Using the broker - Knative Eventing | Serverless applications

Creating a broker manually
Creating a broker automatically using namespace annotation
Deleting a broker that was created using namespace annotation

Knative Eventing uses the default broker unless otherwise specified.

If you have cluster administrator permissions, you can create the default broker automatically using namespace annotation.

All other users must create a broker using the manual process as described in this guide.

Creating a broker manually

To create a broker, you must create a service account for each namespace, and give that service account the required RBAC permissions.

Prerequisites

Knative Eventing installed, which includes the ClusterRole.

Procedure

Create the ServiceAccount objects.
1. Create the eventing-broker-ingress object by entering the following command:
  $ oc -n <namespace> create serviceaccount eventing-broker-ingress
2. Create the eventing-broker-filter object by entering the following command:
  $ oc -n <namespace> create serviceaccount eventing-broker-filter

Give the objects that you have created RBAC permissions:

$ oc -n default create rolebinding eventing-broker-ingress \
  --clusterrole=eventing-broker-ingress \
  --serviceaccount=default:eventing-broker-ingress

$ oc -n default create rolebinding eventing-broker-filter \
  --clusterrole=eventing-broker-filter \
  --serviceaccount=default:eventing-broker-filter

Create a broker by creating and applying a YAML file containing the following:
```
apiVersion: eventing.knative.dev/v1beta1
kind: Broker
metadata:
  namespace: default
  name: default (1)
```
1 This example uses the name default, but you can replace this with any other valid name.

Creating a broker automatically using namespace annotation

If you have cluster administrator permissions, you can create a broker automatically by annotating a namespace.

Prerequisites

Knative Eventing installed.
Cluster administrator permissions for OpenShift Container Platform.

Procedure

Annotate your namespace by entering the following commands:
```
$ oc label namespace default knative-eventing-injection=enabled (1)
$ oc -n default get broker default
```
1 Replace default with the desired namespace.

The line shown in this example will automatically create a broker named default in the default namespace.

Brokers created due to annotation will not be removed if you remove the annotation. You must manually delete them.

Deleting a broker that was created using namespace annotation

Delete the injected broker from the selected namespace (in this example, the default namespace):
```
$ oc -n default delete broker default
```

Using brokers with Knative Eventing

Creating a broker manually

Creating a broker automatically using namespace annotation

Deleting a broker that was created using namespace annotation