Phusion Passenger is an easy and robust deployment of Ruby on Rails applications on Apache web servers.

Phusion Passenger (also known as mod_rack or mod_rails) makes deployment of Ruby web applications, such as those built on the revolutionary Ruby on Rails web framework, a breeze.

Phusion Passenger follows the usual Ruby on Rails conventions, such as “Don’t-Repeat-Yourself”.

Here are some key features of "Phusion Passenger":

· Deployment is only a matter of uploading application files. No Ruby (on Rails)-specific server configuration required!
· Built on the industry standard Apache web server.
· Allows Ruby on Rails applications to use about 33% less memory, when used in combination with Ruby Enterprise Edition (optional).
· Zero maintenance. No port management, server process monitoring or stale file cleanup required. Errors are automatically recovered whenever possible.
· Designed for performance, stability and security. Phusion Passenger should never crash Apache even in case of crashing Rails applications.
· Well-documented, for both system administrators and developers!