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I am using Nagios for an energy efficiency project and workload balancing is a crucial aspect of the project. I am interested in how I can retrieve historical data from Nagios (e.g. CPU load for the past 10 minutes, memory usage for a process) and trends (e.g. CPU load increasing, decreasing). I am a beginner in regard to Nagios so any information about this subject would be helpful.

I am not interested in displaying the information in a graphical manner, I would like to use it in a custom application (Does Nagios have an interface -- web-service based or something else -- trough which to extract such data?).

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up vote 6 down vote accepted

Nagios doesn't do this out of the box, but there are plugins for it

Personally, I think you're using the wrong tool, you'd be better off with cacti

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cacti does graphing of historical data very well. nagios is recently getting into this via new plugins, but nagios is mainly for alert notification, not historical trends analysis. –  labradort Nov 30 '09 at 20:18
    
I'd also use Cacti, but Munin and Ganglia are other options. –  Marco Ramos May 12 '10 at 22:21

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