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Creating a channel using cluster or namespace defaults
Developers can create channels of any supported implementation type by creating an instance of a Channel object.
Create a Channel object:
apiVersion: messaging.knative.dev/v1 kind: Channel metadata: name: my-channel namespace: default
Since this object is created in the
defaultnamespace, according to the default ConfigMap example in the previous section, it will be an InMemoryChannel channel implementation.
After the Channel object is created, a mutating admission webhook sets the
spec.channelTemplatebased on the default channel implementation:
apiVersion: messaging.knative.dev/v1 kind: Channel metadata: name: my-channel namespace: default spec: channelTemplate: apiVersion: messaging.knative.dev/v1 kind: InMemoryChannel
spec.channelTemplateproperty cannot be changed after creation, since it is set by the default channel mechanism, not the user.
The channel controller creates a backing channel instance based on the
When this mechanism is used, two objects are created, a generic Channel object, and an InMemoryChannel object. The generic object acts as a proxy for the InMemoryChannel object, by copying its subscriptions to and setting its status to that of the InMemoryChannel object.
NOTE: Defaults only apply on object creation. Defaults are applied by the webhook only on Channel or Sequence creation. If the default settings change, the new defaults will only apply to newly-created channels, brokers, or sequences. Existing ones will not change.
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