Configuring the Eventing Operator custom resource

    NOTE: Kubernetes spec level policies cannot be configured using the Knative Operators.

    Cluster administrators can install a specific version of Knative Eventing by using the field. For example, if you want to install Knative Eventing v0.19.0, you can apply the following KnativeEventing CR:

    If spec.version is not specified, the Knative Operator will install the latest available version of Knative Eventing. If users specify an invalid or unavailable version, the Knative Operator will do nothing. The Knative Operator always includes the latest 3 minor release versions.

    If Knative Eventing is already managed by the Operator, updating the spec.version field in the KnativeEventing CR enables upgrading or downgrading the Knative Eventing version, without requiring modifications to the Operator.

    Note that the Knative Operator only permits upgrades or downgrades by one minor release version at a time. For example, if the current Knative Eventing deployment is version 0.18.x, you must upgrade to 0.19.x before upgrading to 0.20.x.

    Configuring Knative Eventing using ConfigMaps

    The Operator manages the Knative Eventing installation. It overwrites any updates to ConfigMaps which are used to configure Knative Eventing. The KnativeEventing CR allows you to set values for these ConfigMaps by using the Operator.

    All Knative Eventing ConfigMaps are created in the same namespace as the KnativeEventing CR. You can use the KnativeEventing CR as a unique entry point to edit all ConfigMaps.

    Knative Eventing has multiple ConfigMaps that are named with the prefix config-. The spec.config in the KnativeEventing CR has one <name> entry for each ConfigMap, named config-<name>, with a value which will be used for the ConfigMap data.

    If you are using a channel-based broker, you can change the default channel type for the broker from InMemoryChannel to KafkaChannel, by updating the config-br-default-channel ConfigMap. You can do this by modifying the KnativeEventing CR:

    1. apiVersion: operator.knative.dev/v1alpha1
    2. kind: KnativeEventing
    3. metadata:
    4.   name: knative-eventing
    5.   namespace: knative-eventing
    6. spec:
    7.   config:
    8.     default-ch-webhook:
    9.       default-ch-config: |
    10.         clusterDefault:
    11.           apiVersion: messaging.knative.dev/v1beta1
    12.           kind: KafkaChannel
    13.           spec:
    14.             numPartitions: 10
    15.             replicationFactor: 1
    16.         namespaceDefaults:
    17.           my-namespace:
    18.             apiVersion: messaging.knative.dev/v1
    19.             kind: InMemoryChannel
    20.             spec:
    21.               delivery:
    22.                 backoffDelay: PT0.5S
    23.                 backoffPolicy: exponential

    NOTE: The clusterDefault setting determines the global, cluster-wide default channel type. You can configure channel defaults for individual namespaces by using the namespaceDefaults setting.

    The Knative Eventing Operator CR is configured the same way as the Knative Serving Operator CR. See the documentation on .

    List of containers within each Deployment resource:

    The default field can still be used to replace the images in a predefined format. However, if the container name is not a unique identifier, for example eventing-controller, you must use the override field to replace it, by specifying deployment/container as the unique key.

    Some images are defined by using the environment variable in Knative Eventing. They can be replaced by taking advantage of the override field.

    This example shows how you can define custom image links that can be defined in the KnativeEventing CR using the simplified format .

    In the example below:

    • The custom tag latest is used for all images.
    • All image links are accessible without using secrets.
    • Images are defined in the accepted format docker.io/knative-images/${NAME}:{CUSTOM-TAG}.
    1. Push images to the following image tags:
    1. Define your the KnativeEventing CR with following content:
    1. apiVersion: operator.knative.dev/v1alpha1
    2. kind: KnativeEventing
    3. metadata:
    4.   name: knative-eventing
    5.   namespace: knative-eventing
    6. spec:
    7.   registry:
    8.     default: docker.io/knative-images/${NAME}:latest
    9.     override:
    10.       broker-controller/eventing-controller: docker.io/knative-images-repo1/broker-eventing-controller:latest

    If your custom image links are not defined in a uniform format, you will need to individually include each link in the KnativeEventing CR.

    For example, to define the following list of images:

    The KnativeEventing CR must be modified to include the full list. For example:

    1. apiVersion: operator.knative.dev/v1alpha1
    2. kind: KnativeEventing
    3. metadata:
    4.   name: knative-eventing
    5.   namespace: knative-eventing
    6. spec:
    7.   registry:
    8.     override:
    9.       eventing-controller/eventing-controller: docker.io/knative-images-repo1/eventing-controller:latest
    10.       eventing-webhook/eventing-webhook: docker.io/knative-images-repo2/eventing-webhook:latest
    11.       imc-controller/controller: docker.io/knative-images-repo3/imc-controller:latest
    12.       imc-dispatcher/dispatcher: docker.io/knative-images-repo4/imc-dispatcher:latest
    13.       broker-controller/eventing-controller: docker.io/knative-images-repo5/broker-eventing-controller:latest

    If you want to replace the image defined by the environment variable, you must modify the KnativeEventing CR. For example, if you want to replace the image defined by the environment variable , in the container controller, of the deployment imc-controller, and the target image is docker.io/knative-images-repo5/DISPATCHER_IMAGE:latest, the KnativeEventing CR would be as follows:

    1. apiVersion: operator.knative.dev/v1alpha1
    2. kind: KnativeEventing
    3. metadata:
    4.   name: knative-eventing
    5.   namespace: knative-eventing
    6.   registry:
    7.     override:
    8.       eventing-controller/eventing-controller: docker.io/knative-images-repo1/eventing-controller:latest
    9.       eventing-webhook/eventing-webhook: docker.io/knative-images-repo2/eventing-webhook:latest
    10.       imc-controller/controller: docker.io/knative-images-repo3/imc-controller:latest
    11.       imc-dispatcher/dispatcher: docker.io/knative-images-repo4/imc-dispatcher:latest
    12.       broker-controller/eventing-controller: docker.io/knative-images-repo5/broker-eventing-controller:latest
    13.       DISPATCHER_IMAGE: docker.io/knative-images-repo5/DISPATCHER_IMAGE:latest

    If your image repository requires private secrets for access, you must append the imagePullSecrets attribute to the KnativeEventing CR.

    This example uses a secret named regcred. Refer to the Kubernetes documentation to create your own private secrets.

    The field imagePullSecrets requires a list of secrets. You can add multiple secrets to access the images:

    1. apiVersion: operator.knative.dev/v1alpha1
    2. kind: KnativeEventing
    3. metadata:
    4.   name: knative-eventing
    5.   namespace: knative-eventing
    6. spec:
    7.   registry:
    8.     ...
    9.     imagePullSecrets:
    10.       - name: regcred
    11.       - name: regcred-2
    12.       ...

    Configuring the default broker class

    Knative Eventing allows you to define a default broker class when the user does not specify one. The Operator provides two broker classes by default: ChannelBasedBroker and MTChannelBasedBroker.

    The field defaultBrokerClass indicates which class to use; if empty, the ChannelBasedBroker is used.

    The following example CR specifies MTChannelBasedBroker as the default:

    1. apiVersion: operator.knative.dev/v1alpha1
    2. kind: KnativeEventing
    3. metadata:
    4.   name: knative-eventing
    5.   namespace: knative-eventing
    6. spec:
    7.   defaultBrokerClass: MTChannelBasedBroker

    The KnativeEventing CR allows you to configure system resources for Knative system containers.

    Requests and limits can be configured for the following containers:

    • eventing-controller
    • eventing-webhook
    • imc-controller
    • imc-dispatcher
    • mt-broker-ingress
    • mt-broker-ingress

    To override resource settings for a specific container, you must create an entry in the spec.resources list with the container name and the Kubernetes resource settings.

    For example, the following KnativeEventing CR configures the eventing-webhook container to request 0.3 CPU and 100MB of RAM, and sets hard limits of 1 CPU, 250MB RAM, and 4GB of local storage:

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