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It’s quite easy to get your server added as a Nagios client for monitoring on your centralized Nagios server.

You need few nagios packages listed below to be installed on your server first

# aptitude  install nagios-plugins nagios-nrpe-plugin nagios-nrpe-server

Aptitude will take care of the dependencies required.

Once this installation is done, Edit the nrpe configuration file which can be found at /etc/nagios/nrpe.cfg. Add the required checks and then restart nrpe server.

/etc/init.d/nagios-nrpe-server restart

You’re now ready to get the remote checks done for the server on your Nagios server.