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You can use the default-ch-webhook config map to specify the default channel implementation of Knative Eventing. You can specify the default channel implementation for the entire cluster or for one or more namespaces. Currently the InMemoryChannel and KafkaChannel channel types are supported.

Configuring the default channel implementation

Prerequisites
  • You have administrator permissions on Red Hat OpenShift Service on AWS.

  • You have installed the OpenShift Serverless Operator and Knative Eventing on your cluster.

  • If you want to use Kafka channels 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/v1alpha1
    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.

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