temp.yml

cat <<EOF >create-stack.yml
version: "3"
services:
  nginx:
    image: nginx:latest
    ports:
      - 80:80
      - 443:443
    networks:
      - ${network}
    deploy:
      replicas: 2
  tomcat:
    image: tomcat:8.0-jre8
    ports:
      - "8080:8080"
    networks:
      - ${network}
    deploy:
      replicas: 1
  mysql:
    image: mysql:5.7
    environment:
      MYSQL_DATABASE: 'db'
      MYSQL_USER: 'user'
      MYSQL_PASSWORD: 'password'
      MYSQL_ROOT_PASSWORD: 'password'
    ports:
      - '3306:3306'
    networks:
      - ${network}
    deploy:
      replicas: 1
networks:
  ${network}:
    external: true

EOF