The previous chapter discussed the basic configuration of host and service checking. Nagios can be set up to check if your services are up and running. This chapter describes in detail how these checks work. It also introduces some of the Nagios plugins that are developed as a part of Nagios and as a part of the Nagios plugins project.
Nagios' strength comes from its ability to monitor servers and the services that they offer in a large number of ways. What's more interesting is that all of these ways make sure that your services are functional, external plugins, and work in quite an easy way. Many of these are even shipped with Nagios, as we mentioned in Chapter 2, Installing Nagios 4. Therefore, it is possible to either existing plugins or write your own. In this chapter, we will learn the checks that can be made using the Nagios plugins project, and we will cover the following:
Using the standard checks for the host that is alive, and basic TCP/UDP checks...