The goal is to set up DigitalOcean's droplet (with full web stack, including nginx, unicorn and postgresql), and deploy Rails app with minimal efforts.
Start with installing vpsb gem
gem install vpsb
Then start the process with:
vpsb i directory_name_where_all_files_will_be_downloaded
In the last step you will be asked for several questions to provide base configuration
At the end you will have working Rails app.
Process requires creating account in DigitalOcean service.
More information you can find here: https://github.com/pniemczyk/bootstrap_chef_in_do