CentOS下编写shell脚本来监控MySQL主从复制的教程_MySQL

目的：定时监控MySQL主从数据库是否同步，如果不同步，记录故障时间，并执行命令使主从恢复同步状态

1、创建脚本文件

vi  /home/crontab/check_mysql_slave .sh   #编辑，添加下面代码

#!/bin/sh

# check_mysql_slave status

ip=eth0 #网卡名称

mysql_binfile=/usr/local/mysql/bin/mysql

mysql_user=root #MySQL数据库账号

mysql_pass=123456 #密码

mysql_sockfile=/tmp/mysql.sock

datetime=`date +"%Y-%m-%d/%H:%M:%S"`  #获取当前时间

mysql_slave_logfile=/home/logs/check_mysql_slave.log  #日志文件路径，必须提前创建好

slave_ip=`ifconfig $ip|grep "inet addr" | awk -F[:" "]+ '{print $4}'`

status=$($mysql_binfile -u$mysql_user -p$mysql_pass -S
$mysql_sockfile -e "show slave status\G" | grep -i "running")

Slave_IO_Running=`echo $status | grep Slave_IO_Running | awk ' {print $2}'`

Slave_SQL_Running=`echo $status | grep Slave_SQL_Running | awk '{print $2}'`

if [ "$Slave_IO_Running" = "Yes" -a "$Slave_SQL_Running" = "Yes" ]

then echo "Slave is Running!"

else

echo " $datetime $slave_ip Slave is not running!" >> $mysql_slave_logfile

$mysql_binfile -u$mysql_user -p$mysql_pass -S $mysql_sockfile -e "SLAVE STOP;"

$mysql_binfile -u$mysql_user -p$mysql_pass -S $mysql_sockfile -e "SET GLOBAL SQL_SLAVE_SKIP_COUNTER=1;"

$mysql_binfile -u$mysql_user -p$mysql_pass -S $mysql_sockfile -e "SLAVE START;"

$mysql_binfile -u$mysql_user -p$mysql_pass -S $mysql_sockfile -e "EXIT"

fi

:wq!  #保存退出

chmod  +x  /home/crontab/check_mysql_slave .sh  #添加脚本执行权限

2、添加任务计划，修改/etc/crontab

vi  /etc/crontab  #在最后一行添加

* /10  * * * * root  /home/crontab/check_mysql_slave .sh  #表示每10分钟执行一次

:wq!  #保存退出

3、重新启动crond使设置生效

/etc/rc .d /init .d /crond  restart   #yum install -y vixie-cron安装计划任务，某些系统上可能没有预装

chkconfig crond on  #设为开机启动

service crond start  #启动

可以根据日志文件/home/logs/check_mysql_slave.log查看MySQL主从同步状态

PS：接下来这个脚本增加了“当发现同步出现无法同步的时候”会自动提取主库的file号，以及pos,进行同步主库，脚本内容如下：

#!/bin/sh
#set -x
#file is slave_repl.sh
#Author by Kevin
#date is 2011-11-13

mstool= "/usr/local/mysql-3307/bin/mysql -h 192.168.1.106 -uroot -pw!zl7POg27 -P 3307"
sltool= "/usr/local/mysql-3307/bin/mysql -h 192.168.1.107 -uroot -pw!zl7POg27 -P 3307"
declare  -a slave_stat
slave_stat=($($sltool -e  "show slave status\G" | grep  Running | awk  '{print $2}' ))
if  [  "${slave_stat[0]}"  =  "Yes"  -a  "${slave_stat[1]}"  =  "Yes"  ]
   then
   echo  "OK slave is running"
   exit  0
else
   echo  "Critical slave is error"
   echo
   echo  "*********************************************************"
   echo  "Now Starting replication with Master Mysql!"
    file =`$mstool -e  "show master status\G" | grep  "File" | awk  '{print $2}' `
    pos=`$mstool -e  "show master status\G" | grep  "Pos" | awk  '{print $2}' `
    $sltool -e "slave stop;change master to master_host= '192.168.1.106' ,
    master_port=3307,master_user= 'repl' ,
    master_password= 'w!zl7POg27' ,
    master_log_file= '$file' ,
    master_log_pos=$pos;slave start;"
    sleep  3
    $sltool -e  "show slave status\G;" | grep  Running
  echo
  echo  "Now Replication is Finished!"
  echo
  echo  "**********************************************************"
    exit  2
fi

运行后效果，如下：

# ./slave_stop3307.sh
*******************************
Now stop Slave Replication!
      Slave_IO_Running: No
     Slave_SQL_Running: No
*******************************
# ./slave_repl3307.sh
Critical slave is error
*********************************************************
Now Starting replication with Master Mysql!
      Slave_IO_Running: Yes
     Slave_SQL_Running: Yes
Now Replication is Finished!
**********************************************************

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