Kubernetes: Can't delete PersistentVolumeClaim

问题:

I created the following persistent volume by calling

kubectl create -f nameOfTheFileContainingTheFollowingContent.yaml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-monitoring-static-content
spec:
  capacity:
    storage: 100Mi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/some/path"

---

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pv-monitoring-static-content-claim
spec:
  accessModes:
    - ReadWriteOnce
  storageClassName: ""
  resources:
    requests:
      storage: 100Mi

After this I tried to delete the pvc. But this command stuck. when calling kubectl describe pvc pv-monitoring-static-content-claim I get the following result

Name:          pv-monitoring-static-content-claim
Namespace:     default
StorageClass:
Status:        Terminating (lasts 5m)
Volume:        pv-monitoring-static-content
Labels:        <none>
Annotations:   pv.kubernetes.io/bind-completed=yes
               pv.kubernetes.io/bound-by-controller=yes
Finalizers:    [foregroundDeletion]
Capacity:      100Mi
Access Modes:  RWO
Events:        <none>

And for kubectl describe pv pv-monitoring-static-content

Name:            pv-monitoring-static-content
Labels:          <none>
Annotations:     pv.kubernetes.io/bound-by-controller=yes
Finalizers:      [kubernetes.io/pv-protection foregroundDeletion]
StorageClass:
Status:          Terminating (lasts 16m)
Claim:           default/pv-monitoring-static-content-claim
Reclaim Policy:  Retain
Access Modes:    RWO
Capacity:        100Mi
Node Affinity:   <none>
Message:
Source:
    Type:          HostPath (bare host directory volume)
    Path:          /some/path
    HostPathType:
Events:            <none>

There is no pod running that uses the persistent volume. Could anybody give me a hint why the pvc and the pv are not deleted?

回答1:

This happens when persistent volume is protected. You should be able to cross verify this:

Command:

kubectl describe pvc PVC_NAME | grep Finalizers

Output:

Finalizers: [kubernetes.io/pvc-protection]

You can fix this by setting finalizers to null using kubectl patch:

kubectl patch pvc PVC_NAME -p '{"metadata":{"finalizers": []}}' --type=merge

Ref; Storage Object in Use Protection

回答2:

I'm not sure why this happened, but after deleting the finalizers of the pv and the pvc via the kubernetes dashboard, both were deleted. This happened again after repeating the steps I described in my question. Seems like a bug.

回答3:

The PV is protected. Delete the PV before deleting the PVC. Also, delete any pods/ deployments which are claiming any of the referenced PVCs. For further information do check out Storage Object in Use Protection

回答4:

You can get rid of editing your pvc! Remove pvc protection.

1. kubectl edit pvc YOUR_PVC -n NAME_SPACE
2. Manually edit and put # before this line
3. All pv and pvc will be deleted

回答5:

If PV still exists it may be because it has ReclaimPolicy set to Retain in which case it won't be deleted even if PVC is gone. From the docs:

PersistentVolumes can have various reclaim policies, including “Retain”, “Recycle”, and “Delete”. For dynamically provisioned PersistentVolumes, the default reclaim policy is “Delete”. This means that a dynamically provisioned volume is automatically deleted when a user deletes the corresponding PersistentVolumeClaim. This automatic behavior might be inappropriate if the volume contains precious data. In that case, it is more appropriate to use the “Retain” policy. With the “Retain” policy, if a user deletes a PersistentVolumeClaim, the corresponding PersistentVolume is not be deleted. Instead, it is moved to the Released phase, where all of its data can be manually recovered

回答6:

Just met this issue hours ago.

I deleted deployments that used this references and the PV/PVCs are automatically terminated.

回答7:

In my case, as long as I delete the pod associated to both pv and pvc, the pv and pvc in terminating status are gone

回答8:

in my case a pvc was not deleted because missing namespace (I deleted the namespace before deleting all resources/pvc) solution : create namespace with the same name as it was before and then I was able to remove the finalizers and finally pvc