linux 定期自动备份mysql的shell

数据无价，及时备份 
刚才有个玩家在站上玩游戏，提醒了我要及时备份数据啊，万一哪天服务器挂了把他们的数据丢了，我可就是罪人了！ 
一直打算放个自动备份的shell，都没有放。正好现在不忙，随手加了进去。 
安全起见，直接用Root执行的： 
/root/mysql_backup.sh 

# everyday 3:00 AM execute database backup 
3 0 * * * /root/mysql_backup.sh 

以下是自动自动备份shell，只保留最新5天

#!/bin/sh # mysql_backup.sh: backup mysql databases and keep newest 5 days backup. # # db_user is mysql username # db_passwd is mysql password # db_host is mysql host # ----------------------------- db_user="root" db_passwd="zhoz.com"db_host="localhost"# the directory for story your backup file. backup_dir="/home/zhozdbbackup"# date format for backup file (dd-mm-yyyy) time="$(date +"%d-%m-%Y")"# mysql, mysqldump and some other bin's pathMYSQL="/usr/bin/mysql" MYSQLDUMP="/usr/bin/mysqldump" MKDIR="/bin/mkdir"RM="/bin/rm"MV="/bin/mv"GZIP="/bin/gzip"# check the directory for store backup is writeable test ! -w $backup_dir && echo "Error: $backup_dir is un-writeable." && exit 0# the directory for story the newest backup test ! -d "$backup_dir/backup.0/" && $MKDIR "$backup_dir/backup.0/"# get all databases all_db="$($MYSQL -u $db_user -h $db_host -p$db_passwd -Bse 'show databases')" for db in $all_db do $MYSQLDUMP -u $db_user -h $db_host -p$db_passwd $db | $GZIP -9 > "$backup_dir/backup.0/$time.$db.gz" done# delete the oldest backuptest -d "$backup_dir/backup.5/" && $RM -rf "$backup_dir/backup.5"# rotate backup directoryfor int in 4 3 2 1 0 do if(test -d "$backup_dir"/backup."$int") then next_int=`expr $int + 1` $MV "$backup_dir"/backup."$int" "$backup_dir"/backup."$next_int" fi done exit 0;