Elixir 1.9 example Dockerfile

.dockerignore

/_build/

# If you run "mix test --cover", coverage assets end up here.
/cover/

# The directory Mix downloads your dependencies sources to.
/deps/

# Where 3rd-party dependencies like ExDoc output generated docs.
/doc/

# Ignore .fetch files in case you like to edit your project deps locally.
/.fetch

# If the VM crashes, it generates a dump, let's ignore it too.
erl_crash.dump

# Also ignore archive artifacts (built via "mix archive.build").
*.ez

/test/

Dockerfile

FROM elixir:1.9.1 AS app_builder
WORKDIR /app
ENV MIX_ENV=prod
COPY mix.*
RUN mix do local.hex --force, local.rebar --force, deps.get, deps.compile
COPY . .
RUN mix do phx.digest, release app
# ---- Release Stage ----
FROM debian:stretch AS app
EXPOSE 4000
ENV LANG=C.UTF-8
RUN apt-get update && apt-get install -y openssl
RUN useradd --create-home app
WORKDIR /app
COPY --from=app_builder /app/_build/prod/rel/app ./

ENTRYPOINT ["/app/bin/app"]