Ruby web applications use Phusion Passenger as an app server. You can run an application by placing the following in an .htaccess file in your ~/www-root/ directory:

PassengerAppType rack
PassengerAppRoot /users/m/y/mynetid/www-root
PassengerRuby /usr/local/bin/ruby24

PassengerAppRoot should be the full path to the directory where your application's Rack startup file config.ru is located.

PassengerRuby should be the full path to your preferred version of Ruby and varies by your silk platform version.

Choosing a version of Ruby

You can choose among multiple versions of Ruby, depending on which silk platform version your account is hosted on:

Silk platform	Ruby version	PassengerRuby value
silkv2	1.9	/usr/local/bin/ruby19
silkv2	2.4 (default)	/usr/local/bin/ruby24