Chapter 4. Configuring the remote node on the Nagios Core server

Procedure

1. Install the check_nrpe plug-in:

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   [user@nagios]# cd ~
   [user@nagios]# wget https://github.com/NagiosEnterprises/nrpe/releases/download/nrpe-3.1.0/nrpe-3.1.0.tar.gz
   [user@nagios]# tar xvfz nrpe-3.1.0.tar.gz
   [user@nagios]# cd nrpe-3.1.0
   [user@nagios]# ./configure
   [user@nagios]# make check_nrpe
   [user@nagios]# make install-plugin

2. Create a configuration for the remote host:

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   [user@nagios]# cd /usr/local/nagios/etc/objects
   [user@nagios]# cp localhost.cfg mon.cfg

   Replace localhost with the hostname of the remote host, and the loopback IP address with the IP address of the remote host. Finally, delete or comment out the Host Group definition.

3. Change the file ownership to Nagios:

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   [user@nagios]# chown nagios:nagios mon.cfg

4. Add a cfg_file= reference to the mon.cfg file in /usr/local/nagios/etc/nagios.cfg:

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   [user@nagios]# vi /usr/local/nagios/etc/nagios.cfg

   Example

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   cfg_file=/usr/local/nagios/etc/objects/mon.cfg

5. Restart the Nagios server:

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   [user@nagios]# systemctl restart nagios

6. Ensure that the make and install procedures worked and that there is connectivity between the Nagios Core server and the remote host containing NRPE:

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   [user@nagios]# /usr/local/nagios/libexec/check_nrpe -H IP_ADDRESS_OF_REMOTE_HOST

   It should echo NRPE v3.1.0-rc1 if it is working correctly.