# PV 使用 Hostpath 方式創建 * 創建以下 sample ``` kind: PersistentVolume apiVersion: v1 metadata: name: hostpath-pv spec: capacity: storage: 1Gi accessModes: - ReadWriteOnce reclaimPolicy: - Recycle hostPath: path: "/tmp/data1" --- apiVersion: v1 kind: PersistentVolumeClaim metadata: name: hostpath-pvc spec: storageClassName: "" accessModes: - ReadWriteOnce resources: requests: storage: 1Gi --- apiVersion: apps/v1 kind: Deployment metadata: name: web-server spec: replicas: 1 selector: matchLabels: app: web-server template: metadata: labels: app: web-server spec: volumes: - name: task-pv-storage persistentVolumeClaim: claimName: hostpath-pvc containers: - name: task-pv-container image: nginx ports: - containerPort: 80 name: "http-server" volumeMounts: - mountPath: "/usr/share/nginx/html" name: task-pv-storage ``` * 檢查 ``` $ kubectl get pv,pvc NAME CAPACITY ACCESS MODES RECLAIM POLICY STATUS CLAIM STORAGECLASS VOLUMEATTRIBUTESCLASS REASON AGE persistentvolume/hostpath-pv 1Gi RWO Retain Bound default/hostpath-pvc <unset> 2m45s NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS VOLUMEATTRIBUTESCLASS AGE persistentvolumeclaim/hostpath-pvc Bound hostpath-pv 1Gi RWO <unset> 2m45s $ kubectl get pod -owide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES web-server-57bb9fdf86-xwgfr 1/1 Running 0 84s 10.42.55.199 rke2-w1 <none> <none> ``` * 透過 hostpath 的方式 pod 就不會像 local 一樣，被限制在同一個節點上。pod 允許飄移，但資料還是只會存在原本的節點上。 ``` $ kubectl exec web-server-57bb9fdf86-xwgfr -- sh -c "echo 123 > /usr/share/nginx/html/index.html" $ curl 10.42.55.199 123 $ kubectl cordon rke2-w1 $ kubectl delete pod web-server-57bb9fdf86-xwgfr # pod 可以漂移了，但是資料並不會跟者同步 $ kubectl get pod -owide NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES web-server-57bb9fdf86-86ljs 1/1 Running 0 11s 10.42.82.105 rke2-w3 <none> <none> $ curl 10.42.82.105 <html> <head><title>403 Forbidden</title></head> <body> <center><h1>403 Forbidden</h1></center> <hr><center>nginx/1.27.4</center> </body> </html> $ kubectl uncordon rke2-w1 ```