Elixir Phoenix Distillery Multi-Stage Dockerfile

Dockerfile

# Assets compilation
FROM aparedes/alpine-node-yarn as node

## Node modules
COPY ./deps /tmp/deps
COPY ./assets/package.json /tmp/deps
COPY ./assets/package-lock.json /tmp/deps
WORKDIR /tmp/deps
RUN yarn

## Assets compilation
COPY ./assets /tmp/assets
RUN cp -R /tmp/deps/node_modules /tmp/assets
WORKDIR /tmp/assets
RUN ./node_modules/.bin/brunch build --production

# Distillery release
FROM bitwalker/alpine-elixir as distillery

ARG APP_NAME=web
ENV MIX_ENV prod

COPY . /app
COPY --from=node /tmp/priv/static /app/priv/static

WORKDIR /app
RUN mix phx.digest && mix release --env=prod
RUN mkdir target
RUN tar xzf ./_build/prod/rel/$APP_NAME/releases/*/$APP_NAME.tar.gz -C ./target

# Final image
FROM alpine:latest

RUN apk add --update openssl bash && \
    rm -rf /var/cache/apk/*

COPY --from=distillery /app/target /app

ENV PORT 4000

WORKDIR /app
CMD ["./bin/web", "foreground", "--sname", "web", "--cookie", "secret"]