apiVersion: v1
kind: Namespace
metadata:
  name: dev

---

# 按顺序定义 pv，pvc，pod

apiVersion: v1
kind: PersistentVolume
metadata:
  name: pv-hostpath
  namespace: dev # pv允许被跨namespace使用
spec:
  capacity:
    storage: 1Ti # 此卷容量，单位支持 Ti T Gi G Mi M Ki K，可以改小，但强烈不建议
  accessModes:
    - ReadWriteMany # 允许多个客户端读写，还有ReadWriteOnce（允许单个节点读写），ReadOnlyMany（允许多个节点只读）,单个节点可以包含多个Pod
  persistentVolumeReclaimPolicy: Retain # 删除pvc时，pv的回收策略，这里为保留。还有 Delete（删除）
  storageClassName: node-local # 存储分类定义，会被pvc引用
  hostPath: # 可换为 nfs 等其他存储
    path: /home/host-pv-dir

---

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: pvc-hostpath
spec:
  accessModes:
    - ReadWriteMany # 必须和PV一致才能匹配
  storageClassName: node-local # 存储分类定义，对应pv定义
  resources:
    requests:
      storage: 500Mi # pvc一旦创建，若要修改申请的空间大小，只能增加不能减少!

---

apiVersion: v1
kind: Pod
metadata:
  name: busybox-use-pvc
  labels:
    app: busybox
spec:
  containers:
    - name: write
      image: busybox
      command: [ "sh", "-c" ]
      args: [ "echo 'hellok8s, pvc used!' > /write_dir/data; sleep infinity" ]
      volumeMounts:
        - mountPath: /write_dir
          name: pvc-dir
  volumes:
    - name: pvc-dir
      persistentVolumeClaim:
        claimName: pvc-hostpath # 对应pvc名称