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Plesk for Linux gives you the ability to deploy Ruby web applications on
your web sites. Plesk supports all Ruby web applications that use the
Rack interface (http://rack.github.io/), including web applications
built in the most popular Ruby frameworks, such as Ruby on Rails
(http://rubyonrails.org/) or Sinatra (http://www.sinatrarb.com/).
When you upload a Ruby application to your domain’s directory and enable
Ruby support on the domain, Plesk detects and registers the application.
You can then install all necessary gems (Ruby code packages) using
Bundler - the utility for tracking and installing the specific
versions of gems required by the application (read more at
http://bundler.io/), add environment variables, edit the configuration
files, and restart the application. For details, refer to Manage Ruby
Applications.
Additionally, you can manage Ruby versions via CLI and
run Rake tasks.
To take advantage of this feature, make sure that the following
requirements are met:
- The Ruby extension must be installed in Plesk. The extension
 automatically installs two components: Ruby support and Phusion
 Passenger server. Phusion Passenger is an application server that
 allows you to load an application and serve the requests to it as
 fast as possible. It is installed as a module of the Apache or nginx
 web server. You can find more information at
 (https://en.wikipedia.org/wiki/Phusion_Passenger).
- The complex Ruby applications (for example, the applications based on
 the Ruby on Rails framework) often require compilation during gems
 installation. To install such gems in easy manner, the special
 Tools required for building Ruby gems component should be
 installed (for details, refer to Adding and Removing Plesk
 components).
 This component provides the development libraries required for
 compilation of the most popular Ruby gems to ensure that Bundler can
 install gems successfully.
- A domain should have a service plan granting the Ruby support
 management permission.