phantom host up messages

[Marc Powell]

> -----Original Message-----
> From: nagios-users-admin at lists.sourceforge.net [mailto:nagios-users-
> admin at lists.sourceforge.net] On Behalf Of Mike Linden
> Sent: Thursday, March 16, 2006 8:08 AM
> To: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] phantom host up messages
> 
> Hi,
> I have a couple systems that have been unplugged and removed from the
rack
> ,yet Nagios still reports a Host UP alert for them from the check_ping
> process.
> How is this possible?
> 
> ***** Nagios  *****
> 
> Notification Type: RECOVERY
> Host: csep1039
> State: UP
> Address: csep1039
> Info: (No output!)
> 
> Date/Time: Thu Mar 16 08:56:42 EST 2006

The plugin/command you are using to check the host is providing no
command line output but is still exiting with a code of 0 (successful).
Try running the check_command, as the nagios user, exactly as it's
defined, from the command line and then 'echo $?'. The results of the
echo for a down host should be '2'. Chances are you're going to see some
additional error output from ping/check_ping.

There was also a suggestion earlier for another issue to add '2>&1' to
the end of the check_command definition to redirect error output back to
Nagios. If that works as advertised, and I believe it will, that could
be informative as well.

--
Marc


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