RoR server for production

I'm new to Rails and am confused about running my RoR code on server (from linode.com). I have been developing my RoR application locally and I start my server using the rails server command. However, when I ported the same code to my server (git clone) and ran the command its asking me to create a new app. How can I make rails run my app? Also, what config changes are required to run the app on production environment.

I saw this, but am very confused about starting the server.