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RSYNC


RSYNC 

is one of the most popular File Copying/Synchronizing service among Linux people. Its synchronizing while copping and consume Less network resources for its operations.

CAUTION!!!! Miss use may cause original data overwrite or deletion.

As an example, here in iPhonik (iPhonik was formed as a company in the business of developing an Unified Communication Solution product and related services.) we use rsync to take realtime backups and duplicate them on the redundant servers. Call recording which stores in the real-time server will be synchronized/ copied to the redundant server (We are using NFS as the file sharing mechanism share-directory-between-two-server-nfs ).

 How to USE

Most of the time your Linux distributions comes with the installed rsync service but if you don’t have installed rsync on your Linux distribution,

Debian distributions
apt-get install rsync 
RedHat distributions

yum install rsync

Now if you wish to use rsync with the remote host

rsync -avz -e ssh remotepeers@remotedomain:/remotepeers/dirA/dirB/ /local-this-user/dirE/dirF

If you wish to use rsync through server

First you have to setup rsync as a daemon process, to do that find the /etc/xinetd.con file and add following lines below the very last line of the file,

rsync stream tcp nowait root /usr/bin/rsync rsync –daemon

Let’s create the rsync configuration file as “/etc/rsyncd.conf”
And add following configuration,

max connections = 1
log file = /var/log/rsync.log
timeout = 300
[usersfiles]
comment = Rsync user’s cache
path = /usr/local/usersfiles
read only = no
list = yes
uid = nobody
gid = nogroup
#auth users = user
list = yes
hosts allow = 127.0.0.0/8 192.168.1.0/24 secrets file = /etc/rsyncd.sec
Save and Exit

By commenting very last two line will allow anonymous access.

Afterward let’s create the /etc/rsyncd.sec file and add user name and passwords for the allowed users (if you didn’t allow anonymous access).

To start the syncronisation,
rsync -avz rsync://your_ip-addresses_or_domain/public
Click here for rsync manual (Man page).
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