We know that Nagios is running by accessing its HTTP location. By default, provided we know the name or IP address of the monitor server, we can access Nagios via a web browser. Assuming that 192.168.56.20 is the IP of the server we're using to monitor PostgreSQL, the web interface would exist at http://192.168.56.20/nagios.
The Debian-based install will be at http://192.168.56.20/nagios3.
Our default Nagios dashboard should resemble this:
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