docker-compose example

.env

# https://github.com/bkeepers/dotenv

COMPOSE_PROJECT_NAME=my_app

REDIS_URL=redis://redis:6379

PGHOST=db
PGUSER=postgres
PGPASSWORD=postgres

docker-compose.yml

version: "3.8"
# https://docs.docker.com/docker-for-mac/osxfs/
services:
  redis:
    # screen ~/Library/Containers/com.docker.docker/Data/vms/0/tty
    # echo never > /sys/kernel/mm/transparent_hugepage/enabled
    # echo never > /sys/kernel/mm/transparent_hugepage/defrag
    container_name: redis
    image: redis:6
    volumes:
      - redis:/data

  db:
    env_file: .env
    container_name: db
    image: postgres:11
    environment:
      - POSTGRES_USER=$PGUSER
      - POSTGRES_PASSWORD=$PGPASSWORD
    volumes:
      - postgres:/var/lib/postgresql/data

  traefik:
    image: traefik:v2.3
    container_name: traefik
    command:
      #- --log.level=DEBUG
      - --api.insecure=true
      - --providers.docker=true
      - --providers.docker.exposedbydefault=false
      - --entrypoints.web.address=:80
    ports:
      - 80:80
      - 8080:8080
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock:ro
      
  my_service:
    env_file: .env
    container_name: my-service
    build: .
    volumes:
      - .:/usr/src/app:delegated
    stdin_open: true
    tty: true
    environment:
      - DATABASE_URL=postgresql://${PGUSER}:${PGPASSWORD}@${PGHOST}/my_service_development
    depends_on:
      - db
      - redis
    ports:
      - 1111:1111
    labels:
      - traefik.enable=true
      - traefik.http.routers.my_service.rule=Host(`my_service.my_app.localhost`)
      - traefik.http.routers.my_service.entrypoints=web
      
volumes:
  postgres: {}
  redis: {}
  

Dockerfile

FROM whatever

LABEL maintainer="Brett Dudo <brett@dudo.io>"

# Install dependencies
RUN apt-get update -qq

ENV HOME /usr/src/app
WORKDIR $HOME

# Cleanup
RUN apt-get clean && \
    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

ENV LANG C.UTF-8

ADD . ./

EXPOSE 1111

# start app
USER 1000
ENTRYPOINT ["do"]
CMD ["the", "thing"]