Making Incremental Backups With tar
You can make tape backups. However, sometime tape is not an option. GNU tar allows you to make incremental backups with -g option. In this example, tar command will make incremental backup of /var/www/html, /home, and /etc directories, run:
# tar -g /var/log/tar-incremental.log -zcvf /backup/today.tar.gz /var/www/html /home /etc
Where,
* -g: Create/list/extract new GNU-format incremental backup and store information to /var/log/tar-incremental.log file.
Making MySQL Databases Backup
mysqldump is a client program for dumping or backing up mysql databases, tables and data. For example, the following command displays the list of databases:
$ mysql -u root -h localhost -p -Bse 'show databases'
Output:
Enter password:
brutelog
cake
faqs
mysql
phpads
snews
test
tmp
van
wp
Next, you can backup each database with the mysqldump command:
$ mysqldump -u root -h localhost -pmypassword faqs | gzip -9 > faqs-db.sql.gz
Creating A Simple Backup System For Your Installation
The main advantage of using FTP or NAS backup is a protection from data loss. You can use various protocols to backup data:
1. FTP
2. SSH
3. RSYNC
4. Other Commercial solutions
However, I am going to write about FTP backup solution here. The idea is as follows:
* Make a full backup every Sunday night i.e. backup everything every Sunday
* Next backup only those files that has been modified since the full backup (incremental backup).
* This is a seven-day backup cycle.
Our Sample Setup
Your-server ===> ftp/nas server
IP:202.54.1.10 ===> 208.111.2.5
Let us assume that your ftp login details are as follows:
* FTP server IP: 208.111.2.5
* FTP Username: nixcraft
* FTP Password: somepassword
* FTP Directory: /home/nixcraft (or /)
You store all data as follows:
=> /home/nixcraft/full/mm-dd-yy/files - Full backup
=> /home/nixcraft/incremental/mm-dd-yy/files - Incremental backup
Automating Backup With tar
Now, you know how to backup files and mysql databases using the tar and mysqldump commands. It is time to write a shell script that will automate entire procedure:
1. First, our script will collect all data from both MySQL database server and file system into a temporary directory called /backup using a tar command.
2. Next, script will login to your ftp server and create a directory structure as discussed above.
3. Script will dump all files from /backup to the ftp server.
4. Script will remove temporary backup from /backup directory.
5. Script will send you an email notification if ftp backups failed due to any reason.
You must have the following commands installed (use yum or apt-get package manager to install ftp client called ncftp):
* ncftp ftp client
* mysqldump command
* GNU tar command
Here is the sample script:
#!/bin/sh
# System + MySQL backup script
# Full backup day - Sun (rest of the day do incremental backup)
# Copyright (c) 2005-2006 nixCraft
# This script is licensed under GNU GPL version 2.0 or above
# Automatically generated by http://bash.cyberciti.biz/backup/wizard-ftp-script.php
# ---------------------------------------------------------------------
### System Setup ###
DIRS="/home /etc /var/www"
BACKUP=/tmp/backup.$$
NOW=$(date +"%d-%m-%Y")
INCFILE="/root/tar-inc-backup.dat"
DAY=$(date +"%a")
FULLBACKUP="Sun"
### MySQL Setup ###
MUSER="admin"
MPASS="mysqladminpassword"
MHOST="localhost"
MYSQL="$(which mysql)"
MYSQLDUMP="$(which mysqldump)"
GZIP="$(which gzip)"
### FTP server Setup ###
FTPD="/home/vivek/incremental"
FTPU="vivek"
FTPP="ftppassword"
FTPS="208.111.11.2"
NCFTP="$(which ncftpput)"
### Other stuff ###
EMAILID="admin@theos.in"
### Start Backup for file system ###
[ ! -d $BACKUP ] && mkdir -p $BACKUP || :
### See if we want to make a full backup ###
if [ "$DAY" == "$FULLBACKUP" ]; then
FTPD="/home/vivek/full"
FILE="fs-full-$NOW.tar.gz"
tar -zcvf $BACKUP/$FILE $DIRS
else
i=$(date +"%Hh%Mm%Ss")
FILE="fs-i-$NOW-$i.tar.gz"
tar -g $INCFILE -zcvf $BACKUP/$FILE $DIRS
fi
### Start MySQL Backup ###
# Get all databases name
DBS="$($MYSQL -u $MUSER -h $MHOST -p$MPASS -Bse 'show databases')"
for db in $DBS
do
FILE=$BACKUP/mysql-$db.$NOW-$(date +"%T").gz
$MYSQLDUMP -u $MUSER -h $MHOST -p$MPASS $db | $GZIP -9 > $FILE
done
### Dump backup using FTP ###
#Start FTP backup using ncftp
ncftp -u"$FTPU" -p"$FTPP" $FTPS<
mkdir $FTPD/$NOW
cd $FTPD/$NOW
lcd $BACKUP
mput *
quit
EOF
### Find out if ftp backup failed or not ###
if [ "$?" == "0" ]; then
rm -f $BACKUP/*
else
T=/tmp/backup.fail
echo "Date: $(date)">$T
echo "Hostname: $(hostname)" >>$T
echo "Backup failed" >>$T
mail -s "BACKUP FAILED" "$EMAILID" <$T
rm -f $T
fi
How Do I Setup a Cron Job To Backup Data Automatically?
Just add cron job as per your requirements:
13 0 * * * /home/admin/bin/ftpbackup.sh >/dev/null 2>&1
Generate FTP backup script
Since I setup many Linux boxes, here is my own FTP backup script generator. You just need to provided appropriate input and it will generate FTP backup script for you on fly.
REFERENCE
http://www.cyberciti.biz/tips/how-to-backup-mysql-databases-web-server-files-to-a-ftp-server-automatically.html
