MySQL master-slave delay monitoring script (pt-heartbeat)
对于MySQL数据库主从复制延迟的监控，我们可以借助percona的有力武器pt-heartbeat来实现。pt-heartbeat通过使用时间戳方式在主库上更新特定表，然后在从库上读取被更新的时间戳然后与本地系统时间对比来得出其延迟。本文主要是通过脚本来定期检查从库与主库复制的延迟度并发送邮件，供大家参考。
有关pt-heartbeat工具的安装可以参考：percona-toolkit的安装及简介
有关pt-heartbeat工具的介绍可以参考：使用pt-heartbeat监控主从复制延迟
1、脚本概述
a、脚本定期使用--check方式单次检查当前的延迟性(定期的方式可以使用cron job比如每1分钟或5分钟)
b、通过设定指定的延迟阀值来判断当时的延迟性是否在可控范围
c、一旦当前的延迟大于指定阀值，则马上使用--monitor方式不停的监控其延迟性并写入到日志文件
d、对于--monitor方式，其进程运行超过30分钟，自kill其进程，以避免无限期运行导致日志过大，空间不够用
2、脚本内容
[mysql@SZDB run]$ more ck_slave_lag.sh
#!/bin/bash
#set -x
if [ $# -ne 3 ];then
echo "usage:"
echo "ck_slave_lag.sh <Servier-id> <MaxLag> <LogDir>"
exit 0;
fi
# Author : Leshami
# Blog : http://www.php.cn/
ServerID=$1
MaxLag=$2
LogDir=$3
Timestamp=`date +%Y%m%d_%H%M%S`
Rentition=7
LogFile=$LogDir/slave_lag_$Timestamp.log
LagDetail=$LogDir/slave_lag_Detail_$Timestamp.log
mailadd=leshami@12306.cn
echo $ServerID
echo $MaxLag
echo $LogDir
echo $LogFile
echo $LagDetail
echo $mailadd
if [ ! -d $LogDir ];then
mkdir -p $LogDir
fi
Lag=`/usr/bin/pt-heartbeat --user=monitor --password=xxx -S /tmp/mysql.sock -D test --master-server-id=$ServerID --check`
Lag=`echo ${Lag%.*}`
#Lag=3
echo $Lag
ptStatus=`ps -ef|grep pt-heart|grep daemonize`
echo $ptStatus
if [ $Lag -gt $MaxLag ]; then
echo "The current date is `date` at `hostname`." >>$LogFile
echo "The current lag log file is $LogFile." >>$LogFile
echo "The current replication lag is $Lag." >>$LogFile
echo "The replication lag is larger than max lag $MaxLag." >>$LogFile
if [ -z "$ptStatus" ] ; then
echo "Start a monitor daemon with below command: " >>$LogFile
echo "pt-heartbeat --user=monitor --password=xxx -S /tmp/mysql.sock -D test " >>$LogFile
echo " --master-server-id=11 --monitor --print-master-server-id --daemonize --log=$LagDetail" >>$LogFile
/usr/bin/pt-heartbeat --user=monitor --password=xxx -S /tmp/mysql.sock -D test \
--master-server-id=$ServerID --monitor --print-master-server-id --daemonize --log=$LagDetail
echo "More detail please check lag log from $LagDetail." >>$LogFile
cat $LogFile | mutt -s "Found slave lag on `hostname`." $mailadd
fi
fi
if [ -n "$ptStatus" ] ; then
STime=`ps -ef|grep pt-heart|grep daemonize |gawk '{print $5}'`
Pid=`ps -ef|grep pt-heart|grep daemonize |gawk '{print $2}'`
STime=`date '+%Y%m%d'`" "$STime
s_STime=`date -d "$STime" '+%s'`
s_ETime=`date +%s`
DiffSec=`expr $s_ETime - $s_STime`
echo $STime
echo $s_STime
echo $s_ETime
echo $DiffSec
if [ "$DiffSec" -gt 1800 ]; then
echo "kill -9 $Pid"
kill -9 $Pid
fi
fi
# Remove history slave lag log.
find $LogDir -name "*slave_lag*" -ctime +$Rentition -delete
exit3、部署参考
[mysql@SZDB run]$ crontab -l #check slave lag */1 * * * * /run/ck_slave_lag.sh 11 3 /log/SlaveLag
以上就是MySQL 主从延迟监控脚本(pt-heartbeat)的内容，更多相关内容请关注PHP中文网（www.php.cn）！
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