Rsnapshot - Rsync based utility to take backup - Introduction
Rsnapshot is an rsync based untility in Linux and Unix which is used to backup your remote and local files. Rsnapshot uses rsync and hard links to take full and incremental backup of your Linux machine. Remote backup is possible by using rsync over ssh. However, for remote backup with Windows you have install application on Windows to act as Rsync on Windows. Rsnapshot is a free software under GPL terms and can run on almost all UNIX based system. Rsnapshot uses only configured number of snapshots, so that the disk space won't grow after the certain limit is reached. Rsnapshot also reduces the disk space required for backup as rsnapshot uses hard links extensively.
Also see tutorial Rsync exclude directory example to exclude files and directories while executing the backup task with rsync.
The following installation is performed on CentOS 7. There will be a little difference in installing and configuring rsnapshot on other distribution of Linux and UNIX.
You can either install rsnapshot directly on your system or you can download the archive file from the net, extract it and then install it. In this tutorial you will see both way of installing rsnapshot.
Installing rsnapshot directly
The below command will install rsnapshot directly on the system.
# yum -y install rsnapshot
Change the directory to opt and download rsnapshot. See the below example.
# cd /etc/opt
# wget http://rsnapshot.org/downloads/rsnapshot-1.2.3.tar.gz
# tar xvfz rsnapshot-1.2.3.tar.gz
# cd rsnapshot-1.2.3
# ./configure –sysconfdir=/etc
checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for a thread-safe mkdir -p... /usr/bin/mkdir -p checking for gawk... gawk checking whether make sets $(MAKE)... yes checking whether make sets $(MAKE)... (cached) yes checking for perl... /usr/bin/perl checking for rsync... /usr/bin/rsync checking for cp... /usr/bin/cp checking for rm... /usr/bin/rm checking for ssh... /usr/bin/ssh checking for lvcreate... /usr/sbin/lvcreate checking for lvremove... /usr/sbin/lvremove checking for mount... /usr/bin/mount checking for umount... /usr/bin/umount checking for logger... /usr/bin/logger checking for du... /usr/bin/du configure: creating ./config.status config.status: creating Makefile config.status: creating rsnapshot config.status: creating rsnapshot-diff config.status: creating rsnapshot.conf.default config.status: creating t/link-dest_-t_when_only_one_snapshot/link-dest_-t_when_only_one_snapshot.t config.status: creating t/link-dest_-t_when_only_one_snapshot/conf/link-dest_-t_when_only_one_snapshot.conf config.status: creating t/relative_delete_bugfix/relative_delete_bugfix.t config.status: creating t/relative_delete_bugfix/conf/relative_delete_bugfix.conf config.status: creating t/snapshot_root_with_space/snapshot_root_with_space.t config.status: creating t/snapshot_root_with_space/conf/snapshot_root_with_space.conf config.status: creating t/cmd-post_pre-exec/cmd-post_pre-exec.t config.status: creating t/cmd-post_pre-exec/conf/pre-false-post-true.conf config.status: creating t/cmd-post_pre-exec/conf/pre-true-post-true.conf config.status: creating t/cmd-post_pre-exec/conf/pre-true-post-false.conf config.status: creating t/cmd-post_pre-exec/conf/pre-false-post-false.conf config.status: creating t/SysWrap.pm config.status: creating t/backup_exec/conf/backup_exec_fail.conf config.status: creating t/backup_exec/conf/backup_exec.conf config.status: creating t/backup_exec/backup_exec.t config.status: creating t/rsync-exitcode/rsync-exitcode.t config.status: creating t/rsync-exitcode/conf/rsync-exitcode-good.conf config.status: creating t/rsync-exitcode/conf/rsync-exitcode-bad.conf config.status: creating t/configtest/configtest.t config.status: creating t/configtest/conf/configtest.conf config.status: creating t/rsync/rsync.t config.status: creating t/rsync/conf/rsync.conf config.status: creating t/gnu_cp/gnu_cp.t config.status: creating t/gnu_cp/conf/gnu_cp.conf config.status: creating t/ssh_args/conf/ssh_args.conf config.status: creating t/ssh_args/ssh_args.t
# make install
Copy your rsnapshot.conf.default file. If default file is not exist, create a file and name it 'rsnapshot.conf.default' and copy your rsnapshot.conf file to default.
I am considering here that rsnapshot default file exist in your system. Now execute the below command.
# cp /etc/rsnapshot.conf.default /etc/rsnapshot.conf
To use rsnapshot you need to edit the configuration file. Open 'rsnapshot.conf' file and uncomment the following lines.
# vi /etc/rsnapshot.conf
cmd_cp /usr/bin/cp cmd_rsync /usr/bin/rsync cmd_ssh /usr/bin/ssh cmd_logger /usr/bin/logger cmd_du /usr/bin/du interval logfile /var/log/rsnapshot
Functionality of the above uncommented lines.
It makes recursive copies of directories. It must be enabled. If you are using it on Linux uncomment it, however if you are using it in IRIX, Solaries, BSD or some other UNIX system, you should leave the line commented out.
This line must be commented out for the program to work.
If ssh is installed and enabled in your system, uncomment this line to take remote ssh backup over rsync. But if you have a plan to take backup of your localsystem, then leave this line commented out.
Uncomment this line to enable syslog support in rsnapshot.
Uncommenting this line makes rsnapshot enabled to generate actual reports of disk usage with the help of DU tool.
Uncomment this line to specify how you plan to take your backups, hourly, daily, weekly or monthly. You can uncomment the line top specify the interval according to your needs.
By uncommenting it you will enable the file to write log data to it. Rsnapshot will use the specified file to write its log data.
Configure Backup path
Assign source backup directory and destination backup. By default there is already a backup script. You can change the source path of the backup according to your needs. However all your backup will be stored in a directory /.snapshots. you can edit where you want to take your backup by editting the following line.
# vi /etc/rsnapshot.conf
Change the source directory which you want to take backup by editing following line.
# vi /etc/rsnapshot.conf
backup /etc/ localhost/
# rsnapshot configtest Syntax OK
Verify rsnapshot backup configuration
You can configure backup intervals in rsnapshot by uncommenting intervals in 'rsnapshot.conf' file. The intervals are hourly, daily, weekly and monthly. Verify the configuration by using the following command.
Verify hourly backup configuration
# rsnapshot -t hourly echo 19367 > /var/run/rsnapshot.pid /usr/bin/cp -al /.snapshots/hourly.0 /.snapshots/hourly.1 /usr/bin/rsync -a --delete --numeric-ids --relative --delete-excluded \ /root/Maildir/ /.snapshots/hourly.0/backup_maildir/ touch /.snapshots/hourly.0/
Verify daily backup configuration
# rsnapshot -t daily echo 19379 > /var/run/rsnapshot.pid /.snapshots/hourly.5 not present (yet), nothing to copy
Verify weekly backup configuration
# rsnapshot -t weekly echo 19391 > /var/run/rsnapshot.pid /.snapshots/daily.6 not present (yet), nothing to copy
Verify monthly backup configuration
By default monthly interval is disabled. So you will get the error.
# rsnapshot -t monthly echo 19479 > /var/run/rsnapshot.pid ---------------------------------------------------------------------------- rsnapshot encountered an error! The program was invoked with these options: /usr/local/bin/rsnapshot -t monthly ---------------------------------------------------------------------------- ERROR: Interval "monthly" unknown, check /etc/rsnapshot.conf
Verify rsnapshot job
By default the backup taken by rsnapshot is stored in the directory /.snapshots. Before automating the task you can check it manually if rsnapshot is working or not. Run the below command.
# /usr/local/bin/rsnapshot hourly
Now check the directory for backups. It should so the below output.
# ls -al /.snapshots/ total 4 drwxr-xr-x 3 root root 4096 Sep 12 02:54 hourly.0
Automate the task
You can automate the task by making the cron job entry into crontab. See the below example.
# crontab -e
0 */6 * * * /usr/local/bin/rsnapshot hourly 10 02 * * * /usr/local/bin/rsnapshot daily 05 03 * * * /usr/local/bin/rsnapshot weekly
To confirm your crontab is set properly, type the below command. It will show the list of crontab process running on your computer.
Also see how to use : crontab & simple cron job for Linux admin
# crontab -l
For more detail and options with rsnapshot, see the man page of rsnapshot.
# man rsnapshot
This is it with the tutorial Rsnapshot-Rsync based tutorial to take backups. See Rsync exclude-from tutorial to exclude folders and files while taking backup.
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