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1# Find eligible builder and runner images on Docker Hub. We use Ubuntu/Debian
2# instead of Alpine to avoid DNS resolution issues in production.
3#
4# https://hub.docker.com/r/hexpm/elixir/tags?page=1&name=ubuntu
5# https://hub.docker.com/_/ubuntu?tab=tags
6#
7# This file is based on these images:
8#
9# - https://hub.docker.com/r/hexpm/elixir/tags - for the build image
10# - https://hub.docker.com/_/debian?tab=tags&page=1&name=bullseye-20210902-slim - for the release image
11# - https://pkgs.org/ - resource for finding needed packages
12# - Ex: hexpm/elixir:1.14.0-erlang-25.0.4-debian-bullseye-20210902-slim
13#
14ARG ELIXIR_VERSION=1.16.0
15ARG OTP_VERSION=26.2.1
16ARG DEBIAN_VERSION=bullseye-20231009-slim
17
18ARG BUILDER_IMAGE="hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
19ARG RUNNER_IMAGE="debian:${DEBIAN_VERSION}"
20
21FROM ${BUILDER_IMAGE} as builder
22
23# install build dependencies
24RUN apt-get update -y && apt-get install -y build-essential git \
25 && apt-get clean && rm -f /var/lib/apt/lists/*_*
26
27# prepare build dir
28WORKDIR /app
29
30# install hex + rebar
31RUN mix local.hex --force && \
32 mix local.rebar --force
33
34# set build ENV
35ENV MIX_ENV="prod"
36
37# install mix dependencies
38COPY mix.exs mix.lock ./
39RUN mix deps.get --only $MIX_ENV
40RUN mkdir config
41
42# copy compile-time config files before we compile dependencies
43# to ensure any relevant config change will trigger the dependencies
44# to be re-compiled.
45COPY config/config.exs config/${MIX_ENV}.exs config/
46RUN mix deps.compile
47
48COPY priv priv
49
50COPY lib lib
51
52COPY assets assets
53
54# compile assets
55RUN mix assets.deploy
56
57# Compile the release
58RUN mix compile
59
60# Changes to config/runtime.exs don't require recompiling the code
61COPY config/runtime.exs config/
62
63COPY rel rel
64RUN mix release
65
66# start a new build stage so that the final image will only contain
67# the compiled release and other runtime necessities
68FROM ${RUNNER_IMAGE}
69
70RUN apt-get update -y && \
71 apt-get install -y libstdc++6 openssl libncurses5 locales ca-certificates \
72 && apt-get clean && rm -f /var/lib/apt/lists/*_*
73
74# Set the locale
75RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen && locale-gen
76
77ENV LANG en_US.UTF-8
78ENV LANGUAGE en_US:en
79ENV LC_ALL en_US.UTF-8
80
81WORKDIR "/app"
82RUN chown nobody /app
83
84# set runner ENV
85ENV MIX_ENV="prod"
86
87# Only copy the final release from the build stage
88COPY --from=builder --chown=nobody:root /app/_build/${MIX_ENV}/rel/elixir_blonk ./
89
90USER nobody
91
92# If using a startup script, copy it over
93# COPY --from=builder --chown=nobody:root /app/bin/server /app/bin/migrate ./bin/
94
95CMD ["/app/bin/server"]
96