hybrid dockerfile

Dockefile

ARG RUBY_VERSION
# === Base image ===
FROM ruby:${RUBY_VERSION}-slim-buster as base

ARG NODE_MAJOR
ARG POSTGRES_VERSION
ARG BUNDLER_VERSION
ARG YARN_VERSION

# Common dependencies
RUN apt-get update -qq \
  && apt-get dist-upgrade -y \
  && DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
    build-essential \
    gnupg2 \
    curl \
    less \
    git \
  && apt-get clean \
  && rm -rf /var/cache/apt/archives/* \
  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
  && truncate -s 0 /var/log/*log

# Node
RUN curl -sL https://deb.nodesource.com/setup_${NODE_MAJOR}.x | bash -

# Postgres client
RUN curl -sSL https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add - \
  && echo 'deb http://apt.postgresql.org/pub/repos/apt/ buster-pgdg main' ${POSTGRES_VERSION} > /etc/apt/sources.list.d/pgdg.list

# Yarn
RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
  && echo 'deb http://dl.yarnpkg.com/debian/ stable main' > /etc/apt/sources.list.d/yarn.list

# App's dependencies
RUN apt-get update -qq \
  && DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
    postgresql-client-${POSTGRES_VERSION} \
    libpq-dev \
    nodejs \
    yarn=${YARN_VERSION}-1 \
  && apt-get clean \
  && rm -rf /var/cache/apt/archives/* \
  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
  && truncate -s 0 /var/log/*log

RUN mkdir /app

# Bundler
ENV LANG=C.UTF-8 \
  BUNDLE_JOBS=4 \
  BUNDLE_RETRY=3
RUN gem update --system \
  && gem install bundler:${BUNDLER_VERSION}

EXPOSE 3000

# === Development image ===
FROM base as development

ENV RAILS_ENV=development

RUN apt-get update -qq \
  && DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
    vim \
  && apt-get clean \
  && rm -rf /var/cache/apt/archives/* \
  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
  && truncate -s 0 /var/log/*log

WORKDIR /app

CMD ["/usr/bin/bash"]


# === Image that installs libraries and compiles assets for production image ===
FROM base as production-builder

ENV RAILS_ENV=production

# Container user
RUN groupadd --gid 1005 my_user \
  && useradd --uid 1005 --gid my_user --shell /bin/bash --create-home my_user

USER my_user

RUN mkdir /home/my_user/app

WORKDIR /home/my_user/app

# JS packages
COPY --chown=my_user:my_user package.json yarn.lock ./

RUN yarn install --check-files

# Ruby gems
COPY --chown=my_user:my_user Gemfile* .ruby-version ./

ENV BUNDLE_APP_CONFIG=/home/my_user/bundle \
  BUNDLE_PATH=/home/my_user/bundle \
  GEM_HOME=/home/my_user/bundle

RUN mkdir $BUNDLE_PATH \
  && bundle install --without development test --deployment --no-cache --path $BUNDLE_PATH \
  && rm -rf $BUNDLE_PATH/ruby/2.6.0/cache/* \
  && rm -rf /home/my_user/.bundle/cache/*

# Code
COPY --chown=my_user:my_user . .

# Precompile assets
ARG SECRET_KEY_BASE=qwerty
ARG DATABASE_URL=postgres://postgres:postgres@postgres:5432
ARG REDIS_URL=redis://redis:6379/0
ARG CACHE_REDIS_URL=redis://redis-cache:6379/0
ARG IMGPROXY_ENDPOINT=http://localhost:3080

RUN bundle exec rake assets:precompile

# == Production image ==
FROM ruby:${RUBY_VERSION}-slim-buster AS production

# Common dependencies
RUN apt-get update -qq \
  && apt-get dist-upgrade -y \
  && DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
    curl \
    gnupg2 \
    less \
    tzdata \
    time \
    locales \
  && apt-get clean \
  && rm -rf /var/cache/apt/archives/* \
  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
  && truncate -s 0 /var/log/*log \
  && update-locale LANG=C.UTF-8 LC_ALL=C.UTF-8

# Postgres client for rails dbconsole -p
RUN curl -sSL https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add - \
  && echo 'deb http://apt.postgresql.org/pub/repos/apt/ buster-pgdg main' ${POSTGRES_VERSION} > /etc/apt/sources.list.d/pgdg.list \
  && apt-get update -qq \
  && DEBIAN_FRONTEND=noninteractive apt-get install -yq --no-install-recommends \
    postgresql-client-${POSTGRES_VERSION} \
    libpq5 \
  && apt-get clean \
  && rm -rf /var/cache/apt/archives/* \
  && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* \
  && truncate -s 0 /var/log/*log

RUN gem update --system

ENV RAILS_ENV=production \
  MALLOC_ARENA_MAX=2 \
  BUNDLE_APP_CONFIG=/home/my_user/bundle \
  BUNDLE_PATH=/home/my_user/bundle \
  GEM_HOME=/home/my_user/bundle \
  LANG=C.UTF-8 \
  LC_ALL=C.UTF-8

# Container user
RUN groupadd --gid 1005 my_user \
  && useradd --uid 1005 --gid my_user --shell /bin/bash --create-home my_user

RUN mkdir /home/my_user/app

WORKDIR /home/my_user/app

USER my_user

EXPOSE 3000

RUN gem install bundler -v "${BUNDLER_VERSION}"

COPY --from=production-builder $BUNDLE_PATH $BUNDLE_PATH
COPY --from=production-builder /home/my_user/app/public/packs /home/my_user/app/public/packs

# Code
COPY --chown=my_user:my_user . .

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