k8s-数据卷hostPath卷

1. 数据卷hostPath卷

• hostPath卷：挂载Node节点本地文件系统（Pod所在节点）上文件或者目录到Pod中的容器。

• 应用场景：Pod中容器需要访问宿主机文件

• 示例:

  apiVersion: v1
  kind: Pod
  metadata:
    name: my-hostpath
  spec:
    containers: 
    - name: busybox
      image: busybox
      args:
      - /bin/sh
      - -c
      - sleep 36000
      volumeMounts:
      - name: data
        mountPath: /data
    volumes:
    - name: data
      hostPath:
        path: /tmp
        type: Directory
  

  ​ 示例：将宿主机/tmp目录挂载到容器/data目录

2. 案例

2.1 编写配置文件

• 创建编写配置文件目录

  [root@k8s-master yaml]# mkdir -p hostPath/
  [root@k8s-master yaml]# cd hostPath/
  [root@k8s-master hostPath]# ll
  总用量 0
  

• 编写配置文件

  [root@k8s-master hostPath]# vim hostpath.yaml
  [root@k8s-master hostPath]# cat hostpath.yaml
  apiVersion: v1
  kind: Pod
  metadata:
    name: my-hostpath
  spec:
    containers: 
    - name: busybox
      image: busybox
      args:
      - /bin/sh
      - -c
      - sleep 36000
      volumeMounts:
      - name: data
        mountPath: /data
    volumes:
    - name: data
      hostPath:
        path: /tmp
        type: Directory
  

2.2 启动服务

[root@k8s-master hostPath]# kubectl apply -f hostpath.yaml 
pod/my-hostpath created

2.3 查看服务是否启动

[root@k8s-master hostPath]# kubectl get pods -o wide
NAME                 READY   STATUS    RESTARTS   AGE     IP               NODE        NOMINATED NODE   READINESS GATES
configmap-demo-pod   1/1     Running   0          2d      10.244.107.209   k8s-node3   <none>           <none>
my-hostpath          1/1     Running   0          4m28s   10.244.107.211   k8s-node3   <none>           <none>
secret-demo-pod      1/1     Running   0          41h     10.244.107.210   k8s-node3   <none>           <none>

2.4 验证数据

我们可以看到节点在node3上面，我们去node3节点/tmp/目录下载创建一个文件做测试”test.txt“

• 在node3上/tmp/目录下创建”test.txt“文件

  [root@k8s-node3 ~]# cd /tmp/
  [root@k8s-node3 tmp]# ls
  [root@k8s-node3 tmp]# touch test.txt
  [root@k8s-node3 tmp]# ls
  test.txt
  

• 进入docker容器，验证是否被引入

  [root@k8s-master hostPath]# kubectl exec -it my-hostpath -- /bin/sh 
  / # ls  /data/
  test.txt