vol issue with placement

gistfile1.txt

my-service:
  environment:
    TZ: Australia/Melbourne
  labels:
    io.rancher.scheduler.global: 'true'
    io.rancher.container.pull_image: always
    io.rancher.container.start_once: 'true'
    io.rancher.service.hash: 91bdc4dfc7e67786522a3e7aefb2af0f502e14c4
    io.rancher.container.network: 'true'
    io.rancher.scheduler.affinity:host_label_ne: log_host=true
  tty: true
  image: registry.foo.bar/foobar:latest
  volumes:
  - myvol:/myvol/
  stdin_open: true