rbac.yaml

apiVersion: v1
kind: ServiceAccount
metadata:
  name: nfs-client-provisioner
  namespace: kube-system
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: nfs-client-provisioner-runner
rules:
  - apiGroups: [""]
    resources: ["persistentvolumes"]
    verbs: ["get", "list", "watch", "create", "delete"]
  - apiGroups: [""]
    resources: ["persistentvolumeclaims"]
    verbs: ["get", "list", "watch", "update"]
  - apiGroups: ["storage.k8s.io"]
    resources: ["storageclasses"]
    verbs: ["get", "list", "watch"]
  - apiGroups: [""]
    resources: ["events"]
    verbs: ["create", "update", "patch"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: run-nfs-client-provisioner
subjects:
  - kind: ServiceAccount
    name: nfs-client-provisioner
    namespace: kube-system
roleRef:
  kind: ClusterRole
  name: nfs-client-provisioner-runner
  apiGroup: rbac.authorization.k8s.io
---
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: leader-locking-nfs-client-provisioner
  namespace: kube-system
rules:
  - apiGroups: [""]
    resources: ["endpoints"]
    verbs: ["get", "list", "watch", "create", "update", "patch"]
---
kind: RoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: leader-locking-nfs-client-provisioner
  namespace: kube-system
subjects:
  - kind: ServiceAccount
    name: nfs-client-provisioner
    namespace: kube-system
roleRef:
  kind: Role
  name: leader-locking-nfs-client-provisioner
  apiGroup: rbac.authorization.k8s.io

nfs-client-provisioner.yaml

kind: Deployment
apiVersion: apps/v1
metadata:
  name: nfs-client-provisioner
  namespace: kube-system
spec:
  replicas: 1
  strategy:
    type: Recreate
  selector:
    matchLabels:
      app: nfs-client-provisioner
  template:
    metadata:
      labels:
        app: nfs-client-provisioner
    spec:
      serviceAccountName: nfs-client-provisioner
      containers:
        - name: nfs-client-provisioner
          image: quay.io/external_storage/nfs-client-provisioner:latest
          volumeMounts:
            - name: nfs-client-root
              mountPath: /persistentvolumes
          env:
            - name: PROVISIONER_NAME
              value: mynfs
            - name: NFS_SERVER
              value: 10.6.9.16
            - name: NFS_PATH
              value: /home/nfs_share
      volumes:
        - name: nfs-client-root
          nfs:
            server: 10.6.9.16
            path: /home/nfs_share

nfs-storageclass.yaml

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: nfs
provisioner: mynfs

设置为默认存储

k8s: pod has unbound PersistentVolumeClaims问题解决

PVC和PV的绑定是通过StorageClassName进行的。然而如果定义PVC时没有指定StorageClassName呢？这取决与admission插件是否开启了DefaultDefaultStorageClass功能：

如果DefaultDefaultStorageClass功能开启，那么此PVC的StorageClassName就会被指定为DefaultStorageClass。DefaultStorageClass从何处而来呢？原来在定义StorageClass时，可以在Annotation中添加一个键值对：storageclass.kubernetes.io/is-default-class: true，那么此StorageClass就变成默认的StorageClass了。
如果DefaultDefaultStorageClass功能没有开启，那么没有指定StorageClassName的PVC只能被绑定到同样没有指定StorageClassName的PV。

apiVersion: storage.k8s.io/v1
kind: StorageClass
  metadata: 
     storageclass.beta.kubernetes.io/is-default-class: "true"
     storageclass.kubernetes.io/is-default-class: "true"
  name: nfs
provisioner: mynfs

测试效果

vim test-pods.yaml

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: test-claim
  annotations:
    volume.beta.kubernetes.io/storage-class: "nfs" # 与 storageclass.yaml 中的 name 一致
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Mi

---

kind: Pod
apiVersion: v1
metadata:
  name: test-pod
spec:
  containers:
  - name: test-pod
    image: busybox:1.24
    command:
      - "/bin/sh"
    args:
      - "-c"
      - "touch /mnt/SUCCESS && exit 0 || exit 1"
    volumeMounts:
      - name: nfs-pvc
        mountPath: "/mnt"
  restartPolicy: "Never"
  volumes:
    - name: nfs-pvc
      persistentVolumeClaim:
        claimName: test-claim

[root@rds005-master-1 nfs]# kubectl get sc
NAME   PROVISIONER   RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
nfs    mynfs         Delete          Immediate           false                  18m

[root@rds005-master-1 nfs]# kubectl get pvc
NAME         STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
test-claim   Bound    pvc-b19c46c0-245f-429e-81d3-162430e5464c   1Mi        RWX            nfs            12m

[root@rds005-master-1 nfs]# ls /home/nfs_share/default-test-claim-pvc-b19c46c0-245f-429e-81d3-162430e5464c/SUCCESS
/home/nfs_share/default-test-claim-pvc-b19c46c0-245f-429e-81d3-162430e5464c/SUCCESS