Munin is a network/system monitoring application that presents output in graphs through a web interface. Its emphasis is on simple plug and play capabilities. A large number of monitoring plugins are available. Using Munin you can easily monitor the performance of your computers, networks, SANs, and quite possibly applications as well. [...]
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Zenoss is an award-winning open source IT monitoring product that effectively manages the configuration, health and performance of networks, servers and applications through a single, integrated software package. Start by adding a zenoss entry to your apt sources (pico /etc/apt/sources.list): deb http://dev.zenoss.org/deb main stable
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Monitoring PowerDNS is easy with MRTG, just install these two packages and create a config file and you’re good to go! apt-get install libsnmp-session-perl mrtg
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