Capturing perf data from check_snmp

[Erwin.Mascardo at intelsat.com]

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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