- Dockerfile, Procfile, etc. Doing deploy is only .. - git push - press deploy button - speak to chatbot Eg. Configuration file FROM ruby:2.3 # throw errors if Gemfile has been modified since Gemfile.lock RUN bundle config --global frozen 1 RUN mkdir -p /usr/src/app WORKDIR /usr/src/app ONBUILD COPY Gemfile /usr/src/app/ ONBUILD COPY Gemfile.lock /usr/src/app/ ONBUILD RUN bundle install ONBUILD COPY . /usr/src/app RUN apt-get update && apt-get install -y nodejs --no-install-recommends && rm -rf /var/lib/apt/lists/* RUN apt-get update && apt-get install -y mysql-client postgresql-client sqlite3 --no-install-recommends && rm -rf /var/lib/apt/lists/* EXPOSE 3000 CMD ["rails", "server", "-b", "0.0.0.0"]