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# c

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

1. 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：  

1. ./slave_stop3307.sh

   ---

   Now stop Slave Replication! Slave_IO_Running: No Slave_SQL_Running: No

   ---

2. ./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!

   ---