Stuff I forget

Reusing a PVC

12 Sep 2021 | tags: Kubernetes

Rationale TL;DR

Let’s suppose we have a PV and we need to attach it to a new PVC. Let’s suppose the PVC was claimed by a POD which does not exist anymore.

The solution

In this situation, the PV should be in the Released state:

pvc-ee8e4b8e-28d6-40dd-bfe8-a5affb6bc9d9   10Gi       RWO            Retain           Released   my-namespace/grafana                                     kops-ssd-1-17            352d

Of course, the Reclaim policy should be Retained otherwise there wouldn’t be the PV at all :)

We need to edit the PV and remove the claimRef field. That would make the volume Available:

pvc-ee8e4b8e-28d6-40dd-bfe8-a5affb6bc9d9   10Gi       RWO            Retain           Available           kops-ssd-1-17            352d

The next thing we need to do is create a yaml file file with the following contents (your milleage may vary, the relevant thing is to use the right PV in the claim):

---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: grafana
  namespace: my-namespace
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
  volumeName: pvc-ee8e4b8e-28d6-40dd-bfe8-a5affb6bc9d9

That should create a claim and attach it to the old PV:

# kubectl get pvc
NAME      STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS    AGE
grafana   Bound    pvc-ee8e4b8e-28d6-40dd-bfe8-a5affb6bc9d9   10Gi       RWO            kops-ssd-1-17   10m

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