↓dockerfile
syntax = docker/dockerfile:experimental
Dockerfile used to build a deployable image for a Rails application.
Adjust as required.
Common adjustments you may need to make over time:
* Modify version numbers for Ruby, Bundler, and other products.
* Add library packages needed at build time for your gems, node modules.
* Add deployment packages needed by your application
* Add (often fake) secrets needed to compile your assets
#######################################################################
Learn more about the chosen Ruby stack, Fullstaq Ruby, here:
We recommend using the highest patch level for better security and
performance.
ARG RUBY_VERSION=2.7.7
ARG VARIANT=jemalloc-slim
FROM Quay as base
LABEL fly_launch_runtime=“rails”
ARG BUNDLER_VERSION=2.1.4
ARG RAILS_ENV=production
ENV RAILS_ENV=${RAILS_ENV}
ENV RAILS_SERVE_STATIC_FILES true
ENV RAILS_LOG_TO_STDOUT true
ARG BUNDLE_WITHOUT=development:test
ARG BUNDLE_PATH=vendor/bundle
ENV BUNDLE_PATH ${BUNDLE_PATH}
ENV BUNDLE_WITHOUT ${BUNDLE_WITHOUT}
RUN mkdir /app
WORKDIR /app
RUN mkdir -p tmp/pids
RUN gem update --system --no-document &&
gem install -N bundler -v ${BUNDLER_VERSION}
#######################################################################
install packages only needed at build time
FROM base as build_deps
ARG BUILD_PACKAGES=“git build-essential libpq-dev wget vim curl gzip xz-utils libsqlite3-dev”
ENV BUILD_PACKAGES ${BUILD_PACKAGES}
RUN --mount=type=cache,id=dev-apt-cache,sharing=locked,target=/var/cache/apt
–mount=type=cache,id=dev-apt-lib,sharing=locked,target=/var/lib/apt
apt-get update -qq &&
apt-get install --no-install-recommends -y ${BUILD_PACKAGES}
&& rm -rf /var/lib/apt/lists /var/cache/apt/archives
#######################################################################
install gems
FROM build_deps as gems
COPY Gemfile* ./
RUN bundle install && rm -rf vendor/bundle/ruby/*/cache
#######################################################################
install deployment packages
FROM base
ARG DEPLOY_PACKAGES=“postgresql-client file vim curl gzip libsqlite3-0”
ENV DEPLOY_PACKAGES=${DEPLOY_PACKAGES}
RUN --mount=type=cache,id=prod-apt-cache,sharing=locked,target=/var/cache/apt
–mount=type=cache,id=prod-apt-lib,sharing=locked,target=/var/lib/apt
apt-get update -qq &&
apt-get install --no-install-recommends -y
${DEPLOY_PACKAGES}
&& rm -rf /var/lib/apt/lists /var/cache/apt/archives
copy installed gems
COPY --from=gems /app /app
COPY --from=gems /usr/lib/fullstaq-ruby/versions /usr/lib/fullstaq-ruby/versions
COPY --from=gems /usr/local/bundle /usr/local/bundle
#######################################################################
Deploy your application
COPY . .
Adjust binstubs to run on Linux and set current working directory
RUN chmod +x /app/bin/* &&
sed -i ‘s/ruby.exe\r*/ruby/’ /app/bin/* &&
sed -i ‘s/ruby\r*/ruby/’ /app/bin/* &&
sed -i ‘/^#!/aDir.chdir File.expand_path(“…”, dir)’ /app/bin/*
The following enable assets to precompile on the build server. Adjust
as necessary. If no combination works for you, see:
ENV SECRET_KEY_BASE 1
ENV AWS_ACCESS_KEY_ID=1
ENV AWS_SECRET_ACCESS_KEY=1
Run build task defined in lib/tasks/fly.rake
ARG BUILD_COMMAND=“bin/rails fly:build”
RUN ${BUILD_COMMAND}
Default server start instructions. Generally Overridden by fly.toml.
ENV PORT 8080
ARG SERVER_COMMAND=“bin/rails fly:server”
ENV SERVER_COMMAND ${SERVER_COMMAND}
CMD ${SERVER_COMMAND}
