Emqtt集群搭建

1 Emqtt简单搭建

1.1  介绍：EMQ：EMQ 2.0，号称百万级开源MQTT消息服务器，基于Erlang/OTP语言平台开发，支持大规模连接和分布式集群，发布订阅模式的开源MQTT消息服务器。

EMQ 默认开启的 MQTT 服务 TCP 端口:

1883	MQTT 协议端口
8883	MQTT/SSL 端口
8083	MQTT/WebSocket 端口
8084	MQTT/WebSocket/SSL 端口

防火墙根据使用的 MQTT 接入方式，开启上述端口的访问权限。

EMQ 节点集群使用的 TCP 端口:

4369	集群节点发现端口
6369	集群节点控制通道

集群节点间如有防护墙，需开启上述 TCP 端口互访权限

1.2   集群创建方式

NGINX Plus -> EMQ 集群

NGINX Plus 产品作为 EMQ 集群 LB，并终结 SSL 连接:

1. 注册 NGINX Plus 试用版，Ubuntu 下安装: https://cs.nginx.com/repo_setup
2. 创建 EMQ 节点集群，例如:

节点	IP 地址
emq1	192.168.0.2
emq2	192.168.0.3

3. 配置 /etc/nginx/nginx.conf，示例:

   stream {
       # Example configuration for TCP load balancing
   
       upstream stream_backend {
           zone tcp_servers 64k;
           hash $remote_addr;
           server 192.168.0.2:1883 max_fails=2 fail_timeout=30s;
           server 192.168.0.3:1883 max_fails=2 fail_timeout=30s;
       }
   
       server {
           listen 8883 ssl;
           status_zone tcp_server;
           proxy_pass stream_backend;
           proxy_buffer_size 4k;
           ssl_handshake_timeout 15s;
           ssl_certificate     /etc/emqttd/certs/cert.pem;
           ssl_certificate_key /etc/emqttd/certs/key.pem;
       }
   }

1.3  搭建EMQTT单机版

通用包下载地址：

CentOS7

http://emqtt.com/downloads/latest/centos7

[root@emq-node1 opt]# ll
total 20020
-rw-r--r-- 1 root root 20497451 Aug 23  2018 emqttd-centos7-v2.3.11.zip
[root@emq-node1 opt]# unzip emqttd-centos7-v2.3.11.zip  &>/dev/null
[root@emq-node1 opt]# cd emqttd/
#启动EMQTT
[root@emq-node1 emqttd]# ./bin/emqttd start
emqttd 2.3.11 is started successfully!
#查看EMQTT集群状态
[root@emq-node1 emqttd]# ./bin/emqttd_ctl status
Node 'emq@127.0.0.1' is started
emqttd 2.3.11 is running
#WEB的URL状态监控
[root@emq-node1 emqttd]# curl http://localhost:8080/status
Node emq@127.0.0.1 is started
emqttd is running

1.4 单机变器群　　

#emqttd-node1先关闭服务
[root@emq-node1 emqttd]# ./bin/emqttd stop
#原配置文件
[root@emq-node1 emqttd]# egrep '127.0.0.1' etc/emq.conf|egrep -v '#'
node.name = emq@127.0.0.1
listener.tcp.internal = 127.0.0.1:11883
#更改配置文件
[root@emq-node2 emqttd]# hostname -I
10.0.0.101 
[root@emq-node1 emqttd]# sed -i 's#127.0.0.1#10.0.0.101#g' etc/emq.conf 
[root@emq-node1 emqttd]# egrep '10.0.0.101' etc/emq.conf|egrep -v '#'
node.name = emq@10.0.0.101
listener.tcp.internal = 10.0.0.101:11883
#在启动服务
[root@emq-node1 emqttd]# ./bin/emqttd start
emqttd 2.3.11 is started successfully!
#emqttd-nod2重复操作
[root@emq-node2 emqttd]# ./bin/emqttd stop
ok
[root@emq-node2 emqttd]# hostname -I
10.0.0.102 
[root@emq-node2 emqttd]# sed -i 's#127.0.0.1#10.0.0.102#g' etc/emq.conf 
[root@emq-node2 emqttd]# ./bin/emqttd start
emqttd 2.3.11 is started successfully!
#手动加入集群
[root@emq-node2 emqttd]# ./bin/emqttd_ctl cluster join emq@10.0.0.101
Join the cluster successfully.
Cluster status: [{running_nodes,['emq@10.0.0.101','emq@10.0.0.102']}]
[root@emq-node2 emqttd]# ./bin/emqttd_ctl cluster status
Cluster status: [{running_nodes,['emq@10.0.0.101','emq@10.0.0.102']}]
#重节点中删除
[root@emq-node2 emqttd]# ./bin/emqttd_ctl cluster leave
Leave the cluster successfully.
Cluster status: [{running_nodes,['emq@10.0.0.102']}]
#配置文件中指定集群节点，两台机器操作一致先关闭EMQTT
[root@emq-node1 emqttd]# egrep -n "cluster.static.seeds|cluster.discovery" etc/emq.conf 
23: cluster.discovery = static   #默认是manual手动创建集群，集群节点
49:cluster.static.seeds = emq@10.0.0.101,emq@10.0.0.102

1.5 Web管理界面　　

#默认账号密码admin public

扩展插件以及优化详见官方文档：http://emqtt.com/docs/v2/index.html