Nagios Support Forum

Posted: **Wed May 02, 2018 2:23 pm**

Hello,

i'm trying to monitor linux server.

i installed by referring to https://assets.nagios.com/downloads/nag ... e/NRPE.pdf

at first i got, SSl handshake failed. i troubleshooted. later i am getting error as "NRPE: Command 'check_disk' not defined"

referred many topics with this error but, but they didn't help.

On the client machine

/usr/local/nagios/libexec/check_nrpe -H localhost -t 30 -c check_users -a '-w 5 -c 10'
USERS OK - 3 users currently logged in |users=3;5;10;0

/usr/local/nagios/libexec/check_nrpe -H localhost -t 30 -c check_disk -a ' -w 85 -c 90 /usr'
NRPE: Command 'check_disk' not defined

on the GUI also the same error exists

I have attached the nrpe.conf file

Posted: **Wed May 02, 2018 4:08 pm**

when i change the command to monitor root its working, where as its not working on /opt file system

/usr/local/nagios/libexec/check_nrpe -H localhost -t 30 -c check_hda2 -a ' -w 85 -c 90 /dev/mapper/sysvg-lv_opt'
NRPE: Command 'check_hda2' not defined

Code: Select all

command[check_hda2]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/mapper/sysvg-lv_opt

Code: Select all

define service {
	host_name			server
	service_description		/opt Disk Usage
	use				xiwizard_nrpe_service
	check_command			check_nrpe!check_hda2!-a '-w 20% -c 10% -p /dev/mapper/sysvg-lv_opt'!!!!!!
	max_check_attempts		5
	check_interval			5
	retry_interval			1
	check_period			xi_timeperiod_24x7
	notification_interval		60
	notification_period		xi_timeperiod_24x7
	notifications_enabled		1
	contacts			herbert,Mohan Mummadi
	_xiwizard			linux-server
	register			1
	}

Posted: **Wed May 02, 2018 4:13 pm**

Hello, @MOHANREDDY.

Looks like you do not have a check_disk command defined in your nrpe.cfg file. Edit the file->Find the following paragraph:

Code: Select all

command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10
command[check_load]=/usr/local/nagios/libexec/check_load -r -w .15,.10,.05 -c .30,.25,.20
command[check_hda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/mapper/sysvg-lv_root
command[check_zombie_procs]=/usr/local/nagios/libexec/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/usr/local/nagios/libexec/check_procs -w 150 -c 200

And add this line underneath:

Code: Select all

command[check_disk]=/usr/local/nagios/libexec/check_disk $ARG1$

Save the file and restart the nrpe service.

Posted: **Mon May 07, 2018 3:40 pm**

Its working and thanks for the help

Posted: **Mon May 07, 2018 4:39 pm**

Glad to hear it! Are we good to close this up then?

Posted: **Tue May 08, 2018 8:07 am**

yes, you can thanks for the help

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