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Nagios has extensive documentation available online (we are using Nagios 3.2.3) Nagios Core Version 3.x Documentation and  Nagios Documentation (Library, Guides and Links)

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What is Nagios?

Nagios is a network, and system, monitoring application.  Essentially, Nagios watches specified hosts, and services, then alerts you when something goes wrong.  Slac nagios is currently using Nagios core 3.2.3

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• login access to nagios02.slac.stanford.edu
• read access to the following directory, and executables, on nagios02.slac.stanford.edu
  • /etc/nagios and all subdirectories
  • /usr/lib64/nagios/plugins
• * privileges to run remctrl

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Basic Details

All the configuration files for Scientific Computing reside under /etc/nagios/sca/ on nagios02.slac.stanford.edu. Within this directory are a number of subdirectories on a per-monitoring-type basis. These are:

• fermi
• cdms
• exo

Within these directories are at least two files, a host.cfg (list of hosts and host groups) and a service.cfg (listing services and service groups). Inheritance is heavily used in order to avoid writing the same service checks or host directives repeatedly for each individual host. A generic template of basic services (e.g. ping, ssh) is inherited by all host files first and then the specific service directives are added on top of that.