This is a replacement for nagios server, stable and that uses a dashboard called thruk.
Here it a tutorial that will use four Servers
192.168.1.170 - Naemon Server - centos 7
192.168.1.21 - nrpe client - centos 6
192.168.1.182 - nrpe client - ubuntu
192.168.1.75 - nscp client - windows server 2012R2
Tutorial
https://www.howtoforge.com/tutorial/how-to-install-a-production-ready-naemon-server/
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