Triggers

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

The subscriber value must be a Destination.

Example Triggers

The following trigger receives all the events from the default broker and delivers them to the Knative Serving service my-service:

1. Create a YAML file using the following example:

   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
   

2. Apply the YAML file by running the command:

   kubectl apply -f <filename>.yaml
   

   Where <filename> is the name of the file you created in the previous step.

The following trigger receives all the events from the default broker and delivers them to the custom path /my-custom-path for the Kubernetes service my-service:

1. Create a YAML file using the following example:

   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
   

2. Apply the YAML file by running the command:

   kubectl apply -f <filename>.yaml
   

   Where <filename> is the name of the file you created in the previous step.

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.

1. Create a YAML file using the following example:

   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
   

2. Apply the YAML file by running the command:

   kubectl apply -f <filename>.yaml
   

   Where <filename> is the name of the file you created in the previous step.