There’s plenty of documentation on how to deploy “Classic” style Sintra applications with Phusion Passenger, but it’s not immediately obviously how to deploy the new “Modular” style app (created with Sinatra::Base). Fortunately, it’s simple, the resulting class can be passed to “run” inside you “config.ru” file, something like:

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require 'rubygems'
require File.join(File.dirname(__FILE__), 'lib/my_app')

run MyApp

That’s it.

Instructions you find for “Classic” Sintra apps have you setting “:env” to the ENV[‘RACK_ENV’] before running the app. As of Sintra 1.0 it’s “:environment” and it’s automatically set to ENV[‘RACK_ENV’] (or “:development” if RACK_ENV is not set). You’ll also see instructions for setting “:run” to false, this is not nessecary for “Modular” apps.