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你好 Kubernetes 冠军，我们最近转移到卷的“保留”模式。一切正常，不幸的是操作系统崩溃了。重新启动后，除了使用 PVC 和 PV 的 Pod 之外，所有 Pod 都可以成功运行。我检查了PV，它们似乎很好

pvc-df5b3877-762e-4ce1-b45f-7f98cba4a4ab 1Gi RWO Retain Bound default/pvc-svcmaps example-nfs 21d

PVC看起来也不错

pvc-svcmaps Bound pvc-df5b3877-762e-4ce1-b45f-7f98cba4a4ab 1Gi RWO example-nfs 21d

但是吊舱卡住了，没有重新启动 svcmaps-949f87f58-jg5wz 0/1 Init:Unknown 0 6h48m

以下是我运行 cmd 时 pod 内的错误（k describe po svcmaps-949f87f58-jg5wz）

  Type     Reason       Age                      From           Message
  ----     ------       ----                     ----           -------
  Warning  FailedMount  3m24s (x194 over 6h39m)  kubelet, site  Unable to mount volumes for pod "svcmaps-949f87f58-jg5wz_default(cf9ebf48-43cc-4f21-bcd6-480732c5fa43)": timeout expired waiting for volumes to attach or mount for pod "default"/"svcmaps-949f87f58-jg5wz". list of unmounted volumes=[svcmaps-storage]. list of unattached volumes=[svcmaps-storage default-token-ppqgg]````

当我们使用 "reclaimPolicy: Retain" 时，有什么我们应该遗漏的吗？

下面是我们使用的存储yaml

kind: ServiceAccount
metadata:
  name: nfs-provisioner
---
kind: Service
apiVersion: v1
metadata:
  name: nfs-provisioner
  labels:
    app: nfs-provisioner
spec:
  ports:
    - name: nfs
      port: 2049
    - name: mountd
      port: 20048
    - name: rpcbind
      port: 111
    - name: rpcbind-udp
      port: 111
      protocol: UDP
  selector:
    app: nfs-provisioner
---
kind: Deployment
apiVersion: apps/v1
metadata:
  name: nfs-provisioner
spec:
  selector:
    matchLabels:
      app: nfs-provisioner
  replicas: 1
  strategy:
    type: Recreate 
  template:
    metadata:
      labels:
        app: nfs-provisioner
    spec:
      serviceAccount: nfs-provisioner
      containers:
        - name: nfs-provisioner
          image: quay.io/kubernetes_incubator/nfs-provisioner:v2.2.2
          ports:
            - name: nfs
              containerPort: 2049
            - name: mountd
              containerPort: 20048
            - name: rpcbind
              containerPort: 111
            - name: rpcbind-udp
              containerPort: 111
              protocol: UDP
          securityContext:
            capabilities:
              add:
                - DAC_READ_SEARCH
                - SYS_RESOURCE
          args:
            - "-provisioner=example.com/nfs"
          env:
            - name: POD_IP
              valueFrom:
                fieldRef:
                  fieldPath: status.podIP
            - name: SERVICE_NAME
              value: nfs-provisioner
            - name: POD_NAMESPACE
              valueFrom:
                fieldRef:
                  fieldPath: metadata.namespace
          imagePullPolicy: "IfNotPresent"
          volumeMounts:
            - name: export-volume
              mountPath: /export
      volumes:
        - name: export-volume
          hostPath:
            path: /srv
---
kind: StorageClass
apiVersion: storage.k8s.io/v1
metadata:
  annotations:
    storageclass.beta.kubernetes.io/is-default-class: "true"
  name: example-nfs
reclaimPolicy: Retain
provisioner: example.com/nfs
mountOptions:
  - vers=4.1
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  creationTimestamp: null
  name: cluster-admin-0
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: nfs-provisioner
  namespace: default
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