version: '3'
services:
  db:
    image: mysql:5.7
    restart: always
    environment:
      MYSQL_DATABASE: "$MYSQL_DB_DNAME"
      # So you don't have to use root, but you can if you like
      MYSQL_USER: "$MYSQL_DB_USERNAME"
      # You can use whatever password you like
      MYSQL_PASSWORD: "$MYSQL_DB_PASSWORD"
      # Password for root access
      MYSQL_ROOT_PASSWORD: "$MYSQL_DB_PASSWORD"
    ports:
      # <Host PORT> : < MySQL Port running inside container>
      #Host port is used for outside communication
      #MYSQL internal port used for Networked service-to-service communication
      - '3000:3306'
    volumes:
      - my-db:/var/lib/mysql
  web-app:
    depends_on:
      - db
    restart: on-failure
    links: 
      - "db:db"
    environment:
      MYSQL_DB_HOST: ${MYSQL_DB_HOST}
      MYSQL_DB_PORT: ${MYSQL_DB_PORT}
      MYSQL_DB_USERNAME: ${MYSQL_DB_USERNAME}
      MYSQL_DB_PASSWORD: ${MYSQL_DB_PASSWORD}
      MYSQL_DB_DNAME: ${MYSQL_DB_DNAME}
    build: 
      context:  .
      dockerfile: Dockerfile
    ports:
      - "8080:8080"
## Names our volume
volumes:
  my-db: