目的：定時(shí)監(jiān)控MySQL主從數(shù)據(jù)庫(kù)是否同步，如果不同步，記錄故障時(shí)間，并執(zhí)行命令使主從恢復(fù)同步狀態(tài)
1、創(chuàng)建腳本文件
vi /home/crontab/check_mysql_slave.sh #編輯，添加下面代碼
#!/bin/sh# check_mysql_slave statusip=eth0 #網(wǎng)卡名稱mysql_binfile=/usr/local/mysql/bin/mysqlmysql_user=root #MySQL數(shù)據(jù)庫(kù)賬號(hào)mysql_pass=123456 #密碼mysql_sockfile=/tmp/mysql.sockdatetime=`date +"%Y-%m-%d/%H:%M:%S"` #獲取當(dāng)前時(shí)間mysql_slave_logfile=/home/logs/check_mysql_slave.log #日志文件路徑，必須提前創(chuàng)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!"elseecho " $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 $mysql_sockfile -e "EXIT"fi :wq! #保存退出chmod +x /home/crontab/check_mysql_slave.sh #添加腳本執(zhí)行權(quán)限
2、添加任務(wù)計(jì)劃，修改/etc/crontab
vi /etc/crontab #在最后一行添加*/10 * * * * root /home/crontab/check_mysql_slave.sh #表示每10分鐘執(zhí)行一次:wq! #保存退出
3、重新啟動(dòng)crond使設(shè)置生效
/etc/rc.d/init.d/crond restart #yum install -y vixie-cron安裝計(jì)劃任務(wù)，某些系統(tǒng)上可能沒(méi)有預(yù)裝chkconfig crond on #設(shè)為開機(jī)啟動(dòng)service crond start #啟動(dòng)
可以根據(jù)日志文件/home/logs/check_mysql_slave.log查看MySQL主從同步狀態(tài)
PS：接下來(lái)這個(gè)腳本增加了“當(dāng)發(fā)現(xiàn)同步出現(xiàn)無(wú)法同步的時(shí)候”會(huì)自動(dòng)提取主庫(kù)的file號(hào)，以及pos,進(jìn)行同步主庫(kù)，腳本內(nèi)容如下：
#!/bin/sh#set -x#file is slave_repl.sh#Author by Kevin#date is 2011-11-13mstool="/usr/local/mysql-3307/bin/mysql -h 192.168.1.106 -uroot -pw!zl7POg27 -P 3307"sltool="/usr/local/mysql-3307/bin/mysql -h 192.168.1.107 -uroot -pw!zl7POg27 -P 3307"declare -a slave_statslave_stat=($($sltool -e "show slave status/G"|grep Running |awk '{print $2}'))if [ "${slave_stat[0]}" = "Yes" -a "${slave_stat[1]}" = "Yes" ] then echo "OK slave is running" exit 0else echo "Critical slave is error" echo echo "*********************************************************" echo "Now Starting replication with Master Mysql!" file=`$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 2fi 運(yùn)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: YesNow Replication is Finished!**********************************************************
