docker-compose.yml

version: '3.8'

services:
  pg:
    image: postgres:${PG_VERSION:- 9.6-alpine}
    environment:
      - POSTGRES_URL
    volumes: # create a bind mount to pass file that executes tablea creation by SQL
      - ./sql/create_table.sql:/docker-entrypoint-initdb.d/create_table.sql
      - pgdata:/var/lib/postgresql/data
      - .psqlrc:/root/.psqlrc:ro
      - ./log:/root/log:cached
    ports:
      - 5432

  webapp: 
    image: ndrean/webapp:latest
    build:
      context: .
      dockerfile: Dockerfile
      args:
        CACHE_IMAGE: ndrean/webapp:gem-cache
    # tmpfs: 
    #   - /tmp # ?? ot volumes: - type:tmpfs - src,-dst...??
    volumes: # to mount bind the code (and get the db logs)
      - .:/usr/app:cached
      # - bundle:/usr/local/bundle:ro

      # below test by monting docker socket of the host to get # count containers
      # - /var/run/docker.sock:/var/run/docker.sock
      
    # ports: # removed to be able to run multiple instances of the app: nginx L.B.
    #   - 9292:9292
    depends_on: 
      - pg
    environment:
      - POSTGRES_URL
      # - PIDFILE
    

  webserver:
    image: ndrean/webserver:latest
    build: # when the context is provided, we build the image
      context: ./webserver
      dockerfile: Dockerfile
    depends_on:
      - webapp
    volumes: # to mount bind the static files for Nginx to serve instead of Puma
      - ./public:/usr/share/nginx/html:ro
      # - ./tmp/cache:/var/cache/nginx/mycache
    environment:
      - PROXY_UPSTREAM
    ports:
      - 8080:8080
    # command: nginx -g 'daemon off;' # override the one in Dockerfile
    # entrypoint: 


  # client:
  #   image:
  #   build: 
  #     context: ./client
  #     dockerfile: Dockerfile
  #   environment:
  #     - POSTGRES_DB
  #     - POSTGRES_PASSWORD
  #     - POSTGRES_USER
  #     - POSTGRES_HOST

volumes:
  pgdata:
  bundle: