OE:
RECLAIMING A PV
this is a scenario I’ve run into and which wasn’t covered in the course and I’m pretty sure others have as well. You have a PV that is bound to a PVC and you then want to
• detach it from the PVC because you created the PVC in the wrong namespace
• reuse the PV because the pod that was using it is no longer using it
in either case, the solution is easy. Just edit the pv:
$ k edit pv pv-1
and then delete the claimRef section highlighted below. You’ll then be able to bind it to another PVC
Hsinhom:
why not just delete the pvc from the wrong namespace?
OE:
Deleting the PVC doesn’t make the PV available. You have to manually edit the PV to make it usable again
Daniel Zilberman:
@OE to be fair, that behavior (releasing PV from PVC that “claimed” some of its resources) is also controlled by reclaim policy, as illustrated here: https://kubernetes.io/docs/tasks/administer-cluster/change-pv-reclaim-policy/. Perhaps “Recycle” reclaim policy would work for your scenario? I recall that in the course labs we had to first delete pod that uses PVC as a Volume and then delete PVC itself so that PV resource was available again…
OE:
Even when you delete the pod + PVC, if the policy is recycle, the PV is not available. Test it out and tell me. But from what I looked at it, you had to manually remove the claim even after deleting the PVC + pod
