DNS check - please help

[James Pratt]

The help for the plugin says -

./check_dns --help

check_dns v1.4.15 (nagios-plugins 1.4.15)
Copyright (c) 1999 Ethan Galstad <nagios at nagios.org>
Copyright (c) 2000-2008 Nagios Plugin Development Team
        <nagiosplug-devel at lists.sourceforge.net>

This plugin uses the nslookup program to obtain the IP address for the given host/domain query.
An optional DNS server to use may be specified.
If no DNS server is specified, the default server(s) specified in /etc/resolv.conf will be used.


(Based on your stated result(s), I must assume that if the "specified server" fails, it probably defaults to /etc/resolv.conf, but I'd probably have to fire up wireshark/tshark to find out for sure)...

Cheers,
James

From: Nibin V M [mailto:nibin.vm at piserve.com]
Sent: Monday, July 18, 2011 10:55 AM
To: Nagios Users List
Subject: [Nagios-users] DNS check - please help

Hello,

I am a bit lost to find how the check_dns works. Please see the results below.

# ./check_dns -H google.com<http://google.com> --server=myserver.
DNS OK: 0.011 seconds response time. google.com<http://google.com> returns 74.125.93.103,74.125.93.104,74.125.93.105,74.125.93.106,74.125.93.147,74.125.93.99|time=0.011378s;;;0.000000

# dig +short google.com<http://google.com> @myserver
#

I am sure that recursion isn't enabled on "myserver". Do the plugin try to resolve google.com<http://google.com> using the name servers specified resolv.conf, if the -s server doesn't provide any answer?

Thanks in advance.

Regards,
Nibin.
---------------------------------
Nibin.V.M
Systems Integrator
PiServe.com

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