Unicorn is a pretty cool and super fast HTTP Server for Rack applications. You can install it with this command:

gem install unicorn

and you can run you Ruby on Rails app on it with this command:

<RAILS_ROOT>: unicorn_rails

Just navigate into your root app directory and type in “unicorn_rails”. By default it will run the server on Port 8080 and you app is available on:


Unicorn is optimized for Linux/Unix machines! You can not run your JRuby app on it, because some native extensions are not yet implemented for JRuby.


Published by Robert Reiz

CEO @ VersionEye. Passionated software developer since 1998.

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