在一臺服務器上來回操作重啟EMQ,在進行集群和退出集群操作，日志報以下錯誤。
EMQ使用rpm命令安裝，一直無法定位到相關問題。

2018-04-27 10:13:02.032 [error] <0.1274.0> Supervisor emqttd_sup had child emqttd_broker started with emqttd_broker:start_link() at <0.1325.0> exit with reason bad argument in call to ets:lookup(mqtt_route, <<"$SYS/brokers/emq@127.0.0.1/uptime">>) in emqttd_router:'-match/1-lc$^0/1-0-'/1 line 94 in context child_terminated
2018-04-27 10:13:02.032 [error] <0.1274.0> Supervisor emqttd_sup had child emqttd_broker started with emqttd_broker:start_link() at <0.1325.0> exit with reason reached_max_restart_intensity in context shutdown
2018-04-27 10:14:10.203 [error] <0.1325.0> gen_server emqttd_broker terminated with reason: bad argument in call to ets:lookup(mqtt_route, <<"$SYS/brokers/emq@127.0.0.1/uptime">>) in emqttd_router:'-match/1-lc$^0/1-0-'/1 line 94
2018-04-27 10:14:10.203 [error] <0.1325.0> CRASH REPORT Process emqttd_broker with 0 neighbours crashed with reason: bad argument in call to ets:lookup(mqtt_route, <<"$SYS/brokers/emq@127.0.0.1/uptime">>) in emqttd_router:'-match/1-lc$^0/1-0-'/1 line 94
2018-04-27 10:14:10.204 [error] <0.1274.0> Supervisor emqttd_sup had child emqttd_broker started with emqttd_broker:start_link() at <0.1325.0> exit with reason bad argument in call to ets:lookup(mqtt_route, <<"$SYS/brokers/emq@127.0.0.1/uptime">>) in emqttd_router:'-match/1-lc$^0/1-0-'/1 line 94 in context child_terminated
2018-04-27 10:14:10.204 [error] <0.1274.0> Supervisor emqttd_sup had child emqttd_broker started with emqttd_broker:start_link() at <0.1325.0> exit with reason reached_max_restart_intensity in context shutdown
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最后卸載已經安裝的EMQ包，例如下:

卸載EMQ
查看安裝包:

[root@home configs]# rpm -qa | grep emqttd
emqttd-2.3-1.el6.x86_64
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卸載安裝包:
rpm -e emqttd-2.3-1.el6.x86_64

安裝指定包:
rpm -ivh emqttd-centos6.8-v2.3-1.el7.centos.x86_64.rpm
更換了好幾個不同版本都一直報同樣的錯誤，只能放棄rpm安裝方式。

通用包安裝
最后使用通用包安裝方法
控制臺調試模式啟動，檢查 EMQ 是否可正常啟動:
/usr/local/emqttd/bin/emqttd console

CTRL+c 關閉控制臺。守護進程模式啟動:
./bin/emqttd start
啟動錯誤日志將輸出在 log/ 目錄。

EMQ消息服務器進程狀態查詢:
./bin/emqttd_ctl status

正常運行狀態，查詢命令返回:

$ ./bin/emqttd_ctl status
Node 'emqttd@127.0.0.1' is started
emqttd 2.0 is running
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停止服務器:
./bin/emqttd stop
有時候不好使用,直接殺死進程比較有效

重復快速關閉重啟服務提示，主要是在與其它EMQ集群之后出現

Protocol 'inet_tcp': register/listen error: eaddrinuse
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原因是端口一直在被占用

sudo netstat -apn | grep ?1883
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kill掉相關進程即可
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總結

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