Nagios Support Forum

Posted: **Wed Apr 24, 2013 1:17 pm**

I would recommend removing the "custom check_nrpe_1arg" command, and reading my previous post one more time.

I will give you an example that works, and then you can decide if you want to set up your system in similar way.

On the REMOTE machine I have:

In the "nrpe.cfg":

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command[check_users]=/usr/local/nagios/libexec/check_users $ARG1$
command[check_load_nrpe]=/usr/local/nagios/libexec/check_load $ARG1$

On my NAGIOS server, I have:

Command definition:

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command_line                             $USER1$/check_nrpe -H $HOSTADDRESS$ -t 30 -c $ARG1$ $ARG2$

Service definition:

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check_command			check_nrpe!check_users!-a '-w 3 -c 5'

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check_command			check_nrpe!check_load_nrpe!-a '-w 15,10,5 -c 30,20,10'

Running checks from the command line on my Nagios server:

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./check_nrpe -H <client_IP> -c check_users -a '-w 3 -c 5'
USERS OK - 1 users currently logged in |users=1;3;5;0

./check_nrpe -H <client_IP> -c check_load_nrpe -a '-w 15,10,5 -c 30,20,10'
OK - load average: 0.32, 0.63, 0.63|load1=0.320;15.000;30.000;0; load5=0.630;10.000;20.000;0; load15=0.630;5.000;10.000;0;

Posted: **Tue May 07, 2013 4:31 pm**

Hey lmiltchev, thanks for the input and sorry for such a delayed response. It's taken awhile to test everything thoroughly. I can definitely query things through the command line on the monitoring host with your set-up (which I happen to find preferable, notably keeping the arguments centrally located.)

However, I am still unable to retrieve information from the GUI. Status information reports '(No output returned from plugin)' from CPU Load (yet I have another service working but it has no arguments). Things are currently configured like this:

Monitoring Host

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define service{
use  generic-service
host_name mortall
service_description CPU Load NRPE
check command check_nrpe!check_load!-a '-w 15,10,5 -c 30,20,10'
}

Remote Host, I've tried the following combinations

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command[check_load_nrpe]=/usr/lib/nagios/plugins/check_load $ARG1$ 
command[check_load_nrpe]=/usr/lib/nagios/plugins/check_load $ARG1$ $ARG1$
command[check_load_nrpe]=/usr/lib/nagios/plugins/check_load -w $ARG1$ -c $ARG1$

However, I also have, on the monitoring host, defined: check_command check_nrpe!check_apt!-a
Which, incidentally, reports just fine. Which indicates to me an argument issue.

The GUI does make this note:

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Note:
This plugin requires that you have the NRPE daemon running on the remote host.
You must also have configured the daemon to associate a specific plugin command
with the [command] option you are specifying here. Upon receipt of the
[command] argument, the NRPE daemon will run the appropriate plugin command and
send the plugin output and return code back to *this* plugin. This allows you
to execute plugins on remote hosts and 'fake' the results to make Nagios think
the plugin is being run locally.

I was considering putting a '-c [command-name]' somewhere, but it's a bit confusing as to where. The exclamation mark delimiters, I thought, covered this.

One other error that keeps popping up when I try to use the GUI:

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Error: Could not stat() command file '/var/lib/nagios3/rw/nagios.cmd'!
The external command file may be missing, Nagios may not be running, and/or Nagios may not be checking external commands.
An error occurred while attempting to commit your command for processing.

Posted: **Wed May 08, 2013 3:27 am**

Hi jiggityjog,

You have in the service definition;

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check command check_nrpe!check_load!-a '-w 15,10,5 -c 30,20,10'

But your Remote host nrpe.cfg has;

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command[check_load_nrpe]=/usr/lib/nagios/plugins/check_load $ARG1$

You should have in your service definition;

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check_command check_nrpe!check_load_nrpe!-a '-w 15,10,5 -c 30,20,10'

You didn't use "check_load_nrpe". Also, you missed out the "_" between check and command.

You should try a straight copy and paste into your .cfgs what lmiltchev posted and only change the plugin locations (e.g. /usr/lib/...).

Kind Regards,

Gary Shergill

Posted: **Wed May 08, 2013 10:00 am**

Hey gshergill,

I made a mistake while typing, sorry. Since these servers are on virtual machines I find it easier to just type out my config settings.
However since I keep bungling that up, I just ssh'd over, so here is exactly what I have (which, incidentally, seems like what you suggested, and might demonstrate how I got my wires crossed):

on nrpe.cfg

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command[check_load]=/usr/lib/nagios/plugins/check_load $ARG1$
command[check_load_nrpe]=/usr/lib/nagios/plugins/check_load $ARG1$
command[check_apt]=/usr/lib/nagios/plugins/check_apt

on services.cfg

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define service{
	use	generic-service
	host_name	mortalla
	service_description	CPU Load
	check_command	check_nrpe!check_load!-a '-w 15,10,5 -c 30,20,10'
}

define service{
	use	generic-service
	host_name	mortalla
	service_description	CPU Load NRPE
	check_command	check_nrpe!check_load_nrpe!-a '-w 15,10,5 -c 30,20,10'
}

define service{
	use	generic-service
	host_name	mortalla
	service_description	apt
	check_command	check_nrpe!check_apt!-a
}

lmiltchev's server commands work great, but the website interface won't comply ((No output returned from plugin)).

It's weird because I remember even managing things, like a simple restart of nagios (System > Process info), being super simple before where now I get the error I mentioned earlier. (I've changed check_external_commands to 1) Actually one problem now is that these services seem to be in a HARD state and nagios no longer does checks when I alter the commands (even after service nagios-nrpe-server reload/restart, service nagios3 reload/restart).

UPDATE: I solved the external command issue using this page: http://technosophos.com/content/nagios- ... ile-debian
Though I had to apply chmod recursively to the /nagios3/rw directory. I ended up looking through the permissions on the plugins (monitoring and remote host), noticed they were all default (for ubuntu server anyway). So I tried chowning them to nagios:www-data, then recursively doing a chmod g+x. Still no luck.

Posted: **Wed May 08, 2013 1:22 pm**

Did you restart xinetd after you modified the nrpe.cfg?

What kind of output are you getting, when you cd into the plugins directory on your nagios server and run the following commands?

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./check_nrpe -H <client_IP> -t 30 -c check_load -a '-w 15,10,5 -c 30,20,10'
./check_nrpe -H <client_IP> -t 30 -c check_load_nrpe -a '-w 15,10,5 -c 30,20,10'

Posted: **Wed May 08, 2013 2:20 pm**

I actually don't even bother with xinetd...

I've uploaded a screenshot of my output.

Posted: **Wed May 08, 2013 3:53 pm**

So, you get this output when you run the checks from the command line, but you have errors in the GUI?

Posted: **Wed May 08, 2013 4:41 pm**

Yes, here's a screenshot:

Posted: **Wed May 08, 2013 5:02 pm**

Try to run the same commands as nagios user (not as root) from the command line, and post the output. Also, show the permissions of the check_nrpe:

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ls -la /usr/lib/nagios/plugins/check_nrpe

Posted: **Wed May 08, 2013 5:40 pm**

I'm not exactly sure what you mean by run check_nrpe as the nagios user. I tried changing the password for nagios, then logging in. That didn't really work...

Something about the check_nrpe command looks wrong, but I'm beat and my day's over so I'll be back on this tomorrow.
UPDATE: missed the -c. doh!

thanks for the assistance!

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