This Docker image is deprecated. Please use the Heroku-16 image.
Learn more about local development with Docker Compose and deploying your image to Heroku.

Heroku Ruby Docker Image

This image is for use with Heroku Docker CLI.

Usage

Your project must contain the following files:

• Gemfile and Gemfile.lock
• Ruby 2.2.3
• assets:precompile rake task
• Procfile (see the Heroku Dev Center for details)

Then create an app.json file in the root directory of your application with at least these contents:

{
  "name": "Your App's Name",
  "description": "An example app.json for heroku-docker",
  "image": "heroku/ruby"
}

Install the heroku-docker toolbelt plugin:

$ heroku plugins:install heroku-docker

Initialize your app:

$ heroku docker:init
Wrote Dockerfile
Wrote docker-compose.yml

And run it with Docker Compose:

$ docker-compose up web

The first time you run this command, Bundler will download all dependencies into the container, precompile your assets (using the assets:precompile rake task), build your application, and then run it. Subsequent runs will use cached dependencies (unless your GemfileorGemfile.lock` has changed).

You'll be able to access your application at http://<docker-ip>:8080, where <docker-ip> is either the value of running boot2docker ip if you are on Mac or Windows. If you're running it natively, you'll need to use docker inspect to find the IPAddress key.