Nagios Support Forum

Hi,

We are getting the below NRPE errors when we onboarded Linux host on Nagios XI. Please help

NRPE:command Check_disk not defined
NRPE:command Check_mem not defined
NRPE:command Check_cpu_stats not defined
NRPE:command Check_services not defined
NRPE:command Check_swap not defined

Beena

What is the OS/architecture of the client (remote machine)? Can you show us how these commands are defined on the client?

Show us the actual command that you are running from the command line on the Nagios XI server along with the output of it.

Hi,

The OS/Architecture is as follows -

[email protected]:~# uname -a
Linux xx.xx.xx.xx 3.16.0-30-generic #40~14.04.1-Ubuntu SMP Thu Jan 15 17:43:14 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

And NRPE config file details are as follows -

# The following examples use hardcoded command arguments...

command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10
command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
command[check_hda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/hda1
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


# The following examples allow user-supplied arguments and can
# only be used if the NRPE daemon was compiled with support for
# command arguments *AND* the dont_blame_nrpe directive in this
# config file is set to '1'. This poses a potential security risk, so
# make sure you read the SECURITY file before doing this.

#command[check_users]=/usr/local/nagios/libexec/check_users -w $ARG1$ -c $ARG2$
#command[check_load]=/usr/local/nagios/libexec/check_load -w $ARG1$ -c $ARG2$
#command[check_disk]=/usr/local/nagios/libexec/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$
#command[check_procs]=/usr/local/nagios/libexec/check_procs -w $ARG1$ -c $ARG2$ -s $ARG3$


And the commands used are as below -

check_nrpe -H <Hostaddress> -t 30 -c check_cpu_stats -a '-w 80 -c 90'
check_nrpe -H <Hostaddress> -t 30 -c check_mem -a '-w 20 -c 10'
check_nrpe -H <Hostaddress> -t 30 -c check_disk -a '-w 15% -c 10% -p/'
check_nrpe -H <Hostaddress> -t 30 -c check_swap -a '-w 20 -c 10'
check_nrpe -H <Hostaddress> -t 30 -c check_services -a '<service name>'

Beena

command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10
command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
command[check_hda1]=/usr/local/nagios/libexec/check_disk -w 20% -c 10% -p /dev/hda1
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

The arguments are "hard-coded". Why are you trying to pass them again?

check_nrpe -H <Hostaddress> -t 30 -c check_cpu_stats -a '-w 80 -c 90'
check_nrpe -H <Hostaddress> -t 30 -c check_mem -a '-w 20 -c 10'
check_nrpe -H <Hostaddress> -t 30 -c check_disk -a '-w 15% -c 10% -p/'
check_nrpe -H <Hostaddress> -t 30 -c check_swap -a '-w 20 -c 10'
check_nrpe -H <Hostaddress> -t 30 -c check_services -a '<service name>'

Here's the two scenarios that you can use:
1.
On the client: Test from XI: 2.
On the client: Test from XI: It is strange you are getting errors like this one:

NRPE:command Check_disk not defined

"Check_disk" is not the same as "check_disk"... Did you define your service (in XI) with "Check_disk" (capital "C") in the "check_command" directive?

[[email protected] libexec]# ./check_nrpe -H 10.xx.xx.xx.xx -c check_users
USERS OK - 0 users currently logged in |users=0;5;10;0

No there is nothing case sensitive, all are in lower letters

Do we need to define these commands in remote host anywhere?

Thanks,
Beena

Yes, the commands need to be defined on the remote box. From the commands that you showed us, I see that "check_disk" is defined in your nrpe.cfg file, but it is commented out:

#command[check_disk]=/usr/local/nagios/libexec/check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$

You can change it to: and restart xinetd (or nrpe if it is running as a stand alone daemon)
Next, test your check from the XI: Instead of passing 3 arguments, you could pass only one, for example:

On the remote box: On XI: