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priv/templates/phx.gen.release/Dockerfile.eex

# This file is based on these images:
#
# - https://hub.docker.com/r/hexpm/elixir/tags - for the builder image
# E.g.: docker.io/hexpm/elixir:<%= elixir_vsn %>-erlang-<%= otp_vsn %>-debian-<%= debian %>-<%= debian_vsn %>-slim
# - https://hub.docker.com/_/debian/tags?name=<%= debian %>-<%= debian_vsn %>-slim - for the runner image
# E.g.: docker.io/debian:<%= debian %>-<%= debian_vsn %>-slim
#
# Find builder and runner images on Docker Hub or on Hex's Build Server (Bob).
# We recommend using Bob's Web UI to find recent tags:
#
# - https://bob.hex.pm/docker
#
# We suggest using the same Debian version for both the builder and runner images.
#
# We suggest Debian/Ubuntu instead of Alpine to avoid production compatibility issues
# (such as DNS resolution failures, and dynamically linked NIFs/precompiled binaries).
#
# For finding packages in Debian, search on https://packages.debian.org/.
ARG ELIXIR_VERSION=<%= elixir_vsn %>
ARG OTP_VERSION=<%= otp_vsn %>
ARG DEBIAN_VERSION=<%= debian %>-<%= debian_vsn %>-slim
ARG BUILDER_IMAGE="docker.io/hexpm/elixir:${ELIXIR_VERSION}-erlang-${OTP_VERSION}-debian-${DEBIAN_VERSION}"
ARG RUNNER_IMAGE="docker.io/debian:${DEBIAN_VERSION}"
FROM ${BUILDER_IMAGE} AS builder
# install build dependencies
RUN apt-get update \
&& apt-get install -y --no-install-recommends build-essential git \
&& rm -rf /var/lib/apt/lists/*
# prepare build dir
WORKDIR /app
# install hex + rebar
RUN mix local.hex --force \
&& mix local.rebar --force
# set build ENV
ENV MIX_ENV="prod"
# install mix dependencies
COPY mix.exs mix.lock ./
RUN mix deps.get --only $MIX_ENV
RUN mkdir config
# copy compile-time config files before we compile dependencies
# to ensure any relevant config change will trigger the dependencies
# to be re-compiled.
COPY config/config.exs config/${MIX_ENV}.exs config/
RUN mix deps.compile
<%= if assets_dir_exists? do %>
RUN mix assets.setup
<% end %>
COPY priv priv
COPY lib lib
# Compile the release
RUN mix compile
<%= if assets_dir_exists? do %>
COPY assets assets
# compile assets
RUN mix assets.deploy
<% end %>
# Changes to config/runtime.exs don't require recompiling the code
COPY config/runtime.exs config/
COPY rel rel
RUN mix release
# start a new build stage so that the final image will only contain
# the compiled release and other runtime necessities
FROM ${RUNNER_IMAGE} AS final
RUN apt-get update \
&& apt-get install -y --no-install-recommends libstdc++6 openssl libncurses6 locales ca-certificates \
&& rm -rf /var/lib/apt/lists/*
# Set the locale
RUN sed -i '/en_US.UTF-8/s/^# //g' /etc/locale.gen \
&& locale-gen
ENV LANG=en_US.UTF-8
ENV LANGUAGE=en_US:en
ENV LC_ALL=en_US.UTF-8
WORKDIR "/app"
RUN chown nobody /app
# set runner ENV
ENV MIX_ENV="prod"
# Only copy the final release from the build stage
COPY --from=builder --chown=nobody:root /app/_build/${MIX_ENV}/rel/<%= otp_app %> ./
USER nobody
# If using an environment that doesn't automatically reap zombie processes, it is
# advised to add an init process such as tini via `apt-get install`
# above and adding an entrypoint. See https://github.com/krallin/tini for details
# ENTRYPOINT ["/tini", "--"]
CMD ["/app/bin/server"]