Ruby (MRI) in a Docker container; based on Ubuntu Trusty (14.04.01 LTS) with Ruby 2.1 This is meant to be used as a foundation for Ruby applications, as this only contains Ruby. This ruby version is installed via Brightbox, to minize the build time.
More information can be found here (https://www.brightbox.com/docs/ruby/ubuntu/)
docker run -i -t tetheredge/ruby bash # ruby -v ruby 2.1.5p273 (2014-11-13 revision 48405) [x86_64-linux-gnu]
To get the Dockerfile from this repository on Github
docker build github.com/tetheredge/docker-ruby
To get a Docker image from Docker index
docker pull tetheredge/ruby