我有GKE运行Postgres的实例，并有持续的音量设定来存储数据。但是，我失去数据库中的所有数据，如果我的集群重新启动，如果我删除的Postgres吊舱。如果我运行kubectl delete pod <postgres_pod>删除现有的吊舱和检查kubernetes到位删除吊舱创建的新吊舱，我看不出曾经是在数据库中的数据。

下面是我用来部署的Postgres的YAML文件。

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: custom-storage
parameters:
  type: pd-standard
provisioner: kubernetes.io/gce-pd
reclaimPolicy: Retain
volumeBindingMode: Immediate
---
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: postgres-volume-claim
spec:
  storageClassName: custom-storage
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi

deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: postgres
spec:
  selector:
    matchLabels:
      app: postgres
  template:
    metadata:
      labels:
        app: postgres
    spec:
      containers:
      - name: postgres
        image: postgres:11.5
        resources: {}
        ports:
        - containerPort: 5432
        env:
          - name: POSTGRES_DB
            value: "dbname"
          - name: POSTGRES_USER
            value: "user"
          - name: POSTGRES_PASSWORD
            value: "password"
        volumeMounts:
          - mountPath: /var/lib/postgresql/
            name: postgresdb
      volumes:
        - name: postgresdb
          persistentVolumeClaim:
            claimName: postgres-volume-claim

我仔细检查过了persistentVolumeReclaimPolicy设置为Retain。我在想什么？先感谢您。