Icinga is an enterprise grade open source monitoring system which keeps watch over networks and any conceivable network resource, notifies the user of errors and recoveries and generates performance data for reporting. It is a fork of Nagios. This tutorial explains how to serve the Icinga Web interface from an nginx server on Debian Wheezy/Ubuntu 11.10 (the tutorial might work for Debian Squeeze as well but I didn’t test; Squeeze’s Icinga version is a lot older than the versions for Wheezy and Ubuntu 11.10, so there might be small differences).
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