The purpose of this post is to let anyone quickly find how to accomplish a configuration task, and list here all the posibilities of the config.php file and also link to pages that explain how is each thing implemented.
This config is built on an Ubuntu 11.04 server.
Software is nginx, php-fpm (php5-fpm).
For performance, it's recommended to run php-fpm in SOCKET mode, instead of accessing via IP:PORT. That is the method shown below.