procedure To update an IngressController with manually specified load balancer subnets, you can follow these steps: Modify the existing IngressController to update to the new subnets. apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: <name> 1 namespace: openshift-ingress-operator spec: domain: <domain> 2 endpointPublishingStrategy: type: LoadBalancerService loadBalancer: scope: External providerParameters: type: AWS aws: type: Classic 3 classicLoadBalancer: 4 subnets: ids: 5 - <updated_subnet> 6 - <updated_subnet> - <updated_subnet> 1 Replace <name> with a name for the IngressController . 2 Replace <domain> with the DNS name serviced by the IngressController . 3 Specify updated subnet IDs (or names if you using names ). 4 You can also use the networkLoadBalancer field if using an NLB. 5 You can optionally specify a subnet by name using the names field instead of specifying the subnet by ID. 6 Update subnet IDs (or names if you are using names ). Important You can specify a maximum of one subnet per availability zone. Only provide public subnets for external Ingress Controllers and private subnets for internal Ingress Controllers. Examine the Progressing condition on the IngressController for instructions on how to apply the subnet updates by running the following command: USD oc get ingresscontroller -n openshift-ingress-operator subnets -o jsonpath="{.status.conditions[?(@.type==\"Progressing\")]}" | yq -PC Example output lastTransitionTime: "2024-11-25T20:19:31Z" message: 'One or more status conditions indicate progressing: LoadBalancerProgressing=True (OperandsProgressing: One or more managed resources are progressing: The IngressController subnets were changed from [...] to [...]. To effectuate this change, you must delete the service: `oc -n openshift-ingress delete svc/router-<name>`; the service load-balancer will then be deprovisioned and a new one created. This will most likely cause the new load-balancer to have a different host name and IP address and cause disruption. To return to the state, you can revert the change to the IngressController: [...]' reason: IngressControllerProgressing status: "True" type: Progressing To apply the update, delete the service associated with the Ingress controller by running the following command: USD oc -n openshift-ingress delete svc/router-<name> Verification To confirm that the load balancer was provisioned successfully, check the IngressController conditions by running the following command: USD oc get ingresscontroller -n openshift-ingress-operator <name> -o jsonpath="{.status.conditions}" | yq -PC 20.6.2.8. Configuring AWS Elastic IP (EIP) addresses for a Network Load Balancer (NLB) You can specify static IPs, otherwise known as elastic IPs, for your network load balancer (NLB) in the Ingress Controller. This is useful in situations where you want to configure appropriate firewall rules for your cluster network. Prerequisites You must have an installed AWS cluster. You must know the names or IDs of the subnets to which you intend to map your IngressController . Procedure Create a YAML file that contains the following content: sample-ingress.yaml apiVersion: operator.openshift.io/v1 kind: IngressController metadata: namespace: openshift-ingress-operator name: <name> 1 spec: domain: <domain> 2 endpointPublishingStrategy: loadBalancer: scope: External 3 type: LoadBalancerService providerParameters: type: AWS aws: type: NLB networkLoadBalancer: subnets: 4 ids: - <subnet_ID> names: - <subnet_A> - <subnet_B> eipAllocations: 5 - <eipalloc_A> - <eipalloc_B> - <eipalloc_C> 1 Replace the <name> placeholder with a name for the Ingress Controller. 2 Replace the <domain> placeholder with the DNS name serviced by the Ingress Controller. 3 The scope must be set to the value External and be Internet-facing in order to allocate EIPs. 4 Specify the IDs and names for your subnets. The total number of IDs and names must be equal to your allocated EIPs. 5 Specify the EIP addresses. Important You can specify a maximum of one subnet per availability zone. Only provide public subnets for external Ingress Controllers. You can associate one EIP address per subnet. Save and apply the CR file by entering the following command: USD oc apply -f sample-ingress.yaml Verification Confirm the load balancer was provisioned successfully by checking the IngressController conditions by running the following command: USD oc get ingresscontroller -n openshift-ingress-operator <name> -o jsonpath="{.status.conditions}" | yq -PC 20.6.3. Additional resources Installing a cluster on AWS with network customizations . For more information on support for NLBs, see Network Load Balancer support on AWS . For more information on proxy protocol support for CLBs, see Configure proxy protocol support for your Classic Load Balancer 20.7. Configuring ingress cluster traffic for a service external IP You can use either a MetalLB implementation or an IP failover deployment to attach an ExternalIP resource to a service so that the service is available to traffic outside your OpenShift Container Platform cluster. Hosting an external IP address in this way is only applicable for a cluster installed on bare-metal hardware. You must ensure that you correctly configure the external network infrastructure to route traffic to the service. 20.7.1. Prerequisites Your cluster is configured with ExternalIPs enabled. For more information, read Configuring ExternalIPs for services . Note Do not use the same ExternalIP for the egress IP. 20.7.2. Attaching an ExternalIP to a service You can attach an ExternalIP resource to a service. If you configured your cluster to automatically attach the resource to a service, you might not need to manually attach an ExternalIP to the service. The examples in the procedure use a scenario that manually attaches an ExternalIP resource to a service in a cluster with an IP failover configuration. Procedure Confirm compatible IP address ranges for the ExternalIP resource by entering the following command in your CLI: USD oc get networks.config cluster -o jsonpath='{.spec.externalIP}{"\n"}' Note If autoAssignCIDRs is set and you did not specify a value for spec.externalIPs in the ExternalIP resource, OpenShift Container Platform automatically assigns ExternalIP to a new Service object. Choose one of the following options to attach an ExternalIP resource to the service: If you are creating a new service, specify a value in the spec.externalIPs field and array of one or more valid IP addresses in the allowedCIDRs parameter. Example of service YAML configuration file that supports an ExternalIP resource apiVersion: v1 kind: Service metadata: name: svc-with-externalip spec: externalIPs: policy: allowedCIDRs: - 192.168.123.0/28 If you are attaching an ExternalIP to an existing service, enter the following command. Replace <name> with the service name. Replace <ip_address> with a valid ExternalIP address. You can provide multiple IP addresses separated by commas. USD oc patch svc <name> -p \ '{ "spec": { "externalIPs": [ "<ip_address>" ] } }' For example: USD oc patch svc mysql-55-rhel7 -p '{"spec":{"externalIPs":["192.174.120.10"]}}' Example output "mysql-55-rhel7" patched To confirm that an ExternalIP address is attached to the service, enter the following command. If you specified an ExternalIP for a new service, you must create the service first. USD oc get svc Example output NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE mysql-55-rhel7 172.30.131.89 192.174.120.10 3306/TCP 13m 20.7.3. Additional resources About MetalLB and the MetalLB Operator Configuring IP failover Configuring ExternalIPs for services 20.8. Configuring ingress cluster traffic by using a NodePort OpenShift Container Platform provides methods for communicating from outside the cluster with services running in the cluster. This method uses a NodePort . 20.8.1. Using a NodePort to get traffic into the cluster Use a NodePort -type Service resource to expose a service on a specific port on all nodes in the cluster. The port is specified in the Service resource's .spec.ports[*].nodePort field. Important Using a node port requires additional port resources. A NodePort exposes the service on a static port on the node's IP address. NodePort s are in the 30000 to 32767 range by default, which means a NodePort is unlikely to match a service's intended port. For example, port 8080 may be exposed as port 31020 on the node. The administrator must ensure the external IP addresses are routed to the nodes. NodePort s and external IPs are independent and both can be used concurrently. Note The procedures in this section require prerequisites performed by the cluster administrator. 20.8.2. Prerequisites Before starting the following procedures, the administrator must: Set up the external port to the cluster networking environment so that requests can reach the cluster. Make sure there is at least one user with cluster admin role. To add this role to a user, run the following command: Have an OpenShift Container Platform cluster with at least one master and at least one node and a system outside the cluster that has network access to the cluster. This procedure assumes that the external system is on the same subnet as the cluster. The additional networking required for external systems on a different subnet is out-of-scope for this topic. 20.8.3. Creating a project and service If the project and service that you want to expose does not exist, create the project and then create the service. If the project and service already exists, skip to the procedure on exposing the service to create a route. Prerequisites Install the OpenShift CLI ( oc ) and log in as a cluster administrator. Procedure Create a new project for your service by running the oc new-project command: USD oc new-project <project_name> Use the oc new-app command to create your service: USD oc new-app nodejs:12~https://github.com/sclorg/nodejs-ex.git To verify that the service was created, run the following command: USD oc get svc -n <project_name> Example output NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nodejs-ex ClusterIP 172.30.197.157 <none> 8080/TCP 70s Note By default, the new service does not have an external IP address. 20.8.4. Exposing the service by creating a route You can expose the service as a route by using the oc expose command. Prerequisites You logged into OpenShift Container Platform. Procedure Log in to the project where the service you want to expose is located: USD oc project <project_name> To expose a node port for the application, modify the custom resource definition (CRD) of a service by entering the following command: USD oc edit svc <service_name> Example output spec: ports: - name: 8443-tcp nodePort: 30327 1 port: 8443 protocol: TCP targetPort: 8443 sessionAffinity: None type: NodePort 2 1 Optional: Specify the node port range for the application. By default, OpenShift Container Platform selects an available port in the 30000-32767 range. 2 Define the service type. Optional: To confirm the service is available with a node port exposed, enter the following command: USD oc get svc -n myproject Example output NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nodejs-ex ClusterIP 172.30.217.127 <none> 3306/TCP 9m44s nodejs-ex-ingress NodePort 172.30.107.72 <none> 3306:31345/TCP 39s Optional: To remove the service created automatically by the oc new-app command, enter the following command: USD oc delete svc nodejs-ex Verification To check that the service node port is updated with a port in the 30000-32767 range, enter the following command: USD oc get svc In the following example output, the updated port is 30327 : Example output NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE httpd NodePort 172.xx.xx.xx <none> 8443:30327/TCP 109s 20.8.5. Additional resources Configuring the node port service range Adding a single NodePort service to an Ingress Controller 20.9. Configuring ingress cluster traffic using load balancer allowed source ranges You can specify a list of IP address ranges for the IngressController . This restricts access to the load balancer service when the endpointPublishingStrategy is LoadBalancerService . 20.9.1. Configuring load balancer allowed source ranges You can enable and configure the spec.endpointPublishingStrategy.loadBalancer.allowedSourceRanges field. By configuring load balancer allowed source ranges, you can limit the access to the load balancer for the Ingress Controller to a specified list of IP address ranges. The Ingress Operator reconciles the load balancer Service and sets the spec.loadBalancerSourceRanges field based on AllowedSourceRanges . Note If you have already set the spec.loadBalancerSourceRanges field or the load balancer service anotation service.beta.kubernetes.io/load-balancer-source-ranges in a version of OpenShift Container Platform, Ingress Controller starts reporting Progressing=True after an upgrade. To fix this, set AllowedSourceRanges that overwrites the spec.loadBalancerSourceRanges field and clears the service.beta.kubernetes.io/load-balancer-source-ranges annotation. Ingress Controller starts reporting Progressing=False again. Prerequisites You have a deployed Ingress Controller on a running cluster. Procedure Set the allowed source ranges API for the Ingress Controller by running the following command: USD oc -n openshift-ingress-operator patch ingresscontroller/default \ --type=merge --patch='{"spec":{"endpointPublishingStrategy": \ {"type":"LoadBalancerService", "loadbalancer": \ {"scope":"External", "allowedSourceRanges":["0.0.0.0/0"]}}}}' 1 1 The example value 0.0.0.0/0 specifies the allowed source range. 20.9.2. Migrating to load balancer allowed source ranges If you have already set the annotation service.beta.kubernetes.io/load-balancer-source-ranges , you can migrate to load balancer allowed source ranges. When you set the AllowedSourceRanges , the Ingress Controller sets the spec.loadBalancerSourceRanges field based on the AllowedSourceRanges value and unsets the service.beta.kubernetes.io/load-balancer-source-ranges annotation. Note If you have already set the spec.loadBalancerSourceRanges field or the load balancer service anotation service.beta.kubernetes.io/load-balancer-source-ranges in a version of OpenShift Container Platform, the Ingress Controller starts reporting Progressing=True after an upgrade. To fix this, set AllowedSourceRanges that overwrites the spec.loadBalancerSourceRanges field and clears the service.beta.kubernetes.io/load-balancer-source-ranges annotation. The Ingress Controller starts reporting Progressing=False again. Prerequisites You have set the service.beta.kubernetes.io/load-balancer-source-ranges annotation. Procedure Ensure that the service.beta.kubernetes.io/load-balancer-source-ranges is set: USD oc get svc router-default -n openshift-ingress -o yaml Example output apiVersion: v1 kind: Service metadata: annotations: service.beta.kubernetes.io/load-balancer-source-ranges: 192.168.0.1/32 Ensure that the spec.loadBalancerSourceRanges field is unset: USD oc get svc router-default -n openshift-ingress -o yaml Example output ... spec: loadBalancerSourceRanges: - 0.0.0.0/0 ... Update your cluster to OpenShift Container Platform 4.18. Set the allowed source ranges API for the ingresscontroller by running the following command: USD oc -n openshift-ingress-operator patch ingresscontroller/default \ --type=merge --patch='{"spec":{"endpointPublishingStrategy": \ {"loadBalancer":{"allowedSourceRanges":["0.0.0.0/0"]}}}}' 1 1 The example value 0.0.0.0/0 specifies the allowed source range. 20.9.3. Additional resources Introduction to OpenShift updates 20.10. Patching existing ingress objects You can update or modify the following fields of existing Ingress objects without recreating the objects or disrupting services to them: Specifications Host Path Backend services SSL/TLS settings Annotations 20.10.1. Patching Ingress objects to resolve an ingressWithoutClassName alert The ingressClassName field specifies the name of the IngressClass object. You must define the ingressClassName field for each Ingress object. If you have not defined the ingressClassName field for an Ingress object, you could experience routing issues. After 24 hours, you will receive an ingressWithoutClassName alert to remind you to set the ingressClassName field. Procedure Patch the Ingress objects with a completed ingressClassName field to ensure proper routing and functionality. List all IngressClass objects: USD oc get ingressclass List all Ingress objects in all namespaces: USD oc get ingress -A Patch the Ingress object: USD oc patch ingress/<ingress_name> --type=merge --patch '{"spec":{"ingressClassName":"openshift-default"}}' Replace <ingress_name> with the name of the Ingress object. This command patches the Ingress object to include the desired ingress class name.

Commands:
apiVersion: v1 kind: Service metadata: name: http-service spec: clusterIP: 172.30.163.110 externalIPs: - 192.168.132.253 externalTrafficPolicy: Cluster ports: - name: highport nodePort: 31903 port: 30102 protocol: TCP targetPort: 30102 selector: app: web sessionAffinity: None type: LoadBalancer status: loadBalancer: ingress: - ip: 192.168.132.253
{ "policy": { "allowedCIDRs": [], "rejectedCIDRs": [] } }
apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: externalIP: policy: {}
apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: externalIP: policy: allowedCIDRs: - 172.16.66.10/23 rejectedCIDRs: - 172.16.66.10/24
apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: clusterNetwork: - cidr: 10.128.0.0/14 hostPrefix: 23 externalIP: policy: {}
apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: externalIP: autoAssignCIDRs: [] 1 policy: 2
policy: allowedCIDRs: [] 1 rejectedCIDRs: [] 2
apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: externalIP: autoAssignCIDRs: - 192.168.132.254/29
apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: externalIP: policy: allowedCIDRs: - 192.168.132.0/29 - 192.168.132.8/29 rejectedCIDRs: - 192.168.132.7/32
oc describe networks.config cluster
oc edit networks.config cluster
apiVersion: config.openshift.io/v1 kind: Network metadata: name: cluster spec: externalIP: 1
oc get networks.config cluster -o go-template='{{.spec.externalIP}}{{"\n"}}'
oc adm policy add-cluster-role-to-user cluster-admin username
oc new-project <project_name>
oc new-app nodejs:12~https://github.com/sclorg/nodejs-ex.git
oc get svc -n <project_name>
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nodejs-ex ClusterIP 172.30.197.157 <none> 8080/TCP 70s
oc project <project_name>
oc expose service nodejs-ex
route.route.openshift.io/nodejs-ex exposed
oc get route
NAME HOST/PORT PATH SERVICES PORT TERMINATION WILDCARD nodejs-ex nodejs-ex-myproject.example.com nodejs-ex 8080-tcp None
curl --head nodejs-ex-myproject.example.com
HTTP/1.1 200 OK
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: finops-router namespace: openshift-ingress-operator spec: namespaceSelector: matchExpressions: - key: name operator: In values: - finance - ops
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: dev-router namespace: openshift-ingress-operator spec: namespaceSelector: matchLabels: name: dev
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: devops-router namespace: openshift-ingress-operator spec: namespaceSelector: matchExpressions: - key: name operator: In values: - dev - ops
oc edit ingresscontroller -n openshift-ingress-operator default
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: default namespace: openshift-ingress-operator spec: namespaceSelector: matchExpressions: - key: name operator: NotIn values: - finance - ops - dev
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: sharded namespace: openshift-ingress-operator spec: domain: <apps-sharded.basedomain.example.net> 1 nodePlacement: nodeSelector: matchLabels: node-role.kubernetes.io/worker: "" routeSelector: matchLabels: type: sharded
oc apply -f router-internal.yaml
oc expose svc <service-name> --hostname <route-name>.apps-sharded.basedomain.example.net
cat router-internal.yaml
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: sharded namespace: openshift-ingress-operator spec: domain: <apps-sharded.basedomain.example.net> 1 nodePlacement: nodeSelector: matchLabels: node-role.kubernetes.io/worker: "" namespaceSelector: matchLabels: type: sharded
oc apply -f router-internal.yaml
oc expose svc <service-name> --hostname <route-name>.apps-sharded.basedomain.example.net
oc new-project hello-openshift
oc create -f https://raw.githubusercontent.com/openshift/origin/master/examples/hello-openshift/hello-pod.json
oc expose pod/hello-openshift
apiVersion: route.openshift.io/v1 kind: Route metadata: labels: type: sharded 1 name: hello-openshift-edge namespace: hello-openshift spec: subdomain: hello-openshift 2 tls: termination: edge to: kind: Service name: hello-openshift
oc -n hello-openshift create -f hello-openshift-route.yaml
oc -n hello-openshift get routes/hello-openshift-edge -o yaml
apiVersion: route.openshift.io/v1 kind: Route metadata: labels: type: sharded name: hello-openshift-edge namespace: hello-openshift spec: subdomain: hello-openshift tls: termination: edge to: kind: Service name: hello-openshift status: ingress: - host: hello-openshift.<apps-sharded.basedomain.example.net> 1 routerCanonicalHostname: router-sharded.<apps-sharded.basedomain.example.net> 2 routerName: sharded 3
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: internal namespace: openshift-ingress-operator spec: domain: example.com endpointPublishingStrategy: type: HostNetwork hostNetwork: httpPort: 80 httpsPort: 443 statsPort: 1936
oc -n openshift-ingress-operator patch ingresscontrollers/default --type=merge --patch='{"spec":{"endpointPublishingStrategy":{"type":"LoadBalancerService","loadBalancer":{"scope":"Internal"}}}}'
oc -n openshift-ingress-operator get ingresscontrollers/default -o yaml
oc -n openshift-ingress delete services/router-default
oc -n openshift-ingress-operator patch ingresscontrollers/private --type=merge --patch='{"spec":{"endpointPublishingStrategy":{"type":"LoadBalancerService","loadBalancer":{"scope":"External"}}}}'
oc -n openshift-ingress-operator get ingresscontrollers/default -o yaml
oc -n openshift-ingress delete services/router-default
apiVersion: v1 items: - apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: <custom_ic_name> 1 namespace: openshift-ingress-operator spec: replicas: 1 domain: <custom_ic_domain_name> 2 nodePlacement: nodeSelector: matchLabels: <key>: <value> 3 namespaceSelector: matchLabels: <key>: <value> 4 endpointPublishingStrategy: type: NodePortService
oc label node <node_name> <key>=<value> 1
oc create -f <ingress_controller_cr>.yaml
oc get svc -n openshift-ingress
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE router-internal-default ClusterIP 172.30.195.74 <none> 80/TCP,443/TCP,1936/TCP 223d router-nodeport-custom-ic3 NodePort 172.30.109.219 <none> 80:32432/TCP,443:31366/TCP,1936:30499/TCP 155m
oc new-project <project_name>
oc label namespace <project_name> <key>=<value> 1
oc new-app --image=<image_name> 1
oc expose svc/<service_name> --hostname=<svc_name>-<project_name>.<custom_ic_domain_name> 1
oc get route/hello-openshift -o json | jq '.status.ingress'
{ "conditions": [ { "lastTransitionTime": "2024-05-17T18:25:41Z", "status": "True", "type": "Admitted" } ], [ { "host": "hello-openshift.nodeportsvc.ipi-cluster.example.com", "routerCanonicalHostname": "router-nodeportsvc.nodeportsvc.ipi-cluster.example.com", "routerName": "nodeportsvc", "wildcardPolicy": "None" } ], }
oc patch --type=merge -n openshift-ingress-operator ingresscontroller/default --patch '{"spec":{"namespaceSelector":{"matchExpressions":[{"key":"<key>","operator":"NotIn","values":["<value>]}]}}}'
dig +short <svc_name>-<project_name>.<custom_ic_domain_name>
curl <svc_name>-<project_name>.<custom_ic_domain_name>:<port> 1
Hello OpenShift!
oc adm policy add-cluster-role-to-user cluster-admin username
oc new-project <project_name>
oc new-app nodejs:12~https://github.com/sclorg/nodejs-ex.git
oc get svc -n <project_name>
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nodejs-ex ClusterIP 172.30.197.157 <none> 8080/TCP 70s
oc project <project_name>
oc expose service nodejs-ex
route.route.openshift.io/nodejs-ex exposed
oc get route
NAME HOST/PORT PATH SERVICES PORT TERMINATION WILDCARD nodejs-ex nodejs-ex-myproject.example.com nodejs-ex 8080-tcp None
curl --head nodejs-ex-myproject.example.com
HTTP/1.1 200 OK
oc project project1
apiVersion: v1 kind: Service metadata: name: egress-2 1 spec: ports: - name: db port: 3306 2 loadBalancerIP: loadBalancerSourceRanges: 3 - 10.0.0.0/8 - 192.168.0.0/16 type: LoadBalancer 4 selector: name: mysql 5
oc create -f <file-name>
oc create -f mysql-lb.yaml
oc get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE egress-2 LoadBalancer 172.30.22.226 ad42f5d8b303045-487804948.example.com 3306:30357/TCP 15m
curl <public-ip>:<port>
curl 172.29.121.74:3306
mysql -h 172.30.131.89 -u admin -p
Enter password: Welcome to the MariaDB monitor. Commands end with ; or \g. MySQL [(none)]>
oc annotate route <route_name> --overwrite haproxy.router.openshift.io/timeout=<timeout><time_unit> 1
oc annotate route myroute --overwrite haproxy.router.openshift.io/timeout=2s
oc -n openshift-ingress-operator patch ingresscontroller/default --type=merge --patch='{"spec":{"endpointPublishingStrategy": {"type":"LoadBalancerService", "loadBalancer": {"scope":"External", "providerParameters":{"type":"AWS", "aws": {"type":"Classic", "classicLoadBalancer": {"connectionIdleTimeout":"5m"}}}}}}}'
oc -n openshift-ingress-operator patch ingresscontroller/default --type=merge --patch='{"spec":{"endpointPublishingStrategy": {"loadBalancer":{"providerParameters":{"aws":{"classicLoadBalancer": {"connectionIdleTimeout":null}}}}}}}'
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: creationTimestamp: null name: default namespace: openshift-ingress-operator spec: endpointPublishingStrategy: loadBalancer: scope: External providerParameters: type: AWS aws: type: NLB type: LoadBalancerService
oc apply -f ingresscontroller.yaml
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: creationTimestamp: null name: default namespace: openshift-ingress-operator spec: endpointPublishingStrategy: loadBalancer: scope: External providerParameters: type: AWS aws: type: Classic type: LoadBalancerService
oc apply -f ingresscontroller.yaml
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: creationTimestamp: null name: default namespace: openshift-ingress-operator spec: endpointPublishingStrategy: loadBalancer: scope: External providerParameters: type: AWS aws: type: NLB type: LoadBalancerService
oc replace --force --wait -f ingresscontroller.yml
oc get infrastructure/cluster -o jsonpath='{.status.platformStatus.type}' AWS
cat ingresscontroller-aws-nlb.yaml
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: USDmy_ingress_controller 1 namespace: openshift-ingress-operator spec: domain: USDmy_unique_ingress_domain 2 endpointPublishingStrategy: type: LoadBalancerService loadBalancer: scope: External 3 providerParameters: type: AWS aws: type: NLB
oc create -f ingresscontroller-aws-nlb.yaml
./openshift-install create manifests --dir <installation_directory> 1
touch <installation_directory>/manifests/cluster-ingress-default-ingresscontroller.yaml 1
ls <installation_directory>/manifests/cluster-ingress-default-ingresscontroller.yaml
cluster-ingress-default-ingresscontroller.yaml
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: creationTimestamp: null name: default namespace: openshift-ingress-operator spec: endpointPublishingStrategy: loadBalancer: scope: External providerParameters: type: AWS aws: type: NLB type: LoadBalancerService
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: namespace: openshift-ingress-operator name: <name> spec: domain: <domain> endpointPublishingStrategy: type: LoadBalancerService loadBalancer: scope: External dnsManagementPolicy: Managed
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: <name> 1 namespace: openshift-ingress-operator spec: domain: <domain> 2 endpointPublishingStrategy: type: LoadBalancerService loadBalancer: scope: External providerParameters: type: AWS aws: type: Classic classicLoadBalancer: 3 subnets: ids: 4 - <subnet> 5 - <subnet> - <subnet> dnsManagementPolicy: Managed
oc apply -f sample-ingress.yaml
oc get ingresscontroller -n openshift-ingress-operator <name> -o jsonpath="{.status.conditions}" | yq -PC
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: name: <name> 1 namespace: openshift-ingress-operator spec: domain: <domain> 2 endpointPublishingStrategy: type: LoadBalancerService loadBalancer: scope: External providerParameters: type: AWS aws: type: Classic 3 classicLoadBalancer: 4 subnets: ids: 5 - <updated_subnet> 6 - <updated_subnet> - <updated_subnet>
oc get ingresscontroller -n openshift-ingress-operator subnets -o jsonpath="{.status.conditions[?(@.type==\"Progressing\")]}" | yq -PC
lastTransitionTime: "2024-11-25T20:19:31Z" message: 'One or more status conditions indicate progressing: LoadBalancerProgressing=True (OperandsProgressing: One or more managed resources are progressing: The IngressController subnets were changed from [...] to [...]. To effectuate this change, you must delete the service: `oc -n openshift-ingress delete svc/router-<name>`; the service load-balancer will then be deprovisioned and a new one created. This will most likely cause the new load-balancer to have a different host name and IP address and cause disruption. To return to the previous state, you can revert the change to the IngressController: [...]' reason: IngressControllerProgressing status: "True" type: Progressing
oc -n openshift-ingress delete svc/router-<name>
oc get ingresscontroller -n openshift-ingress-operator <name> -o jsonpath="{.status.conditions}" | yq -PC
apiVersion: operator.openshift.io/v1 kind: IngressController metadata: namespace: openshift-ingress-operator name: <name> 1 spec: domain: <domain> 2 endpointPublishingStrategy: loadBalancer: scope: External 3 type: LoadBalancerService providerParameters: type: AWS aws: type: NLB networkLoadBalancer: subnets: 4 ids: - <subnet_ID> names: - <subnet_A> - <subnet_B> eipAllocations: 5 - <eipalloc_A> - <eipalloc_B> - <eipalloc_C>
oc apply -f sample-ingress.yaml
oc get ingresscontroller -n openshift-ingress-operator <name> -o jsonpath="{.status.conditions}" | yq -PC
oc get networks.config cluster -o jsonpath='{.spec.externalIP}{"\n"}'
apiVersion: v1 kind: Service metadata: name: svc-with-externalip spec: externalIPs: policy: allowedCIDRs: - 192.168.123.0/28
oc patch svc <name> -p '{ "spec": { "externalIPs": [ "<ip_address>" ] } }'
oc patch svc mysql-55-rhel7 -p '{"spec":{"externalIPs":["192.174.120.10"]}}'
"mysql-55-rhel7" patched
oc get svc
NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE mysql-55-rhel7 172.30.131.89 192.174.120.10 3306/TCP 13m
oc adm policy add-cluster-role-to-user cluster-admin <user_name>
oc new-project <project_name>
oc new-app nodejs:12~https://github.com/sclorg/nodejs-ex.git
oc get svc -n <project_name>
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nodejs-ex ClusterIP 172.30.197.157 <none> 8080/TCP 70s
oc project <project_name>
oc edit svc <service_name>
spec: ports: - name: 8443-tcp nodePort: 30327 1 port: 8443 protocol: TCP targetPort: 8443 sessionAffinity: None type: NodePort 2
oc get svc -n myproject
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE nodejs-ex ClusterIP 172.30.217.127 <none> 3306/TCP 9m44s nodejs-ex-ingress NodePort 172.30.107.72 <none> 3306:31345/TCP 39s
oc delete svc nodejs-ex
oc get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE httpd NodePort 172.xx.xx.xx <none> 8443:30327/TCP 109s
oc -n openshift-ingress-operator patch ingresscontroller/default --type=merge --patch='{"spec":{"endpointPublishingStrategy": {"type":"LoadBalancerService", "loadbalancer": {"scope":"External", "allowedSourceRanges":["0.0.0.0/0"]}}}}' 1
oc get svc router-default -n openshift-ingress -o yaml
apiVersion: v1 kind: Service metadata: annotations: service.beta.kubernetes.io/load-balancer-source-ranges: 192.168.0.1/32
oc get svc router-default -n openshift-ingress -o yaml
spec: loadBalancerSourceRanges: - 0.0.0.0/0
oc -n openshift-ingress-operator patch ingresscontroller/default --type=merge --patch='{"spec":{"endpointPublishingStrategy": {"loadBalancer":{"allowedSourceRanges":["0.0.0.0/0"]}}}}' 1
oc get ingressclass
oc get ingress -A
oc patch ingress/<ingress_name> --type=merge --patch '{"spec":{"ingressClassName":"openshift-default"}}'