Mongo 持久性在重启后不会在 K8S 集群上保留数据

Question

我使用 Kubeadm 和两个 Ubuntu 虚拟服务器创建了自己的 k8s 集群 - 一个主节点和一个工作节点。我还部署了一个带有 MongoDB 持久性的 Springboot 应用程序，它工作得非常好。以下是我的 k8s 集群中的节点

下面是我的 yaml 文件的内容，该文件创建存储类、持久卷、持久卷声明、mongo 部署和 mongo 服务

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
   name: local-storage
provisioner: kubernetes.io/no-provisioner
volumeBindingMode: WaitForFirstConsumer
allowVolumeExpansion: true
reclaimPolicy: Retain
---
apiVersion: v1
kind: PersistentVolume
metadata:
  name: mongo-pv
spec:
  capacity:
    storage: 5Gi
  volumeMode: Filesystem
  accessModes:
  - ReadWriteMany
  persistentVolumeReclaimPolicy: Retain
  storageClassName: local-storage
  hostPath:
    path: "/home/moviepopcorn/mongodb/data"
  nodeAffinity:
    required:
      nodeSelectorTerms:
      - matchExpressions:
        - key: kubernetes.io/hostname
          operator: In
          values: 
          - node1
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mongo-pvc
spec:
  volumeName: mongo-pv
  volumeMode: Filesystem
  storageClassName: local-storage
  accessModes:
    - ReadWriteMany
  resources:
    requests:
      storage: 5Gi
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mongo
  labels:
    app: mongo
spec:
   selector:
      matchLabels:
         app: mongo
   template:
      metadata:
         labels:
            app: mongo
      spec:
        containers:
        - name: mongo
          image: mongo:4.4.11
          ports:
          - containerPort: 27017 
          volumeMounts:
          - name: mongo-persistent-storage
            mountPath: /home/moviepopcorn/mongodb/data
        volumes:
          - name: mongo-persistent-storage
            persistentVolumeClaim:
              claimName: mongo-pvc
---
apiVersion: v1
kind: Service
metadata:
  name: mongo-service
spec:
  selector:
    app: mongo
  ports:
    - protocol: TCP 
      port: 27017
      targetPort: 27017

一旦我重新启动 k8s 集群中的节点，从 Springboot 存储到 mongodb 的数据就不会保留。你能帮我理解我犯了什么错误吗？

Answer 1

可能您已经更新了 PVC 挂载路径，并且由于 mongo 不知道在哪里存储或保存数据，

apiVersion: apps/v1
kind: Deployment
metadata:
  creationTimestamp: null
  labels:
    app: mongo
  name: mongo
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mongo
  strategy: {}
  template:
    metadata:
      creationTimestamp: null
      labels:
        app: mongo
    spec:
      containers:
      - image: mongo
        name: mongo
        args: ["--dbpath","/data/db"]
        livenessProbe:
          exec:
            command:
              - mongo
              - --disableImplicitSessions
              - --eval
              - "db.adminCommand('ping')"
          initialDelaySeconds: 30
          periodSeconds: 10
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 6
        readinessProbe:
          exec:
            command:
              - mongo
              - --disableImplicitSessions
              - --eval
              - "db.adminCommand('ping')"
          initialDelaySeconds: 30
          periodSeconds: 10
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 6
        env:
        - name: MONGO_INITDB_ROOT_USERNAME
          valueFrom:
            secretKeyRef:
              name: mongo-creds
              key: username
        - name: MONGO_INITDB_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mongo-creds
              key: password
        volumeMounts:
        - name: "mongo-data-dir"
          mountPath: "/data/db"
      volumes:
      - name: "mongo-data-dir"
        persistentVolumeClaim:
          claimName: "pvc"

请尝试上面的示例或检查 arg 和 挂载路径供参考。