Chapter 11. Relocating an application between managed clusters

A relocation operation is very similar to failover. Relocate is application based and uses the DRPlacementControl to trigger the relocation. The main difference for relocation is that a resync is issued to make sure any new application data saved on the Secondary managed cluster is immediately, not waiting for the mirroring schedule interval, replicated to the Primary managed cluster.

Procedure

  1. On the Hub cluster navigate to Installed Operators and then click Openshift DR Hub Operator.
  2. Click DRPlacementControl tab.
  3. Click DRPC busybox-drpc and then the YAML view.
  4. Modify action to Relocate

    DRPlacementControl modify action to Relocate

    Image show where to modify the action in the YAML view

  5. Click Save.
  6. Verify if the application busybox is now running in the Primary managed cluster, failover cluster ocp4perf2 specified in the YAML file.

    $ oc get pods,pvc -n busybox-sample

    Example output:

    NAME          READY   STATUS    RESTARTS   AGE
    pod/busybox   1/1     Running   0          60s
    
    NAME                                STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS                  AGE
    persistentvolumeclaim/busybox-pvc   Bound    pvc-79f2a74d-6e2c-48fb-9ed9-666b74cfa1bb   5Gi        RWO            ocs-storagecluster-ceph-rbd   61s
  7. Verify if busybox is running in the Secondary managed cluster. The busybox application should no longer be running on this managed cluster.

    $ oc get pods,pvc -n busybox-sample

    Example output:

    No resources found in busybox-sample namespace.
Important

Be aware of known Regional-DR issues as documented in Known Issues section of Release Notes.

If you need assistance with developer preview features, reach out to the ocs-devpreview@redhat.com mailing list and a member of the Red Hat Development Team will assist you as quickly as possible based on availability and work schedules.