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Knative Eventing Sugar Controller
Knative Eventing Sugar Controller will react to special labels and annotations to produce or control eventing resources in a cluster or namespace. This allows cluster operators and developers to focus on creating fewer resources, and the underlying eventing infrastructure is created on-demand, and cleaned up when no longer needed.
The following command installs the Eventing Sugar Controller:
kubectl apply --filename https://github.com/knative/eventing/releases/download/v0.22.0/eventing-sugar-controller.yaml
Automatic Broker Creation
One way to create a Broker is to manually apply a resource to a cluster using the default settings:
kubectl create -f - <<EOF apiVersion: eventing.knative.dev/v1 kind: Broker metadata: name: default namespace: default EOF
There might be cases where automated Broker creation is desirable, such as on namespace creation, or on Trigger creation. The Sugar controller enables those use-cases:
- When a Namespace is labeled with
eventing.knative.dev/injection=enabled, the sugar controller will create a default Broker named “default” in that namespace.
- When a Trigger is annotated with
eventing.knative.dev/injection=enabled, the controller will create a Broker named by that Trigger in the Trigger’s Namespace.
When a Broker is deleted and the above labels or annotations are in-use, the Sugar Controller will automatically recreate a default Broker.
Creating a “default” Broker when creating a Namespace:
kubectl apply -f - <<EOF apiVersion: v1 kind: Namespace metadata: name: example labels: eventing.knative.dev/injection: enabled EOF
To automatically create a Broker after a namespace exists, label the Namespace:
kubectl label namespace default eventing.knative.dev/injection=enabled
If the Broker named “default” already exists in the Namespace, the Sugar Controller will do nothing.
Create a Broker named by a Trigger (
spec.broker) in the Trigger’s Namespace:
kubectl apply -f - << EOF apiVersion: eventing.knative.dev/v1 kind: Trigger metadata: name: hello-sugar namespace: hello annotations: eventing.knative.dev/injection: enabled spec: broker: sugar subscriber: ref: apiVersion: v1 kind: Service name: event-display EOF
Note: If the named Broker already exists, the Sugar controller will do nothing, and the Trigger will not own the existing Broker.
This will make a Broker called “sugar” in the Namespace “hello”, and attempt to send events to the “event-display” service.
If the Broker of the given name already exists in the Namespace, the Sugar Controller will do nothing.