可以將這個腳本放進crontab，每天凌晨執行一次，自動備份這個腳本每天最多只執行一次，而且只保留最近五天的備份在服務器上。

代碼:

#!/bin/bash
#this is a shellscript for auto db backup
#powered by searchdatabase
#2005-09

#setting
#設置數據庫名，數據庫登錄名，密碼，備份路徑，日志路徑，數據文件位置，以及備份方式
#默認情況下備份方式是tar，還可以是mysqldump,mysqldotcopy
#默認情況下，用root(空)登錄mysql數據庫，備份至/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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