check_http negative matching

[Marc Powell]

On Dec 16, 2008, at 9:57 AM, Sean Carolan wrote:

> I have a particular web page that I would like to monitor for the word
> "ERROR".  It should be a negative match, so that if the word is found
> an alert is sent.  The normal behavior of his monitor is to alert if
> the search string is not found.  How do I reverse this?

With the negate plugin.

$ ./negate --help
negate v1859 (nagios-plugins 1.4.11)
Copyright (c) 2002-2007 Nagios Plugin Development Team
	<nagiosplug-devel at lists.sourceforge.net>

Negates the status of a plugin (returns OK for CRITICAL and vice-versa).
Additional switches can be used to control which state becomes what.


Usage:negate [-t timeout] [-owcu STATE] <definition of wrapped plugin>

Options:
[chopped]

Examples:
  negate /usr/local/nagios/libexec/check_ping -H host
     Run check_ping and invert result. Must use full path to plugin
  negate -w OK -c UNKNOWN /usr/local/nagios/libexec/check_procs -a 'vi  
negate.c'
     This will return OK instead of WARNING and UNKNOWN instead of  
CRITICAL

Notes:
This plugin is a wrapper to take the output of another plugin and  
invert it.
The full path of the plugin must be provided.
If the wrapped plugin returns OK, the wrapper will return CRITICAL.
If the wrapped plugin returns CRITICAL, the wrapper will return OK.
Otherwise, the output state of the wrapped plugin is unchanged.


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