The Docker Stack functionality, is included with the Docker engine. You don’t need to install additional packages to use it Deploying docker stacks is part of the swarm mode. It supports the same kinds of compose files, but the handling happens in Go code, inside of the Docker Engine.

#stack.yaml

version: ‘3.3’

services:

   db:

     image: mysql:5.7

     volumes:

       – db_data:/var/lib/mysql

     restart: always

     environment:

       MYSQL_ROOT_PASSWORD: somewordpress

       MYSQL_DATABASE: wordpress

       MYSQL_USER: wordpress

       MYSQL_PASSWORD: wordpress

   wordpress:

     depends_on:

       – db

     image: wordpress:latest

     ports:

       – “8000:80”

     restart: always

     environment:

       WORDPRESS_DB_HOST: db:3306

       WORDPRESS_DB_USER: wordpress

       WORDPRESS_DB_PASSWORD: wordpress

       WORDPRESS_DB_NAME: wordpress

volumes:

    db_data: {}