$arr_19 ), array( 3, false, $arr_20, $arr_24 ), array( 2, false, "\" />", $arr_25 ) ) ); ?> $arr_27 ), array( 3, false, $arr_28, $arr_30 ), array( 2, false, "\" />\n\n", $arr_31 ) ) ); ?> array( 2, false, false, $arr_9 ), array( 4, $arr_10, "if", $arr_245, $arr_248 ), array( 2, false, "\n", $arr_249 ) ) ); ?> rr_466 ), array( 4, $arr_467, "if", $arr_482, $arr_484 ), array( 2, false, "\n", $arr_485 ) ) ); ?> Odin's Reporter » Linux Magazine
 

Creating a custom Munin plugin

Odin's Reporter

© Carinabella, photocase.com

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Munin collects information and plots parameters of your choice automatically and with minimal configuration. But if you can't find a plugin that captures the data you want to graph, you might have to roll your own.

Graphs make numerical data more accessible; or, as Edward R. Tufte puts it: "Graphics reveal data." [1] The Munin monitoring application is known for drawing simple and practical graphs. This helpful tool, which is named for a mythical raven who delivers news to the Norse god Odin, collects, stores, and plots data in daily, weekly, monthly, and annual charts (Figure 1).

Figure 1: Munin generates daily, weekly, monthly, and annual graphs.

Munin, a GPLed monitoring tool originally developed by the Norwegian Linux service provider Linpro [2], receives data through a system of plugins tailored for various monitoring activities. A collection of useful plugins come pre-bundled with the Munin monitoring tool, and other plugins are available from third-party sources on the Internet. However, if you are faced with a monitoring task that other users haven't imagined yet, you might need to create your own plug-in. The very extensible Munin lets you create custom plugins for monitoring a wide range of activities. In this article, I'll explain how to build a plugin that monitors airport departures and arrivals.

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