I'm working with a cluster of Linux servers sitting behind the Amazon cloud autoscaling feature (documentation). There are files that accumulate on each server, they are cache files for the application. I am searching for an automated way to have the servers sync that folder amongst themselves.Rsync would work if someone had a clever way to do peer detection.Same goes for Unison.We have also considered using a SaaS such as Dropbox.Gluster seems like overkill, and I'm not sure how easy it is to have a new computer auto-join the cluster.Ideally what would happen is when a new server is launched, it discovers it's peers and begins syncing the folder.  From that point on it's a latest filestamp wins P2P synchronization.Anything out there that does this?
Directory sync with automatic peer discovery
linux;rsync;cluster