Debian / Ubuntu Linux Install and Configure Remote Filesystem Snapshot with rsnapshot Incremental Backup Utility

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I would like to configure my Debian box to backup two remote servers using rsnapshot software. It should make incremental snapshots of local and remote filesystems for any number of machines on 2nd hard disk located at /disk1 ( /dev/sdb2). How do I install and use rsnapshot on a Ubuntu or Debian Linux server?

rsnapshot is perfect open source solution for making backups on local system. It supports both remote and local systems. From the man page:

rsnapshot saves much more disk space than you might imagine. The amount of space required is roughly the size of one full backup, plus a copy of each additional file that is changed. rsnapshot makes extensive use of hard links, so if the file doesn’t change, the next snapshot is simply a hard link to the exact same file. The following instructions are compatible with both Debian and Ubuntu Linux.

Required software on local backup system

  1. rsnapshot
  2. rsync
  3. ssh client and ssh-keys
  4. 2nd hard disk ( RAID array is suggested) – you can also use primary hard disk.
  5. Password less login configured using ssh keys
  6. /disk1/backup – Backup directory
  7. /disk1/backup/server1 – Backup directory for remote server called server1
  8. /disk1/backup/server2 – Backup directory for remote server called server2
  9. /disk1/backup/localhost – Backup directory for local server

Required software on remote server

  1. OpenSSH sshd server
  2. Password less login configured using ssh keys

Step #1: Install rsync and rsnapshot software

Use apt-get command to install rsync and rsnapshot packages, enter:
$ sudo apt-get install rsync rsnapshot
Sample outputs:

Fig.01: Installing rsnapshot using apt-get command
Fig.01: Installing rsnapshot using apt-get command

Step #2: Configure passwordless login / public key based login

Type the following commands to create ssh-keys on your local Linux system:
# ssh-keygen -t rsa
# ssh-copy-id -i $HOME/.ssh/id_rsa.pub [email protected]:.ssh/authorized_keys2
##[*** or use scp command instead of ssh-copy-id ***]##
# scp .ssh/id_rsa.pub [email protected]:.ssh/authorized_keys2

See how to configure RSA / DSA SSH public key based authentication.

Step #3: Configure rsnapshot utility

The configuration file is located at /etc/rsnapshot.conf. The configuration file requires tabs between elements and all directives require a trailing slash. Just open config file using a text editor such as vi or gedit:
# vi /etc/rsnapshot.conf
OR
$ sudo vi /etc/rsnapshot.conf
Set snapshots root directory:

snapshot_root	/disk1/backup/

Note you must separate snapshot_root and /disk1/ by a [tab] key i.e. type snapshot_root hit [tab] key once and type /disk1/backup/. All snapshots will be stored under this root directory (/disk1/backup/).

Configure backup policy

You can make hourly, daily, weekly or monthly snapshots of local and remote systems. To make a snapshot every four hours (six times a day) and keep a second set, which are taken once a day, and stored for a seven days, enter:

interval    hourly  6
interval    daily   7

Feel free to adapt configuration as per your backup needs.

Specify local and remote backup directories

Find out comments that read as follows:

###############################
### BACKUP POINTS / SCRIPTS ###
###############################

You need to comment out / delete default backup directories. To make snapshots for /home/, /etc/, /webroot/ directories to /disk1/backup/localhost, enter:

backup	/home/	localhost/
backup	/etc/	localhost/
backup	/webroot/	localhost/

To backup remote server1 /home/, /etc/, /var/spool/mail/, /webroot/ directories to /disk1/backup/server1, enter:

backup	[email protected]:/home/	server1/
backup	[email protected]:/etc/	server1/
backup	[email protected]:/webroot/	server1/
backup	[email protected]:/var/spool/mail/	server1/
backup	[email protected]:/home/	server2/

Save and close the file.

Test your config file for errors

Type the following to test your configuration file for errors
# rsnapshot configtest
Output:

Syntax OK

You can also run rsnapshot in a test mode to display its action:
# rsnapshot -t hourly

Step #4: Run rsnapshot for first time

To run first time, enter:
# rsnapshot hourly

Step #5: Configure cron job

Edit /etc/cron.d/rsnapshot file to setup backup snapshot job. This is a sample cron file for rsnapshot. The values used correspond to the examples in /etc/rsnapshot.conf. There you can also set the backup points and many other things. To activate this cron file you have to uncomment the lines below.
Feel free to adapt it to your needs.

0 */4         * * *           root    /usr/bin/rsnapshot hourly
30 3          * * *           root    /usr/bin/rsnapshot daily
0  3          * * 1           root    /usr/bin/rsnapshot weekly
30 2          1 * *           root    /usr/bin/rsnapshot monthly

See crontab related faq for more information about cronjob under UNIX / Linux.

How do I exclude files from backup?

rsnapshot allows you to set the include and exclude parameters, if enabled, simply get passed directly to rsync. If you have multiple include/exclude patterns, put each one on a separate line. For example,
exclude_file /etc/rsnapshot.server1.conf
Append exclude file list to /etc/rsnapshot.server1.conf:
# vi /etc/rsnapshot.server1.conf
Exclude files matching pattern from backup:

var/lib/php/session/*
/var/spool/mail/nobody/*
cache/wp-cache-*.????
/var/logs/apache/access.log.*
/var/logs/apache/error.log.*
/linux-kernel/*
/tmp/cache/*
/var/lib/mysql/mysql.sock*
/tmp/php.socket-*
/tmp/*socket*

Save and close the file.

How do I backup remote MySQL database?

You can backup default database directory /var/lib/mysql. However, you can backup remote or local MySQL database with the following script:

#!/bin/sh
NOW=$(date +"%d-%m-%Y")
# set mysql login info
MUSER="MySQL-UserNAME"                # Username
MPASS="MySQL-SERVER-PASSWORD"   # Password
MHOST="MySQL-SERVER-IP-ADDRESS"  # Server Name
# guess binary names 
MYSQL="$(which mysql)"
MYSQLDUMP="$(which mysqldump)"
GZIP="$(which gzip)"
 
# get all db names 
DBS="$($MYSQL -u $MUSER -h $MHOST -p$MPASS -Bse 'show databases')"
for db in $DBS
do
 FILE=mysql-$db.$NOW-$(date +"%T").gz
 $MYSQLDUMP -u $MUSER -h $MHOST -p$MPASS $db | $GZIP -9 > $FILE
done

Now add following line to /etc/rsnapshot.conf file:
backup_script /root/scripts/mysql.backup.sh server1/mysql/

How do I restore backup?

You can simply copy back file using regular scp / rsync command. In this example, restore all *.html file to remote web server called www-03.example.com:

rsync -av *.html user@www-03.example.com:/home/httpd/example/html/

How do I view backups?

Simply cd to backup location and run ls command:
# cd /disk1/backup/
# ls -l

Sample outputs:

Fig.02: Listing all backup files stored on backup server
Fig.02: Listing all backup files stored on backup server

Further readings:

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

19 comment

  1. I do use this technique. Since you are running this from cron, the ssh-key you are using should probably be passwordless. In your .ssh/config on the the server you are going to backup use :
    http://ipython.scipy.org/moin/Documentation
    command=”/root/backupscript” ssh-rsa AAAAB…..

    Then “/root/backupscript” can be setup like this:
    # allow rsnapshot to backup /etc
    if [ “$SSH_ORIGINAL_COMMAND” = “rsync –server –sender -logDtprRx –numeric-ids . /etc” ]
    then
    eval $SSH_ORIGINAL_COMMAND
    exit 0
    fi
    echo no match $SSH_ORIGINAL_COMMAND >> /root/backupnomatch.log

    #If the rsync server sends a slightly different command, modify backed on what is in /root/backupnomatch.log

  2. Also, I use a script around rsnapshot that helps cut out a lot of my unneeded files from being backed-up. (Think cache files, or rapidly changing files like history in eclipse)

    In rsnapshot.conf I have “exclude_file /var/backups/snapshot/excludefile.txt”

    Then my script does a
    find /home/user1/ -xdev -name .nobackup -print0 | xargs -0 -n1 dirname > $EXCLUDEFILE
    cat /home/user1/.backupexcludes >> $EXCLUDEFILE

    So this first uses the hdup style .nobackup flag files to ignore whole directories. This works pretty well, except for directories that get deleted like firefox cache directories. Those I put in the .backupexcludes file.

    I do a similiar thing for the remote servers I backup.

  3. I’m doing a backup to an external usb drive who I mounted in fstab like this:

    /dev/sdc1 /media/usb_backup auto rw,user,auto 0 0

    I get an error that the disk is full when I do my second backup. It looks like rsnapshot thinks that the catalog where the partion is mounted is the messure of who big the backup can bee.The usb drive is 250 Gb and my main partion where I mount it is (root) is 39Gb.

    How do I solve this?

  4. Looks like it functions know. I just changed the line in fstab to:
    /dev/sdc1 /media/usb_backup auto rw,user,auto 0 0

    So the problem occured when I had noauto, like this:

    /dev/sdc1 /media/usb_backup auto rw,user,noauto 0 0

    Can that bee true, that the disk whasnt mounted at al becourse of that (trying to learn al about linux)?

    Thanks for your help!

  5. Ok, what if you configure your backup server as a raid5, how much different would this set up?

    Furthermore, i want to be able to mount an external tape drive to the back up server, so to store to tape the back up media.

    Thanks.

  6. When I run:

    rsnapshot hourly

    I still have to enter the root password on the remote server (WHM/cPanel).

    I checked and the remote server does have my public key and it is also authorized.

    Where in the local script can I try to force rsnapshot/rsync to use the ssh key? Maybe that’s the issue?

    I really hope someone can help thanks.

    After manually logging in the rsnapshot does work, so the only sticking point (for me) is to get the automated ssh key login to be used.

    Thanks for any help!

  7. Also, when I was connected, something happened in the transmission and my network card disconnected.

    Now whenever I run the:

    rsnapshot hourly

    command to test, I keep getting this error:

    ERROR: Could not write lockfile +"/var/run/rsnapshot.pid"

    There is no file by this name and I cannot find any online resource to fix this issue. So it seems there is a serious weakness in this – Meaning if the connection gets broken, they the system also breaks?

    Sorry, I’d appreciate anyone who knows how to fix this. :)

    THANK YOU!

  8. I believe Scott meant to say that:

    command=”/root/backupscript” ssh-rsa AAAAB…..

    should be added to ~/.ssh/authorized_keys instead of ~/.ssh/config. Anyone interested in using this method should also look into the PermitRootLogin forced-commands-only option in sshd_config.

  9. What I don’t understand is that I have the following backup jobs set up in rsnapshot configuration:

    backup [email protected]:/etc/ etc/
    backup [email protected]:/home/ home/
    backup [email protected]:/var/somedir/ somedir/

    why when I run the test run to see the commands which will be running is trying to CREATE a new directory EVERY TIME IT RUNS THE BACKUP JOB ?? #makesnosense

    echo 14526 > /var/run/rsnapshot.pid
    mkdir -m 0700 -p /var/backup/
    mkdir -m 0755 -p /var/backup/daily.0/
    /usr/bin/rsync -az –stats –delete –numeric-ids –relative \
    –delete-excluded –exclude-from=/home/user1/excludefile.conf \
    –rsh=/usr/bin/ssh [email protected]:/etc \
    /var/backup/daily.0/etc/
    mkdir -m 0755 -p /var/backup/daily.0/
    /usr/bin/rsync -az –stats –delete –numeric-ids –relative \
    –delete-excluded –exclude-from=/home/user1/excludefile.conf \
    –rsh=/usr/bin/ssh [email protected]:/home \
    /var/backup/daily.0/home/
    mkdir -m 0755 -p /var/backup/daily.0/
    /usr/bin/rsync -az –stats –delete –numeric-ids –relative \
    –delete-excluded –exclude-from=/home/user1/excludefile.conf \
    –rsh=/usr/bin/ssh \
    [email protected]:/var/abinitio \
    /var/backup/daily.0/abinitio/
    touch /var/backup/daily.0/

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