報錯資訊：

1 [root@server1 bin]# masterha_check_repl --conf=/etc/masterha_default.cnf
2 
3 Wed Aug 30 05:04:48 2017 - [error][/usr/local/share/perl5/MHA/ServerManager.pm, ln492]  Server 192.168.100.10(192.168.100.10:3306) is dead, but must be alive! Check server settings.
4 Wed Aug 30 05:04:48 2017 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln424] Error happened on checking configurations.  at /usr/local/share/perl5/MHA/MasterMonitor.pm line 399
 

5 Wed Aug 30 05:04:48 2017 - [error][/usr/local/share/perl5/MHA/MasterMonitor.pm, ln523] Error happened on monitoring servers.

解決方法：

1 登入192.168.100.10的MySQL。發現MySQL服務是正常，可是為什麼會說 192.168.100.10：3306 IS DEAD,可能是防火牆等原因。
2 
3 [root@server1 ~]# service iptables stop
4 iptables: Setting chains to policy ACCEPT: filter          [  OK  ]
 
5 iptables: Flushing firewall rules:                         [  OK  ]
6 iptables: Unloading modules:                               [  OK  ]
7 關閉防火牆之後，一切正常了。