在Kubernetes上搭建RabbitMQ Cluster

为了在Kubernetes上搭建RabbitMQ3.7.X Cluster,踩爆无数坑,官方整合了第三方开源项目但没有完整demo,网上的post都是RabbitMQ 3.6.X旧版的部署方案,几经周折,最终弄明白在Kubernetes集群下,基于Kubernetes Discovery,使用hostname方式部署RabbitMQ3.7.X Cluster,总结如下:

1. IP模式

rabbitmq-peer-discovery-k8s是RabbitMQ官方基于第三方开源项目rabbitmq-autocluster开发,对3.7.X版本提供的Kubernetes下的同行发现插件,但官方只提供了一个基于IP模式的demo

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kind: Service
apiVersion: v1
metadata:
namespace: test-rabbitmq
name: rabbitmq
labels:
app: rabbitmq
type: LoadBalancer
spec:
type: NodePort
ports:
- name: http
protocol: TCP
port: 15672
targetPort: 15672
nodePort: 31672
- name: amqp
protocol: TCP
port: 5672
targetPort: 5672
nodePort: 30672
selector:
app: rabbitmq
---
apiVersion: v1
kind: ConfigMap
metadata:
name: rabbitmq-config
namespace: test-rabbitmq
data:
enabled_plugins: |
[rabbitmq_management,rabbitmq_peer_discovery_k8s].
rabbitmq.conf: |
## Cluster formation. See http://www.rabbitmq.com/cluster-formation.html to learn more.
cluster_formation.peer_discovery_backend = rabbit_peer_discovery_k8s
cluster_formation.k8s.host = kubernetes.default.svc.cluster.local
## Should RabbitMQ node name be computed from the pod's hostname or IP address?
## IP addresses are not stable, so using [stable] hostnames is recommended when possible.
## Set to "hostname" to use pod hostnames.
## When this value is changed, so should the variable used to set the RABBITMQ_NODENAME
## environment variable.
cluster_formation.k8s.address_type = ip
## How often should node cleanup checks run?
cluster_formation.node_cleanup.interval = 30
## Set to false if automatic removal of unknown/absent nodes
## is desired. This can be dangerous, see
## * http://www.rabbitmq.com/cluster-formation.html#node-health-checks-and-cleanup
## * https://groups.google.com/forum/#!msg/rabbitmq-users/wuOfzEywHXo/k8z_HWIkBgAJ
cluster_formation.node_cleanup.only_log_warning = true
cluster_partition_handling = autoheal
## See http://www.rabbitmq.com/ha.html#master-migration-data-locality
queue_master_locator=min-masters
## See http://www.rabbitmq.com/access-control.html#loopback-users
loopback_users.guest = false

---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
name: rabbitmq
namespace: test-rabbitmq
spec:
serviceName: rabbitmq
replicas: 3
template:
metadata:
labels:
app: rabbitmq
spec:
serviceAccountName: rabbitmq
terminationGracePeriodSeconds: 10
containers:
- name: rabbitmq-k8s
image: rabbitmq:3.7
volumeMounts:
- name: config-volume
mountPath: /etc/rabbitmq
ports:
- name: http
protocol: TCP
containerPort: 15672
- name: amqp
protocol: TCP
containerPort: 5672
livenessProbe:
exec:
command: ["rabbitmqctl", "status"]
initialDelaySeconds: 60
periodSeconds: 60
timeoutSeconds: 10
readinessProbe:
exec:
command: ["rabbitmqctl", "status"]
initialDelaySeconds: 20
periodSeconds: 60
timeoutSeconds: 10
imagePullPolicy: Always
env:
- name: MY_POD_IP
valueFrom:
fieldRef:
fieldPath: status.podIP
- name: RABBITMQ_USE_LONGNAME
value: "true"
# See a note on cluster_formation.k8s.address_type in the config file section
- name: RABBITMQ_NODENAME
value: "rabbit@$(MY_POD_IP)"
- name: K8S_SERVICE_NAME
value: "rabbitmq"
- name: RABBITMQ_ERLANG_COOKIE
value: "mycookie"
volumes:
- name: config-volume
configMap:
name: rabbitmq-config
items:
- key: rabbitmq.conf
path: rabbitmq.conf
- key: enabled_plugins
path: enabled_plugins

在ConfigMap配置项中,指明 cluster_formation.k8s.address_type = ip,也就是说RabbitMQ Node的命名和访问地址是以IP地址作为区分,如rabbit@172.0.5.1


RabbitMQ 基础介绍

一、什么是RabbitMQ

RabbitMQ是一个消息代理。

RabbitMQ基于AMQP协议用Erlang编写。

什么是AMQP?

  • AMQP(高级消息队列协议)是一个网络协议。它支持符合要求的客户端应用(application)和消息中间件代理(messaging middleware broker)之间进行通信。