《Mysql必讀CentOS下編寫shell腳本來監控MySQL主從復制的教程》要點：
本文介紹了Mysql必讀CentOS下編寫shell腳本來監控MySQL主從復制的教程，希望對您有用。如果有疑問，可以聯系我們。
MYSQL學習目的：定時監控MySQL主從數據庫是否同步,如果不同步,記錄故障時間,并執行命令使主從恢復同步狀態
MYSQL學習1、創建腳本文件
MYSQL學習
vi /home/crontab/check_mysql_slave.sh #編輯,添加下面代碼
MYSQL學習
#!/bin/sh
# check_mysql_slave status
ip=eth0 #網卡名稱
mysql_binfile=/usr/local/mysql/bin/mysql
mysql_user=root #MySQL數據庫賬號
mysql_pass=123456 #密碼
mysql_sockfile=/tmp/mysql.sock
datetime=`date +"%Y-%m-%d/%H:%M:%S"` #獲取當前時間
mysql_slave_logfile=/home/logs/check_mysql_slave.log #日志文件路徑,必須提前創建好
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 $mysql_sockfile -e "EXIT"
fi
MYSQL學習
:wq! #保存退出
chmod +x /home/crontab/check_mysql_slave.sh #添加腳本執行權限
MYSQL學習2、添加任務計劃,修改/etc/crontab
MYSQL學習
vi /etc/crontab #在最后一行添加
*/10 * * * * root /home/crontab/check_mysql_slave.sh #表示每10分鐘執行一次
:wq! #保存退出
MYSQL學習3、重新啟動crond使設置生效
MYSQL學習
/etc/rc.d/init.d/crond restart #yum install -y vixie-cron安裝計劃任務,某些系統上可能沒有預裝
chkconfig crond on #設為開機啟動
service crond start #啟動
MYSQL學習可以根據日志文件/home/logs/check_mysql_slave.log查看MySQL主從同步狀態
MYSQL學習PS：接下來這個腳本增加了“當發現同步出現無法同步的時候”會自動提取主庫的file號,以及pos,進行同步主庫,腳本內容如下：
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MYSQL學習
#!/bin/sh
#set -x
#file is slave_repl.sh
#Author by Kevin
#date is 2011-11-13
mstool="/usr/local/mysql-3307/bin/mysql -h 192.168.1.106 -uroot -pw!zl7POg27 -P 3307"
sltool="/usr/local/mysql-3307/bin/mysql -h 192.168.1.107 -uroot -pw!zl7POg27 -P 3307"
declare -a slave_stat
slave_stat=($($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
MYSQL學習
# ./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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