Creating a network host hierarchy
In this recipe, we'll learn how to establish a parent-child relationship for two hosts in a very simple network, in order to take advantage of Nagios Core's reachability logic. Changing this configuration is very simple; it involves adding only one directive, and optionally changing some notification options.
Getting ready
You will need to be running a Nagios Core 3.0 or newer server, and have at least two hosts, one of which is only reachable via the other. The host that allows communications with the other is the parent host . You should be reasonably confident that a loss of connectivity to the parent host necessarily implies that the child host becomes unreachable from the monitoring server.
Access to the web interface of Nagios Core would also be useful, as making this change will change the appearance of the network map, discussed in the Using the network map recipe in this chapter.
Our example will use a Nagios Core monitoring server, olympus.naginet...
