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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/queens
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1744032

Title:
  Hyper-V: log warning on PortBindingFailed exception

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) queens series:
  In Progress

Bug description:
  Description
  ===========

  When spawning an Hyper-V instance with NICs having the vif_type
  "hyperv", neutron will fail to bind the port to the Hyper-V host if
  the neutron server doesn't have the "hyperv" mechanism driver
  installed and configured, resulting in a PortBindingFailed exception
  on the nova-compute side.

  When this exception is encountered, the logs will say to check the
  neutron-server logs, but the problem and its solution are not obvious
  or clear, resulting in plenty of questions / reports, all having the
  same solution: install networking-hyperv and configure neutron-server
  to use the "hyperv" mechanism_driver.

  
  Steps to reproduce
  ==================

  1. Do not configure neutron-server with a "hyperv" mechanism_driver.
  2. Spawn an instance having NICs with the vif_type "hyperv".

  
  Expected result
  ===============

  PortBindingFailed, and a clear explanation and / or solution for it.

  After the execution of the steps above, what should have
  happened if the issue wasn't present?

  Actual result
  =============

  PortBindingFailed, telling users to check the neutron-server logs,
  which doesn't contain the obvious problem / solution.

  
  Environment
  ===========

  Hyper-V compute nodes, with neutron-hyperv-agent agent.
  Any OpenStack version.

  Logs & Configs
  ==============

  Logs: http://paste.openstack.org/show/646888/

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