General-purpose Ruby Docker Image

NOTICE: due to the heartbleed bug, I've updated the 2.0.0-p247 image to the latest Ubuntu 12.04, as of June 6, 2014. If you were using the old one, I strongly suggest you update your image to the new tag, binaryphile/ruby:2.0.0-p247-hb. These files and associated images are provided AS-IS under the terms in the included file LICENSE.txt.

Description

Creates a Docker image with Ruby, rubygems and bundler.

Before you go building 2.0.0-p247, you can already use my image by running:

docker pull binaryphile/ruby:2.0.0-p247-hb

New: MRI 2.1.2 is also now available as binaryphile/ruby:2.1.2. Enjoy.

Also, if you want to know where the Dockerfile is, there isn't one. dockerfile.sh is a shell script which performs the steps that a Dockerfile would, which is why it is named that way.

The image is meant to be reusable, so you should only need to build a new image if you need a version of ruby other than 2.0.0-p247, otherwise you should just use mine.

Usage

• Copy sample.env to .env
• Edit .env and set:
  • RUBY_VERSION: the version of Ruby you want to install, as ruby-install would refer to it. Only specify a patch level if you need something other than the latest released version, e.g. 2.0.0-p247. New minor revisions of Ruby generally do not include the patch level in the download name and so can't include the patch level here.
  • RI_VERSION: the version of ruby-install to use
• (optional) if you have a preferred ubuntu mirror, you can change the line in .env which refers to "ubuntu.wikimedia.org"
• run ./dockerfile.sh and wait for it to finish
• determine the id of the finished container with docker ps -l (use sudo if need be)
• (optional) commit the image: docker commit [id] [your-index-name]/[your-repo-name][:optional tag]
• (optional) push your image: docker push [your-index-name]/[your-repo-name]

Troubleshooting

You can uncomment the "CMD=/bin/bash" line in .env to make dockerfile.sh give you an interactive shell inside the container prior to running install.sh.

Contents

The resulting image will contain a ruby interpreter installed in /usr/local that will be on your regular path, so you'll have access to ruby, gem, etc. If you are running bundler as a regular user, you'll want to pass it the --path [pathname] option to tell it not to use the system gems, since they'll fail when running as a regular user.