docker-compose.yml

version: '3.7'

services: # the different images that will be running as containers
  db: # service name
    image: postgres:11-alpine # image name of the postgres database. during build, this will be pulled from dockerhub and a container spun up from it
    environment:
      - "POSTGRES_HOST_AUTH_METHOD=trust"
      - POSTGRES_DB=${DB_NAME}
      - PGPORT=${DB_PORT}
      - POSTGRES_USER=${DB_USER}
      - POSTGRES_PASSWORD=${DB_PASSWORD}
    ports:
      - "${DB_PORT}:${DB_PORT}"
    volumes:
      - postgres_data:/var/lib/postgresql/data/
    restart: "on-failure"

  web: # service name
    # platform defined to fix python packages installation issues on Apple Silicon
    platform: linux/amd64
    # allows one to attach the terminal of a running container for debugging
    stdin_open: true
    tty: true
    build: . # build the image for the web service from the dockerfile in parent directory.
    volumes:
      - .:/app # map data and files from parent directory in host to plio directory in docker container
    env_file: # file where env variables are stored. Used as best practice so as not to expose secret keys
      - .env # name of the env file
    image: plio-backend # name of the image
    ports:
      - "${APP_PORT}:${APP_PORT}"
    restart: "on-failure"
    depends_on: # cannot start if db service is not up and running
      - db

  redis: # service name
    image: "redis:5" # image name of the redis database. during build, this will be pulled from dockerhub and a container spun up from it
    ports:
      - "6379:6379" # default redis port
    depends_on:
      - web # cannot start if web service is not up and running

volumes:
  postgres_data: