利用nfs+PersistentVolume 完成mysql集群

1. 完成nfs服务的搭建：

见我的简书nfs的安装与使用 记录

2. 建立PersistentVolume

• 文件：mysql-pv.yml

apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-pv
spec:
  accessModes:
  - ReadWriteOnce
  capacity:
    storage: 1Gi
  persistentVolumeReclaimPolicy: Retain
  storageClassName: nfs
  nfs:
   path: /nfsdata/mysql-pv
   server: 172.26.195.120

• 创建并查看：

root@ali005:~/mysql-volume# kubectl create -f mysql-pv.yml 
persistentvolume/mysql-pv created
root@ali005:~/mysql-volume# kubectl get pv
NAME       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS      CLAIM   STORAGECLASS   REASON   AGE
mysql-pv   1Gi        RWO            Retain           Available           nfs                     12s

注意：此时status是Avaliable状态

2. 建立PersistentVolumeClaim

• 文件：mysql-pvc.yml

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 1Gi
  storageClassName: nfs

• 创建并查看

root@ali005:~/mysql-volume# kubectl get pvc
NAME        STATUS   VOLUME     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
mysql-pvc   Bound    mysql-pv   1Gi        RWO            nfs            8s
root@ali005:~/mysql-volume# kubectl get pv
NAME       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM               STORAGECLASS   REASON   AGE
mysql-pv   1Gi        RWO            Retain           Bound    default/mysql-pvc   nfs                     3m46s

注意：此时pv的state是：Bound，同时CLAIM选项成为default/mysql-pvc

3. 建立service和deployment

• 文件：mysql.yml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql
spec:
  selector:
    matchLabels:
      app: mysql
  replicas: 3
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers: 
      - image: mysql:5.6
        name: mysql
        env:
        - name: MYSQL_ROOT_PASSWORD
          value: abc
        ports:
        - containerPort: 3306
          name: mysql
        volumeMounts:
        - name: mysql-persistent-storage
          mountPath: /var/lib/mysql
      volumes:
      - name: mysql-persistent-storage
        persistentVolumeClaim:
          claimName: mysql-pvc
---
apiVersion: v1
kind: Service
metadata:
  name: mysql
spec:
  ports:
  - port: 3306
  selector:
    app: mysql

• 创建并查看

root@ali005:~/mysql-volume# kubectl create -f mysql.yml 
deployment.apps/mysql created
service/mysql created
root@ali005:~/mysql-volume# kubectl get pod
NAME                    READY   STATUS    RESTARTS   AGE
mysql-bd4895546-5c897   1/1     Running   1          54s
mysql-bd4895546-r8jgs   1/1     Running   1          54s
mysql-bd4895546-wrmwk   1/1     Running   2          54s