Graham McIntire
4e2d74e21c
Add a separate wgrib2-builder stage that compiles wgrib2 from source. Docker layer caching means this only builds once — subsequent deploys reuse the cached layer. The binary is copied into the final runtime image. Also fixed wgrib2 path lookup to be runtime instead of compile-time so it works in the Docker build pipeline.
128 lines
3.4 KiB
Docker
128 lines
3.4 KiB
Docker
# Find eligible builder and runner images on Docker Hub. We use Ubuntu/Debian
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# instead of Alpine to avoid DNS resolution issues in production.
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#
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# https://hub.docker.com/r/hexpm/elixir/tags?name=ubuntu
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# https://hub.docker.com/_/ubuntu/tags
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#
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# This file is based on these images:
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#
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# - https://hub.docker.com/r/hexpm/elixir/tags - for the build image
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# - https://hub.docker.com/_/debian/tags?name=trixie-20260316-slim - for the release image
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# - https://pkgs.org/ - resource for finding needed packages
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# - Ex: docker.io/hexpm/elixir:1.19.0-erlang-28.3-debian-trixie-20260316-slim
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#
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ARG ELIXIR_VERSION=1.19.0
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ARG OTP_VERSION=28.3
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ARG DEBIAN_VERSION=trixie-20260316-slim
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ARG BUILDER_IMAGE="docker.io/hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
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ARG RUNNER_IMAGE="docker.io/debian:${DEBIAN_VERSION}"
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# ---- wgrib2 build stage (cached independently) ----
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FROM ${RUNNER_IMAGE} AS wgrib2-builder
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ARG WGRIB2_VERSION=3.6.1
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RUN apt-get update \
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&& apt-get install -y --no-install-recommends \
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build-essential gfortran wget ca-certificates \
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zlib1g-dev libaec-dev libpng-dev \
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&& rm -rf /var/lib/apt/lists/*
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WORKDIR /tmp/wgrib2
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RUN wget -q "https://www.ftp.cpc.ncep.noaa.gov/wd51we/wgrib2/wgrib2.tgz.v${WGRIB2_VERSION}" \
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-O wgrib2.tgz \
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&& tar xzf wgrib2.tgz \
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&& cd grib2 \
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&& export CC=gcc FC=gfortran \
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&& make \
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&& cp wgrib2/wgrib2 /usr/local/bin/wgrib2 \
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&& strip /usr/local/bin/wgrib2
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# ---- Elixir build stage ----
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FROM ${BUILDER_IMAGE} AS builder
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# install build dependencies
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RUN apt-get update \
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&& apt-get install -y --no-install-recommends build-essential git \
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&& rm -rf /var/lib/apt/lists/*
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# prepare build dir
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WORKDIR /app
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# install hex + rebar
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RUN mix local.hex --force \
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&& mix local.rebar --force
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# set build ENV
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ENV MIX_ENV="prod"
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# install mix dependencies
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COPY mix.exs mix.lock ./
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RUN mix deps.get --only $MIX_ENV
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RUN mkdir config
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# copy compile-time config files before we compile dependencies
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# to ensure any relevant config change will trigger the dependencies
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# to be re-compiled.
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COPY config/config.exs config/${MIX_ENV}.exs config/
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RUN mix deps.compile
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RUN mix assets.setup
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COPY priv priv
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COPY lib lib
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# Compile the release
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RUN mix compile
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COPY assets assets
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# compile assets
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RUN mix assets.deploy
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# Changes to config/runtime.exs don't require recompiling the code
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COPY config/runtime.exs config/
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COPY rel rel
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RUN mix release
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# ---- Final runtime stage ----
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FROM ${RUNNER_IMAGE} AS final
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RUN apt-get update \
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&& apt-get install -y --no-install-recommends \
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libstdc++6 openssl libncurses6 locales ca-certificates snmp \
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libgfortran5 libaec0 zlib1g libpng16-16t64 \
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&& rm -rf /var/lib/apt/lists/*
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# Set the locale
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RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen \
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&& locale-gen
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ENV LANG=en_US.UTF-8
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ENV LANGUAGE=en_US:en
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ENV LC_ALL=en_US.UTF-8
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WORKDIR "/app"
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RUN chown nobody /app
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# set runner ENV
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ENV MIX_ENV="prod"
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# Copy wgrib2 binary from the build stage
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COPY --from=wgrib2-builder /usr/local/bin/wgrib2 /usr/local/bin/wgrib2
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# Only copy the final release from the build stage
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COPY --from=builder --chown=nobody:root /app/_build/${MIX_ENV}/rel/microwaveprop ./
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USER nobody
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# If using an environment that doesn't automatically reap zombie processes, it is
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# advised to add an init process such as tini via `apt-get install`
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# above and adding an entrypoint. See https://github.com/krallin/tini for details
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# ENTRYPOINT ["/tini", "--"]
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CMD ["/app/bin/server"]
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