How to use rsync

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So what is unique about rsync?

It can perform differential uploads and downloads (synchronization) of files across the network, transferring only data that has changed. The rsync remote-update protocol allows rsync to transfer just the differences between two sets of files across the network connection.

 

How do I install rsync?

Use any one of the following commands to install rsync.

If you are using Debian or Ubuntu Linux, type the following command

# apt-get install rsync
OR
$ sudo apt-get install rsync

If you are using Red Hat Enterprise Linux (RHEL), type the following command

# up2date rsync

If you are using CentOS/Fedora Core Linux, type the following command

# yum install rsync

Always use rsync over ssh

Since rsync does not provide any security while transferring data it is recommended that you use rsync over ssh . This allows a secure remote connection. Now let us see some examples of rsync.

rsync command common options

  • –delete : delete files that don’t exist on sender (system)
  • -v : Verbose (try -vv for more detailed information)
  • -e “ssh options” : specify the ssh as remote shell
  • -a : archive mode
  • -r : recurse into directories
  • -z : compress file data

Task : Copy file from a local computer to a remote server

Copy file from /www/backup.tar.gz to a remote server called unixmen.net
$ rsync -v -e ssh /www/backup.tar.gz jerry@openbsd.nixcraft.in:~Output:

Password:
sent 19099 bytes received 36 bytes 1093.43 bytes/sec
total size is 19014 speedup is 0.99

Please note that symbol ~ indicate the users home directory (/home/jerry).

Task : Copy file from a remote server to a local computer

Copy file /home/jerry/webroot.txt from a remote server unixmen.net to a local computer /tmp directory:
$ rsync -v -e ssh jerry@unixmen.net:~/webroot.txt /tmp
Password

Task: Synchronize a local directory with a remote directory

$ rsync -r -a -v -e “ssh -l jerry” –delete unximen.net:/webroot/ /local/webroot

Task: Synchronize a remote directory with a local directory

$ rsync -r -a -v -e “ssh -l jerry” –delete /local/webroot unixmen.net:/webroot

Task: Synchronize a local directory with a remote rsync server

$ rsync -r -a -v –delete rsync://rsync.unixmen.net/cvs /home/cvs

Task: Mirror a directory between my “old” and “new” web server/ftp

You can mirror a directory between my “old” (my.old.server.com) and “new” web server with the command (assuming that ssh keys are set for password less authentication)
$ rsync -zavrR –delete –links –rsh=”ssh -l vivek” my.old.server.com:/home/lighttpd /home/lighttpd

rsync for Windows server/XP

Please note if you are using Windows, try any one of the program:

  1. DeltaCopy
  2. NasBackup

Source: cyberciti

For questions please refer to our Q/A forum at : http://ask.unixmen.com/

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