Linux下备份MySQL所有数据库的脚本

#!/bin/sh
# mysql_backup_alldb.sh: backup mysql all databases and keep newest 15 days backup.
# -----------------------------
db_user="root"
db_host="localhost"

# the directory for story your backup file.
backup_dir="/opt/backup/mysqldb1/data"

# mysql, mysqldump and some other bin's path
MYSQL="$(which mysql)"
MYSQLDUMP="$(which mysqldump)"
MKDIR="$(which mkdir)"
RM="$(which rm)"
MV="$(which mv)"
GZIP="$(which 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" && $MKDIR "$backup_dir"

# date format for backup file (dd-mm-yyyy)
time="$(date +"%Y-%m-%d")"

# get all databases
alldbs=`$MYSQL -u $db_user -e "show databases;"| awk '!/Database/&&!/information_schema/'`

for db in $alldbs
do
$MYSQLDUMP -u $db_user -h $db_host $db | $GZIP -9 > "$backup_dir/$time.$db.gz"
done

#delete the oldest backup 15 days ago
find $backup_dir -name "*.gz" -mtime +15 |xargs rm -rf

exit 0;