What is a PersistentVolume?

A PersistentVolume (PV) is a piece of storage in the cluster: a cloud disk (EBS, Persistent Disk), an NFS share, a local disk. It lives independently of pods; even if the pod is deleted, the data remains. PVs are cluster-scoped and are created either by hand by an administrator or automatically with a StorageClass.

apiVersion: v1
kind: PersistentVolume
metadata:
  name: nfs-pv
spec:
  capacity:
    storage: 50Gi
  accessModes: [ReadWriteMany]
  persistentVolumeReclaimPolicy: Retain
  nfs:
    server: 10.0.0.20
    path: /disa/paylasim

persistentVolumeReclaimPolicy determines what happens when the claim using the PV is deleted:

• Retain: the PV and data stay; an administrator cleans up by hand. The safe choice for important data.
• Delete: the underlying disk is deleted too. Often the default for dynamically created PVs.

$ kubectl get pv
NAME       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM
nfs-pv     50Gi       RWX            Retain           Available
pvc-3f2a…  10Gi       RWO            Delete           Bound       default/data-db-0