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Nagiosgraph ----------- File: $Id: README,v 1.10 2006/04/05 12:37:11 sauber Stab $ Author: (c) Soren Dossing, 2005 License: OSI Artistic License http://www.opensource.org/licenses/artistic-license.php Summary: Collects perfdata from Nagios check scripts and inserts data into rrd files. Data in the rrdfiles can be displayed in html pages with cgi script. Note: Nagios is a registered trademark of Ethan Galstad. Files: CHANGELOG - History of changes INSTALL - Dcoument for how to install and use nagiosgraph README - This file README.map - Document for how to create map file entries insert.pl - Reads perfdata log from nagios and insert into rrd files. show.cgi - Generates a html page for the host/sevice specified, and generates graphs on-the-fly. nagiosgraph.conf - paths and other configuration nagiosgraph.css - CSS stylesheet map - Regular expression to identify services and specification for how to create rrd files. testcolor.cgi - Preview of colors for keywords in each color scheme testentry.pl - A script for testing new map file entries. Usage: Follow the instructions in INSTALL for how to install and configure nagiosgraph. Getting Help: Discussions related to nagiosgraph are located in a Sourceforge help forum; http://sourceforge.net/forum/forum.php?forum_id=394748 . A Sourceforge account is necessary for posting. Principles of Operation: nagiosgraph is basically a simple interface between Nagios and rrd data files. Simplicity comes from three factors; it doesn't do much, behavior is programmed rather than configurable, and automatically detects new data from Nagios. nagiosgraphs is operating in two modes. One is to collect performance data from servicechecks from nagios, and the other is to display graphs of the performance data collected. All the data collected are stored in rrd files by using rrdtools. A file called 'map' defines how identify the data from nagios and how to store it in the rrd files. Nagios passes all the service data collected to a nagiosgraph script called 'insert.pl'. This script will look up in 'map', which rrd file to insert the data into, and how to name the data. In Nagios it's also possible to have extended service information pages. A nagiosgraph cgi script called 'show.cgi' can be used for such service information links. 'show.cgi' will look up in 'map' which performance data is stored in rrd files, and display graphs of this data. nagiosgraph will automatically detect when new hosts or services has been added in Nagios, so generally no configuration of nagiosgraph is necessary when configuration of Nagios changes. nagiosgraph is designed to only require very little configuration. Integrating with Nagios is a complicated process nevertheless. The 'README' file describes how to configure nagiosgraph and integrate with Nagios. The 'map' configuration file is actually perl code, that will be eval'ed by 'insert.pl' and 'show.cgi'. Several examples of servicechecks are included in the distributed 'map' file, but generally it's necessary to make modifications or add entries to match the output of the particular nagiosplugins in use. Knowing perl is helpful when making modifications, but the examples supplied should cover most types of performance data. By default all available data for a servicecheck will be displayed in the same graph. With extra configuration, embedded in the url, it's possible to display less data or to split values into multiple graphs. There is also a general method for specifying any rrd graph options.