Rails 6 Dockerfile

Dockerfile

FROM ruby:2.7.0

RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - && \
  echo "deb https://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list && \
  apt-get update -qq && apt-get install -y \
  build-essential \
  nodejs \
  yarn

RUN mkdir /app
WORKDIR /app
COPY Gemfile Gemfile.lock ./
RUN gem install bundler
RUN bundle install --jobs 4 --retry 3
COPY package.json yarn.lock ./
RUN yarn install --check-files

COPY . /app

EXPOSE 3000

CMD ["bundle", "exec", "rails", "server", "-b", "0.0.0.0"]