nagios监控mysql主从复制

下手处：登陆mysql从服务器，通过执行 mysql> show slave status\G 查看其输出，即可判定主从复制是否正常。下面是监控MYSQL复制某个从服务器的输出：
mysql> show slave status\G
*************************** 1. row ***************************
               Slave_IO_State: Waiting for master to send event
                  Master_Host: 192.168.93.16
                  Master_User: rep1
                  Master_Port: 3306
                Connect_Retry: 60
              Master_Log_File: mysql-bin.000004
          Read_Master_Log_Pos: 1752541
               Relay_Log_File: hy-mysql3-relay-bin.000088
                Relay_Log_Pos: 2339
        Relay_Master_Log_File: mysql-bin.000004
             Slave_IO_Running: Yes
            Slave_SQL_Running: Yes
              Replicate_Do_DB:
这个输出，最关键处就是”Slave_IO_Running: Yes“和“Slave_SQL_Running: Yes”，这两个值全是”Yes”就表明主从复制正常，否则就是有问题。
操作步骤：
1、在主数据库服务器增加一个用户，给予较低的权限，操作为 mysql > grant Replication client on *.* to  ‘nagios’@'%’ identified by