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OCM-Subscription-Pause.md

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Ability to pause a Subscription on PlacementRule change when it has the added ramen label

Code changes

New label

  • Subscription CR to contain added label, as below, to trigger pause functionality: 
    metadata:
  labels:
    ramendr: protected
  • Subscription will be paused if PlacementRule change triggres a reconcile of the subscription, or deployable. The Subscription will get an added label as follows, 
    metadata:
  labels:
    ramendr: protected
    subscription-pause: "true"

To unpause subscription, edit the subscription and remove the label named subscription-pause

To trigger a placement rule change, edit the placement rule for the subscription to change the cluster label. NOTE: Ideally the test would be to turn-off/disconnect current managedcluster on which Subscription is placed, for DR tests

Build and deploy

  • Clone above repositories, change to branch pause-on-plchange
  • Build: TRAVIS_BUILD=0 make build-images
    • Builds local images named,
      • quay.io/open-cluster-management/multicluster-operators-deployable:canary
      • quay.io/open-cluster-management/multicluster-operators-subscription:canary
  • Copy image to minikube cluster, or push to cluster of choice
  • Change the following deployments on the HUB to pick the new image,
    • deployment: multicluster-operators-application namespace: multicluster-operators
      • Update image,
        • From: image: quay.io/open-cluster-management/multicluster-operators-deployable:community-latest
        • To: image: quay.io/open-cluster-management/multicluster-operators-deployable:canary
      • Update imagePullPolicy to "Never" for the container using the above image
    • deployment: multicluster-operators-subscription namespace: multicluster-operators
      • Update image,
        • From: image: quay.io/open-cluster-management/multicluster-operators-subscription:community-latest
        • To: image: quay.io/open-cluster-management/multicluster-operators-subscription:canary
      • Update imagePullPolicy to "Never" for the container using the above image
  • Restart the deployments (although the change should trigger the same)

Gotchas

  • Subscription does not start paused, as it seems not triggered by a PlacementRule
  • Shutting down the managed cluster for the subscription does move the Subscription to another available managed cluster, but takes time to detect this
  • Restarting the managed cluster that was down, does not seem to be removing the workload on the cluster
    • Need to retest without the changes to pause to ensure core understanding is correct