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[Matt Riedemann <mriedem@xxxxxxxxxx>]

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

** Changed in: nova/mitaka
       Status: New => Confirmed

** Changed in: nova/mitaka
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1592167

Title:
  Deleted keypair causes metadata failure

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) mitaka series:
  Confirmed

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

  If a user deletes a keypair that was used to create an instance, that
  instance receives HTTP 400 errors when attempting to get metadata via
  http://169.254.169.254/openstack/latest/meta_data.json.

  This causes problems in the instance when cloud-init fails to retrieve
  the OpenStack datasource.

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

  1. Create instance with SSH keypair defined.
  2. Delete SSH keypair
  3. Attempt 'curl http://169.254.169.254/openstack/latest/meta_data.json' from the instance

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

  Instance receives metadata from
  http://169.254.169.254/openstack/latest/meta_data.json

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

  Instance receives HTTP 400 error.  Additionally, Ubuntu Cloud Image
  instances will fail back to the ec2 datasource and re-generate Host
  SSH keys.

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

  Nova:       2015.1.4.2
  Hypervisor: Libvirt + KVM
  Storage:    Ceph
  Network:    Liberty Neutron ML2+OVS

  
  Logs
  ====

  [req-a8385839-6993-4289-96dc-1714afe82597 - - - - -] FaultWrapper error
  Traceback (most recent call last):
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/nova/api/ec2/__init__.py", line 93, in __call__
      return req.get_response(self.application)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/webob/request.py", line 1299, in send
      application, catch_exc_info=False)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/webob/request.py", line 1263, in call_application
      app_iter = application(self.environ, start_response)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/webob/dec.py", line 130, in __call__
      resp = self.call_func(req, *args, **self.kwargs)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/webob/dec.py", line 195, in call_func
      return self.func(req, *args, **kwargs)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/nova/api/ec2/__init__.py", line 105, in __call__
      rv = req.get_response(self.application)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/webob/request.py", line 1299, in send
      application, catch_exc_info=False)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/webob/request.py", line 1263, in call_application
      app_iter = application(self.environ, start_response)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/webob/dec.py", line 130, in __call__
      resp = self.call_func(req, *args, **self.kwargs)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/webob/dec.py", line 195, in call_func
      return self.func(req, *args, **kwargs)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/nova/api/metadata/handler.py", line 137, in __call__
      data = meta_data.lookup(req.path_info)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/nova/api/metadata/base.py", line 418, in lookup
      data = self.get_openstack_item(path_tokens[1:])
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/nova/api/metadata/base.py", line 297, in get_openstack_item
      return self._route_configuration().handle_path(path_tokens)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/nova/api/metadata/base.py", line 491, in handle_path
      return path_handler(version, path)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/nova/api/metadata/base.py", line 316, in _metadata_as_json
      self.instance.key_name)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/nova/objects/base.py", line 163, in wrapper
      result = fn(cls, context, *args, **kwargs)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/nova/objects/keypair.py", line 60, in get_by_name
      db_keypair = db.key_pair_get(context, user_id, name)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/nova/db/api.py", line 937, in key_pair_get
      return IMPL.key_pair_get(context, user_id, name)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/nova/db/sqlalchemy/api.py", line 233, in wrapper
      return f(*args, **kwargs)
    File "/opt/cat/openstack/nova/local/lib/python2.7/site-packages/nova/db/sqlalchemy/api.py", line 2719, in key_pair_get
      raise exception.KeypairNotFound(user_id=user_id, name=name)
  KeypairNotFound: Keypair keypair_name not found for user ffffffffffffffffffffffffffffffff

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