Check_MK is an extension to the Nagios monitoring system that allows creating rule-based configuration using Python and offloading work from the Nagios core to make it scale better, allowing more systems to be monitored from a single Nagios server. It comes with a set of system checks, a mod_python and JavaScript based web user interface, and a module that allows fast access to the Nagios core. On top of Nagios it also adds additional features. It can be used as a front-end and extension of a Nagios, Icinga or Shinken monitoring system, for monitoring performance and health of networking devices, servers and infrastructure systems.

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