semovy

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