This section is to describe about the graceful deletion/uninstall of your OpenEBS cluster. OpenEBS cluster has two different storage engine,Jiva and cStor. The deletion for the data from the disks after this operation is different for both of these storage Engine.
Uninstall OpenEBS Gracefully
The recommended steps to uninstall the OpenEBS cluster gracefully is as follows.
Delete all the OpenEBS PVCs that were created. You can check the status of PVC using the following command
kubectl get pvc
There should not have any entries of OpenEBS PVC.
Delete all the SPCs (In case of cStor storage engine)
kubectl get spc -n openebs
There should not have any entries of OpenEBS SPC.
Ensure that no volume or pool pods are in terminating state . You can check the running status of Pods using the following command.
kubectl get pods -n <openebs namespace>
Delete the OpenEBS namespace either via helm purge or
kubectl delete ns openebs.
Uninstalling the OpenEBS doesn't automatically delete the CRDs that were created. If you would like to complete remove the CRDs and the associated objects, run the following commands:
kubectl delete crd castemplates.openebs.io kubectl delete crd cstorpools.openebs.io kubectl delete crd cstorvolumereplicas.openebs.io kubectl delete crd cstorvolumes.openebs.io kubectl delete crd runtasks.openebs.io kubectl delete crd storagepoolclaims.openebs.io kubectl delete crd storagepools.openebs.io kubectl delete crd volumesnapshotdatas.volumesnapshot.external-storage.k8s.io kubectl delete crd volumesnapshots.volumesnapshot.external-storage.k8s.io
As part of deleting the Jiva Volumes, OpenEBS launches scrub jobs for clearing the data from the nodes. The completed jobs need to be cleared using the following command.
kubectl delete jobs -l openebs.io/cas-type=jiva -n <namespace>
Note: Sometimes, there are chances that cStor volumes will not get deleted. Below workaround will resolve this issue. Perform the following command.
kubectl edit cvr -n openebs
And then remove finalizers from the CVR. Need to remove following entries and save it.
finalizers: - cstorvolumereplica.openebs.io/finalizer
This will automatically remove the pending CVR entries and delete the cStor volume completely.