Sample Docker compose install wordpress & mysql

version: '3.1'

services:
  db:
    image: mysql:5.7
    container_name: db_mysql
    restart: always
    #env_file: .env
    environment:
      MYSQL_DATABASE: exampledb
      MYSQL_USER: admin
      MYSQL_PASSWORD: admin
      MYSQL_RANDOM_ROOT_PASSWORD: '1'
    volumes:
      - db:/var/lib/mysql
    networks:
      - common
  wordpress:
    depends_on:
      - db
    image: wordpress
    container_name: wordpress_container
    restart: always
    ports:
      - 8080:80
    #env_file: .env
    environment:
      WORDPRESS_DB_HOST: db
      WORDPRESS_DB_USER: admin
      WORDPRESS_DB_PASSWORD: admin
      WORDPRESS_DB_NAME: exampledb
    volumes:
      - wordpress:/var/www/html
      - 
    networks:
      - common
volumes:
  wordpress:
  db:

networks:
  common:
    driver: bridge

Then using:

docker-compose up.