How do you test a large configuration?

[Skip Montanaro]

    >> To the greated extent possible, I'd like to avoid discovering
    >> mistakes in my configuration when a machine goes down and nobody
    >> notices.  Other than (actually, in addition to) tediously desk
    >> checking everything, do people have any suggestions for checking
    >> large configurations?

    Karl> Use iptables on the nagios box to block communication with various
    Karl> ports on various servers. Do this in a controlled manner and you
    Karl> should be able to test most of your configs.

Thanks for the excellent suggestion.  If only I had a Linux box available
for testing.  I'm currently running on Mac OS X and will probably port to
Solaris 8 for real deployment.  I'll have to see if I can scrounge up a PC
on which to install Linux.

Ooh, wait a minute.  I have Sun Ultra-10 sitting idle behind the firewall
(running Firewall-1) I manage.  I can just modify the firewall's policy to
do the same thing... ;-) That works because at the moment most of the
machines which will actually be monitored are still outside the firewall.

Again, thanks for the excellent suggestion.

-- 
Skip Montanaro
skip at pobox.com
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