We use crontab and mysqldump to automatically backup mysql database

1. The simple way (only backup without crontab and manually)
   $ mysqldump -u mysql_user -pmysql_password your_database > your_back_up_path/your_database.sql

2. A little complex (well identified name)
   $ mysqldump -u mysql_user -pmysql_password your_database > your_back_up_path/”(date +”%H:%M-%d-%m-%Y”)”.sql

3. Add crontab
   Store mysqldump command to a file

$ vim /root/backup.sh
add: mysqldump -u mysql_user -pmysql_password your_database > /your_back_up_path/”(date +”%H:%M-%d-%m-%Y”)”.sql
save and exit
$ chmod 777 /root/backup.sh
$ chmod 777 /your_back_up_path
now we set crontab
$ crontab -e
add:
30 12 * /root/backup.sh
30 23 * /root/backup.sh
save and exit
This means auto Automatic execution of the script at 12:30 and 23:30 each day
4.More complex (crontab and store it five days and then delete it)
next is content of /root/backup.sh, you need to modify db_user, db_passwd, backup_dir, and db.

!/bin/sh

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=”231212″
db_host=”localhost”
db=”cloud”

the directory for story your backup file.

backup_dir=”/var/backup”

date format for backup file (dd-mm-yyyy)

time=”$(date +”%H:%M-%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.10/” && $RM -rf “$backup_dir/backup.10”

rotate backup directory

for int in 9 8 7 6 5 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;
save and exit
now we set crontab
$ crontab -e
add:
30 12 * /root/backup.sh
30 23 * /root/backup.sh
save and exit
This means auto Automatic execution of the script at 12:30 and 23:30 each day
Don’t forget chmod 777 /root/backup.sh and your backup file path