kubernets安装rabbitmq集群.

RabbitMQ集群的两种模式
1）普通模式：默认的集群模式,队列消息只存在单个节点上
2）镜像模式：队列为镜像队列，队列消息存在每个节点上

配置同步：
配置同步：
1.Ha mode 同步模式,以下可选：
1)all 所有的节点都将被同步
2)exactly 指定个数的节点被同步
3)nodes 指定的名称的节点被同步
2.Ha params 上一项中的参数
3.Ha async mode 同步方式，自动或手动

创建rabbitmq集群的yaml文件

下面yaml中涉及的Kubernetes组件有：

1. Service
   1. 提供http服务的service
   2. 提供StatfulSet的headless service
2. StatefulSet
   1. 有状态pods的集合，真正提供rabbitmq的服务

[root@k8smaster centos]# cat rabbitmq.yaml 
---
apiVersion: v1
kind: Service
metadata:
  # Expose the management HTTP port on each node
  name: rabbitmq-management
  labels:
    app: rabbitmq
spec:
  ports:
  - port: 15672
    name: http
  selector:
    app: rabbitmq
  type: NodePort # Or LoadBalancer in production w/ proper security
---
apiVersion: v1
kind: Service
metadata:
  # The required headless service for StatefulSets
  name: rabbitmq
  labels:
    app: rabbitmq
spec:
  ports:
  - port: 5672
    name: amqp
  - port: 4369
    name: epmd
  - port: 25672
    name: rabbitmq-dist
  clusterIP: None
  selector:
    app: rabbitmq
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: rabbitmq
spec:
  serviceName: "rabbitmq"
  replicas: 3
  template:
    metadata:
      labels:
        app: rabbitmq
    spec:
      containers:
      - name: rabbitmq
        image: rabbitmq:3.7-rc-management
        lifecycle:
          postStart:
            exec:
              command:
              - /bin/sh
              - -c
              - >
                if [ -z "$(grep rabbitmq /etc/resolv.conf)" ]; then
                  sed "s/^search ([^ ]+)/search rabbitmq.1 1/" /etc/resolv.conf > /etc/resolv.conf.new;
                  cat /etc/resolv.conf.new > /etc/resolv.conf;
                  rm /etc/resolv.conf.new;
                fi;
                until rabbitmqctl node_health_check; do sleep 1; done;
                if [ -z "$(rabbitmqctl cluster_status | grep rabbitmq-0)" ]; then
                  touch /gotit
                  rabbitmqctl stop_app;
                  rabbitmqctl reset;
                  rabbitmqctl join_cluster rabbit@rabbitmq-0;
                  rabbitmqctl start_app;
                else
                  touch /notget
                fi;
        env:
        - name: MY_POD_NAME
          valueFrom:
            fieldRef:
              fieldPath: metadata.name
        - name: RABBITMQ_ERLANG_COOKIE
          value: "YZSDHWMFSMKEMBDHSGGZ"
        - name: RABBITMQ_NODENAME
          value: "rabbit@$(MY_POD_NAME)"
        ports:
        - containerPort: 5672

通过Pod的postStart来执行命令，把后面的两个Pod加入rabbitmq集群。

Pod的生命周期里有两个个hook部分：PostStart，PreStop

创建不同的rabbitmq集群，需要把yaml文件的很多处rabbitmq关键字替换掉。。。

也可以通过参数来生成yaml文件

kubectl create -f rabbitmq.yam
service "rabbitmq-management" created
service "rabbitmq" created
statefulset "rabbitmq" created

[root@k8smaster centos]# kubectl get pods
NAME                     READY   STATUS    RESTARTS   AGE
nginx-7db9fccd9b-99h6b   1/1     Running   0          2d23h
rabbitmq-0               1/1     Running   0          57m
rabbitmq-1               1/1     Running   0          55m
rabbitmq-2               1/1     Running   0          51m

访问集群

[root@k8smaster centos]# kubectl get svc
NAME                  TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)                       AGE
kubernetes            ClusterIP   10.96.0.1       <none>        443/TCP                       4d
rabbitmq              ClusterIP   None            <none>        5672/TCP,4369/TCP,25672/TCP   105m
rabbitmq-management   NodePort    10.107.192.23   <none>        15672:32201/TCP               105m

可以通过 宿主机主机ip:32219访问
默认用户名guest密码guest

之后补充.

参考:
http://www.yangguanjun.com/2018/08/06/rabbitmq-deploy-with-k8s/
https://segmentfault.com/a/1190000017338025
StatefulSet 基本使用
https://kubernetes.io/zh/docs/tutorials/stateful-application/basic-stateful-set/
RabbitMQ安装与初始配置
https://www.cnblogs.com/chrischennx/p/7071471.html