Nagios QuickStart for Max OS X El Capitan
The Mac Tutorial Shows You Step-by-Step How-to Install and Getting-Started with Nagios Network Monitoring on Mac OS X 10.11 El Capitan Unix/BSD Desktop.
Nagios is a powerful monitoring system that enables organizations to identify and resolve IT infrastructure problems before they affect critical business processes.

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Open a Shell Terminal emulator window
Applications > Utilities > Terminal
(Press “Enter” to Execute Commands) -
How-to Install HomeBrew for Mac OS X 10.11 El Capitan:
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Installing Nagios for Mac OS X
brew install nagios
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Then Create a Command Directory:
mkdir -p ~/homebrew/var/lib/nagios/rw
sudo chgrp _www ~/homebrew/var/lib/nagios/rw
sudo chmod 2775 ~/homebrew/var/lib/nagios/rw
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How-to Install the Nagios Web Frontend on Mac OS X: