Nagios Monitor Server, and NRPE clients, giving funny results

[Marc Powell]

On May 8, 2009, at 4:26 AM, Gabriel - IP Guys wrote:

> Dear All,
>
> I'm trying to get my Nagios instance to behave properly! It seems to  
> be
> monitoring my servers just fine, but for some reason, all my servers,
> which are different from each other show the same swap space, and the
> same free disk space to within 10 megs.

This tells me that you're most likely not monitoring those through  
NRPE on the remote machines. I suspect that this is the value for your  
nagios machine. Config examples would help clarify.

> ./Check_nrpe -H client_ip -c check_disk 50 80
>
> My understanding tells me that the following happens
>
> *	The check_nrpe plugin on the nagios monitor server runs, and
> accesses the client at client_ip

Correct.

> *	It initiates its local check_disk plugin with the parameters of
> 50 and 80.

Incorrect. check_nrpe does not pass arguments to the remote NRPE  
daemon unless --
	- it was compiled with the --enable-command-args flag
	- dont_blame_nrpe is set in nrpe.cfg
	- you pass them with the -a switch to check_nrpe
	- See the SECURITY document for NRPE for documentation and examples.

> *	This causes the check_disk plugin on the client to run, as if
> typed locally in this manner check_disk -w 50 -c 80

No, but you may specify those arguments in the command definition in  
nrpe.cfg instead of trying to pass them via check_nrpe.

> Running check_disk 50 80 on client_ip returns data on the disk state
> Running ./Check_nrpe -H client_ip -c check_disk 50 80 on Nagios  
> monitor
> server returns unknown argument
>
>
> I cannot figure out what is causing this discrepancy - check_nrpe -H
> client_ip returns Nagios version so I know the communication works.

I expect you see now that the '50 80' is being interpreted as an  
argument to check_nrpe itself, not check_disk, hence the 'unknown  
argument' error. If they're static numbers, you're probably fine just  
specifying them in each host's nrpe.cfg file.

--
Marc

------------------------------------------------------------------------------
The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your
production scanning environment may not be a perfect world - but thanks to
Kodak, there's a perfect scanner to get the job done! With the NEW KODAK i700
Series Scanner you'll get full speed at 300 dpi even with all image 
processing features enabled. http://p.sf.net/sfu/kodak-com
_______________________________________________
Nagios-users mailing list
Nagios-users at lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nagios-users
::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. 
::: Messages without supporting info will risk being sent to /dev/null