如何重用现有的持久卷声明

Question

我已经删除了我的 elasticsearch 集群，但现在在我部署了一个新集群之后，我需要访问存储在 3 个 Persistent Volumes PV 上的旧数据，如下所述：

NAME                       STATUS    VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS   AGE
storage-es-data-0          Bound     pvc-19429b0b-ba42-11e7-979d-42010a840ff7   12Gi       RWO            standard       10d
storage-es-data-1          Bound     pvc-36505962-ba42-11e7-979d-42010a840ff7   12Gi       RWO            standard       10d
storage-es-data-2          Bound     pvc-422da328-ba42-11e7-979d-42010a840ff7   12Gi       RWO            standard       10d

这是旧 PV 声明的描述：

NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS    CLAIM                              STORAGECLASS   REASON    AGE
pvc-19429b0b-ba42-11e7-979d-42010a840ff7   12Gi       RWO            Delete           Bound     default/storage-es-data-0          standard                 10d
pvc-36505962-ba42-11e7-979d-42010a840ff7   12Gi       RWO            Delete           Bound     default/storage-es-data-1          standard                 10d
pvc-422da328-ba42-11e7-979d-42010a840ff7   12Gi       RWO            Delete           Bound     default/storage-es-data-2          standard                 10d

我的新部署描述如下：

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: es-data
  labels:
    component: elasticsearch
    role: data
spec:
  replicas: 1
  template:
    metadata:
      labels:
        component: elasticsearch
        role: data
    spec:
      initContainers:
      - name: init-sysctl
        image: busybox
        imagePullPolicy: IfNotPresent
        command: ["sysctl", "-w", "vm.max_map_count=262144"]
        securityContext:
          privileged: true
      containers:
      - name: es-data
        image: docker.elastic.co/elasticsearch/elasticsearch:5.6.3
        imagePullPolicy: Always
        ports:
        - containerPort: 9300
          name: transport
          protocol: TCP
        volumeMounts:
        - name: storage
          mountPath: /data
      volumes:
      - name: storage
        persistentVolumeClaim:
          claimName: storage-es-data-0

将我的 pod 与 Loadblance 服务连接后，我没有找到任何文档。我错过了什么吗？以及如何在同一个 POD 中使用三个 PV。

Answer 1

您的deployment yaml 文件是正确的。您应该能够在您的 pod 中的 /data 文件夹内的 pvc-19429b0b-ba42-11e7-979d-42010a840ff7 卷中找到文件。

要在同一个 POD 中使用三个 PV，只需将它们添加到您的 deployment yaml：

apiVersion: apps/v1beta1
kind: Deployment
metadata:
  name: es-data
  labels:
    component: elasticsearch
    role: data
spec:
  replicas: 1
  template:
    metadata:
      labels:
        component: elasticsearch
        role: data
    spec:
      initContainers:
      - name: init-sysctl
        image: busybox
        imagePullPolicy: IfNotPresent
        command: ["sysctl", "-w", "vm.max_map_count=262144"]
        securityContext:
          privileged: true
      containers:
      - name: es-data
        image: docker.elastic.co/elasticsearch/elasticsearch:5.6.3
        imagePullPolicy: Always
        ports:
        - containerPort: 9300
          name: transport
          protocol: TCP
        volumeMounts:
        - name: storage-0
          mountPath: /data0
        - name: storage-1
          mountPath: /data1
        - name: storage-2
          mountPath: /data2
      volumes:
      - name: storage-0
        persistentVolumeClaim:
          claimName: storage-es-data-0
      - name: storage-1
        persistentVolumeClaim:
          claimName: storage-es-data-1
      - name: storage-2
        persistentVolumeClaim:
          claimName: storage-es-data-2