In this recipe, we'll create a new servicegroup. This allows us to make meaningful groups out of a set of arbitrary services so that we can view the status of all those services in a separate part of the web administration area.
You should have a working Nagios Core 4.0 or better server running with a web interface.
You should also have at least two defined services that form a meaningful group; perhaps they're similar kinds of services, such as mail services, are monitored by the same team, or they are both on the same set of servers at a physical location.
In this example, we have three servers performing mail functions:
imap.example.net, running an SMTP, POP3, and ...