nagios 监控 mysql 主从同步状态

转自 :http://blog.163.com/ly_89/blog/static/18690229920111129113543770/

nagios 监控 mysql 主从同步状态

作为一名运维人员,对于 Mysql 的主从同步我们并不陌生。我们如何能得知主从库是否在实时的同步呢?每隔一分钟登录到数据库到数据库执行 show slave status\G  显然是不靠谱。不要忘记我们有监控之神 nagios,我们可以通过 nagios 来监控主从库的同步状态。那如何来实现nagios 监控 mysql 主从同步状态呢?

我们都知道登录到 mysql 数据库之后,通过 show slave status\G 查看其输出,即可以判断主从复制是否正常,下面来看某个服务器懂得输出

 

mysql> show slave status\G
*************************** 1. row ***************************
             Slave_IO_State: Waiting for master to send event
                Master_Host: 172.16.117.251
                Master_User: test1
                Master_Port: 3306
              Connect_Retry: 60
            Master_Log_File: mysql-bin.000008
        Read_Master_Log_Pos: 16755097
             Relay_Log_File: Slave_sql-relay-bin.000728
              Relay_Log_Pos: 235
      Relay_Master_Log_File: mysql-bin.000008
           Slave_IO_Running: Yes
          Slave_SQL_Running: Yes
            Replicate_Do_DB: 
        Replicate_Ignore_DB: 
         Replicate_Do_Table: 
     Replicate_Ignore_Table: 
    Replicate_Wild_Do_Table: 
Replicate_Wild_Ignore_Table: 
                 Last_Errno: 0
                 Last_Error: 
               Skip_Counter: 0
        Exec_Master_Log_Pos: 16755097
            Relay_Log_Space: 235
            Until_Condition: None
             Until_Log_File: 
              Until_Log_Pos: 0
         Master_SSL_Allowed: No
         Master_SSL_CA_File: 
         Master_SSL_CA_Path: 
            Master_SSL_Cert: 
          Master_SSL_Cipher: 
             Master_SSL_Key: 
      Seconds_Behind_Master: 0
1 row in set (0.00 sec)

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"就表明主从库同步成功

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nagios 监控 Mysql 主从同步的操作步骤:

第一部分:客户端配置

1. 编写脚本/usr/local/nagios/libexec/check_mysql_slave (这个脚本是监控mysql 主从同步状态的核心)

 #!/bin/sh 
slave_is=($(/usr/local/mysql/bin/mysql -uroot -pabc   -e "show slave status\G"|grep Running |awk '{print $2}')) 
if [ "${slave_is[0]}" = "Yes" -a "${slave_is[1]}" = "Yes" ] 
     then 
     echo "OK C2-slave is running" 
     exit 0 
else 
     echo "Critical C2-slave is error" 
     exit 2 
fi
   

2. 编辑 /usr/local/nagios/libexec/etc/nrpe.cfg 加入监控 mysql 主从状态同步的命令

 command[check_mysql_slave]=/usr/local/nagios/libexec/check_mysql_slave
   

3. 启动 nrpe 服务,并检查其端口是否监听

 [root@Slave_sql libexec]#  /usr/local/nagios/bin/nrpe -c /usr/local/nagios/etc/nrpe.cfg -d [root@Slave_sql libexec]# netstat -npl | grep nrpe
tcp        0      0 0.0.0.0:5666                0.0.0.0:*                   LISTEN      27500/nrpe          

 

4. 启动 mysql 服务手动执行该脚本

 [root@Slave_sql libexec]#  ./check_mysql_slave

OK C2-slave is running

   

   5. 关闭 mysql 服务手动执行该脚本

  [root@Slave_sql libexec]#  ./check_mysql_slave

Critical C2-slave is error

   

 

第二部分:服务器端的配置:

1. 编辑 /usr/local/nagios/etc/objects/host.cfg 定义监控的 client

 define host {

use                     linux-server
host_name               195-Slave-mysql
address                     192.35.91.195
check_command           check-host-alive
max_check_attempts      3
normal_check_interval   2
retry_check_interval    2
check_period            24x7
notification_interval   300
notification_period     24x7
notification_options    d,u,r
contact_groups          admins
process_perf_data       1
action_url /nagios/pnp/index.php?host=$HOSTNAME$&srv=$SERVICEDESC$
}

   

2. 编辑 /usr/local/nagios/etc/objects/ service.cfg

 

define service {
use                   generic-service
host_name             195-Slave-mysql
service_description   check_mysql_replication_status
check_command         check_nrpe!check_mysql_slave

max_check_attempts    2
normal_check_interval 2
retry_check_interval  2
check_period          24x7
notification_interval 10
notification_period   24x7
notification_options  w,u,c,r
contact_groups        admins
process_perf_data     1
action_url /nagios/pnp/index.php?host=$HOSTNAME$&srv=$SERVICEDESC$
}

   

3. 重启 nagios 和 apache 服务

 [root@node2 objects]# /etc/init.d/nagios restart
Running configuration check...done.
Stopping nagios: done.
Starting nagios: done.
[root@node2 objects]# /etc/init.d/httpd restart
Stopping httpd: [  OK  ]
Starting httpd: [  OK  ]
   

查看 nagios 监控图像

nagios 监控 mysql 主从同步状态 - 倾听 晚秋 - 倾听 晚秋
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