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Hello list,

I have a strange issue I'd like to report here, I'm not sure whether  
this could be a bug or a config issue on my side.

The environment has developed from Liberty to Ocata over the last 3  
years, backend for glance, cinder and nova is Ceph since Mitaka  
release. So according to [1] these two config options should be set to  
true.

> show_multiple_locations = True
> show_image_direct_url = True

This setup has worked just fine, live snapshots of nova worked as  
expected. Last year the environment was upgraded to Ocata  
(successfully), and some time later I decided to clean up the configs,  
I set show_multiple_locations to false, also because glance reports:

> Option "show_multiple_locations" from group "DEFAULT" is deprecated  
> for removal.  Its value may be silently ignored in the future.

Since this change the nova live snapshots stopped working, resulting  
in this stack trace:

---cut here---
  [req-5bd2fef2-2155-4a89-b346-e20fb0b0d14a  
df7b63e69da3b1ee2be3d79342e7992f3620beddbdac7768dcb738105e74301e  
2e3c3f3822124a3fa9fd905164f519ae - - -] Failed to snapshot image
  Traceback (most recent call last):
    File  
"/usr/lib/python2.7/site-packages/nova/virt/libvirt/driver.py", line  
1626, in snapshot
      purge_props=False)
    File "/usr/lib/python2.7/site-packages/nova/image/api.py", line  
132, in update
      purge_props=purge_props)
    File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line  
733, in update
      _reraise_translated_image_exception(image_id)
    File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line  
1050, in _reraise_translated_image_exception
      six.reraise(type(new_exc), new_exc, exc_trace)
    File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line  
731, in update
      image = self._update_v2(context, sent_service_image_meta, data)
    File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line  
745, in _update_v2
      image = self._add_location(context, image_id, location)
    File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line  
630, in _add_location
      location, {})
    File "/usr/lib/python2.7/site-packages/nova/image/glance.py", line  
168, in call
      result = getattr(controller, method)(*args, **kwargs)
    File "/usr/lib/python2.7/site-packages/glanceclient/v2/images.py",  
line 340, in add_location
      response = self._send_image_update_request(image_id, add_patch)
    File  
"/usr/lib/python2.7/site-packages/glanceclient/common/utils.py", line  
535, in inner
      return RequestIdProxy(wrapped(*args, **kwargs))
    File "/usr/lib/python2.7/site-packages/glanceclient/v2/images.py",  
line 324, in _send_image_update_request
      data=json.dumps(patch_body))
    File  
"/usr/lib/python2.7/site-packages/glanceclient/common/http.py", line  
294, in patch
      return self._request('PATCH', url, **kwargs)
    File  
"/usr/lib/python2.7/site-packages/glanceclient/common/http.py", line  
277, in _request
      resp, body_iter = self._handle_response(resp)
    File  
"/usr/lib/python2.7/site-packages/glanceclient/common/http.py", line  
107, in _handle_response
      raise exc.from_response(resp, resp.content)
  ImageNotAuthorized: Not authorized for image  
e99b2dfd-db33-4475-a51f-af4b913a7041.

  INFO nova.compute.manager [req-5bd2fef2-2155-4a89-b346-e20fb0b0d14a  
df7b63e69da3b1ee2be3d79342e7992f3620beddbdac7768dcb738105e74301e  
2e3c3f3822124a3fa9fd905164f519ae - - -] [instance:  
751b3731-de0d-42cd-a105-b92e326294aa] Successfully reverted task state  
from image_uploading on failure for instance.
---cut here---

A couple of weeks passed until this problem occured (oviously nobody  
took snapshots), so I didn't immediately connect it to the config  
change, but when I followed the stack trace, I found this comment:

---cut here---
     def _add_location(self, context, image_id, location):
         # 'show_multiple_locations' must be enabled in glance api conf file.
[...]
---cut here---

I wouldn't expect this dependency if the option is marked as  
deprecated. Is this my misunderstanding or did I forget other configs  
that would prevent this behavior?

Thank you for any information about this topic.

Regards,
Eugen

[1] http://docs.ceph.com/docs/master/rbd/rbd-openstack/#for-mitaka-only