DevOps: What are PersistentVolume and PersistentVolumeClaim?

1# PersistentVolume
2apiVersion: v1
3kind: PersistentVolume
4metadata:
5  name: my-pv
6spec:
7  capacity:
8    storage: 10Gi
9  accessModes:
10    - ReadWriteOnce
11  persistentVolumeReclaimPolicy: Retain
12  storageClassName: standard
13  hostPath:
14    path: /mnt/data
15
16# PersistentVolumeClaim
17apiVersion: v1
18kind: PersistentVolumeClaim
19metadata:
20  name: my-pvc
21spec:
22  accessModes:
23    - ReadWriteOnce
24  resources:
25    requests:
26      storage: 5Gi
27  storageClassName: standard

1# Usage in Pod
2spec:
3  containers:
4  - name: app
5    volumeMounts:
6    - name: data
7      mountPath: /data
8  volumes:
9  - name: data
10    persistentVolumeClaim:
11      claimName: my-pvc