# example based on https://github.com/errm/fib FROM ruby:2.5 RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs libsodium-dev # Set an environment variable where the Rails app is installed to inside of Docker image ENV RAILS_ROOT /var/www/app_name RUN mkdir -p $RAILS_ROOT # Set working directory WORKDIR $RAILS_ROOT # Setting env up ENV RAILS_ENV='production' ENV RACK_ENV='production' # Adding gems COPY Gemfile Gemfile COPY Gemfile.lock Gemfile.lock RUN bundle install --jobs 20 --retry 5 --without development test # Adding project files COPY . . EXPOSE $PORT STOPSIGNAL SIGINT CMD ["bundle", "exec", "puma", "config.ru"]