In this recipe, we'll set up a service check to monitor the responsiveness of an HTTP and HTTPS server. We'll use the
check_http command and the plugin of the same name provided in the Nagios Plugins setup for making HTTP and HTTPS requests of a web server, and ensure that it returns an appropriate and timely response. This is useful in situations where it's necessary to check if a website is still functioning, particularly if there are times it comes under heavy load or suffers denial of service attacks.
You should have a Nagios Core 4.0 or newer server with at least one host configured already. We'll use the example of
sparta.example.net, a host defined in its own file. You should also understand the basics ...