I need to have a certain directory synchronized across multiple linux machines, so that changes on one machine are either pushed to the other copies or easily polled. I'm ok with having one master and the others as slave.
I thought about rsync, heard about unison, and I am sure there are other tools, but I've never tried using any for syncing more than two machines.
I'm looking for something that is super easy to install and configure.
I'm also looking to stay behind our firewall, without using third-party sites.