MySQL主从延迟监控脚本(pt

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 -xif [ $# -ne 3 ];then      echo "usage:"      echo "ck_slave_lag.sh"      exit 0;fi# Author : Leshami# Blog   : http://blog.csdn.net/leshamiServerID=$1MaxLag=$2LogDir=$3Timestamp=`date +%Y%m%d_%H%M%S`Rentition=7LogFile=$LogDir/slave_lag_$Timestamp.logLagDetail=$LogDir/slave_lag_Detail_$Timestamp.logmailadd=leshami@12306.cnecho $ServerIDecho $MaxLagecho $LogDirecho $LogFileecho $LagDetailecho $mailaddif [ ! -d $LogDir ];then    mkdir -p $LogDirfiLag=`/usr/bin/pt-heartbeat --user=monitor --password=xxx -S /tmp/mysql.sock -D test --master-server-id=$ServerID --check`Lag=`echo ${Lag%.*}`#Lag=3echo $LagptStatus=`ps -ef|grep pt-heart|grep daemonize`echo $ptStatusif [ $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`." $mailadd    fifiif [ -n "$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    fifi# Remove history slave lag log.find $LogDir -name "*slave_lag*" -ctime +$Rentition -delete exit

3、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，