Kubernetes - PVC / PV

Primitives: PersistentVolumeClaim, PersistentVolume, StorageClass, VolumeSnapshot (requires CSI driver support).

Kubernetes supports two volumeModes of PersistentVolumes: Filesystem (default) and Block.

PVC in "Lost" Status

If you delete a PV, the coresponding PVC status will be changed from Bound to Lost.

If a PVC is in lost state, try to delete this PVC's annoation, it will make the PVC rebind:

"annotations": {
    "pv.kubernetes.io/bind-completed": "yes"
},

PV in "Released" Status

If PV is stuck in Released Status, remove the .spec.claimRef => PV should change to "Available", then it may be "Bound"

Relationships

• StorageClass - (.provisioner) -> CSI driver
• PVC - (.spec.storageClassName) -> StorageClass
• POD - (.spec.values[].persistentVolumeClaim) -> PVC

kind: StorageClass
provisioner: csi-driver.example.com

Pod to PVC:

kind: Pod
spec:
  volumes:
    - name: foo
      persistentVolumeClaim:
        claimName: my-request-for-storage