Hello.

I wanted to know, what is the most automaton-friendly by default system you know, and why is it, for you, the best on that?

What I mean is, take an OS, install it without changing more than strictly required to get it working.
It could already be ready to automate a lot, for example already running cfengine, chef, puppet, or alike and have it's configuration already done in templates, or it should be damn easy to get it to that point, I don't know.

If you know such a system, which one would it be?