阿里云Kubernetes CSI实践 - 静态云盘卷

环境准备

集群创建、依赖配置、CSI插件部署等请参考：CSI部署详解

创建云盘

需要创建按量付费云盘：参考文档

创建静态PV、PVC

通过云盘控制台创建云盘后，记录其DiskId：d-bp1fqy1enb2rtymx5g5y；

通过下面模板创建静态卷PV、PVC:

apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: disk-pvc
spec:
  accessModes:
  - ReadWriteOnce
  resources:
    requests:
      storage: 25Gi
  selector:
    matchLabels:
      alicloud-pvname: static-disk-pv
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: disk-pv
  labels:
    alicloud-pvname: static-disk-pv
spec:
  capacity:
    storage: 25Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Retain
  csi:
    driver: diskplugin.csi.alibabacloud.com
    volumeHandle: d-bp1fqy1enb2rtymx5g5y

驱动类型为：diskplugin.csi.alibabacloud.com，表示使用阿里云云盘CSI插件；

volumeHandle：定义云盘ID；

# kubectl get pvc
NAME       STATUS   VOLUME    CAPACITY   ACCESS MODES   STORAGECLASS   AGE
disk-pvc   Bound    disk-pv   25Gi       RWO                           8m15s

# kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS     CLAIM              STORAGECLASS        REASON   AGE
disk-pv                                    25Gi       RWO            Retain           Bound      default/disk-pvc                                8m16s

创建应用

apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx-disk
  labels:
    app: nginx
spec:
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx:1.7.9
        ports:
        - containerPort: 80
        volumeMounts:
          - name: disk-pvc
            mountPath: "/data"
      volumes:
        - name: disk-pvc
          persistentVolumeClaim:
            claimName: disk-pvc

验证挂载、高可用

查看pod，验证云盘挂载成功，创建测试文件；
# kubectl get pod
NAME                          READY   STATUS    RESTARTS   AGE
nginx-disk-6d5659d745-f8ds6   1/1     Running   0          12m

# kubectl exec nginx-disk-6d5659d745-f8ds6 ls /data
lost+found

# kubectl exec nginx-disk-6d5659d745-f8ds6 mount | grep /data
/dev/vdb on /data type ext4 (rw,relatime,data=ordered)

# kubectl exec nginx-disk-6d5659d745-f8ds6 touch /data/test
# kubectl exec nginx-disk-6d5659d745-f8ds6 ls /data
lost+found
test

删除Pod，查看重建Pod是否数据稳定；
# kubectl delete pod nginx-disk-6d5659d745-f8ds6
pod "nginx-disk-6d5659d745-f8ds6" deleted

# kubectl get pod
NAME                          READY   STATUS    RESTARTS   AGE
nginx-disk-6d5659d745-55fcj   1/1     Running   0          53s
# kubectl exec nginx-disk-6d5659d745-55fcj ls /data
lost+found
test