Unnecessary host_name and for type loops/multiple check_commands?

[Kelly Jones]

Thanks to everyone who suggested nagios-- I have now started using
it... so here come the newbie questions...

I'm paranoid that someone will attack my DNS providers, so I want to
confirm my hostnames look up correctly. I wrote this command:

; this is different from check_dns
define command {
 command_name confirm_dns
 command_line check_dns $ARG1$ -s 63.226.12.96 -a $ARG2$
}

which confirms that a given hostname resolves to a given address using
the public DNS server 63.226.12.96.

Here's one service that checks this:

define service {
 use service-defaults ; just a bunch of trivial defaults
 service_description DNS-HOST1
 host_name localhost
 check_command confirm_dns!host1.mycompany.com!1.2.3.4
}

My questions:

% Is "host_name localhost" really necessary here? There's no reference
to $HOSTADDRESS$ anywhere in confirm_dns, but if I don't define
"host_name", nagios complains.

% I want to check about 20 hostnames.

 % Any shortcut to writing 20 6-line "service" definitions?
 % Can I use a for loop or something?
 % Use multiple check_command's in a single service (doesn't seem to to work)?

Of course, I can write a Perl one-liner or something to populate the
config file, but that seems kludgey. Having looping behavior in the
config file directly would be really useful for other reasons too.

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