Dockerfile

FROM ruby:2.3.3
RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
RUN mkdir /myapp
WORKDIR /myapp
COPY Gemfile /myapp/Gemfile
COPY Gemfile.lock /myapp/Gemfile.lock
RUN bundle install
EXPOSE 3000
VOLUME /myapp
CMD ["bundle", "exec", "rails", "server", "-b", "0.0.0.0"]

run.sh

docker build -t image_name .  

docker run -p 3000:3000 -d -v ~/my_app1:/myapp --name container_name image_name

docker exec -it container_name bash