Kubernetes 动态PV使用

Kubernetes支持动态供给的存储插件：
https://kubernetes.io/docs/concepts/storage/storage-classes/

Dynamic Provisioning机制工作的核心在于StorageClass的API对象。
StorageClass声明存储插件，用于自动创建PV。

Kubernetes 动态PV使用-LMLPHP

创建动态PVStorageClass

1、创建storageclass相关文件
1.1、vim storageclass-nfs.yaml：标识插件创建storageclass名称

apiVersion: storage.k8s.io/v1beta1

kind: StorageClass

metadata:

  # StorageClass名称

  name: managed-nfs-storage

# 默认不支持nfs存储，添加支持web插件标识

provisioner: fuseim.pri/ifs

1.2、vim deployment-nfs.yaml：创建nfs相关存储指定服务名称

apiVersion: apps/v1beta1

kind: Deployment

metadata:

  name: nfs-client-provisioner

spec:

  replicas: 1

  strategy:

    type: Recreate

  template:

    metadata:

      labels:

        app: nfs-client-provisioner

    spec:

      imagePullSecrets:

        - name: registry-pull-secret

      # 绑定角色定义的名称

      serviceAccount: nfs-client-provisioner

      containers:

        # 镜像拉取

        - name: nfs-client-provisioner

          image: lizhenliang/nfs-client-provisioner:v2.0.0

          # 自定义变量格式处理

          volumeMounts:

            - name: nfs-client-root

              mountPath: /persistentvolumes

          env:

            - name: PROVISIONER_NAME

              # 指定标识插件的值

              value: fuseim.pri/ifs

            - name: NFS_SERVER

              # nfs地址

              value: 192.168.1.115

            - name: NFS_PATH

              # 挂在路径

              value: /data/nfs

      volumes:

        - name: nfs-client-root

          nfs:

            # nfs地址

            server: 192.168.1.115

            # 共享路径

            path: /data/nfs

1.3、vim rbac.yaml：创建rbac授权apiserver

apiVersion: v1

kind: ServiceAccount

metadata:

  name: nfs-client-provisioner

---

kind: ClusterRole

apiVersion: rbac.authorization.k8s.io/v1beta1

metadata:

  name: nfs-client-provisioner-runner

# 角色中可以访问的权限

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: ["list", "watch", "create", "update", "patch"]

---

# 角色绑定

kind: ClusterRoleBinding

apiVersion: rbac.authorization.k8s.io/v1beta1

metadata:

  name: run-nfs-client-provisioner

subjects:

  # 绑定角色 ServiceAccount

  - kind: ServiceAccount

    name: nfs-client-provisioner

    namespace: default

roleRef:

  kind: ClusterRole

  name: nfs-client-provisioner-runner

  apiGroup: rbac.authorization.k8s.io

2、创建文件

kubectl apply -f storageclass-nfs.yaml

kubectl apply -f rbac.yaml

kubectl apply -f deployment-nfs.yaml

3、查看创建的storageclass
kubectl get storageclass

NAME PROVISIONER AGE

managed-nfs-storage fuseim.pri/ifs 57s

4、查看创建的nfs容器
kubectl get pods

NAME READY STATUS RESTARTS AGE

nfs-client-provisioner-565b4456f6-v9b97 1/1 Running 0 67s

使用动态 PV StorageClass 案例一

环境：部署mysql
1、创建yaml配置文件。vim mysql.yaml

apiVersion: v1

kind: Service

metadata:

  name: mysql

spec:

  ports:

  - port: 3306

    name: mysql

  # 创建service为无头服务，标识容器

  clusterIP: None

  selector:

    app: mysql-public

---

apiVersion: apps/v1beta1

kind: StatefulSet

# 名称

metadata:

  name: db

spec:

  # 指定service名称

  serviceName: "mysql"

  # 标签选择器

  template:

    metadata:

      labels:

        app: mysql-public

    spec:

      # 镜像容器编辑

      containers:

      - name: mysql

        image: mysql:5.7

        env:

        # 创建数据库用户密码

        - name: MYSQL_ROOT_PASSWORD

          value: ""

        # 创建数据库

        - name: MYSQL_DATABASE

          value: test

        # 启用端口

        ports:

        - containerPort: 3306

        # 数据卷

        volumeMounts:

        # 挂在容器目录

        - mountPath: "/var/lib/mysql"

          # 使用来源

          name: mysql-data

      # 使用数据卷来源

      volumes:

      # 数据卷名称

      - name: mysql-data

        # 指定数据卷动态供给

        persistentVolumeClaim:

          # pvc动态供给名称

          claimName: mysql-pvc

---

apiVersion: v1

kind: PersistentVolumeClaim

metadata:

  # pvc名称

  name: mysql-pvc

spec:

  # 读写权限

  accessModes:

    - ReadWriteMany

  # 使用的存储类

  storageClassName: managed-nfs-storage

  # 定义容量

  resources:

    requests:

      storage: 5Gi

2、创建容器

kubectl apply -f mysql.yaml

3、查看持久卷
kubectl get PersistentVolumeClaim

NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE

mysql-public-mysql-public-0 Bound default-mysql-public-mysql-public-0-pvc-2b4979b7-c89a-11e9-8b0e-000c29400317 2Gi RWO managed-nfs-storage 39m

mysql-pvc Bound default-mysql-pvc-pvc-b8584af2-c89d-11e9-9db0-000c292e28d6 5Gi RWX managed-nfs-storage 14m

使用动态 PV StorageClass 案例二

1、创建文件
vim sts.yaml

apiVersion: v1

kind: Service

metadata:

  name: nginx

  labels:

    app: nginx

spec:

  ports:

  - port: 80

    name: web

  clusterIP: None

  selector:

    app: nginx

---

apiVersion: apps/v1beta1

kind: StatefulSet

metadata:

  name: nginx-statefulset

  namespace: default

spec:

  serviceName: nginx

  replicas: 3

  selector:

    matchLabels:

      app: nginx

  template:

    metadata:

      labels:

        app: nginx

    spec:

      containers:

      - name: nginx

        image: nginx:latest

        ports:

        - containerPort: 80

          name: web

        volumeMounts:

        - name: www

          mountPath: /usr/share/nginx/html

  volumeClaimTemplates:

  - metadata:

      name: www

    spec:

      accessModes: [ "ReadWriteOnce" ]

      storageClassName: "managed-nfs-storage"

      resources:

        requests:

          storage: 1Gi

2、创建容器

kubectl create -f sts.yaml

3、查看pod
kubectl get pods

NAME READY STATUS RESTARTS AGE

nginx-statefulset-0 1/1 Running 0 3m21s

nginx-statefulset-1 1/1 Running 0 3m16s

nginx-statefulset-2 1/1 Running 0 3m11s

4、查看动态pv，pvc存储kubectl get pv,pvc
kubectl get pv,pvc

NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS REASON AGE

persistentvolume/default-mysql-public-mysql-public-0-pvc-2b4979b7-c89a-11e9-8b0e-000c29400317 2Gi RWO Delete Bound default/mysql-public-mysql-public-0 managed-nfs-storage 63m

persistentvolume/default-www-nginx-statefulset-0-pvc-8063e4f9-c8a1-11e9-8b0e-000c29400317 1Gi RWO Delete Bound default/www-nginx-statefulset-0       managed-nfs-storage 11m

persistentvolume/default-www-nginx-statefulset-1-pvc-836c1466-c8a1-11e9-8b0e-000c29400317 1Gi RWO Delete Bound default/www-nginx-statefulset-1 managed-nfs-storage 11m

persistentvolume/default-www-nginx-statefulset-2-pvc-868a4a51-c8a1-11e9-8b0e-000c29400317 1Gi RWO Delete Bound default/www-nginx-statefulset-2 managed-nfs-storage 11m

persistentvolume/my-pv 5Gi RWX Retain Bound default/my-pvc 133m

NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE

persistentvolumeclaim/my-pvc Bound my-pv 5Gi RWX 133m

persistentvolumeclaim/mysql-public-mysql-public-0 Bound default-mysql-public-mysql-public-0-pvc-2b4979b7-c89a-11e9-8b0e-000c29400317 2Gi RWO managed-nfs-storage 63m

persistentvolumeclaim/www-nginx-statefulset-0 Bound default-www-nginx-statefulset-0-pvc-8063e4f9-c8a1-11e9-8b0e-000c29400317 1Gi RWO managed-nfs-storage 11m

persistentvolumeclaim/www-nginx-statefulset-1 Bound default-www-nginx-statefulset-1-pvc-836c1466-c8a1-11e9-8b0e-000c29400317 1Gi RWO managed-nfs-storage 11m

persistentvolumeclaim/www-nginx-statefulset-2 Bound default-www-nginx-statefulset-2-pvc-868a4a51-c8a1-11e9-8b0e-000c29400317 1Gi RWO managed-nfs-storage 11m

5、nfs服务器会自动创建pv数据
[root@localhost nfs]# ls

default-www-nginx-statefulset-0-pvc-8063e4f9-c8a1-11e9-8b0e-000c29400317

default-www-nginx-statefulset-1-pvc-836c1466-c8a1-11e9-8b0e-000c29400317

default-www-nginx-statefulset-2-pvc-868a4a51-c8a1-11e9-8b0e-000c29400317