(Nagios is an open source free network monitoring tool with powerful functions and strong flexibility. It can effectively monitor the host status of windows, Linux and UNIX, network settings such as switches and routers, printers, etc. Nagios usually consists of a main program (Nagios), a plug-in program (Nagios plugins), and four optional addons (nrpe, NSCA, nsclient++ and ndoutils). Nagios monitoring is implemented through plug-ins. Therefore, Nagios and Nagios plugins are necessary components for server-side work.)
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