How to Use Rubinius and Puma on Heroku

In Three Steps

1. Install the Puma gem in your Gemfile

   gem "puma", "~> 2.2.2"

2. Tell Heroku to use Puma as your webserver in your Procfile (at the root of your app)

   web: bundle exec puma -p $PORT

3. Specify Rubinius as your ruby engine in your Gemfile

   ruby "1.9.3", :engine => "rbx", :engine_version => "2.0.0.rc1"

Confirmation

When you commit and push these changes to Heroku, if all goes well, you should see something this output:

-----> Using Ruby version: ruby-1.9.3-rbx-2.0.0.rc1
-----> Installing dependencies using Bundler version 1.3.0.pre.5
       Ruby version change detected. Clearing bundler cache.
       Old: ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-linux]
       New: rubinius 2.0.0.rc1 (1.9.3 release yyyy-mm-dd JI) [x86_64-unknown-linux-gnu]

To confirm that your app is really running on Rubinius 2.0, you can use the console.

heroku run console

First ask what the RUBY_ENGINE is

RUBY_ENGINE

You should get back rbx

"rbx"

Next, ask what version of Rubinius is running

Rubinius.version

It should be something that starts with rubinius 2.0.0.rc1

"rubinius 2.0.0.rc1 (1.9.3 release yyyy-mm-dd JI) [x86_64-unknown-linux-gnu]"

That's it! You're running Rubinius 2.0 on Heroku!