First, config the distillery with:
# rel/config.exs ... release :void do set version: "0.1.0" set applications: [ :runtime_tools, void: :permanent, ] set commands: [ "migrate": "rel/commands/migrate.sh", "seed": "rel/commands/seed.sh" ] end release :void_web do set version: "0.1.0" set applications: [ :runtime_tools, void: :permanent, void_web: :permanent ] end ... Then use the following Dockerfile which take an arg app_name, then build the specific umbrella app for you.
# Dockerfile FROM elixir:1.4 # fixes bad trap when running release in foreground, built with distillery # https://github.com/bitwalker/distillery/issues/18 RUN echo 'dash dash/sh boolean false' | debconf-set-selections RUN dpkg-reconfigure -phigh dash RUN curl -sL https://deb.nodesource.com/setup_6.x | bash - && apt-get install -y nodejs RUN apt-get install -y build-essential # ENVs ENV MIX_ENV=prod # Define path ENVs ENV BUILD_DIR /build RUN mkdir $BUILD_DIR ENV APP_HOME /app RUN mkdir $APP_HOME ## Build WORKDIR $BUILD_DIR # Install Elixir Deps RUN mix local.hex --force \ && mix local.rebar --force # Copying mix.exs COPY mix.exs mix.lock ./ COPY apps/void/mix.exs apps/void/ COPY apps/void_web/mix.exs apps/void_web/ # Fetch deps COPY deps deps RUN mix deps.get # Copying Config files COPY config ./config RUN mkdir -p apps/void/config COPY apps/void/config/* apps/void/config/ RUN mkdir -p apps/void_web/config COPY apps/void_web/config/* apps/void_web/config/ # Compile everything RUN mix compile # Web Assets COPY apps/void_web/assets apps/void_web/assets RUN cd apps/void_web/assets/ \ && npm install \ && ./node_modules/brunch/bin/brunch build --production RUN cd apps/void_web && mix phx.digest ADD . . ## - Release tasks, build the $app_name application. ARG app_name RUN mix release --name=$app_name --env=prod --executable # Copy releases RUN cp ./_build/prod/rel/$app_name/bin/$app_name.run $APP_HOME/ \ && rm -rf $BUILD_DIR WORKDIR $APP_HOME # Set entry point RUN echo "./$app_name.run \$1" > entrypoint.sh ENTRYPOINT ["sh", "entrypoint.sh"] CMD foreground Using with docker-compose
version: "3" volumes: db-volume: driver: local services: db: image: "postgres:9.4" expose: - "5432" environment: POSTGRES_USER: civic POSTGRES_PASSWORD: civic POSTGRES_DB: civic_prod volumes: - db-volume:/var/lib/postgresql migrator: build: context: "." dockerfile: Dockerfile args: app_name: void environment: MIX_ENV: "prod" DATABASE_URL: postgres://civic:civic@db/civic_prod depends_on: - db command: migrate web: build: context: "." dockerfile: Dockerfile args: app_name: void_web environment: MIX_ENV: "prod" PORT: 4000 DATABASE_URL: postgres://civic:civic@db/civic_prod depends_on: - db - migrator command: foreground ports: - "4000:4000" 
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