version: '2.1'
services:
  db:
    build: ./backend
    restart: always
    ports:
      - "3306:3306"
    volumes:
      - /var/lib/mysql
    environment:
      - MYSQL_ROOT_PASSWORD=123
      - MYSQL_DATABASE=demo
      - MYSQL_USER=user
      - MYSQL_PASSWORD=123
  php:
    build: ./frontend
    ports:
      - "80:80"
    volumes:
      - ./frontend:/var/www/html
    links:
      - db

FROM php:7.2-apache

# Enable mysqli to connect to database
RUN docker-php-ext-install mysqli

# Document root
WORKDIR /var/www/html

COPY . /var/www/html/

FROM mysql:5.7

COPY ./demo.sql /docker-entrypoint-initdb.d

$ docker-compose up
Creating phpsampleapp_db_1  ... done
Creating phpsampleapp_db_1  ...
Creating phpsampleapp_php_1 ...