emqtt安装
下载程序: wget http://emqtt.com/static/brokers/emqttd-centos6.8-v2.1.2.zip
解压文件：unzip emqttd-centos6.8-v2.1.2.zip
控制台调试模式启动，检查emqttd是否可正常启动:cd emqttd && ./bin/emqttd console,
输出如下：
Exec: /home/rbtest/jww/emqttd/erts-8.1/bin/erlexec -boot /home/rbtest/jww/emqttd/releases/2.1.2/emqttd -mode embedded -boot_var ERTS_LIB_DIR /home/rbtest/jww/emqttd/erts-8.1/../lib -mnesia dir "/home/rbtest/jww/emqttd/data/mnesia/emqttd@127.0.0.1" -config /home/rbtest/jww/emqttd/data/configs/app.2017.08.29.14.44.54.config -args_file /home/rbtest/jww/emqttd/data/configs/vm.2017.08.29.14.44.54.args -vm_args /home/rbtest/jww/emqttd/data/configs/vm.2017.08.29.14.44.54.args -- console
Root: /home/rbtest/jww/emqttd
/home/rbtest/jww/emqttd
Erlang/OTP 19 [erts-8.1] [source-77fb4f8] [64-bit] [smp:10:10] [async-threads:32] [hipe] [kernel-poll:true]
starting emqttd on node 'emqttd@127.0.0.1'
emqttd ctl is starting...[ok]
emqttd hook is starting...[ok]
emqttd router is starting...[ok]
emqttd pubsub is starting...[ok]
emqttd stats is starting...[ok]
emqttd metrics is starting...[ok]
emqttd pooler is starting...[ok]
emqttd trace is starting...[ok]
emqttd client manager is starting...[ok]
emqttd session manager is starting...[ok]
emqttd session supervisor is starting...[ok]
emqttd wsclient supervisor is starting...[ok]
emqttd broker is starting...[ok]
emqttd alarm is starting...[ok]
emqttd mod supervisor is starting...[ok]
emqttd bridge supervisor is starting...[ok]
emqttd access control is starting...[ok]
emqttd system monitor is starting...[ok]
Load emq_mod_presence module successfully.
Load emq_mod_subscription module successfully.
dashboard:http listen on 0.0.0.0:18083 with 2 acceptors.
mqtt:tcp listen on 0.0.0.0:1883 with 8 acceptors.
mqtt:ssl listen on 0.0.0.0:8883 with 4 acceptors.
mqtt:ws listen on 0.0.0.0:8083 with 4 acceptors.
mqtt:wss listen on 0.0.0.0:8084 with 4 acceptors.
emqttd 2.1.2 is running now
Eshell V8.1 (abort with ^G)
启动
守护进程模式启动:./bin/emqttd start,日志输出在log/emqttd_sasl.log文件
状态监视
emqttd消息服务器进程状态查询:./bin/emqttd_ctl status
[rbtest@bogon emqttd]$ ./bin/emqttd_ctl status
Node 'emqttd@127.0.0.1' is started
emqttd 2.1.2 is running
emqttd消息服务器提供了状态监控URL:http://localhost:8083/status
停止服务器
停止命令: ./bin/emqttd stop
TCP端口占用
默认端口
| 端口 | 用途 |
|---|---|
| 1883 | MQTT协议端口 |
| 8883 | MQTT(SSL)端口 |
| 8083 | MQTT(WebSocket), HTTP API端口 |
| 18083 | Dashboard管理控制台端口 |
emqtt上述端口配置，可通过文件etc/emq.conf配置文件的listeners段落设置。
## TCP Listener: 1883, 127.0.0.1:1883, ::1:1883
mqtt.listener.tcp = 1883
## SSL Listener: 8883, 127.0.0.1:8883, ::1:8883
mqtt.listener.ssl = 8883
## HTTP and WebSocket Listener
mqtt.listener.http = 8083
配置文件
| 名称 | 作用 |
|---|---|
| etc/emq.conf | EMQ消息服务器参数设置 |
| etc/plugins/*.conf | EMQ插件配置文件 |
重要的配置
etc/emq.conf配置文件的’Listeners`段落设置最大允许连接数:
listener.tcp.external = 0.0.0.0:1883
listener.tcp.external.acceptors = 8
listener.tcp.external.max_clients = 1024
emq.conf有两个属性的配置
| 名称 | 作用 |
|---|---|
| node.process_limit | Erlang虚拟机允许的最大进程数，emqttd一个连接会消耗2个Erlang进程 |
| node.max_ports | Erlang虚拟机允许的最大Port数量，emqttd一个连接消耗1个Port |
Erlang的Port非TCP端口，可以理解为文件句柄。
node.process_limit = 参数值 > 最大允许连接数 * 2
node.max_ports = 参数值 > 最大允许连接数
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