Setting up Client and Daemon NRPE

Monitorando windows server com o Nagios Core


This guide will cover the intallation and basic configuration of check_nrpe and nrpe service for CentOS7 distributions.
It is assumed that Nagios Core (source code) has already been installed.

What will you do ?

By following the instructions, you’ll learn to configure:

  • Source compiled NRPE running standalone (without xinetd).
  • NRPE settings, regarding association with localhost only plugins and enabling arguments for these plugins through NRPE.
  • Nagios Core integration and the basic check_nrpe command definition in commands.cfg and in a host cfg file.


During the installation, you will need root access on the machine.

Make sure the packets below are available and updated in your system.

  • Apache
  • PHP
  • Compilador GCC
  • GD development libraries
  • SSL development libraries

You can use yum to install these packets, but it must be executed with root privelege:

	yum install openssl-devel

1) Installing NRPE Client

Download NRPE 2.15 packet into the tmp folder.

	cd /tmp/


Unpack the file and enter the generated subdirectory.

	tar zxvf nrpe-2.15.tar.gz

	cd nrpe-2.15/

Run the configure script and proceed by compiling and installing.

	./configure --enable-command-args --enable-ssl

	make && make install

Allocate the NRPE initialization script and config file towards their respective default directories.

        cp init-script /etc/init.d/nrpe

	cp sample-config/nrpe.cfg /usr/local/nagios/etc/nrpe.cfg/

Assign the permissions for command processing.

        chmod +x /etc/init.d/nrpe

        chown -R nagios:nagios /usr/local/nagios/etc/nrpe.cfg

        chmod 664 /usr/local/nagios/etc/nrpe.cfg

	chown -R nagios:nagios /usr/local/nagios/libexec/check_nrpe

	chmod 755 /usr/local/nagios/libexec/check_nrpe

2) Configuring NRPE service (daemon)

Open NRPE config file and edit the following lines as follows.

 vi /usr/local/nagios/etc/nrpe.cfg
        {LINE 81}
        allowed_hosts=,[IP DO CLIENTE NRPE REMOTO]

        {LINE 97}

        {LINES 219 TO 223}
        [COMMENT (#) THE LINES]

        {LINES 236 TO ...}
        command[check_*)=/usr/local/nagios/libexec/check_* $ARG1$

Launch NRPE service and its autostart on boot.

	service nrpe restart

	systemctl enable nrpe

3) NRPE settings sample in Nagios

Open Nagios commands.cfg file and add the following lines.

 vim /usr/local/nagios/etc/objects/commands.cfg
        define command{
                command_name    check_nrpe
                command_line    $USER1$/check_nrpe -H $HOSTADDRESS$ -t 30 -c $ARG1$ $ARG2$

Open any desired service/host configuration file (if custom, don’t forget to add it to nagios.cfg !!!) and add the following lines.

 vim /usr/local/nagios/etc/objects/localhost.cfg

 define service{
  use local-service
  host_name localhost
  service_description NRPE
  check_command check_nrpe!check_disk!-a '-w 20% -c 10% -p /'

Save the changes and restart Nagios. You can already see the execution of the service through the web interface: http://localhost/nagios.

Posted in: Nagios Core, Plugin, Uncategorized

Leave a Comment (0) ↓

Leave a Comment