Introduction
In this tutorial, we will cover the installation of Nagios 4, a very
popular open source monitoring system, on CentOS 7 or RHEL 7. We will
cover some basic configuration, so you will be able to monitor host
resources via the web interface. We will also utilize the Nagios Remote
Plugin Executor (NRPE), that will be installed as an agent on remote
hosts, to monitor their local resources.
Nagios is useful for keeping an inventory of your servers, and making
sure your critical services are up and running. Using a monitoring
system, like Nagios, is an essential tool for any production server
environment.