mysql全量备份、增量备份实现方法

                    

mysql全量备份、增量备份。开启mysql的logbin日志功能。在/etc/my.cnf文件中加入以下代码:

[mysqld]
log-bin = "/home/mysql/logbin.log"
binlog-format = ROW
log-bin-index = "/home/mysql/logindex"
binlog_cache_size=32m
max_binlog_cache_size=512m
max_binlog_size=512m
 

重启mysql即可。其中路径 /home/mysql的用户和组要改成mysql。

 

2、增量备份
在/home/mysql/目录下建立以下目录:

 

增量备份脚本

cd /home/mysql

vi binlogbak.sh

#!/bin/bash

export LANG=en_US.UTF-8

BakDir=/home/mysql/backup/daily

BinDir=/home/mysql

LogFile=/home/mysql/backup/binlog.log

BinFile=/home/mysql/logindex.index

mysqladmin -uroot -proot123 flush-logs

#这个是用于产生新的mysql-bin.00000*文件

Counter=wc -l $BinFile |awk '{print $1}'

NextNum=0

#这个for循环用于比对 C o u n t e r , Counter, Counter,NextNum这两个值来确定文件是不是存在或最新的。

for file in cat $BinFile

do

    base=basename $file

    #basename用于截取mysql-bin.00000*文件名,去掉./mysql-bin.000005前面的./

    NextNum=expr $NextNum + 1

    if [ N e x t N u m < / s p a n > − e q < s p a n c l a s s = " h l j s − v a r i a b l e " > NextNum -eq NextNum</span>eq<spanclass="hljsvariable">Counter ]

    then

        echo KaTeX parse error: Expected 'EOF', got '&' at position 19: …e skip! &̲gt;> LogFile

    else

        dest= B a k D i r < / s p a n > / < s p a n c l a s s = " h l j s − v a r i a b l e " > BakDir/ BakDir</span>/<spanclass="hljsvariable">base

        if(test -e $dest)

        #test -e用于检测目标文件是否存在,存在就写exist!到$LogFile去。

        then

            echo KaTeX parse error: Expected 'EOF', got '&' at position 20: … exist! &̲gt;> LogFile

        else

            cp B i n D i r < / s p a n > / < s p a n c l a s s = " h l j s − v a r i a b l e " > BinDir/ BinDir</span>/<spanclass="hljsvariable">base $BakDir

            echo KaTeX parse error: Expected 'EOF', got '&' at position 21: …/span> copying &̲gt;> LogFile

        fi

    fi

done

echo date +"%Y年%m月%d日 %H:%M:%S" Bakup succ! >> $LogFile


?赋予binlogbak.sh执行权限

chmod a+x /home/mysql/binlogbak.sh


3、全量备份

 

vi databak.sh

#!/bin/bash

export LANG=en_US.UTF-8

BakDir=/home/mysql/backup

LogFile=/home/mysql/backup/bak.log

Date=date +%Y%m%d

Begin=date +"%Y年%m月%d日 %H:%M:%S"

cd $BakDir

DumpFile=$Date.sql

GZDumpFile=$Date.sql.tgz

mysqldump -uroot -proot123 --all-databases --flush-logs --delete-master-logs --single-transaction > $DumpFile

tar -czvf G Z D u m p F i l e < / s p a n > < s p a n c l a s s = " h l j s − v a r i a b l e " > GZDumpFile GZDumpFile</span><spanclass="hljsvariable">DumpFile

rm $DumpFile

count=$(ls -l *.tgz |wc -l)

if [ $count -ge 5 ]

then

file=$(ls -l *.tgz |awk ‘{print $9}’|awk ‘NR==1’)

rm -f $file

fi

#只保留过去四周的数据库内容

Last=date +"%Y年%m月%d日 %H:%M:%S"

echo 开始: B e g i n < / s p a n > 结 束 : < s p a n c l a s s = " h l j s − v a r i a b l e " > Begin 结束: Begin</span>:<spanclass="hljsvariable">Last KaTeX parse error: Expected 'EOF', got '&' at position 24: …le succ &̲gt;> LogFile

cd $BakDir/daily

rm -f *


 

赋予databak.sh 执行权限

chmod a+x /home/mysql/databak.sh


?4、开启定时任务

vi /etc/crontab

#每个星期日凌晨3:00执行完全备份脚本

0 3 * * 0 /home/mysql/databak.sh >/dev/null 2>&1

#周一到周六凌晨3:00做增量备份

0 3 * * 1-6 /home/mysql/binlogbak.sh >/dev/null 2>&1

 

 

使上述定时任务生效

crontab /etc/crontab


查看定时任务

crontab -l

完成。

 

 

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