Docker-Nagios 
Basic Docker image for running Nagios.
This is running Nagios 3.5.1
You should either link a mail container in as "mail" or set MAIL_SERVER, otherwise mail will not work.
Knobs
- NAGIOSADMIN_USER=nagiosadmin
- NAGIOSAMDIN_PASS=nagios
Web UI
The Nagios Web UI is available on port 80 of the container