Prepare image which is installed muliple versions of ruby and bundler for each versions.

You can use this image for your project soon. It's uploaded docker.io, tcnksm/rbenv.

docker pull tcnksm/rbenv

or in Dockerfile

FROM tcnksm/rbenv

Run it !

docker run -i -t tcnksm/rbenv bash -l -c 'rbenv global 2.0.0-p353; bundle ...'

Install multiple versions of ruby by rbenv. you can define ruby verion which you want to use in versions.txt.

Use Vagrant for VM running docker. Vagrant 1.4 has a Docker provisioner. Download it here.

After installed.

vagrant up

And login to VM.

vagrant ssh

Now you can use docker in VM.

docker build -t TAG .

Dockerfile execute belows;

1. Pull base image (this time ubuntu)
2. Install packages which are needed to build ruby
3. Clone rbenv
4. Clone ruby-build
5. Install multiple versions of ruby which are defined at versions.txt
6. Install Bundler for each version

• docker-plenv-vanilla
• Using Docker and Vagrant on Mac OS X with a Ruby on Rails application

tcnksm