mysql自动备份脚本

#!/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 




简单的shell脚本: 
!#/bin/sh
/ｘｘｘ／ｘｘｘ／mysql/bin/mysqldump -uroot -ppasswd --opt database_name > dbbak.sql 
然后通过crontab自动执行以上shell脚本就可以了 


--opt是制定数据库的
passwd是你自己设置mysql数据库root用户的密码 

mysql安装完，默认root没有密码 

如果没有密码就不要管它了mysqldump -uroot -p --opt database_name >xxxx.sql 即可。