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如何才能实现MySQL的自动备份_MySQL

时间:2021-07-01 10:21:17 帮助过:26人阅读

  MySql自动备份是非常关键的,特别是对于DBA来说。这里主要用代码来说明这个问题,希望对各位有所帮助。可以将这个脚本放进crontab,每天凌晨执行一次,自动备份。

  这个脚本每天最多只执行一次,而且只保留最近五天的备份在服务器上。

  代码:

  
#!/bin/bash
#This is a ShellScript For Auto DB Backup
#Powered by aspbiz
#2004-09

  #Setting
#设置数据库名,数据库登录名,密码,备份路径,日志路径,数据文件位置,以及备份方式
#默认情况下备份方式是tar,还可以是mysqldump,mysqldotcopy
#默认情况下,用root(空)登录mysql数据库,备份至/root/dbxxxxx.tgz
DBName=mysql
DBUser=root
DBPasswd=
BackupPath=/root/
LogFile=/root/db.log
DBPath=/var/lib/mysql/
#BackupMethod=mysqldump
#BackupMethod=mysqlhotcopy
#BackupMethod=tar
#Setting End

  
NewFile="$BackupPath"db$(date +%y%m%d).tgz
DumpFile="$BackupPath"db$(date +%y%m%d)
OldFile="$BackupPath"db$(date +%y%m%d --date='5 days ago').tgz

  echo "-------------------------------------------" >> $LogFile
echo $(date +"%y-%m-%d %H:%M:%S") >> $LogFile
echo "--------------------------" >> $LogFile
#Delete Old File
if [ -f $OldFile ]
then
  rm -f $OldFile >> $LogFile 2>&1
  echo "[$OldFile]Delete Old File Success!" >> $LogFile
else
  echo "[$OldFile]No Old Backup File!" >> $LogFile
fi

  if [ -f $NewFile ]
then
  echo "[$NewFile]The Backup File is exists,Can't Backup!" >> $LogFile
else
  case $BackupMethod in
  mysqldump)
   if [ -z $DBPasswd ]
   then
     mysqldump -u $DBUser --opt $DBName > $DumpFile
   else
     mysqldump -u $DBUser -p$DBPasswd --opt $DBName > $DumpFile
   fi
   tar czvf $NewFile $DumpFile >> $LogFile 2>&1
   echo "[$NewFile]Backup Success!" >> $LogFile
   rm -rf $DumpFile
   ;;
  mysqlhotcopy)
   rm -rf $DumpFile
   mkdir $DumpFile
   if [ -z $DBPasswd ]
   then
     mysqlhotcopy -u $DBUser $DBName $DumpFile >> $LogFile 2>&1
   else
     mysqlhotcopy -u $DBUser -p $DBPasswd $DBName $DumpFile >>$LogFile 2>&1
   fi
   tar czvf $NewFile $DumpFile >> $LogFile 2>&1
   echo "[$NewFile]Backup Success!" >> $LogFile
   rm -rf $DumpFile
   ;;
  *)
   /etc/init.d/mysqld stop >/dev/null 2>&1
   tar czvf $NewFile $DBPath$DBName >> $LogFile 2>&1
   /etc/init.d/mysqld start >/dev/null 2>&1
   echo "[$NewFile]Backup Success!" >> $LogFile
   ;;
  esac
fi

  echo "-------------------------------------------" >> $LogFile

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