k8s中使用nfs创建storageClass

k8s环境配置

服务器 角色 版本
11.0.1.10 master v1.24.0
11.0.1.11 worker v1.24.0
11.0.1.12 worker v1.24.0
11.0.1.13 nfs

安装nfs服务器

11.0.1.13

安装nfs服务

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yum install -y nfs-utils

配置nfs /etc/exports

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/nfs *(rw,sync)

设置目录权限777

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chmod 777 /nfs

重启服务

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systemctl restart nfs

在其他服务器上也要安装nfs-utils

在k8s中安装nfs组件

NFS subdir external provisioner 是一个存储资源自动调配器，它可用将现有的 NFS 服务器通过持久卷声明来支持 Kubernetes 持久卷的动态分配

组件地址：https://github.com/kubernetes-sigs/nfs-subdir-external-provisioner/tree/master/deploy

创建rabc.yaml

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cat > rabc.yaml << EOF
apiVersion: v1
kind: ServiceAccount
metadata:
  name: nfs-client-provisioner
  # replace with namespace where provisioner is deployed
  namespace: default
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: nfs-client-provisioner-runner
rules:
  - apiGroups: [""]
    resources: ["nodes"]
    verbs: ["get", "list", "watch"]
  - 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
    # replace with namespace where provisioner is deployed
    namespace: default
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
  # replace with namespace where provisioner is deployed
  namespace: default
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
  # replace with namespace where provisioner is deployed
  namespace: default
subjects:
  - kind: ServiceAccount
    name: nfs-client-provisioner
    # replace with namespace where provisioner is deployed
    namespace: default
roleRef:
  kind: Role
  name: leader-locking-nfs-client-provisioner
  apiGroup: rbac.authorization.k8s.io
EOF
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kubectl apply -f rabc.yaml

创建deployment-provisioner.yaml

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cat > deployment-provisioner.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nfs-client-provisioner
  labels:
    app: nfs-client-provisioner
  # replace with namespace where provisioner is deployed
  namespace: default
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
          # 镜像地址国内访问不到，需要更换为其他地址
          #image: k8s.gcr.io/sig-storage/nfs-subdir-external-provisioner:v4.0.2
          image: willdockerhub/nfs-subdir-external-provisioner:v4.0.2
          volumeMounts:
            - name: nfs-client-root
              mountPath: /persistentvolumes
          env:
              # provisioner的名字，可以自定义，要和class.yaml中保持一致
            - name: PROVISIONER_NAME
              value: k8s-sigs.io/nfs-subdir-external-provisioner
              # nfs服务器的地址
            - name: NFS_SERVER
              value: 11.0.1.13
              # nfs共享的目录
            - name: NFS_PATH
              value: /nfs
      volumes:
        - name: nfs-client-root
          nfs:
            # nfs服务器的地址
            server: 11.0.1.13
            # nfs共享的目录
            path: /nfs
EOF
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kubectl apply -f deployment-provisioner.yaml

# kubectl get pod 
NAME                                      READY   STATUS    RESTARTS        AGE
nfs-client-provisioner-5bd7d76d8f-nrcgj   1/1     Running   1 (4h48m ago)   20h

创建storageclass.yaml

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cat > storageclass.yaml << EOF
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: nfs-client
# provisioner名称要和deployment里面定义的保持一致
provisioner: k8s-sigs.io/nfs-subdir-external-provisioner 
parameters:
  archiveOnDelete: "false"
EOF
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kubectl apply -f storageclass.yaml

# kubectl get storageclass
NAME          PROVISIONER                                   RECLAIMPOLICY   VOLUMEBINDINGMODE   ALLOWVOLUMEEXPANSION   AGE
nfs-client    k8s-sigs.io/nfs-subdir-external-provisioner   Delete          Immediate           false                  2d2h

测试

创建pvc

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cat > pvc-test.yaml << EOF
kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: test-claim
spec:
  storageClassName: nfs-client
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Mi
EOF

创建pod，挂载pvc

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cat > pod-test.yaml << EOF
kind: Pod
apiVersion: v1
metadata:
  name: test-pod
spec:
  containers:
  - name: test-pod
    image: busybox:stable
    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
EOF