1 个 pod 在 Minikube 上具有未绑定的即时 PersistentVolumeClaims

Question

我正在尝试将 kubernetes 与 Spring Boot 应用程序一起使用并使用 mysql。但是我在 minikube 仪表板上发现了这个错误：

0/1 nodes are available: 1 pod has unbound immediate PersistentVolumeClaims.Back-off restarting failed container    

为boath 用户和管理员创建了一个秘密文件，一个configMap 文件也用于将spring boot 映像映射到mysql 的服务。Mysql部署文件是：

apiVersion: v1
kind: Service
metadata:
  name: mysql  # DNS name
  labels:
    app: mysql
    tier: database
spec:
  ports:
    - port: 3306
      targetPort: 3306
  selector:       # mysql Pod Should contain same labels
    app: mysql
    tier: database
  clusterIP: None  # We Use DNS, Thus ClusterIP is not relevant
---
# Define a 'Persistent Volume Claim'(PVC) for Mysql Storage, dynamically provisioned by cluster
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pv-claim # name of PVC essential for identifying the storage data
  labels:
    app: mysql
    tier: database
spec:
  accessModes:
    - ReadWriteOnce   #This specifies the mode of the claim that we are trying to create.
  resources:
    requests:
      storage: 1Gi    #This will tell kubernetes about the amount of space we are trying to claim.
---
# Configure 'Deployment' of mysql server
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql
  labels:
    app: mysql
    tier: database
spec:
  selector: # mysql Pod Should contain same labels
    matchLabels:
      app: mysql
      tier: database
  strategy:
    type: Recreate
  template:
    metadata:
      labels: # Must match 'Service' and 'Deployment' selectors
        app: mysql
        tier: database
    spec:
      containers:
        - image: mysql:latest # image from docker-hub
          args:
            - "--ignore-db-dir=lost+found" # Workaround for https://github.com/docker-library/mysql/issues/186
          name: mysql
          env:
            - name: MYSQL_ROOT_PASSWORD # Setting Root Password of mysql From a 'Secret'
              valueFrom:
                secretKeyRef:
                  name: db-admin # Name of the 'Secret'
                  key: password   # 'key' inside the Secret which contains required 'value'
            - name: MYSQL_USER # Setting USER username on mysql From a 'Secret'
              valueFrom:
                secretKeyRef:
                  name: db-user
                  key: username
            - name: MYSQL_PASSWORD # Setting USER Password on mysql From a 'Secret'
              valueFrom:
                secretKeyRef:
                  name: db-user
                  key: password
            - name: MYSQL_DATABASE # Setting Database Name from a 'ConfigMap'
              valueFrom:
                configMapKeyRef:
                  name: db-config
                  key: name
          ports:
            - containerPort: 3306
              name: mysql
          volumeMounts:        # Mounting volume obtained from Persistent Volume Claim
            - name: mysql-persistent-storage
              mountPath: /var/lib/mysql #This is the path in the container on which the mounting will take place.
      volumes:
        - name: mysql-persistent-storage # Obtaining 'volume' from PVC
          persistentVolumeClaim:
            claimName: mysql-pv-claim

我是 kubernetes 的新手，我找不到解决方案。

Answer 1

您需要创建一个 PV 来满足 PVC。如果您应用以下 PV，它应该可以工作。

apiVersion: v1
kind: PersistentVolume
metadata:
  name: task-pv-volume
  labels:
    type: local
spec:
  capacity:
    storage: 1Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: "/mnt/data"

请注意以下几点

1. 的使用hostPath在生产中不推荐
2. capacity PV和PVC的需要匹配
3. accessModes PV和PVC的需要匹配