I have virtual machine with Linux (Ubuntu server) which is used as prototype for other machines. Sometimes I make changes in prototype system and want to import this changes at some other machine.

I know about Puppet, cfengine and FAI but want something easy for example rsync script which will work through ssh when it needed.

Main goal is /etc/ directory. But I don't want to syncronize some private files for example /etc/passwd /etc/shadow and so on. I don't know all of it.

Are there tips for my task ? May be someone have such rsync script.