Elixir & Phoenix on Docker for development

README.md

• The container expect your local user has uid:gid set as 1000
  • so when you run a command the files generated are not root owned
• you can run any command like:
  • docker-compose run phx mix ecto.create
  • docker-compose run phx iex -S mix phx.server
  • docker-compose run phx mix phx.new . --app myproj
• then run the server with docker-compose up

docker-compose.yaml

version: "3.2"

services:
  phx:
    image: myproj:latest
    build: .
    volumes:
      - type: bind
        source: .
        target: /app
    ports:
      - "4000:4000"
    depends_on:
      - db
    command: mix phx.server

  db:
    image: postgres:9.6
    environment:
      - POSTGRES_DB
      - POSTGRES_USER
      - POSTGRES_PASSWORD
      - POSTGRES_HOST_AUTH_METHOD=trust
    ports:
      - "5432:5432"
    volumes:
      - pgvol:/var/lib/postgresql/data

  # mailhog:
  #   image: mailhog/mailhog:latest
  #   ports:
  #     - "1025:1025"
  #     - "1080:1080"
  #     - "8025:8025"

volumes:
  pgvol:

Dockerfile

FROM elixir:1.10

ENV \
  PHX_VER=1.5.1 \
  NODE_VER=12.x \
  APP=/app HOME=/app \
  PKGS="inotify-tools postgresql-client git"

RUN groupadd -g 1000 appuser \
  && useradd -r -u 1000 -g appuser appuser \
  && mkdir -p $APP \
  && chown appuser:appuser $APP

RUN \
  curl -sL https://deb.nodesource.com/setup_$NODE_VER | bash - \
  && curl -sL https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
  && echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list \
  && apt-get update -qq \
  && apt-get install -qq $PKGS \
  && apt-get install -qq nodejs yarn \
  && apt-get clean \
  && rm -r /var/lib/apt/lists /var/cache/apt/archives

USER appuser
WORKDIR $APP

RUN \
  mix local.hex --force \
  && mix local.rebar --force \
  && mix archive.install hex phx_new $PHX_VER --force

EXPOSE 4000
CMD ["iex"]