I’m now trying to upgrade/relocate servers (web, mail, etc..) of our lab, and finished to wake two servers up and relocate the web and mail. So, the next is the DNS, account servers, etc.
And,,, i’ve found many (,, so, so many) bugs and problems on old configuration files during my work.

What do you think the best way to watch the servers?
Nagios like mozilla.org? Hinemos from Japanese IT? or, simply with munin??