zabbix可能监控到mysql服务的运行情况,但确不能监控mysql的主从复制是否正常:有时候,同步已经停止,但管理人员却不知道。登陆
起因:zabbix可能监控到mysql服务的运行情况,但确不能监控mysql的主从复制是否正常:有时候,同步已经停止,但管理人员却不知道。
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 'zabbix'@'%' identified by 'zabbix';
mysql> flush privileges;
2、登陆从服务器验证一下,,看是否正常。操作为:
mysql -uzabbix -pzabbix -e "show slave stutas\G"
3、在从服务器安装 zabbix_agentd,然后在配置文件zabbix_agentd.conf加入一行
UserParameter=mysql.slave,/opt/scripts/check_mysql_slave |grep OK -c
4、编写脚本/opt/scripts/check_mysql_slave(这是监控其作用的核心),其内容如下:
#!/bin/sh
declare -a slave_is
slave_is=($(/usr/local/mysql/bin/mysql -uzabbix -pzabbix -e "show slave status\G"|grep Running |awk '{print $2}'))
if [ "${slave_is[0]}" = "Yes" -a "${slave_is[1]}" = "Yes" ]
then
echo "OK -slave is running"
exit 0
else
echo "Critical -slave is error"
exit 2
fi
5、修改配置item、trigger,并测试。

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