check snmp logic

[Ben Sykes]

        Do you mean you want to check the result of one OID and make that treat
another OID's values differently?

Personally if I faced that problem - I would probably code a custom check
in Bash using snmpget from snmputils that did some nested If statements, or
use Net::SNMP from Perl and check it that way. Quite simple to write a
Nagios plugin - it's all about the exit values - 0 is OK, 1 is Warning, 2
is Critical, 3 is Unknown.

You may be able to use warning states generated by the first to define a
dependency on the second but it will be complicated to change the
thresholds dynamically via that method, at best you'd be able to suppress a
warning or other state from the 2nd but you couldn't have differential
thresholds between the two states of the first service without some work or
hackery (e.g. having an event trigger fire off that changes the
configuration file and reloads nagios)

I would just code it into a plugin (assuming you or someone on your team
can code)


Something like this perl pseudo code...

use Net::SNMP;

$snmp = Net::SNMP->session(-hostname => $ipaddress, -community => "public",
-version => 'snmpv2c');

@oids = qw/1.2.3.4 1.2.3.5/;

$res = $snmp->get_request(-varbindlist => \@oids);
unless(defined($res))
{
   print "UNKNOWN - no response\n";
   exit(3);
}

$firstoidval = $res->{$oids[0]};
$secondoidval = $res->{$oids[1]};

if ($firstoidval == 1)  #running?
{
   if ($secondoidval > 50) { print "CRITICAL - running and temp above
critical threshold"; exit(2); }
   if ($secondoidval > 45) { print "WARNING"; exit(1); }
   else { print "OK"; exit(0): }
}
elsif ($firstoidval == 0)  #notrunning?
{
   if ($secondoidval > 40) { print "CRITICAL"; exit(2); }
   if ($secondoidval > 35) { print "WARNING"; exit(1); }
   else { print "OK"; exit(0): }
}


Logic probably differs a bit, but you get the gist...


Cheers

Ben



        ben sykes
consultant

m. +61 404 308 201
e. ben.sykes at transpire.com.auimage:
On Thu, Aug 29, 2013 at 11:27 AM, Mark Campbell <mcc171 at psu.edu> wrote:

> So I need to utilize some logic in my service checks.
>
> I have a chiller that if it is not running the discharge temp is not of
> concern.  However if it is running the discharge temp needs to be lower
> than 50 degrees.
>
> Is there a way to have the check snmp utilize some logic that says if
> running = 0 then ignore discharge temp.  If running = 1 then discharge
> temp must be <50 degrees?
>
> THe other option I thought of was using dependencies.  Anyone have
> suggestions on that?
>
>
>
>
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