除錯

1. dashboard 登入畫面沒有 domain 可選，無法登入，檢查 memcached 服務啟動失敗。
   

   [root@controller ~]# systemctl status memcached.service 
   ● memcached.service - memcached daemon
      Loaded: loaded (/usr/lib/systemd/system/memcached.service; enabled; vendor preset: disabled)
      Active: failed (Result: exit-code) since Tue 2018-09-18 19:34:49 CST; 5s ago
     Process: 177450 ExecStart=/usr/bin/memcached -p ${PORT} -u ${USER} -m ${CACHESIZE} 
   -c ${MAXCONN} $OPTIONS (code=exited, status=71)
    Main PID: 177450 (code=exited, status=71)
   
   Sep 18 19:34:49 controller systemd[1]: Started memcached daemon.
   Sep 18 19:34:49 controller systemd[1]: Starting memcached daemon...
   Sep 18 19:34:49 controller memcached[177450]: bind(): Cannot assign requested address
   Sep 18 19:34:49 controller memcached[177450]: failed to listen on TCP port 11211: 
   Cannot assign requested address
   Sep 18 19:34:49 controller systemd[1]: memcached.service: main process exited, 
   code=exited, status=71/n/a
   Sep 18 19:34:49 controller systemd[1]: Unit memcached.service entered failed state.
   Sep 18 19:34:49 controller systemd[1]: memcached.service failed.
   

2. /usr/bin/memcached 執行命令的參數在 /etc/sysconfig/memcached

   [root@controller ~]# cat /etc/sysconfig/memcached 
   PORT="11211"
   USER="memcached"
   MAXCONN="1024"
   CACHESIZE="64"
   OPTIONS="-l 163.17.10.112,::1"
   

3. 問題出在 /etc/sysconfig/memcached 中 OPTIONS 參數不對，修改如下：

   [root@controller ~]# grep OPTION /etc/sysconfig/memcached 
   OPTIONS="-l 163.17.10.112"
   

4. 重新啟動 memcached 服務，狀態正常。

   [root@controller ~]# systemctl restart memcached.service 
   [root@controller ~]# systemctl status memcached.service 
   ● memcached.service - memcached daemon
      Loaded: loaded (/usr/lib/systemd/system/memcached.service; enabled; vendor preset: disabled)
      Active: active (running) since Tue 2018-09-18 19:40:44 CST; 4s ago
    Main PID: 178062 (memcached)
       Tasks: 10
      CGroup: /system.slice/memcached.service
              └─178062 /usr/bin/memcached -p 11211 -u memcached -m 64 -c 1024 -l 163.17.10.112
   
   Sep 18 19:40:44 controller systemd[1]: Started memcached daemon.
   Sep 18 19:40:44 controller systemd[1]: Starting memcached daemon...