Elixir Umbrella App Dockerfile

Dockerfile

FROM elixir:1.11.1-alpine AS build

# install build dependencies
RUN apk add --no-cache build-base npm git

# prepare build dir
WORKDIR /app

# install hex + rebar
RUN mix local.hex --force && \
    mix local.rebar --force

# set build ENV
ENV MIX_ENV=prod

# copy umbrella apps
COPY apps/my_app apps/my_app
COPY apps/my_app_web/lib apps/my_app_web/priv apps/my_app_web/test apps/my_app_web/mix.exs apps/my_app_web/

# install mix dependencies
COPY mix.exs mix.lock ./
COPY config config
RUN mix do deps.get, deps.compile

# build assets
COPY apps/my_app_web/assets/package.json apps/my_app_web/assets/package-lock.json ./apps/my_app_web/assets/
RUN npm --prefix ./apps/my_app_web/assets ci --progress=false --no-audit --loglevel=error

COPY apps/my_app_web/priv apps/my_app_web/assets apps/my_app_web/assets/
RUN npm run --prefix ./apps/my_app_web/assets deploy
RUN mix phx.digest

# compile and build release
COPY . .
RUN mix do compile, release

# prepare release image
FROM alpine:3.9 AS app
RUN apk add --no-cache openssl ncurses-libs

WORKDIR /app

RUN chown nobody:nobody /app

USER nobody:nobody

COPY --from=build --chown=nobody:nobody /app/_build/prod/rel/my_app_web ./

ENV HOME=/app

CMD ["bin/my_app_web", "start"]