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Munin: monitor the performance of your computers, networks
by vrossign & 6 othersUsing Munin you can easily monitor the performance of your computers, networks, SANs, and quite possibly applications as well. It makes it easy to determine "what's different today" when a performance problem crops up. It makes it easy to see how you're doing capacity wise on all limited resources.
Cacti: The Complete RRDTool-based Graphing Solution
by vrossign & 4 othersCacti is a complete network graphing solution designed to harness the power of RRDTool's data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box.
The Multi Router Traffic Grapher
by vrossign & 2 othersMRTG is being used to graph all sorts of network devices as well as everything else from weather data to vending machines.
Monitoring avec Cricket
by vrossign & 2 othersCricket has two components, a collector and a grapher. The collector runs from cron every 5 minutes (or at a different rate, if you want), and stores data into a datastructure managed by RRD Tool. Later, when you want to check on the data you have collected, you can use a web-based interface to view graphs of the data.