CentOS下编写shell脚本来监控MySQL主从复制的教程

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!
**********************************************************