Capturing perf data from check_snmp

[James Whittington]

Thank you Scott and Erwin for your input.

Erwin was right, I had seen the information on developing plugins and
what it said about return codes previously.
I thought since I was using an existing plugin and just adding to the
output the return codes would be in tact. The return codes from the
plugin were getting trapped in the perl wrapper.

I still don't know how to catch a return code from the plugin, but by
doing some string comparisons on the plugin output I can generate a
return code from the perl wrapper.

Thanks again for your help, you input made me a happy guy when this
stuff started working around midnight :<).
 

James Whittington



-----Original Message-----
From: nagios-users-admin at lists.sourceforge.net
[mailto:nagios-users-admin at lists.sourceforge.net] On Behalf Of
Erwin.Mascardo at intelsat.com
Sent: Thursday, April 14, 2005 4:05 PM
To: nagios-users at lists.sourceforge.net
Subject: RE: [Nagios-users] Capturing perf data from check_snmp

You're both working too hard here by trying to parse the output from the
snmpget command. Keep reading...

>-----Original Message-----
>From: scott_yem at agilent.com [mailto:scott_yem at agilent.com] 
>Sent: Thursday, 14 April, 2005 12:56
>To: nagios-users at lists.sourceforge.net
>Subject: RE: [Nagios-users] Capturing perf data from check_snmp


>You may need to check the output you get with the snmpget command.  I
had a
similar thing working on an older
>version and when I upgraded I had to track that down.  I found the
output
from the snmpget command changed and I had
>to incorporate that into my logic.
 
>Scott Yem



>>From: nagios-users-admin at lists.sourceforge.net
[mailto:nagios-users-admin at lists.sourceforge.net] On Behalf Of James
Whittington
>>Sent: Thursday, April 14, 2005 9:50 AM
>>To: nagios-users at lists.sourceforge.net
>>Subject: [Nagios-users] Capturing perf data from check_snmp
 
>>I'm using Nagios version 1.3 with Plugins version 1.4-2 on a debian
sarge
system.
>>I am using perfparse to capture performance data to mysql.
>>I am trying to capture an rfinput value of a wireless device through
the
check_snmp plugin and write it to a mysql
>>db for reporting.
 
>>Since check_snmp does not currently write performance data in the
output I
was trying to write a simple perl script
>>to use check_snmp but add the performance data to the output.
>>To make a long story short my simple perl script is adding performance
data to the output and perfparse is picking
>>it up, but I noticed that the service status in Nagios is always "OK"
even
when the Status Information says
>>otherwise.

<snip screen snap> 
 
>>Here's how it looks through check_snmp
>>./check_snmp -H10.0.10.12
-oSNMPv2-SMI::enterprises.2378.1.1.2.1.2.80.1.1.3.5 -w 22:50
>>SNMP WARNING - *51*

What you're not seeing here is the return code from check_snmp. It's
returning a value of 1, which corresponds to WARNING.
 
>>Here's the modified output from the perl script that triggers perfdata
but
kills status funtionallity in Nagios.  
>>./check_rfinput3 -H10.0.10.12
>>SNMP WARNING - *54* neg-dbm|rf-input=54
 
>>Here's the very very basic script that did the damage.
>>/usr/lib/nagios/plugins# more check_rfinput3
>>#!/usr/bin/perl
>>if ($ARGV[0] eq "") {
>>       print "Hostaddress required\n";
>>        print "ie.. script.pl 123.123.123.123\n";
>>}else{
>>        $HOSTADDRESS = $ARGV[0];
>>        $HOSTADDRESS =~ s/-H//;
>>$RFINPUT = `/usr/lib/nagios/plugins/check_snmp -H$HOSTADDRESS
-oSNMPv2-SMI::enterprises.2378.1.1.2.1.2.80.1.1.3.5 -w 22:48 -c 20:55 -u
neg-dbm`;
>>$RFRAW = $RFINPUT;
>>$RFRAW =~s/[^0-9]//g;
>>chomp($RFINPUT);
>>print "$RFINPUT|rf-input=$RFRAW";
>>}

You need to grab the return value from check_snmp. It will be 0, 1, 2,
or 3.
The wrapper script needs to return the same value in order to have
Nagios
process it.

>>I even tried to modify the check_snmp source code which fixed the
status
info but did not get me perfdata for some
>>reason.
>>./nagios-plugins-1.4/plugins/check_snmp -H10.0.10.12  -oSNMPv2-SMI::
enterprises.2378.1.1.2.1.2.80.1.1.3.5 -w 22:60
 54
>>SNMP OK - 54|SNMP= 54
 
>>The output from the perl wrapper looks pretty much the same and the
output
from plugins that have perf data built
>>in to them so I am at a loss as to why it doesn't work.
>>I'm not a not a perl of nagios guru yet, so I figured I would through
this
out to the list to see how other folks
>>many have solved this problem already.

Read up on how to write custom plugins:
http://nagiosplug.sourceforge.net/developer-guidelines.html
 
>>Thanks for any guidance you all may provide.
 

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