docs/docs/eventing/broker/triggers

title	weight	type	showlandingtoc	aliases
Triggers	02	docs	false	docs/eventing/triggers

Triggers

A trigger represents a desire to subscribe to events from a specific broker.

The subscriber value must be a Destination.

Simple example which will receive all the events from the given (default) broker and deliver them to Knative Serving service my-service:

kubectl create -f - <<EOF
apiVersion: eventing.knative.dev/v1
kind: Trigger
metadata:
  name: my-service-trigger
spec:
  broker: default
  subscriber:
    ref:
      apiVersion: serving.knative.dev/v1
      kind: Service
      name: my-service
EOF

Simple example which will receive all the events from the given (default) broker and deliver them to the custom path /my-custom-path for the Kubernetes service my-service:

kubectl create -f - <<EOF
apiVersion: eventing.knative.dev/v1
kind: Trigger
metadata:
  name: my-service-trigger
spec:
  broker: default
  subscriber:
    ref:
      apiVersion: v1
      kind: Service
      name: my-service
    uri: /my-custom-path
EOF

Trigger filtering

Exact match filtering on any number of CloudEvents attributes as well as extensions are supported. If your filter sets multiple attributes, an event must have all of the attributes for the trigger to filter it. Note that we only support exact matching on string values.

Example

This example filters events from the default broker that are of type dev.knative.foo.bar and have the extension myextension with the value my-extension-value.

kubectl create -f - <<EOF
apiVersion: eventing.knative.dev/v1
kind: Trigger
metadata:
  name: my-service-trigger
spec:
  broker: default
  filter:
    attributes:
      type: dev.knative.foo.bar
      myextension: my-extension-value
  subscriber:
    ref:
      apiVersion: serving.knative.dev/v1
      kind: Service
      name: my-service
EOF