code: func (c *container) stop(vm *VirtualMachine) {
  	if c.id == "" {
  		return
  	}
  
  	cmd := exec.Command("docker", "stop", c.id)
  	err := cmd.Run()
  	if err != nil {
  		log.Printf("%s %s: %s", vm.Name, cmd.Args, err)
  	}
  }
docs: // stop the container (if any) for the given vm.