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[Xu Han Peng <pengxuhan@xxxxxxxxx>]

Public bug reported:

Nove raise "Neutron error: quota exceeded" when neutron state code is
409 (conflict):

https://github.com/openstack/nova/blob/2014.1.1/nova/network/neutronv2/api.py#L187

The real cause of 409 in Neutron can be OverQuota or
IpAddressGenerationFailure(no more IP available from allocation pool).
So we need to raise the error from nova side more precisely to reflect
the real error.

This can be done to check the exception defined in neutron client:

OverQuotaClient:
https://github.com/openstack/python-neutronclient/blob/master/neutronclient/common/exceptions.py#L142

IpAddressGenerationFailureClient:
https://github.com/openstack/python-neutronclient/blob/master/neutronclient/common/exceptions.py#L152

** Affects: nova
     Importance: Undecided
     Assignee: Xu Han Peng (xuhanp)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Xu Han Peng (xuhanp)

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https://bugs.launchpad.net/bugs/1331353

Title:
  nova reports Neutron port OverQuota error when the real problem from
  Neutron is IpAddressGenerationFailure

Status in OpenStack Compute (Nova):
  New

Bug description:
  Nove raise "Neutron error: quota exceeded" when neutron state code is
  409 (conflict):

  https://github.com/openstack/nova/blob/2014.1.1/nova/network/neutronv2/api.py#L187

  The real cause of 409 in Neutron can be OverQuota or
  IpAddressGenerationFailure(no more IP available from allocation pool).
  So we need to raise the error from nova side more precisely to reflect
  the real error.

  This can be done to check the exception defined in neutron client:

  OverQuotaClient:
  https://github.com/openstack/python-neutronclient/blob/master/neutronclient/common/exceptions.py#L142

  IpAddressGenerationFailureClient:
  https://github.com/openstack/python-neutronclient/blob/master/neutronclient/common/exceptions.py#L152

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