In this recipe, we'll learn how to set up PING monitoring for a host. We'll use the
check_ping plugin, and its command of the same name, to send ICMP ECHO requests to a host. We'll use this as a simple diagnostic check to make sure that the host's network stack is responding in a consistent and timely fashion, in much the same way an administrator might use the
ping(8) command interactively to check the same properties.
You should have a Nagios Core 4.0 or newer server with at least one host configured already. We'll use the example of
corinth.example.net, a host defined in its own file. You should also understand the basics of how hosts and services relate, which is covered in the recipes in Chapter 1, Understanding Hosts, Services, and Contacts.