kubernetes rabbitmq 集群安装配置

生成secret来保存relang-cookie：

secret.yml文件：

apiVersion: v1
kind: Secret
metadata:
  name: rabbit-cookie
type: Opaque
data:
  cookie: UERVU0hWVU9KT1ZQVUVYT0JXWU8=

生成statefulset：

rabbit-cluster.yml

---
apiVersion: v1
kind: Service
metadata:
  name: rabbitmq-management
  labels:
    app: rabbitmq
spec:
  ports:
  - port: 15672
    name: http
    nodePort: 32001
  - port: 5672
    name: amqp
    nodePort: 32002
  selector:
    app: rabbitmq
  type: NodePort
---
apiVersion: v1
kind: Service
metadata:
  name: rabbitmq
  labels:
    app: rabbitmq
spec:
  clusterIP: None
  ports:
  - port: 5672
    name: amqp
  selector:
    app: rabbitmq
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: rabbitmq
spec:
  serviceName: rabbitmq
  replicas: 3
  template:
    metadata:
      labels:
        app: rabbitmq
    spec:
      serviceAccountName: rabbitmq
      imagePullSecrets:
        - name: regsecret
      containers:
      - name: rabbitmq
        image: 192.168.78.4/rabbit/rabbitmq:3.6.11
        imagePullPolicy: IfNotPresent
        resources:
          requests:
            memory: "256Mi"
            cpu: "150m"
          limits:
            memory: "512Mi"
            cpu: "250m"
        ports:
        - containerPort: 5672
          name: amqp
        env:
          - name: RABBITMQ_DEFAULT_USER
            value: rabbituser
          - name: RABBITMQ_DEFAULT_PASS
            value: rabbitmq
          - name: RABBITMQ_ERLANG_COOKIE
            valueFrom:
              secretKeyRef:
                name: rabbit-cookie
                key: cookie
          - name: MY_POD_NAME
            valueFrom:
              fieldRef:
                fieldPath: metadata.name
          - name: K8S_SERVICE_NAME
            value: "rabbitmq"
          - name: RABBITMQ_USE_LONGNAME
            value: "true"
          - name: RABBITMQ_NODENAME
            value: "rabbit@$(MY_POD_NAME).$(K8S_SERVICE_NAME)"
          - name: RABBITMQ_NODE_TYPE
            value: disc
          - name: AUTOCLUSTER_TYPE
            value: "k8s"
          - name: AUTOCLUSTER_DELAY
            value: ""
          - name: AUTOCLUSTER_CLEANUP
            value: "true"
          - name: CLEANUP_WARN_ONLY
            value: "false"
          - name: K8S_ADDRESS_TYPE
            value: "hostname"
          - name: K8S_HOSTNAME_SUFFIX
            value: ".$(K8S_SERVICE_NAME)"
        volumeMounts:
        - name: rabbitmq-volume
          mountPath: /var/lib/rabbitmq
  volumeClaimTemplates:
  - metadata:
      name: rabbitmq-volume
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 5Gi

这里有个很重要的知识：

每个pod的hostname之间可以相互解析，

If there exists a headless service in the same namespace as the pod and with the same name as the subdomain, the cluster’s KubeDNS Server also returns an A record for the Pod’s fully qualified hostname。

具体看：https://kubernetes.io/docs/concepts/services-networking/dns-pod-service/