[系统运维]k8s 创建pvpvcstorageClass

一 安装nfs网络文件系统

# 安装nfs
	yum install -y nfs-utils
	# 创建nfs目录
	mkdir -p /nfs/data/
	mkdir -p /nfs/data/mysql
	# 授予权限
	chmod -R 777 /nfs/data
	# 编辑export文件
	vi /etc/exports
	  /nfs/data *(rw,no_root_squash,sync)
	# 使得配置生效
	exportfs -r
	# 查看生效
	exportfs
	# 启动rpcbind、nfs服务
	systemctl restart rpcbind && systemctl enable rpcbind
	systemctl restart nfs && systemctl enable nfs
	# 查看rpc服务的注册情况
	rpcinfo -p localhost
	# showmount测试
	showmount -e master-ip

02 所有node上安装客户端
	yum -y install nfs-utils
	systemctl start nfs && systemctl enable nfs

二 手动创建pv,pvc

yaml声明pv

# 定义PV
apiVersion: v1
kind: PersistentVolume
metadata:
  name: nginx-pv
spec:
  accessModes:
    - ReadWriteMany
  capacity:
    storage: 1Gi
  nfs:
    path: /nfs/data/nginx
    server: 192.168.43.100

yaml声明pvc

# 定义PVC，用于消费PV
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: nginx-pvc
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 1Gi

pod挂载pvc

# 定义Pod，指定需要使用的PVC
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - image: nginx
        name: mysql
        ports:
        - containerPort: 80
        volumeMounts:
        - name: nginx-persistent-storage
          mountPath: /usr/share/nginx/html
      volumes:
      - name: nginx-persistent-storage
        persistentVolumeClaim:
          claimName: nginx-pvc

三 storageClass方式创建pvc,pv

• 如上面的方式创建pv一个2个还比较简单，但如果成百上千就会造成我们维护起来十分麻烦

• 有没有一种方式我们只关心pvc，系统通过pvc自动为我们创建pv呢

• storangeClass就提供了这样的功能

下载k8s nfs依赖插件

下载地址：https://github.com/kubernetes-retired/external-storage/tree/master/nfs

注意k8s版本不一样，对应的语法不太一样一下支持v1.16至v1.20的版本

rbac.yaml是创建一个用户让appserver通过认证

apiVersion: v1
kind: ServiceAccount
metadata:
  name: nfs-provisioner
---
kind: ClusterRole
apiVersion: rbac.authorization.k8s.io/v1
metadata:
   name: nfs-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: ["watch", "create", "update", "patch"]
   -  apiGroups: [""]
      resources: ["services", "endpoints"]
      verbs: ["get","create","list", "watch","update"]
   -  apiGroups: ["extensions"]
      resources: ["podsecuritypolicies"]
      resourceNames: ["nfs-provisioner"]
      verbs: ["use"]
---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  name: run-nfs-provisioner
subjects:
  - kind: ServiceAccount
    name: nfs-provisioner
    namespace: default
roleRef:
  kind: ClusterRole
  name: nfs-provisioner-runner
  apiGroup: rbac.authorization.k8s.io

修改deployment.yaml

kind: Deployment
apiVersion: apps/v1
metadata:
   name: nfs-client-provisioner
spec:
   replicas: 1
   strategy:
     type: Recreate
   selector:
     matchLabels:
        app: nfs-client-provisioner
   template:
      metadata:
         labels:
            app: nfs-client-provisioner
      spec:
         serviceAccount: nfs-provisioner
         containers:
            -  name: nfs-client-provisioner
               image: registry.baidubce.com/quay.io/external_storage/nfs-client-provisioner:v3.1.0-k8s1.11
               volumeMounts:
                 -  name: nfs-client-root
                    mountPath:  /persistentvolumes
               env:
                 -  name: PROVISIONER_NAME #供应者的名字
                    value: storage/nfs #名字虽然可以随便起，以后引用要一致
                 -  name: NFS_SERVER
                    value: 192.168.43.100
                 -  name: NFS_PATH
                    value: /nfs/data/wl
         volumes:
           - name: nfs-client-root
             nfs:
               server: 192.168.43.100
               path: /nfs/data/wl

创建storageClass

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: nfs-storage
  annotations:
    storageclass.kubernetes.io/is-default-class: "true"
provisioner: storage/nfs
reclaimPolicy: Delete
allowVolumeExpansion: True  #允许pvc创建后扩容

创建pvc

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: my-pvc
spec:
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 10Gi
  # 这个名字要和上面创建的storageclass名称一致
  storageClassName: nfs-storage

创建pod挂载pvc

apiVersion: v1
kind: Service
metadata:
  name: mysql
spec:
  type: NodePort
  ports:
  - port: 3306
    nodePort: 30306
    protocol: TCP
    targetPort: 3306
  selector:
    app: mysql

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - image: mysql:5.7
        name: mysql
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: "123456"
        ports:
        - containerPort: 3306
          name: mysql
        volumeMounts:
        - name: mysql-persistent-storage
          mountPath: /var/lib/mysql
      volumes:
      - name: mysql-persistent-storage
        persistentVolumeClaim:
          claimName: my-pvc

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