In this chapter, we will cover the following topics:
- Installing and configuring Nagios Core
- Setting up NRPE on remote client hosts
- Monitoring important remote system metrics
In this recipe, we will learn how to install Nagios Core version 4, an open-source network monitoring system that checks whether hosts and services are working and notifies users when problems occur or services become unavailable. Nagios provides solutions to monitor your complete IT infrastructure and is designed with an architecture that is highly extendable and customizable and goes far beyond simple bash scripts to monitor your services. (Refer to the Monitoring important server infrastructure recipe in Chapter 3, Managing the System.)