Содержимое файла docker-compose.yml:

version: '3.1'

services:
   db:
     image: mysql:5.7
     volumes:
       - db_data:/var/lib/mysql
     networks:
       mysql_internal:
         aliases: ["db"]
     environment:
       MYSQL_ROOT_PASSWORD_FILE: /run/secrets/db_root_password
       MYSQL_DATABASE: wordpress
       MYSQL_USER: wordpress
       MYSQL_PASSWORD_FILE: /run/secrets/db_password
     secrets:
       - db_root_password
       - db_password

   wordpress:
     depends_on:
       - db
     image: wordpress:latest
     networks:
       mysql_internal:
         aliases: ["wordpress"]
       wordpress_public:
     ports:
       - "8001:80"
     environment:
       WORDPRESS_DB_HOST: db:3306
       WORDPRESS_DB_USER: wordpress
       WORDPRESS_DB_PASSWORD_FILE: /run/secrets/db_password
     secrets:
       - db_password

secrets:
   db_password:
     file: db_password.txt
   db_root_password:
     file: db_root_password.txt

volumes:
    db_data:
networks:
  mysql_internal:
    driver: "overlay"
    internal: true
  wordpress_public:
    driver: "overlay"