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Chapter 4. Configure the Nagios Core Server
After configuring NRPE on a Ceph host, configure the Nagios Core Server to recognize and monitor the host.
4.1. 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-plugin4.2. Check to Ensure Connectivity
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Ensure that the make and install procedures worked and that there is connectivity between the Nagios Core server and the remote host containing NRPE.
[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.
4.3. 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.
Change the file ownership to nagios.
[user@nagios]# chown nagios:nagios mon.cfg
Add a cfg_file= reference to the mon.cfg file in /usr/local/nagios/etc/nagios.cfg.
[user@nagios]# vim /usr/local/nagios/etc/nagios.cfgFor example:
cfg_file=/usr/local/nagios/etc/objects/mon.cfgThen, restart the Nagios server.
[user@nagios]# systemctl restart nagios
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