Chapter 5. Using AMQ Streams Operators Use the AMQ Streams operators to manage your Kafka cluster, and Kafka topics and users. 5.1. Using the Cluster Operator The Cluster Operator is used to deploy a Kafka cluster and other Kafka components. The Cluster Operator is deployed using YAML installation files. For information on deploying the Cluster Operator, see Deploying the Cluster Operator in the Deploying and Upgrading AMQ Streams on OpenShift guide. For information on the deployment options available for Kafka, see Kafka Cluster configuration . Note On OpenShift, a Kafka Connect deployment can incorporate a Source2Image feature to provide a convenient way to add additional connectors. 5.1.1. Cluster Operator configuration The Cluster Operator can be configured through the following supported environment variables and through the logging configuration. STRIMZI_NAMESPACE A comma-separated list of namespaces that the operator should operate in. When not set, set to empty string, or to * the Cluster Operator will operate in all namespaces. The Cluster Operator deployment might use the OpenShift Downward API to set this automatically to the namespace the Cluster Operator is deployed in. See the example below: env: - name: STRIMZI_NAMESPACE valueFrom: fieldRef: fieldPath: metadata.namespace STRIMZI_FULL_RECONCILIATION_INTERVAL_MS Optional, default is 120000 ms. The interval between periodic reconciliations, in milliseconds. STRIMZI_OPERATION_TIMEOUT_MS Optional, default 300000 ms. The timeout for internal operations, in milliseconds. This value should be increased when using AMQ Streams on clusters where regular OpenShift operations take longer than usual (because of slow downloading of Docker images, for example). STRIMZI_KAFKA_IMAGES Required. This provides a mapping from Kafka version to the corresponding Docker image containing a Kafka broker of that version. The required syntax is whitespace or comma separated <version> = <image> pairs. For example 2.5.0=registry.redhat.io/amq7/amq-streams-kafka-25-rhel7:1.6.7, 2.6.0=registry.redhat.io/amq7/amq-streams-kafka-26-rhel7:1.6.7 . This is used when a Kafka.spec.kafka.version property is specified but not the Kafka.spec.kafka.image , as described in Section 2.1.18, "Container images" . STRIMZI_DEFAULT_KAFKA_INIT_IMAGE Optional, default registry.redhat.io/amq7/amq-streams-rhel7-operator:1.6.7 . The image name to use as default for the init container started before the broker for initial configuration work (that is, rack support), if no image is specified as the kafka-init-image in the Section 2.1.18, "Container images" . STRIMZI_KAFKA_CONNECT_IMAGES Required. This provides a mapping from the Kafka version to the corresponding Docker image containing a Kafka connect of that version. The required syntax is whitespace or comma separated <version> = <image> pairs. For example 2.5.0=registry.redhat.io/amq7/amq-streams-kafka-25-rhel7:1.6.7, 2.6.0=registry.redhat.io/amq7/amq-streams-kafka-26-rhel7:1.6.7 . This is used when a KafkaConnect.spec.version property is specified but not the KafkaConnect.spec.image , as described in Section B.1.6, " image " . STRIMZI_KAFKA_CONNECT_S2I_IMAGES Required. This provides a mapping from the Kafka version to the corresponding Docker image containing a Kafka connect of that version. The required syntax is whitespace or comma separated <version> = <image> pairs. For example 2.5.0=registry.redhat.io/amq7/amq-streams-kafka-25-rhel7:1.6.7, 2.6.0=registry.redhat.io/amq7/amq-streams-kafka-26-rhel7:1.6.7 . This is used when a KafkaConnectS2I.spec.version property is specified but not the KafkaConnectS2I.spec.image , as described in Section B.1.6, " image " . STRIMZI_KAFKA_MIRROR_MAKER_IMAGES Required. This provides a mapping from the Kafka version to the corresponding Docker image containing a Kafka mirror maker of that version. The required syntax is whitespace or comma separated <version> = <image> pairs. For example 2.5.0=registry.redhat.io/amq7/amq-streams-kafka-25-rhel7:1.6.7, 2.6.0=registry.redhat.io/amq7/amq-streams-kafka-26-rhel7:1.6.7 . This is used when a KafkaMirrorMaker.spec.version property is specified but not the KafkaMirrorMaker.spec.image , as described in Section B.1.6, " image " . STRIMZI_DEFAULT_TOPIC_OPERATOR_IMAGE Optional, default registry.redhat.io/amq7/amq-streams-rhel7-operator:1.6.7 . The image name to use as the default when deploying the topic operator, if no image is specified as the Kafka.spec.entityOperator.topicOperator.image in the Section 2.1.18, "Container images" of the Kafka resource. STRIMZI_DEFAULT_USER_OPERATOR_IMAGE Optional, default registry.redhat.io/amq7/amq-streams-rhel7-operator:1.6.7 . The image name to use as the default when deploying the user operator, if no image is specified as the Kafka.spec.entityOperator.userOperator.image in the Section 2.1.18, "Container images" of the Kafka resource. STRIMZI_DEFAULT_TLS_SIDECAR_ENTITY_OPERATOR_IMAGE Optional, default registry.redhat.io/amq7/amq-streams-kafka-26-rhel7:1.6.7 . The image name to use as the default when deploying the sidecar container which provides TLS support for the Entity Operator, if no image is specified as the Kafka.spec.entityOperator.tlsSidecar.image in the Section 2.1.18, "Container images" . STRIMZI_IMAGE_PULL_POLICY Optional. The ImagePullPolicy which will be applied to containers in all pods managed by AMQ Streams Cluster Operator. The valid values are Always , IfNotPresent , and Never . If not specified, the OpenShift defaults will be used. Changing the policy will result in a rolling update of all your Kafka, Kafka Connect, and Kafka MirrorMaker clusters. STRIMZI_IMAGE_PULL_SECRETS Optional. A comma-separated list of Secret names. The secrets referenced here contain the credentials to the container registries where the container images are pulled from. The secrets are used in the imagePullSecrets field for all Pods created by the Cluster Operator. Changing this list results in a rolling update of all your Kafka, Kafka Connect, and Kafka MirrorMaker clusters. STRIMZI_KUBERNETES_VERSION Optional. Overrides the OpenShift version information detected from the API server. See the example below: env: - name: STRIMZI_KUBERNETES_VERSION value: | major=1 minor=16 gitVersion=v1.16.2 gitCommit=c97fe5036ef3df2967d086711e6c0c405941e14b gitTreeState=clean buildDate=2019-10-15T19:09:08Z goVersion=go1.12.10 compiler=gc platform=linux/amd64 KUBERNETES_SERVICE_DNS_DOMAIN Optional. Overrides the default OpenShift DNS domain name suffix. By default, services assigned in the OpenShift cluster have a DNS domain name that uses the default suffix cluster.local . For example, for broker kafka-0 : <cluster-name> -kafka-0. <cluster-name> -kafka-brokers. <namespace> .svc. cluster.local The DNS domain name is added to the Kafka broker certificates used for hostname verification. If you are using a different DNS domain name suffix in your cluster, change the KUBERNETES_SERVICE_DNS_DOMAIN environment variable from the default to the one you are using in order to establish a connection with the Kafka brokers. Configuration by ConfigMap The Cluster Operator's logging is configured by the strimzi-cluster-operator ConfigMap . A ConfigMap containing logging configuration is created when installing the Cluster Operator. This ConfigMap is described in the file install/cluster-operator/050-ConfigMap-strimzi-cluster-operator.yaml . You configure Cluster Operator logging by changing the data field log4j2.properties in this ConfigMap . To update the logging configuration, you can edit the 050-ConfigMap-strimzi-cluster-operator.yaml file and then run the following command: oc apply -f install/cluster-operator/050-ConfigMap-strimzi-cluster-operator.yaml Alternatively, edit the ConfigMap directly: oc edit cm strimzi-cluster-operator To change the frequency of the reload interval, set a time in seconds in the monitorInterval option in the created ConfigMap . If the ConfigMap is missing when the Cluster Operator is deployed, the default logging values are used. If the ConfigMap is accidentally deleted after the Cluster Operator is deployed, the most recently loaded logging configuration is used. Create a new ConfigMap to load a new logging configuration. Note Do not remove the monitorInterval option from the ConfigMap. 5.1.1.1. Periodic reconciliation Although the Cluster Operator reacts to all notifications about the desired cluster resources received from the OpenShift cluster, if the operator is not running, or if a notification is not received for any reason, the desired resources will get out of sync with the state of the running OpenShift cluster. In order to handle failovers properly, a periodic reconciliation process is executed by the Cluster Operator so that it can compare the state of the desired resources with the current cluster deployments in order to have a consistent state across all of them. You can set the time interval for the periodic reconciliations using the [STRIMZI_FULL_RECONCILIATION_INTERVAL_MS] variable. 5.1.2. Provisioning Role-Based Access Control (RBAC) For the Cluster Operator to function it needs permission within the OpenShift cluster to interact with resources such as Kafka , KafkaConnect , and so on, as well as the managed resources, such as ConfigMaps , Pods , Deployments , StatefulSets and Services . Such permission is described in terms of OpenShift role-based access control (RBAC) resources: ServiceAccount , Role and ClusterRole , RoleBinding and ClusterRoleBinding . In addition to running under its own ServiceAccount with a ClusterRoleBinding , the Cluster Operator manages some RBAC resources for the components that need access to OpenShift resources. OpenShift also includes privilege escalation protections that prevent components operating under one ServiceAccount from granting other ServiceAccounts privileges that the granting ServiceAccount does not have. Because the Cluster Operator must be able to create the ClusterRoleBindings , and RoleBindings needed by resources it manages, the Cluster Operator must also have those same privileges. 5.1.2.1. Delegated privileges When the Cluster Operator deploys resources for a desired Kafka resource it also creates ServiceAccounts , RoleBindings , and ClusterRoleBindings , as follows: The Kafka broker pods use a ServiceAccount called cluster-name -kafka When the rack feature is used, the strimzi- cluster-name -kafka-init ClusterRoleBinding is used to grant this ServiceAccount access to the nodes within the cluster via a ClusterRole called strimzi-kafka-broker When the rack feature is not used no binding is created The ZooKeeper pods use a ServiceAccount called cluster-name -zookeeper The Entity Operator pod uses a ServiceAccount called cluster-name -entity-operator The Topic Operator produces OpenShift events with status information, so the ServiceAccount is bound to a ClusterRole called strimzi-entity-operator which grants this access via the strimzi-entity-operator RoleBinding The pods for KafkaConnect and KafkaConnectS2I resources use a ServiceAccount called cluster-name -cluster-connect The pods for KafkaMirrorMaker use a ServiceAccount called cluster-name -mirror-maker The pods for KafkaMirrorMaker2 use a ServiceAccount called cluster-name -mirrormaker2 The pods for KafkaBridge use a ServiceAccount called cluster-name -bridge 5.1.2.2. ServiceAccount The Cluster Operator is best run using a ServiceAccount : Example ServiceAccount for the Cluster Operator apiVersion: v1 kind: ServiceAccount metadata: name: strimzi-cluster-operator labels: app: strimzi The Deployment of the operator then needs to specify this in its spec.template.spec.serviceAccountName : Partial example of Deployment for the Cluster Operator apiVersion: apps/v1 kind: Deployment metadata: name: strimzi-cluster-operator labels: app: strimzi spec: replicas: 1 selector: matchLabels: name: strimzi-cluster-operator strimzi.io/kind: cluster-operator template: # ... Note line 12, where the strimzi-cluster-operator ServiceAccount is specified as the serviceAccountName . 5.1.2.3. ClusterRoles The Cluster Operator needs to operate using ClusterRoles that gives access to the necessary resources. Depending on the OpenShift cluster setup, a cluster administrator might be needed to create the ClusterRoles . Note Cluster administrator rights are only needed for the creation of the ClusterRoles . The Cluster Operator will not run under the cluster admin account. The ClusterRoles follow the principle of least privilege and contain only those privileges needed by the Cluster Operator to operate Kafka, Kafka Connect, and ZooKeeper clusters. The first set of assigned privileges allow the Cluster Operator to manage OpenShift resources such as StatefulSets , Deployments , Pods , and ConfigMaps . Cluster Operator uses ClusterRoles to grant permission at the namespace-scoped resources level and cluster-scoped resources level: ClusterRole with namespaced resources for the Cluster Operator apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: strimzi-cluster-operator-namespaced labels: app: strimzi rules: - apiGroups: - "" resources: # The cluster operator needs to access and manage service accounts to grant Strimzi components cluster permissions - serviceaccounts verbs: - get - create - delete - patch - update - apiGroups: - "rbac.authorization.k8s.io" resources: # The cluster operator needs to access and manage rolebindings to grant Strimzi components cluster permissions - rolebindings verbs: - get - create - delete - patch - update - apiGroups: - "" resources: # The cluster operator needs to access and manage config maps for Strimzi components configuration - configmaps # The cluster operator needs to access and manage services to expose Strimzi components to network traffic - services # The cluster operator needs to access and manage secrets to handle credentials - secrets # The cluster operator needs to access and manage persistent volume claims to bind them to Strimzi components for persistent data - persistentvolumeclaims verbs: - get - list - watch - create - delete - patch - update - apiGroups: - "kafka.strimzi.io" resources: # The cluster operator runs the KafkaAssemblyOperator, which needs to access and manage Kafka resources - kafkas - kafkas/status # The cluster operator runs the KafkaConnectAssemblyOperator, which needs to access and manage KafkaConnect resources - kafkaconnects - kafkaconnects/status # The cluster operator runs the KafkaConnectS2IAssemblyOperator, which needs to access and manage KafkaConnectS2I resources - kafkaconnects2is - kafkaconnects2is/status # The cluster operator runs the KafkaConnectorAssemblyOperator, which needs to access and manage KafkaConnector resources - kafkaconnectors - kafkaconnectors/status # The cluster operator runs the KafkaMirrorMakerAssemblyOperator, which needs to access and manage KafkaMirrorMaker resources - kafkamirrormakers - kafkamirrormakers/status # The cluster operator runs the KafkaBridgeAssemblyOperator, which needs to access and manage BridgeMaker resources - kafkabridges - kafkabridges/status # The cluster operator runs the KafkaMirrorMaker2AssemblyOperator, which needs to access and manage KafkaMirrorMaker2 resources - kafkamirrormaker2s - kafkamirrormaker2s/status # The cluster operator runs the KafkaRebalanceAssemblyOperator, which needs to access and manage KafkaRebalance resources - kafkarebalances - kafkarebalances/status verbs: - get - list - watch - create - delete - patch - update - apiGroups: - "" resources: # The cluster operator needs to access and delete pods, this is to allow it to monitor pod health and coordinate rolling updates - pods verbs: - get - list - watch - delete - apiGroups: - "" resources: - endpoints verbs: - get - list - watch - apiGroups: # The cluster operator needs the extensions api as the operator supports Kubernetes version 1.11+ # apps/v1 was introduced in Kubernetes 1.14 - "extensions" resources: # The cluster operator needs to access and manage deployments to run deployment based Strimzi components - deployments - deployments/scale # The cluster operator needs to access replica sets to manage Strimzi components and to determine error states - replicasets # The cluster operator needs to access and manage replication controllers to manage replicasets - replicationcontrollers # The cluster operator needs to access and manage network policies to lock down communication between Strimzi components - networkpolicies # The cluster operator needs to access and manage ingresses which allow external access to the services in a cluster - ingresses verbs: - get - list - watch - create - delete - patch - update - apiGroups: - "apps" resources: # The cluster operator needs to access and manage deployments to run deployment based Strimzi components - deployments - deployments/scale - deployments/status # The cluster operator needs to access and manage stateful sets to run stateful sets based Strimzi components - statefulsets # The cluster operator needs to access replica-sets to manage Strimzi components and to determine error states - replicasets verbs: - get - list - watch - create - delete - patch - update - apiGroups: - "" resources: # The cluster operator needs to be able to create events and delegate permissions to do so - events verbs: - create - apiGroups: # OpenShift S2I requirements - apps.openshift.io resources: - deploymentconfigs - deploymentconfigs/scale - deploymentconfigs/status - deploymentconfigs/finalizers verbs: - get - list - watch - create - delete - patch - update - apiGroups: # OpenShift S2I requirements - build.openshift.io resources: - buildconfigs - builds verbs: - create - delete - get - list - patch - watch - update - apiGroups: # OpenShift S2I requirements - image.openshift.io resources: - imagestreams - imagestreams/status verbs: - create - delete - get - list - watch - patch - update - apiGroups: - networking.k8s.io resources: # The cluster operator needs to access and manage network policies to lock down communication between Strimzi components - networkpolicies verbs: - get - list - watch - create - delete - patch - update - apiGroups: - route.openshift.io resources: # The cluster operator needs to access and manage routes to expose Strimzi components for external access - routes - routes/custom-host verbs: - get - list - create - delete - patch - update - apiGroups: - policy resources: # The cluster operator needs to access and manage pod disruption budgets this limits the number of concurrent disruptions # that a Strimzi component experiences, allowing for higher availability - poddisruptionbudgets verbs: - get - list - watch - create - delete - patch - update The second includes the permissions needed for cluster-scoped resources. ClusterRole with cluster-scoped resources for the Cluster Operator apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: strimzi-cluster-operator-global labels: app: strimzi rules: - apiGroups: - "rbac.authorization.k8s.io" resources: # The cluster operator needs to create and manage cluster role bindings in the case of an install where a user # has specified they want their cluster role bindings generated - clusterrolebindings verbs: - get - create - delete - patch - update - watch - apiGroups: - storage.k8s.io resources: # The cluster operator requires "get" permissions to view storage class details # This is because only a persistent volume of a supported storage class type can be resized - storageclasses verbs: - get - apiGroups: - "" resources: # The cluster operator requires "list" permissions to view all nodes in a cluster # The listing is used to determine the node addresses when NodePort access is configured # These addresses are then exposed in the custom resource states - nodes verbs: - list The strimzi-kafka-broker ClusterRole represents the access needed by the init container in Kafka pods that is used for the rack feature. As described in the Delegated privileges section, this role is also needed by the Cluster Operator in order to be able to delegate this access. ClusterRole for the Cluster Operator allowing it to delegate access to OpenShift nodes to the Kafka broker pods apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: strimzi-kafka-broker labels: app: strimzi rules: - apiGroups: - "" resources: # The Kafka Brokers require "get" permissions to view the node they are on # This information is used to generate a Rack ID that is used for High Availability configurations - nodes verbs: - get The strimzi-topic-operator ClusterRole represents the access needed by the Topic Operator. As described in the Delegated privileges section, this role is also needed by the Cluster Operator in order to be able to delegate this access. ClusterRole for the Cluster Operator allowing it to delegate access to events to the Topic Operator apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: strimzi-entity-operator labels: app: strimzi rules: - apiGroups: - "kafka.strimzi.io" resources: # The entity operator runs the KafkaTopic assembly operator, which needs to access and manage KafkaTopic resources - kafkatopics - kafkatopics/status # The entity operator runs the KafkaUser assembly operator, which needs to access and manage KafkaUser resources - kafkausers - kafkausers/status verbs: - get - list - watch - create - patch - update - delete - apiGroups: - "" resources: - events verbs: # The entity operator needs to be able to create events - create - apiGroups: - "" resources: # The entity operator user-operator needs to access and manage secrets to store generated credentials - secrets verbs: - get - list - create - patch - update - delete The strimzi-kafka-client ClusterRole represents the access needed by the components based on Kafka clients which use the client rack-awareness. As described in the Delegated privileges section, this role is also needed by the Cluster Operator in order to be able to delegate this access. ClusterRole for the Cluster Operator allowing it to delegate access to OpenShift nodes to the Kafka client based pods apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: strimzi-kafka-client labels: app: strimzi rules: - apiGroups: - "" resources: # The Kafka clients (Connect, Mirror Maker, etc.) require "get" permissions to view the node they are on # This information is used to generate a Rack ID (client.rack option) that is used for consuming from the closest # replicas when enabled - nodes verbs: - get 5.1.2.4. ClusterRoleBindings The operator needs ClusterRoleBindings and RoleBindings which associates its ClusterRole with its ServiceAccount : ClusterRoleBindings are needed for ClusterRoles containing cluster-scoped resources. Example ClusterRoleBinding for the Cluster Operator apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: strimzi-cluster-operator labels: app: strimzi subjects: - kind: ServiceAccount name: strimzi-cluster-operator namespace: myproject roleRef: kind: ClusterRole name: strimzi-cluster-operator-global apiGroup: rbac.authorization.k8s.io ClusterRoleBindings are also needed for the ClusterRoles needed for delegation: Example ClusterRoleBinding for the Cluster Operator for the Kafka broker rack-awarness apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: strimzi-cluster-operator-kafka-broker-delegation labels: app: strimzi # The Kafka broker cluster role must be bound to the cluster operator service account so that it can delegate the cluster role to the Kafka brokers. # This must be done to avoid escalating privileges which would be blocked by Kubernetes. subjects: - kind: ServiceAccount name: strimzi-cluster-operator namespace: myproject roleRef: kind: ClusterRole name: strimzi-kafka-broker apiGroup: rbac.authorization.k8s.io and Example ClusterRoleBinding for the Cluster Operator for the Kafka client rack-awarness apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: strimzi-cluster-operator-kafka-client-delegation labels: app: strimzi # The Kafka clients cluster role must be bound to the cluster operator service account so that it can delegate the # cluster role to the Kafka clients using it for consuming from closest replica. # This must be done to avoid escalating privileges which would be blocked by Kubernetes. subjects: - kind: ServiceAccount name: strimzi-cluster-operator namespace: myproject roleRef: kind: ClusterRole name: strimzi-kafka-client apiGroup: rbac.authorization.k8s.io ClusterRoles containing only namespaced resources are bound using RoleBindings only. apiVersion: rbac.authorization.k8s.io/v1 kind: RoleBinding metadata: name: strimzi-cluster-operator labels: app: strimzi subjects: - kind: ServiceAccount name: strimzi-cluster-operator namespace: myproject roleRef: kind: ClusterRole name: strimzi-cluster-operator-namespaced apiGroup: rbac.authorization.k8s.io apiVersion: rbac.authorization.k8s.io/v1 kind: RoleBinding metadata: name: strimzi-cluster-operator-entity-operator-delegation labels: app: strimzi # The Entity Operator cluster role must be bound to the cluster operator service account so that it can delegate the cluster role to the Entity Operator. # This must be done to avoid escalating privileges which would be blocked by Kubernetes. subjects: - kind: ServiceAccount name: strimzi-cluster-operator namespace: myproject roleRef: kind: ClusterRole name: strimzi-entity-operator apiGroup: rbac.authorization.k8s.io 5.2. Using the Topic Operator When you create, modify or delete a topic using the KafkaTopic resource, the Topic Operator ensures those changes are reflected in the Kafka cluster. The Deploying and Upgrading AMQ Streams on OpenShift guide provides instructions to deploy the Topic Operator: Using the Cluster Operator (recommended) Standalone to operate with Kafka clusters not managed by AMQ Streams 5.2.1. Kafka topic resource The KafkaTopic resource is used to configure topics, including the number of partitions and replicas. The full schema for KafkaTopic is described in KafkaTopic schema reference . 5.2.1.1. Identifying a Kafka cluster for topic handling A KafkaTopic resource includes a label that defines the appropriate name of the Kafka cluster (derived from the name of the Kafka resource) to which it belongs. For example: apiVersion: kafka.strimzi.io/v1beta1 kind: KafkaTopic metadata: name: topic-name-1 labels: strimzi.io/cluster: my-cluster The label is used by the Topic Operator to identify the KafkaTopic resource and create a new topic, and also in subsequent handling of the topic. If the label does not match the Kafka cluster, the Topic Operator cannot identify the KafkaTopic and the topic is not created. 5.2.1.2. Handling changes to topics A fundamental problem that the Topic Operator has to solve is that there is no single source of truth: Both the KafkaTopic resource and the Kafka topic can be modified independently of the operator. Complicating this, the Topic Operator might not always be able to observe changes at each end in real time (for example, the operator might be down). To resolve this, the operator maintains its own private copy of the information about each topic. When a change happens either in the Kafka cluster, or in OpenShift, it looks at both the state of the other system and at its private copy in order to determine what needs to change to keep everything in sync. The same thing happens whenever the operator starts, and periodically while it is running. For example, suppose the Topic Operator is not running, and a KafkaTopic my-topic gets created. When the operator starts it will lack a private copy of "my-topic", so it can infer that the KafkaTopic has been created since it was last running. The operator will create the topic corresponding to my-topic , and also store a private copy of the metadata for my-topic . The private copy allows the operator to cope with scenarios where the topic configuration gets changed both in Kafka and in OpenShift, so long as the changes are not incompatible (for example, both changing the same topic config key, but to different values). In the case of incompatible changes, the Kafka configuration wins, and the KafkaTopic will be updated to reflect that. The private copy is held in the same ZooKeeper ensemble used by Kafka itself. This mitigates availability concerns, because if ZooKeeper is not running then Kafka itself cannot run, so the operator will be no less available than it would even if it was stateless. 5.2.1.3. Kafka topic usage recommendations When working with topics, be consistent. Always operate on either KafkaTopic resources or topics directly in OpenShift. Avoid routinely switching between both methods for a given topic. Use topic names that reflect the nature of the topic, and remember that names cannot be changed later. If creating a topic in Kafka, use a name that is a valid OpenShift resource name, otherwise the Topic Operator will need to create the corresponding KafkaTopic with a name that conforms to the OpenShift rules. Note Recommendations for identifiers and names in OpenShift are outlined in Identifiers and Names in OpenShift community article. 5.2.1.4. Kafka topic naming conventions Kafka and OpenShift impose their own validation rules for the naming of topics in Kafka and KafkaTopic.metadata.name respectively. There are valid names for each which are invalid in the other. Using the spec.topicName property, it is possible to create a valid topic in Kafka with a name that would be invalid for the Kafka topic in OpenShift. The spec.topicName property inherits Kafka naming validation rules: The name must not be longer than 249 characters. Valid characters for Kafka topics are ASCII alphanumerics, . , _ , and - . The name cannot be . or .. , though . can be used in a name, such as exampleTopic. or .exampleTopic . spec.topicName must not be changed. For example: apiVersion: {KafkaApiVersion} kind: KafkaTopic metadata: name: topic-name-1 spec: topicName: topicName-1 1 # ... 1 Upper case is invalid in OpenShift. cannot be changed to: apiVersion: {KafkaApiVersion} kind: KafkaTopic metadata: name: topic-name-1 spec: topicName: name-2 # ... Note Some Kafka client applications, such as Kafka Streams, can create topics in Kafka programmatically. If those topics have names that are invalid OpenShift resource names, the Topic Operator gives them valid names based on the Kafka names. Invalid characters are replaced and a hash is appended to the name. 5.2.2. Configuring a Kafka topic Use the properties of the KafkaTopic resource to configure a Kafka topic. You can use oc apply to create or modify topics, and oc delete to delete existing topics. For example: oc apply -f <topic-config-file> oc delete KafkaTopic <topic-name> This procedure shows how to create a topic with 10 partitions and 2 replicas. Before you start It is important that you consider the following before making your changes: Kafka does not support making the following changes through the KafkaTopic resource: Changing topic names using spec.topicName Decreasing partition size using spec.partitions You cannot use spec.replicas to change the number of replicas that were initially specified. Increasing spec.partitions for topics with keys will change how records are partitioned, which can be particularly problematic when the topic uses semantic partitioning . Prerequisites A running Kafka cluster configured with a Kafka broker listener using TLS authentication and encryption . A running Topic Operator (typically deployed with the Entity Operator ). For deleting a topic, delete.topic.enable=true (default) in the spec.kafka.config of the Kafka resource. Procedure Prepare a file containing the KafkaTopic to be created. An example KafkaTopic apiVersion: kafka.strimzi.io/v1beta1 kind: KafkaTopic metadata: name: orders labels: strimzi.io/cluster: my-cluster spec: partitions: 10 replicas: 2 Tip When modifying a topic, you can get the current version of the resource using oc get kafkatopic orders -o yaml . Create the KafkaTopic resource in OpenShift. oc apply -f TOPIC-CONFIG-FILE 5.2.3. Configuring the Topic Operator with resource requests and limits You can allocate resources, such as CPU and memory, to the Topic Operator and set a limit on the amount of resources it can consume. Prerequisites The Cluster Operator is running. Procedure Update the Kafka cluster configuration in an editor, as required: oc edit kafka MY-CLUSTER In the spec.entityOperator.topicOperator.resources property in the Kafka resource, set the resource requests and limits for the Topic Operator. apiVersion: kafka.strimzi.io/v1beta1 kind: Kafka spec: # Kafka and ZooKeeper sections... entityOperator: topicOperator: resources: requests: cpu: "1" memory: 500Mi limits: cpu: "1" memory: 500Mi Apply the new configuration to create or update the resource. oc apply -f KAFKA-CONFIG-FILE 5.3. Using the User Operator When you create, modify or delete a user using the KafkaUser resource, the User Operator ensures those changes are reflected in the Kafka cluster. The Deploying and Upgrading AMQ Streams on OpenShift guide provides instructions to deploy the User Operator: Using the Cluster Operator (recommended) Standalone to operate with Kafka clusters not managed by AMQ Streams For more information about the schema, see KafkaUser schema reference . Authenticating and authorizing access to Kafka Use KafkaUser to enable the authentication and authorization mechanisms that a specific client uses to access Kafka. For more information on using KafkUser to manage users and secure access to Kafka brokers, see Securing access to Kafka brokers . 5.3.1. Configuring the User Operator with resource requests and limits You can allocate resources, such as CPU and memory, to the User Operator and set a limit on the amount of resources it can consume. Prerequisites The Cluster Operator is running. Procedure Update the Kafka cluster configuration in an editor, as required: oc edit kafka MY-CLUSTER In the spec.entityOperator.userOperator.resources property in the Kafka resource, set the resource requests and limits for the User Operator. apiVersion: kafka.strimzi.io/v1beta1 kind: Kafka spec: # Kafka and ZooKeeper sections... entityOperator: userOperator: resources: requests: cpu: "1" memory: 500Mi limits: cpu: "1" memory: 500Mi Save the file and exit the editor. The Cluster Operator applies the changes automatically. 5.4. Monitoring operators using Prometheus metrics AMQ Streams operators expose Prometheus metrics. The metrics are automatically enabled and contain information about: Number of reconciliations Number of Custom Resources the operator is processing Duration of reconciliations JVM metrics from the operators Additionally, we provide an example Grafana dashboard. For more information about Prometheus, see the Introducing Metrics to Kafka in the Deploying and Upgrading AMQ Streams on OpenShift guide.

Commands:
env: - name: STRIMZI_NAMESPACE valueFrom: fieldRef: fieldPath: metadata.namespace
env: - name: STRIMZI_KUBERNETES_VERSION value: | major=1 minor=16 gitVersion=v1.16.2 gitCommit=c97fe5036ef3df2967d086711e6c0c405941e14b gitTreeState=clean buildDate=2019-10-15T19:09:08Z goVersion=go1.12.10 compiler=gc platform=linux/amd64
<cluster-name> -kafka-0. <cluster-name> -kafka-brokers. <namespace> .svc. cluster.local
apply -f install/cluster-operator/050-ConfigMap-strimzi-cluster-operator.yaml
edit cm strimzi-cluster-operator
apiVersion: v1 kind: ServiceAccount metadata: name: strimzi-cluster-operator labels: app: strimzi
apiVersion: apps/v1 kind: Deployment metadata: name: strimzi-cluster-operator labels: app: strimzi spec: replicas: 1 selector: matchLabels: name: strimzi-cluster-operator strimzi.io/kind: cluster-operator template: #
apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: strimzi-cluster-operator-namespaced labels: app: strimzi rules: - apiGroups: - "" resources: # The cluster operator needs to access and manage service accounts to grant Strimzi components cluster permissions - serviceaccounts verbs: - get - create - delete - patch - update - apiGroups: - "rbac.authorization.k8s.io" resources: # The cluster operator needs to access and manage rolebindings to grant Strimzi components cluster permissions - rolebindings verbs: - get - create - delete - patch - update - apiGroups: - "" resources: # The cluster operator needs to access and manage config maps for Strimzi components configuration - configmaps # The cluster operator needs to access and manage services to expose Strimzi components to network traffic - services # The cluster operator needs to access and manage secrets to handle credentials - secrets # The cluster operator needs to access and manage persistent volume claims to bind them to Strimzi components for persistent data - persistentvolumeclaims verbs: - get - list - watch - create - delete - patch - update - apiGroups: - "kafka.strimzi.io" resources: # The cluster operator runs the KafkaAssemblyOperator, which needs to access and manage Kafka resources - kafkas - kafkas/status # The cluster operator runs the KafkaConnectAssemblyOperator, which needs to access and manage KafkaConnect resources - kafkaconnects - kafkaconnects/status # The cluster operator runs the KafkaConnectS2IAssemblyOperator, which needs to access and manage KafkaConnectS2I resources - kafkaconnects2is - kafkaconnects2is/status # The cluster operator runs the KafkaConnectorAssemblyOperator, which needs to access and manage KafkaConnector resources - kafkaconnectors - kafkaconnectors/status # The cluster operator runs the KafkaMirrorMakerAssemblyOperator, which needs to access and manage KafkaMirrorMaker resources - kafkamirrormakers - kafkamirrormakers/status # The cluster operator runs the KafkaBridgeAssemblyOperator, which needs to access and manage BridgeMaker resources - kafkabridges - kafkabridges/status # The cluster operator runs the KafkaMirrorMaker2AssemblyOperator, which needs to access and manage KafkaMirrorMaker2 resources - kafkamirrormaker2s - kafkamirrormaker2s/status # The cluster operator runs the KafkaRebalanceAssemblyOperator, which needs to access and manage KafkaRebalance resources - kafkarebalances - kafkarebalances/status verbs: - get - list - watch - create - delete - patch - update - apiGroups: - "" resources: # The cluster operator needs to access and delete pods, this is to allow it to monitor pod health and coordinate rolling updates - pods verbs: - get - list - watch - delete - apiGroups: - "" resources: - endpoints verbs: - get - list - watch - apiGroups: # The cluster operator needs the extensions api as the operator supports Kubernetes version 1.11+ # apps/v1 was introduced in Kubernetes 1.14 - "extensions" resources: # The cluster operator needs to access and manage deployments to run deployment based Strimzi components - deployments - deployments/scale # The cluster operator needs to access replica sets to manage Strimzi components and to determine error states - replicasets # The cluster operator needs to access and manage replication controllers to manage replicasets - replicationcontrollers # The cluster operator needs to access and manage network policies to lock down communication between Strimzi components - networkpolicies # The cluster operator needs to access and manage ingresses which allow external access to the services in a cluster - ingresses verbs: - get - list - watch - create - delete - patch - update - apiGroups: - "apps" resources: # The cluster operator needs to access and manage deployments to run deployment based Strimzi components - deployments - deployments/scale - deployments/status # The cluster operator needs to access and manage stateful sets to run stateful sets based Strimzi components - statefulsets # The cluster operator needs to access replica-sets to manage Strimzi components and to determine error states - replicasets verbs: - get - list - watch - create - delete - patch - update - apiGroups: - "" resources: # The cluster operator needs to be able to create events and delegate permissions to do so - events verbs: - create - apiGroups: # OpenShift S2I requirements - apps.openshift.io resources: - deploymentconfigs - deploymentconfigs/scale - deploymentconfigs/status - deploymentconfigs/finalizers verbs: - get - list - watch - create - delete - patch - update - apiGroups: # OpenShift S2I requirements - build.openshift.io resources: - buildconfigs - builds verbs: - create - delete - get - list - patch - watch - update - apiGroups: # OpenShift S2I requirements - image.openshift.io resources: - imagestreams - imagestreams/status verbs: - create - delete - get - list - watch - patch - update - apiGroups: - networking.k8s.io resources: # The cluster operator needs to access and manage network policies to lock down communication between Strimzi components - networkpolicies verbs: - get - list - watch - create - delete - patch - update - apiGroups: - route.openshift.io resources: # The cluster operator needs to access and manage routes to expose Strimzi components for external access - routes - routes/custom-host verbs: - get - list - create - delete - patch - update - apiGroups: - policy resources: # The cluster operator needs to access and manage pod disruption budgets this limits the number of concurrent disruptions # that a Strimzi component experiences, allowing for higher availability - poddisruptionbudgets verbs: - get - list - watch - create - delete - patch - update
apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: strimzi-cluster-operator-global labels: app: strimzi rules: - apiGroups: - "rbac.authorization.k8s.io" resources: # The cluster operator needs to create and manage cluster role bindings in the case of an install where a user # has specified they want their cluster role bindings generated - clusterrolebindings verbs: - get - create - delete - patch - update - watch - apiGroups: - storage.k8s.io resources: # The cluster operator requires "get" permissions to view storage class details # This is because only a persistent volume of a supported storage class type can be resized - storageclasses verbs: - get - apiGroups: - "" resources: # The cluster operator requires "list" permissions to view all nodes in a cluster # The listing is used to determine the node addresses when NodePort access is configured # These addresses are then exposed in the custom resource states - nodes verbs: - list
apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: strimzi-kafka-broker labels: app: strimzi rules: - apiGroups: - "" resources: # The Kafka Brokers require "get" permissions to view the node they are on # This information is used to generate a Rack ID that is used for High Availability configurations - nodes verbs: - get
apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: strimzi-entity-operator labels: app: strimzi rules: - apiGroups: - "kafka.strimzi.io" resources: # The entity operator runs the KafkaTopic assembly operator, which needs to access and manage KafkaTopic resources - kafkatopics - kafkatopics/status # The entity operator runs the KafkaUser assembly operator, which needs to access and manage KafkaUser resources - kafkausers - kafkausers/status verbs: - get - list - watch - create - patch - update - delete - apiGroups: - "" resources: - events verbs: # The entity operator needs to be able to create events - create - apiGroups: - "" resources: # The entity operator user-operator needs to access and manage secrets to store generated credentials - secrets verbs: - get - list - create - patch - update - delete
apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: strimzi-kafka-client labels: app: strimzi rules: - apiGroups: - "" resources: # The Kafka clients (Connect, Mirror Maker, etc.) require "get" permissions to view the node they are on # This information is used to generate a Rack ID (client.rack option) that is used for consuming from the closest # replicas when enabled - nodes verbs: - get
apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: strimzi-cluster-operator labels: app: strimzi subjects: - kind: ServiceAccount name: strimzi-cluster-operator namespace: myproject roleRef: kind: ClusterRole name: strimzi-cluster-operator-global apiGroup: rbac.authorization.k8s.io
apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: strimzi-cluster-operator-kafka-broker-delegation labels: app: strimzi The Kafka broker cluster role must be bound to the cluster operator service account so that it can delegate the cluster role to the Kafka brokers. This must be done to avoid escalating privileges which would be blocked by Kubernetes. subjects: - kind: ServiceAccount name: strimzi-cluster-operator namespace: myproject roleRef: kind: ClusterRole name: strimzi-kafka-broker apiGroup: rbac.authorization.k8s.io
apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata: name: strimzi-cluster-operator-kafka-client-delegation labels: app: strimzi The Kafka clients cluster role must be bound to the cluster operator service account so that it can delegate the cluster role to the Kafka clients using it for consuming from closest replica. This must be done to avoid escalating privileges which would be blocked by Kubernetes. subjects: - kind: ServiceAccount name: strimzi-cluster-operator namespace: myproject roleRef: kind: ClusterRole name: strimzi-kafka-client apiGroup: rbac.authorization.k8s.io
apiVersion: rbac.authorization.k8s.io/v1 kind: RoleBinding metadata: name: strimzi-cluster-operator labels: app: strimzi subjects: - kind: ServiceAccount name: strimzi-cluster-operator namespace: myproject roleRef: kind: ClusterRole name: strimzi-cluster-operator-namespaced apiGroup: rbac.authorization.k8s.io
apiVersion: rbac.authorization.k8s.io/v1 kind: RoleBinding metadata: name: strimzi-cluster-operator-entity-operator-delegation labels: app: strimzi The Entity Operator cluster role must be bound to the cluster operator service account so that it can delegate the cluster role to the Entity Operator. This must be done to avoid escalating privileges which would be blocked by Kubernetes. subjects: - kind: ServiceAccount name: strimzi-cluster-operator namespace: myproject roleRef: kind: ClusterRole name: strimzi-entity-operator apiGroup: rbac.authorization.k8s.io
apiVersion: kafka.strimzi.io/v1beta1 kind: KafkaTopic metadata: name: topic-name-1 labels: strimzi.io/cluster: my-cluster
apiVersion: {KafkaApiVersion} kind: KafkaTopic metadata: name: topic-name-1 spec: topicName: topicName-1 1 #
apiVersion: {KafkaApiVersion} kind: KafkaTopic metadata: name: topic-name-1 spec: topicName: name-2 #
apiVersion: kafka.strimzi.io/v1beta1 kind: KafkaTopic metadata: name: orders labels: strimzi.io/cluster: my-cluster spec: partitions: 10 replicas: 2
apply -f TOPIC-CONFIG-FILE
edit kafka MY-CLUSTER
apiVersion: kafka.strimzi.io/v1beta1 kind: Kafka spec: # Kafka and ZooKeeper sections entityOperator: topicOperator: resources: requests: cpu: "1" memory: 500Mi limits: cpu: "1" memory: 500Mi
apply -f KAFKA-CONFIG-FILE
edit kafka MY-CLUSTER
apiVersion: kafka.strimzi.io/v1beta1 kind: Kafka spec: # Kafka and ZooKeeper sections entityOperator: userOperator: resources: requests: cpu: "1" memory: 500Mi limits: cpu: "1" memory: 500Mi