6.4. Default channel implementation

Prerequisites

• You have administrator permissions on OpenShift Container Platform.
• You have installed the OpenShift Serverless Operator and Knative Eventing on your cluster.
• If you want to use Knative channels for Apache Kafka as the default channel implementation, you must also install the KnativeKafka CR on your cluster.

Procedure

• Modify the KnativeEventing custom resource to add configuration details for the default-ch-webhook config map:

  apiVersion: operator.knative.dev/v1beta1
  kind: KnativeEventing
  metadata:
    name: knative-eventing
    namespace: knative-eventing
  spec:
    config: 

  1

  
      default-ch-webhook: 

  2

  
        default-ch-config: |
          clusterDefault: 

  3

  
            apiVersion: messaging.knative.dev/v1
            kind: InMemoryChannel
            spec:
              delivery:
                backoffDelay: PT0.5S
                backoffPolicy: exponential
                retry: 5
          namespaceDefaults: 

  4

  
            my-namespace:
              apiVersion: messaging.knative.dev/v1beta1
              kind: KafkaChannel
              spec:
                numPartitions: 1
                replicationFactor: 1

  1

  In spec.config, you can specify the config maps that you want to add modified configurations for.

  2

  The default-ch-webhook config map can be used to specify the default channel implementation for the cluster or for one or more namespaces.

  3

  The cluster-wide default channel type configuration. In this example, the default channel implementation for the cluster is InMemoryChannel.

  4

  The namespace-scoped default channel type configuration. In this example, the default channel implementation for the my-namespace namespace is KafkaChannel.

  重要

  Configuring a namespace-specific default overrides any cluster-wide settings.