defektive/ruby-rails repository overview

⁠Ruby 2.3, Node 6.2, PostgreSQL Client, and base Rails gems pre-installed

⁠Setting up a new app

mkdir app_name
cd app_name
docker run -v `pwd`:/tmp/app defektive/ruby-rails rails new --skip-bundle /tmp/app/my_awesome_app
sudo chown -R `whoami` ./
mv my_awesome_app src

I recommend removing config/databse.yml and use the DATABASE_URL environment variable.