version: '2'
services:
   db:
     image: mysql:5.7
     volumes:
       - "./.data/db:/var/lib/mysql"
     restart: always
     environment:
       MYSQL_ROOT_PASSWORD: wordpress
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress
       MYSQL_PASSWORD: wordpress
   wordpress:
     depends_on:
       - db
     image: wordpress:latest
     links:
       - db
     ports:
       - "8000:80"
     networks:
       - ipv4_address: 172.17.0.5
     restart: always
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_PASSWORD: wordpress

version: '2'
    services:
       db:
         image: mysql:5.7
         volumes:
           - "./.data/db:/var/lib/mysql"
         restart: always
         environment:
           MYSQL_ROOT_PASSWORD: wordpress
           MYSQL_DATABASE: wordpress
           MYSQL_USER: wordpress
           MYSQL_PASSWORD: wordpress

   wordpress:
     depends_on:
       - db
     image: wordpress:latest
     links:
       - db
     ports:
       - "8001:80"
     networks:
       - ipv4_address: 172.17.0.6
     restart: always
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_PASSWORD: wordpress

version: '2'

services:
  nginx:
    ...
    external_links:
      - your_project1_wordpress1_1:wordpress1
      - your_other_project2_wordpress2_1:wordpress2
    networks:
      - default
      - your_project1_default
      - your_other_project2_defaul



networks:
  your_project1_default:
    external: true
  your_other_project2_default:
    external: true