# Ruby Rack

## Overview

Currently, Clever Cloud supports Rack-based applications.
Created in 2007, Rack has become the de-facto standard for ruby web applications and is used in many frameworks such as Ruby on Rails.

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## Configure your Ruby and Rake application

### Mandatory configuration

Be sure that:

* Bundler is installed locally (`gem install bundler`)
* you have a `config.ru` file
* Git (for the deploy part)
* you have a `gems.rb` or `Gemfile` containing your dependencies

### Tutorial and sample app

- [An hello world tutorial of a Ruby and Rack application](/guides/ruby-rack-app-tutorial)

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To access environment variables from your code, just get them from the environment with `ENV["MY_VARIABLE"]`.

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