K8s系列---【安装nfs文件系统（为k8s提供动态创建pv的能力）】

安装nfs文件系统（为k8s提供动态创建pv的能力）

1.1 安装nfs-server

# 在每个机器执行下面这条命令(包含master)。
yum install -y nfs-utils      

下面的​

​/nfs/data​

​目录可以自定义，这个是用来供node节点往master节点同步pv数据用的目录

# 在master 执行以下命令，直接粘贴执行，或者粘贴到shell脚本中执行
echo "/nfs/data/ *(insecure,rw,sync,no_root_squash)" > /etc/exports


# 在master执行以下命令，启动 nfs 服务;创建共享目录
mkdir -p /nfs/data


# 在master执行
systemctl enable rpcbind
systemctl enable nfs-server
systemctl start rpcbind
systemctl start nfs-server

# 使配置生效
exportfs -r


#检查配置是否生效
exportfs      

验证：执行完命令之后，出现​

​/nfs/data <world>​

​,则说明执行成功。

1.2 配置nfs-client（选做）

主要用来把node节点的​

​/nfs/data​

​的数据同步到master节点，下面命令直接复制所有并在所有node节点执行。

#在所有node节点执行，下面的ip改成你自己的master的ip
  showmount -e 192.168.26.180
  
  mkdir -p /nfs/data
  
  #在所有node节点执行，下面的ip改成你自己的master的ip
  mount -t nfs 192.168.26.180:/nfs/data /nfs/data      

1.3 配置动态创建pv默认存储

把下面的两处ip更换成自己的nfs的server服务的ip，这里我已把master作为nfs的server服务，所以更换成master的ip即可。

在nfs服务器上创建sc.yml文件：​

​vi sc.yaml​

​

把下面的代码粘贴到sc.yaml文件中

在master执行​

​kubectl get sc​

​​和​

​kubectl get storageclass​

​,此时查看都是没有的,No resource found。

在master执行：​

​kubectl apply -f sc.yaml​

​

## 创建了一个存储类
apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: nfs-storage
  annotations:
    storageclass.kubernetes.io/is-default-class: "true"
provisioner: k8s-sigs.io/nfs-subdir-external-provisioner
parameters:
  archiveOnDelete: "true"  ## 删除pv的时候，pv的内容是否要备份

  ---
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
          image: registry.cn-hangzhou.aliyuncs.com/lfy_k8s_images/nfs-subdir-external-provisioner:v4.0.2
          # resources:
          #    limits:
          #      cpu: 10m
          #    requests:
          #      cpu: 10m
          volumeMounts:
            - name: nfs-client-root
              mountPath: /persistentvolumes
          env:
            - name: PROVISIONER_NAME
              value: k8s-sigs.io/nfs-subdir-external-provisioner
            - name: NFS_SERVER
              value: 192.168.26.180 ## 指定自己nfs服务器地址,这里我把master设置成server服务器了
            - name: NFS_PATH
              value: /nfs/data  ## nfs服务器共享的目录
      volumes:
        - name: nfs-client-root
          nfs:
            server: 192.168.26.180 ## 指定自己nfs服务器地址,这里我把master设置成server服务器了
            path: /nfs/data
  ---
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      

1.4 验证

• 执行：​

  ​kubectl get pod -A​

  ​ ,查看nfs-client-provisioner-322342c323是否Running。
• pvc的创建与绑定

kind: PersistentVolumeClaim
  apiVersion: v1
  metadata:
    name:nginx-pvc
  spec:
    accessModes:
      - ReadWriteMany
    resources:
      requests:
        storage: 200Mi
    # 使用kubectl get sc 查看默认存储类的name，一般为nfs-storage，也可以不指定，自动会挂载到默认存储类上
    sotrageClassName: nfs-storage      

vi pvc.yaml

kubectl apply -f pvc.yaml

  #pvc处于绑定状态
kubectl get pvc

  #这时会发现，已经自动创建了pv 
kubectl get pv