I'm trying to work out an easier way to keep a bunch of Linux boxes up to date. Roughly 10-15. Mostly Debian, but a couple of others too. Currently, most are done with ClusterSSH, and the remaining ones are done individually. I think what I want is something that can list which machines need updating, and let me push a button to say to do it... Is there something (free & open) like that? I did start trying to get my head around puppet, but it seemed like overkill for this task. Am I wrong in thinking that?