NRPE installation

[krishnar]

Hi All,

I need help with installing NRPE is my lab Nagios Server. I have follow these instruction to install NRPE:

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wget https://github.com/NagiosEnterprises/nrpe/archive/3.0.1.tar.gz
gunzip  3.0.1.tar.gz 
tar -xf 3.0.1.tar 
cd nrpe-3.0.1/
./configure --with-nagios-user=nagios --with-nagios-group=nagios
make
make all
make install

This configuration install NRPE plug to /usr/local/nagios folder. However, my Nagios is running in /opt/nagios.

Is there any way I can change the installation path to /opt/nagios ?

[tgriep]

When you run the configure script, you can change the destination of where the Agent is installed by using the prefix option.
In your case, you would run the following to install in the /opt/nagios folder.

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./configure --with-nagios-user=nagios --with-nagios-group=nagios --prefix=/opt/nagios

[krishnar]

Thank you for helping me..I have got one more query.

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[user@krishnar1 etc]$ cat nrpe.cfg | egrep ^command.*check_users
command[check_users]=/usr/local/nagios/libexec/check_users -w $ARG1$ -c $ARG2$

I have the above config in my remote host. I am not able to do the check from Nagios Core with passing the arguments.

-bash-4.2$ ./check_nrpe -H 172.31.116.108 -4 -c check_users -a 1 2
NRPE: Command 'check_users!1!2' not defined
-bash-4.2$

But this works fine!

-bash-4.2$ ./check_nrpe -H 172.31.116.108 -4 -c check_users
USERS OK - 1 users currently logged in |users=1;5;10;0
-bash-4.2$

Any help would be appreciated.

[krishnar]

After NRPE service restart in Remote host:

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-bash-4.2$ ./check_nrpe -H 172.31.116.108 -4 -c check_users
check_users: Warning threshold must be a positive integer
Usage:
check_users -w <users> -c <users>
-bash-4.2$ 
-bash-4.2$ 
-bash-4.2$ ./check_nrpe -H 172.31.116.108 -4 -c check_users -a 5 10
check_users: Warning threshold must be a positive integer
Usage:
check_users -w <users> -c <users>
-bash-4.2$ 

[tgriep]

There is a setting in the nrpe.cfg file called dont_blame_nrpe option. If it is set to 0, this disables the ability to pass arguments to the NRPE Agent and could be causing your issue.
Set that option to a 1 and restart the nrpe agent and see if you can pass arguments with the check_nrpe command.
You always have to restart the nrpe agent if you edit the nrpe,cfg file, BTW.

Also, try running your command like the following and see if that works.

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./check_nrpe -H 172.31.116.108 -4 -c check_users -a '5 10'

[lmiltchev]

Change this line (in the nrpe.cfg file) from this:

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dont_blame_nrpe=0

to this:

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dont_blame_nrpe=1

and restart nrpe service (if nrpe is running as a standalone daemon) or xinet.

Let us know if this helped.

[krishnar]

Oops..I forgot to mention that earlier..I had already enabled that option and restarted NRPE daemon in remote host after making changes to nrpe.cfg.

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[user@krishnar1 etc]$ grep blame nrpe.cfg
dont_blame_nrpe=1
# command arguments *AND* the dont_blame_nrpe directive in this
[user@krishnar1 etc]$ 
[user@krishnar1 etc]$ grep command_sub nrpe.cfg
allow_bash_command_substitution=1

From Nagios Core Host:
-bash-4.2$ ./check_nrpe -H 172.31.116.108 -4 -c check_users -a '5 10'
NRPE: Command 'check_users!5 10' not defined

The error says command is not defined.

This is the command definition in remote host nrpe.cfg file.

[user@krishnar1 etc]$ grep check_users nrpe.cfg
#command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10
command[check_users]=/usr/local/nagios/libexec/check_users -w $ARG1$ -c $ARG2$
#command[check_users]=/usr/local/nagios/libexec/check_users -w $ARG1$ -c $ARG2$
[user@krishnar1 etc]$

Totally confused!

[scottwilkerson]

Out of curiosity what version of check_nrpe do you have on your Nagios Core host

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./check_nrpe -h|head -7

[Box293]

The ./configure command requires --enable-command-args.

This is explained under the Compile section in this guide: https://support.nagios.com/kb/article.php?id=515

You may also find this document helpful:
https://assets.nagios.com/downloads/nag ... utions.pdf

[krishnar]

-bash-4.2$ ./check_nrpe -h | head -7

NRPE Plugin for Nagios
Copyright (c) 1999-2008 Ethan Galstad (nagios@nagios.org)
Version: 3.0.1
Last Modified: 09-08-2016
License: GPL v2 with exemptions (-l for more info)
SSL/TLS Available: OpenSSL 0.9.6 or higher required
-bash-4.2$