docker-compose.yml

 version: '2'

 services:
         db:        
           image: mysql
           restart: always
           expose:
            - 3306
           environment:
                MYSQL_ROOT_PASSWORD: teste123
                MYSQL_USER: wordpress
                MYSQL_PASSWORD: wordpress
                MYSQL_DATABASE: wordpress

         wordpress:
           image: wordpress
           restart: always
           ports:
            - 8080:80
           environment:
                WORDPRESS_DB_HOST: mysql
                WORDPRESS_DB_USER: wordpress
                WORDPRESS_DB_PASSWORD: wordpress
           links:
            - db:mysql