A Ruby parser and generator for Nagios
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$Id$ This is a collection of scripts and libraries meant to make it easy/possible to generate Nagios configurations. The first and probably most important part of the collection is the set of libraries. They include a parser for existing Nagios configurations plus the ability to create and easily print fully formed objects. With these libraries, you can: 1) Parse any existing configuration 2) Create new configurations from scratch using other objects (e.g., SQL or LDAP) 3) Write out either of the above configurations In addition to the libraries, a few utilities have been written. Currently (as of 7/26/04) these utilities are largely centered around a single purpose: Using cfengine (http://www.cfengine.org) to generate Nagios configurations for all of my clients. This collection is special, though, because it generates the configurations 1) on the client itself 2) and in two configurations -- one meant to be run against locally and one meant to be centralized and aggregated with all other clients. This results in a large star-type Nagios network. I have a Nagios process running on every host on my network, and the central Nagios server has two processes -- one running the aggregated config and one running the local config for the server. Every local nagios process uses nsca to submit passive checks, and the central server receives those, and produces warnings if the checks get stale. This system does not actually require cfengine, I just find it to be incredibly useful. The basic idea is that you run a script (currently at cfengine/modules/module:nagios), passing it 1) a list of services to monitor, and 2) a list of classes the server is a member of. The script matches those services against services defined in the 'checkcommands.cfg' file, and the classes are matched against 'hostgroups.cfg'. If any services not defined in 'checkcommands.cfg' are passed, an error will result, but it is assumed that there are many classes passed from cfengine that will not be hostgroups, so it is not an error to pass unknown hostgroups. See the cfengine/inputs/nagios.cf files for a basic example of how this is done. I know this isn't very well documented, but it's not actually that much code. Feel free to email me at <luke at madstop.com> for more information or whatnot.