Chaper 4: Nagios Basics
The fact that a host can be reached, in itself, has little meaning if no service is running on it on which somebody or something relies. Accordingly, everything in Nagios revolves around service checks. After all, no service can run without a host. If the host computer fails, it also cannot provide the desired service.
Things get slightly more complicated if a router, for example, is brought into play, which lies between users and the system providing services. If this fails, the desired service may still be running on the target host, but it is nevertheless no longer reachable for the user.
Nagios is in a position to reproduce such dependencies and to precisely inform the administrator of the failure of an important network component, instead of flooding the administrator with irrelevant error messages concerning services that cannot be reached. An understanding of such dependencies is essential for the smooth operation of Nagios, which is why Section 4.1 will look in more detail at these dependencies and the way Nagios works.
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