NRPE: Command 'check_disk' not defined

[Jonathan Murray]

Interesting. I'm still not getting it, or I'm doing something 
incorrectly. I have other commands set up the same way, and they work:

for example,

on nagios "engine"

in checkcommands.cfg:

# 'check_disk_c1'
define command{
         command_name    check_disk_c1
         command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c 
check_disk_c1
         }

in services.cfg:

define service{
	use				generic-service		; Name of service template to use
	host_name			varuna
	service_description		Check /raid/c1 space
	retry_check_interval		2
	contact_groups			linux-admin
	notification_options		w,c,r
	check_command			check_disk_c1
	}

on machine I am trying to monitor, in /usr/local/nagios/etc/nrpe.cfg:

command[check_disk_c1]=/usr/local/nagios/libexec/check_disk -w 20 -c 10 
-p /raid
/c1

On the web interface, in the status column I see the following:
varuna Check /raid/c1 space
OK 	05-31-2007 12:21:11 	2d 5h 56m 0s 	1/3 	DISK OK - free space: 
/raid/c1 114527 MB (16% inode=99%):

So in this case, which is the same as the earlier description, it works. 
   Here the machine being monitored is a debian system, but I didn't 
think that would make such a difference.

I have also set up the command as you specified, or how I interpreted 
what you specified, I hope I was accurate here:

Nagios "engine"
in services.cfg:

define service{
	use				generic-service		; Name of service template to use
	host_name			paleo
	service_description		check disk sda5
	retry_check_interval		2
	contact_groups			linux-admin
	notification_options		w,u,c,r
	check_command			check_nrpe!check_disk_sda5!20%!10%!/
	}

In the above, I don't know what that / is doing after the !, but it was 
in your mail, so I thought it was needed.

in checkcommands.cfg:

  'check_disk_sda5'
define command{
	command_name    check_disk_sda5
         command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c 
check_disk_sda5
         }

On the machine I am trying to get information on the disk sda5,
command[check_disk_sda5]=/usr/local/nagios/libexec/check_disk -w 20 -c 
10 -p /dev/sda5

It would seem here that on the machine being monitored, the command 
"check_disk_sda5" would use the local plugin 
/usr/local/nagios/libexec/check_disk with the options:
-w 20 -c 10 -p /dev/sda5

run locally, this is indeed what it seems to do. However, the server 
doesn't seem to use the command I have placed in the nrpe.cfg file.

On the web interface, this returns, in the "Status" column:

NRPE v2.7.1

What do you use for your entries in you checkcommands.cfg for your 
commands? I was under the impression that I had to define the commands 
there and nagios would use them.

Perhaps these questions are getting too basic?

Thanks,

Jonathan
Sebastian Ganame wrote:
> Hi John,
>      Your problem is that you're trying to invoke a service that is not 
> local, thus it shouldn be defined not only in your Nagios server 
> configuration files, but also in the nrpe.cfg file used when the nrpe 
> daemon starts on the target machine.
>      I'll try to explain just a little bit what I did since I suffered 
> the same situation:
>  
>      1) Define a new service in Nagios Engine for monitoring non-local 
> disks, as follows:
>  
> define service{
>     use                           local-service ;Name of service 
> template to use
>     host_name                /[the servers in which you have nrpe 
> installed]/
> /    /service_description     Remote check disk
>     check_command        check_nrpe!check_hda1!20%!10%!/
> }
>      2) I used check_hda1 instead of check_disk to identify the way I 
> use this in the target machines. Then you need to include this type of 
> call in your target machine's nrpe.cfg file, as follows (at the very end):
>  
> # The following examples use hardcoded command arguments...
> command[check_hda1]=/usr/local/nagios/libexec/check_disk -w 20 -c 10 -p 
> /dev/hda1
>      This way, nrpe tells the target machine to call it's 
> /usr/local/nagios/libexec/check_disk command when the Nagios core engine 
> calls check_nrpe!check_hda1 on this target machine.
>  
>      Hope it helps, and most important that you understand what I tried 
> to tell you ;-)
>      Regards,
>  
>  
> Sebastian Ganame
>  
>  
> -----Original Message-----
> From: nagios-users-bounces at lists.sourceforge.net 
> [mailto:nagios-users-bounces at lists.sourceforge.net] On Behalf Of 
> Jonathan Murray
> Sent: Miércoles, 30 de Mayo de 2007 07:49 p.m.
> To: nagios-users at lists.sourceforge.net
> Subject: [Nagios-users] NRPE: Command 'check_disk' not defined
>  
> I've been staring at this for a long time, likely pilot error, but maybe
> someone has suggestions or sees something I don't...thanks.
>  
> Nagios server version 2.8, (OS debian)
> Nagios plugin version 1.4.7 (Red Hat Enterprise Linux WS release 4)
> NRPE version 2.7.1
>  
> other plugins work (check_swap, check_load)
>  
> On nagios server:
>  
> /usr/local/nagios/etc/checkcommands.cfg
>  
> <-snip->
>  
> # check_disk
> define command{
>           command_name    check_disk
>          command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -c check_disk
>          }
>  
> <-snip->
>  
> On the machine I'm trying to monitor, the one running nrpe 2.7.1 with
> the Nagios plugin version 1.4.7 (Red Hat Enterprise Linux WS release 4),
> in /usr/local/nagios/libexec/etc/nrpe.cfg:
>  
> [root at paleo etc]# ls -la
> total 28
> drwxr-xr-x  2 nagios nagios 4096 May 30 17:03 .
> drwxr-xr-x  6 nagios nagios 4096 May 30 17:13 ..
> -rwxr-xr-x  1 nagios nagios 7536 May 30 17:03 nrpe.cfg
>  
> <-snip->
>  
> command[check_disk]=/usr/local/nagios/libexec/check_disk -w 20 -c 10 -p
> /dev/sda5
>  
> <-snip->
>  
> when I test it from the server "nagios" it works fine:
>  
> root at nagios:/usr/local/nagios/libexec# ./check_nrpe -H paleo -c check_disk
> DISK OK - free space: / 201921 MB (93% inode=99%);|
> /=14918MB;228424;228434;0;22 8444
>  
> on the system running nrpe "paleo":
>  
> [root at paleo etc]# /usr/local/nagios/libexec/check_disk -w 20 -c 10 -p
> /dev/sda5
> DISK OK - free space: / 201921 MB (93% inode=99%);|
> /=14918MB;228424;228434;0;228444
>  
> If NRPE, Command 'check_disk' not defined as the web interface reports,
> then where should it be defined? I thought I needed to define the
> command in the checkcommands.cfg on the server, then define the command
> on the client that is running nrpe daemon.
>  
> thanks for any ideas,
>  
> Jonathan Murray
>  
>  
>  
>  
>  
>  
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