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[Gary Kotton <1255609@xxxxxxxxxxxxxxxxxx>]

** Changed in: nova
   Importance: Medium => High

** Also affects: openstack-vmwareapi-team
   Importance: Undecided
       Status: New

** Changed in: openstack-vmwareapi-team
   Importance: Undecided => High

** Tags added: havana-backport-potential

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Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1255609

Title:
  VMware: possible collision of VNC ports

Status in OpenStack Compute (Nova):
  In Progress
Status in The OpenStack VMwareAPI subTeam:
  New

Bug description:
  We assign VNC ports to VM instances with the following method:

  def _get_vnc_port(vm_ref):
      """Return VNC port for an VM."""
      vm_id = int(vm_ref.value.replace('vm-', ''))
      port = CONF.vmware.vnc_port + vm_id % CONF.vmware.vnc_port_total
      return port

  the vm_id is a simple counter in vSphere which increments fast and
  there is a chance to get the same port number if the vm_ids are equal
  modulo vnc_port_total (10000 by default).

  A report was received that if the port number is reused you may get
  access to the VNC console of another tenant. We need to fix the
  implementation to always choose a port number which is not taken or
  report an error if there are no free ports available.

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