how to activate a rails application on a VPS

kramf wrote in post #1072156:

Hello All,
I have installed rvm ,ruby, rails ,passenger and apache2 on an Ubuntu
11.10
VPS. I have scaffolded a rails application and changed config of apache
to
point to it. When I entered my site from a browser I got the default
rails
page. When I removed the index.html file from the public folder I got a
404
error. When I changed my config.ru file to include the demo "hello
world"
rack app from the passenger-pushion site , I got the message displayed
correctly on my browser. So what do I still miss to make my scaffold app
run in response to browser input ? Thanks, David

I didn't see mention of you setting up a "root" route. Did you do that?