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Managing subscriptions - Eventing | Serverless | OpenShift Container Platform 4.9
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Managing subscriptions

Describing subscriptions by using the Knative cli

You can use the kn subscription describe command to print information about a subscription in the terminal by using the Knative (kn) cli. Using the Knative cli to describe subscriptions provides a more streamlined and intuitive user interface than viewing YAML files directly.

Prerequisites

  • You have installed the Knative (kn) cli.

  • You have created a subscription in your cluster.

Procedure

  • Describe a subscription:

    $ kn subscription describe <subscription_name>
    Example output
    Name:            my-subscription
Namespace:       default
Annotations:     messaging.knative.dev/creator=openshift-user, messaging.knative.dev/lastModifier=min ...
Age:             43s
Channel:         Channel:my-channel (messaging.knative.dev/v1)
Subscriber:
  URI:           http://edisplay.default.example.com
Reply:
  Name:          default
  Resource:      Broker (eventing.knative.dev/v1)
DeadLetterSink:
  Name:          my-sink
  Resource:      Service (serving.knative.dev/v1)

Conditions:
  OK TYPE                  AGE REASON
  ++ Ready                 43s
  ++ AddedToChannel        43s
  ++ ChannelReady          43s
  ++ ReferencesResolved    43s

Listing subscriptions by using the Knative cli

You can use the kn subscription list command to list existing subscriptions on your cluster by using the Knative (kn) cli. Using the Knative cli to list subscriptions provides a streamlined and intuitive user interface.

Prerequisites

  • You have installed the Knative (kn) cli.

Procedure

  • List subscriptions on your cluster:

    $ kn subscription list
    Example output
    NAME             CHANNEL             SUBSCRIBER           REPLY   DEAD LETTER SINK   READY   REASON
mysubscription   Channel:mychannel   ksvc:event-display                              True

Updating subscriptions by using the Knative cli

You can use the kn subscription update command as well as the appropriate flags to update a subscription from the terminal by using the Knative (kn) cli. Using the Knative cli to update subscriptions provides a more streamlined and intuitive user interface than updating YAML files directly.

Prerequisites

  • You have installed the Knative (kn) cli.

  • You have created a subscription.

Procedure

  • Update a subscription:

    $ kn subscription update <subscription_name> \
  --sink <sink_prefix>:<sink_name> \ (1)
  --sink-dead-letter <sink_prefix>:<sink_name> (2)
    1 --sink specifies the updated target destination to which the event should be delivered. You can specify the type of the sink by using one of the following prefixes:
    ksvc

    A Knative service.

    channel

    A channel that should be used as destination. Only default channel types can be referenced here.

    broker

    An Eventing broker.
    2 Optional: --sink-dead-letter is an optional flag that can be used to specify a sink which events should be sent to in cases where events fail to be delivered. For more information, see the OpenShift Serverless Event delivery documentation.
    Example command
    $ kn subscription update mysubscription --sink ksvc:event-display