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Nagios An open source computer system and network monitoring application software. It watches hosts and services that you specify and alerts you when there are errors and then when they are subsequently fixed. The services entail: • Monitoring of network services • Monitoring of host resources • Remote monitoring supported through SSH or SSL encrypted tunnels • Parallelized service checks • Ability to define network host hierarchy using “parent” hosts, allowing detection of and distinction between hosts that are down and those that are unreachable • Contact notifications when service or host problems occur and get resolved • Ability to define event handlers to be run during service or host events for proactive problem resolution • Automatic log file rotation • Support for implementing redundant monitoring hosts • Optional web interface for viewing current network status, notifications, problem history, log files, etc.