Kubernetes Rocket-MQ Broker Master

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apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: mq-broker-master-deployment
spec:
  selector:
    matchLabels:
      app: mq-broker-master
  serviceName: mq-broker-master-service
  replicas: 1
  template:
    metadata:
      labels:
        app: mq-broker-master
    spec:
      initContainers:
      - name: init-broker-master
        image: ubuntu:16.04
        command:
        - bash
        - "-c"
        - |
          set -ex
          cp /mnt/config-map/main.properties /mnt/conf/main.properties
        volumeMounts:
        - name: config-map
          mountPath: /mnt/config-map
        - name: conf
          mountPath: /mnt/conf
      ############## Broker Container ###############
      containers:
      - name: mq-broker-master
        image: gcr.io/fintend-cloud/mq-broker:4.2.15
        ports:
          - containerPort: 10911
          - containerPort: 10909
        volumeMounts:
        - name: broker-pvc
          mountPath: /opt/mq
        - name: conf  # relative to init container -> conf volumeMounts
          mountPath: /root/rocketmq/fintend/
      ############# Volumes #############
      volumes:
      - name: config-map
        configMap:
          name: mq-broker-config
      - name: conf
        emptyDir: {}
      nodeSelector:
        node: broker
      tolerations:
        - key: "pod"
          operator: "Equal"
          value: "broker"
          effect: "NoExecute"
  volumeClaimTemplates:
    - metadata:
        name: broker-pvc
      spec:
        accessModes: [ "ReadWriteOnce" ]
        storageClassName: "pd-standard"
        resources:
          requests:
            storage: 200Gi

关键点，init containers如何把初始化好的配置文件传递给boot container

  1. 在volumes，声明一个空的临时目录conf

  2. init container 生成的配置文件存在conf目录里面

  3. boot container 映射conf作为配置文件的路径