File Synchronization Between Two Ubuntu Servers using Unison

Unison is a file-synchronization tool for Unix and Windows. It allows two replicas of a collection of files and directories to be stored on different hosts (or different disks on the same host), modified separately, and then brought up to date by propagating the changes in each replica to the other.

This tutorial shows how to set up file synchronization between two Ubuntu 12.04 servers with Unison that are on the same network but you can use the same approach on the servers that are not placed on the same network.

Before installing the unison,generate the ssh key pair on PrimarySrv and copy the public key to the SecondarySrv:

ssh-keygen
scp ~/.ssh/id_rsa.pub arbab@192.168.1.203: