架构

架构：四台服务器，三台搭建 k8s 集群，一台做 nfs 服务器

• 17：集群 master
• 18：集群 node01
• 19：集群 node02
• 28：nfs服务器

搭建集群时，如果选择20或以上版本，pvc 会一直pengding，describe 查看报错

waiting for a volume to be created, either by external provisioner “fuseim.pri/ifs” or manually created by system administrator

logs 查看报错

unexpected error getting claim reference: selfLink was empty, can’t make reference

经查阅资料，1.20版本默认删除了SelfLink的功能，导致无法绑定pv和pvc，所以本文选用19版本
搭建 k8s 集群，请参考 使用 rancher 部署 k8s 集群

 

安装 nfs 服务端

在 28 服务器上操作
 
安装nfs和rpc服务组件

yum install -y nfs-utils rpcbind

关闭防火墙

systemctl stop firewalld && systemctl disable firewalld

配置NFS服务的配置文件

vim /etc/exports

/home/nfs *(rw,no_root_squash,sync)

配置是否生效

exportfs -r
exportfs 

启动服务

systemctl restart rpcbind && systemctl enable rpcbind
systemctl restart nfs && systemctl enable nfs

检查是否启动了rpcbind服务并监听着 111端口

lsof -i :111

安装 nfs 客户端

在 17、18、19 服务器上执行

安装nfs 客户端

yum -y install nfs-utils
systemctl start nfs && systemctl enable nfs

用showmount搜索网络中可用的共享文件

showmount -e 192.168.140.28

挂载

mount -t nfs 192.168.140.28:/home/nfs /mnt

查看是否已挂载

df -h

可以转场了
因为测试发现 storageclass 不会自动根据 pvc 创建 pv
如需自动创建，请参考 k8s 部署 NFS Provisioner

创建 storageclass

使用 nfs-client-provisioner 实现

kubectl apply -f nfs-client-provisioner.yaml

内容

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                 # 根据自己的名称来修改
            - name: NFS_SERVER
              value: 192.168.140.28        # NFS服务器所在的 ip
            - name: NFS_PATH
              value: /home/nfs                  # 共享存储目录
      volumes:
        - name: nfs-client-root
          nfs:
            server: 192.168.140.28         # NFS服务器所在的 ip
            path: /home/nfs                     # 共享存储目录

创建 rbac

 kubectl apply -f rbac.yaml

内容

apiVersion: v1
kind: ServiceAccount
metadata:
  name: nfs-client-provisioner
  # replace with namespace where provisioner is deployed
  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
    # replace with namespace where provisioner is deployed
    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
  # replace with namespace where provisioner is deployed
  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
  # replace with namespace where provisioner is deployed
  namespace: kube-system
subjects:
  - kind: ServiceAccount
    name: nfs-client-provisioner
    # replace with namespace where provisioner is deployed
    namespace: kube-system
roleRef:
  kind: Role
  name: leader-locking-nfs-client-provisioner
  apiGroup: rbac.authorization.k8s.io

创建 storageclass

kubectl apply -f storageclass.yaml

内容

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: nfs
# 和 deployment 自定义 value 一致
provisioner: mynfs  

创建 pvc

创建 nginx 的 pvc

kubectl apply -f nginx-pvc.yaml

内容

---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nginx-pv
spec:
  accessModes:
    - ReadWriteMany
  # 指定刚才创建的 storage-class 的 metadata.name
  storageClassName: "nfs"
  resources:
    requests:
      storage: 2Gi

查看 pvc 是否创建成功，成功状态是 Bound

kubectl get pvc

在 28 服务器上可以看到，pv创建成功

创建 pod 来使用 pvc

 kubectl apply -f test-busybox.yaml

内容

kind: Pod
apiVersion: v1
metadata:
  name: test-busybox
spec:
  containers:
  - name: test-busybox
    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:
      # 和 pvc 的 metadata.name 一致
        claimName: nginx-pv

执行成功后，在 28 服务器的 pvc 上可以看到 SUCCESS