NRPE: Command 'check_disk' not defined
Jonathan Murray
jmurray at whoi.edu
Fri Jun 1 20:50:30 CEST 2007
Thanks Sebastian, the error was a result of two machines having the same
IP address in the hosts.cfg file. As usual, my error. Now that I have
eliminated my ridiculous oversight, everything is fine.
Thanks for your help, as a result of this process, the checkcommands.cfg
issue was resolved too.
-Jonathan
Sebastian Ganame wrote:
> Hi John,
> I think your problem is that you're defining "check_disk_sda5"
> in your checkcommands.cfg file, while it should be only in your
> "nrpe.cfg" file in each monitored instance.
> The only checkcommand you should have for nrpe redirection is
> the following one:
>
> /define command{/
> / command_name check_nrpe/
> / command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c
> $ARG1$/
> /}/
>
> This tells the system that for each service defined with a
> check_command like “check_nrpe!...” it should be redirected using that line.
>
> After this server side configuration, you should only define
> the check_disk_sda5 in your target system (the one that would end up
> reporting the metric), and it should work.
>
> Hope you make it with these information.
> Regards,
>
> Sebastian Ganame
>
>
> -----Original Message-----
> From: Jonathan Murray [mailto:jmurray at whoi.edu]
> Sent: Jueves, 31 de Mayo de 2007 01:47 p.m.
> To: Sebastian Ganame
> Cc: nagios-users at lists.sourceforge.net
> Subject: Re: [Nagios-users] NRPE: Command 'check_disk' not defined
>
> 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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