Debian and Nagios3: How to configure contacts and groups.

https://blog.giuseppeurso.net/wp-content/uploads/2012/12/Nagios_logo_black-180x110.png
I’m writing this as reference for the me in the future. It’s a little guide not only to get Nagios3 work in minutes but also to completelly understand how to configure Nagios3 in all its features but withoutgoing too deep, with macros or complicated configurations. Easy to replicate...
Debian and Nagios3: How to configure contacts and groups.