version: "3.1"
services:
    web:
        image: registry.gitlab.com/xxxx/xxxx:latest
        deploy:
             replicas: 2
        ports:
             - "8888:80"
    mysql:
        image: mysql:latest
        environment:
           MYSQL_ROOT_PASSWORD: password
           MYSQL_USER: user
           MYSQL_PASS: password
        ports:
             - "8889:3306"
        volumes:
           - mysql-data:/var/lib/mysql
volumes:
   mysql-data:

docker stack deploy --compose-file docker-compose.yml xxxx-learn