What is Kubernetes PersistentVolume and PersistentVolumeClaim?

Question

Accepted Answer

**PV** — cluster-level storage resource. **PVC** — request for storage by a Pod.

```yaml
# PersistentVolume
apiVersion: v1
kind: PersistentVolume
metadata:
  name: my-pv
spec:
  capacity:
    storage: 10Gi
  accessModes:
  - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  storageClassName: standard
  hostPath:
    path: /data/pv
---
# PersistentVolumeClaim
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: my-pvc
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi
  storageClassName: standard
```

**Access modes:**
- RWO: ReadWriteOnce (one node).
- ROX: ReadOnlyMany (multiple nodes).
- RWX: ReadWriteMany (multiple nodes).

DevOps: What is Kubernetes PersistentVolume and PersistentVolumeClaim?