docker/swarm/service/docker.yml

parameters:
  _param:
    docker_image_registry: registry:2
  docker:
    client:
      service:
        registry:
          replica: 3
          environment:
            REGISTRY_HTTP_SECRET: ${_param:docker_registry_http_secret}
          restart:
            condition: any
          image: ${_param:docker_image_registry}
          ports:
            - 15000:5000
          volume:
            site:
              type: bind
              source: /srv/volumes/registry
              destination: /var/lib/registry