k8s-數據卷hostPath卷

1. 數據卷hostPath卷

• hostPath卷：掛載Node節點本地文件系統（Pod所在節點）上文件或者目錄到Pod中的容器。

• 應用場景：Pod中容器需要訪問宿主機文件

• 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：將宿主機/tmp目錄掛載到容器/data目錄

2. 案例

2.1 編寫配置文件

• 創建編寫配置文件目錄

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

• 編寫配置文件

  [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 啟動服務

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

2.3 查看服務是否啟動

[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 驗證數據

我們可以看到節點在node3上面，我們去node3節點/tmp/目錄下載創建一個文件做測試”test.txt“

• 在node3上/tmp/目錄下創建”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
  

• 進入docker容器，驗證是否被引入

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