====== Nagios ======
===== Core =====
  * http://askubuntu.com/questions/145518/how-do-i-install-nagios
  * https://www.digitalocean.com/community/articles/how-to-install-nagios-on-ubuntu-12-10
  * http://nagios.sourceforge.net/docs/nagioscore/3/en/addons.html
  * http://exchange.nagios.org/directory


===== XI =====
  * http://library.nagios.com/library/products/nagiosxi/downloads/main


===== TODO =====
  * /usr/lib/nagios/plugins


  - adduser www-data nagios