定期自动备份mysql的shell脚本(实例分享)

#!/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 
# edit by www.jb200.com
db_user="root" 
db_passwd="www.jb200.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 path 
MYSQL="/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 backup 
test -d "$backup_dir/backup.5/" && $RM -rf "$backup_dir/backup.5"

# rotate backup directory 
for 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;

# /root/mysql_backup.sh

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