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Dockerfile
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# syntax = docker/dockerfile:1
# Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
ARG RUBY_VERSION=2.6.6
FROM ruby:$RUBY_VERSION-slim as base
LABEL fly_launch_runtime="rails"
# Rails app lives here
WORKDIR /rails
# Set production environment
ENV RAILS_ENV="production" \
BUNDLE_PATH="vendor/bundle" \
BUNDLE_WITHOUT="development:test"
# Update gems and preinstall the desired version of bundler
ARG BUNDLER_VERSION=2.2.25
RUN gem update --system --no-document && \
gem install -N bundler -v ${BUNDLER_VERSION}
# Install packages needed to install nodejs
RUN apt-get update -qq && \
apt-get install --no-install-recommends -y curl unzip && \
rm -rf /var/lib/apt/lists /var/cache/apt/archives
# Install Node.js
ARG NODE_VERSION=14.15.4
RUN curl -fsSL https://fnm.vercel.app/install | bash && \
/root/.local/share/fnm/fnm install $NODE_VERSION
ENV PATH=/root/.local/share/fnm/aliases/default/bin/:$PATH
# Throw-away build stage to reduce size of final image
FROM base as build
# Install packages needed to build gems and node modules
RUN apt-get update -qq && \
apt-get install --no-install-recommends -y build-essential libpq-dev node-gyp pkg-config python-is-python3 redis
# Install yarn
ARG YARN_VERSION=1.22.10
RUN npm install -g yarn@$YARN_VERSION
# ARG BUILD_PACKAGES="git build-essential libpq-dev wget vim curl gzip xz-utils libsqlite3-dev python-is-python3 pkg-config"
# Install application gems
COPY Gemfile Gemfile.lock ./
RUN bundle _${BUNDLER_VERSION}_ install && \
bundle exec bootsnap precompile --gemfile
# Install node modules
COPY package.json package-lock.json yarn.lock ./
RUN yarn install
# Copy application code
COPY . .
# Precompile bootsnap code for faster boot times
RUN bundle exec bootsnap precompile app/ lib/
# Precompiling assets for production without requiring secret RAILS_MASTER_KEY
RUN SECRET_KEY_BASE=DUMMY ./bin/rails assets:precompile
# Final stage for app image
FROM base
# Install packages needed for deployment
RUN apt-get update -qq && \
apt-get install --no-install-recommends -y postgresql-client redis && \
rm -rf /var/lib/apt/lists /var/cache/apt/archives
# Copy built application from previous stage
COPY --from=build /rails /rails
# Deployment options
ENV RAILS_LOG_TO_STDOUT="1" \
RAILS_SERVE_STATIC_FILES="true"
# Entrypoint prepares the database.
ENTRYPOINT ["/rails/bin/docker-entrypoint"]
# Start the server by default, this can be overwritten at runtime
EXPOSE 3000
CMD ["./bin/rails", "server"]