Build a docker image ready to develop rails apps. Rbenv is used to manage ruby.

To change the default ruby version installed (2.1.2), edit the Dockerfile

The image is ready to launch a rails app (tested with 4.1.1). The supervisor daemon launches a SSH server.

Build the image with: docker build -t <MY_NAME>/rails-rbenv . Launch a container with: docker run -d -i -t -P <MY_NAME>/rails-rbenv

User docker ps to check which ports are used to map 22 and 3000 ports of the container. To access the container the user is railsuser and the password s3cr3t (the user is also a sudoer)

You can ssh into the container and work by terminal or, as I suggest, mount a volume of the host where you have the rails project files, and launch the rails app from the container, so you can use an editor in the host to work on the project:

cd /PATH/TO/RAILS/PROJECT
docker run -P -d -i -t -v `pwd`:/home/railsuser/app tommyblue/rails-rbenv

SSH into the container then install required gems:

ssh [email protected] -p <CONTAINER_SSH_PORT>
cd ~/app
bundle install
bundle exec rails server