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.tgzDBName=mysqlDBUser=rootDBPasswd=BackupPath=/root/LogFile=/root/db.logDBPath=/var/lib/mysql/#BackupMethod=mysqldump#BackupMethod=mysqlhotcopy#BackupMethod=tar#Setting End
NewFile="$BackupPath"db$(date +%y%m%d).tgzDumpFile="$BackupPath"db$(date +%y%m%d)OldFile="$BackupPath"db$(date +%y%m%d --date='5 days ago').tgz
echo "-------------------------------------------" >> $LogFileecho $(date +"%y-%m-%d %H:%M:%S") >> $LogFileecho "--------------------------" >> $LogFile#Delete Old Fileif [ -f $OldFile ]then
rm -f $OldFile >> $LogFile 2>&1
echo "[$OldFile]Delete Old File Success!" >> $LogFileelse
echo "[$OldFile]No Old Backup File!" >> $LogFilefi
if [ -f $NewFile ]then
echo "[$NewFile]The Backup File is exists,Can't Backup!" >> $LogFileelse
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
;;
esacfi
echo "-------------------------------------------" >> $LogFile
