** Also affects: nova (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1825882
Title:
Virsh disk attach errors silently ignored
Status in OpenStack Compute (nova):
Fix Released
Status in OpenStack Compute (nova) queens series:
Fix Committed
Status in OpenStack Compute (nova) rocky series:
Fix Committed
Status in OpenStack Compute (nova) stein series:
Fix Committed
Status in nova package in Ubuntu:
New
Bug description:
Description
===========
The following commit (1) is causing volume attachments which fail due to
libvirt device attach erros to be silently ignored and Nova report the
attachment as successful.
It seems that the original intention of the commit was to log a
condition and re-raise the exeption, but if the exception is of type
libvirt.libvirtError and does not contain the searched pattern, the
exception is ignored. If you unindent the raise statement, errors are
reported again.
In our case we had ceph/apparmor configuration problems in compute
nodes which prevented virsh attaching the device; volumes appeared as
successfully attached but the corresponding block device missing in
guests VMs. Other libvirt attach error conditions are ignored also, as
when you have already occuppied device names (i.e. 'Target vdb already
exists', device is busy, etc.)
(1)
https://github.com/openstack/nova/commit/78891c2305bff6e16706339a9c5eca99a84e409c
Steps to reproduce
==================
This is somewhat hacky, but is a quick way to provoke a virsh attach error:
- virsh detach-disk <domain> vdb
- update nova & cinder DB as if volume is detached
- re-attach volume
- volume is marked as attached, but VM block device is missing
Expected result
===============
- Error 'libvirtError: Requested operation is not valid: target vdb already
exists' should be raised, and volume not attached
Actual result
=============
- Attach successful but virsh block device not created
Environment
===========
- Openstack version Queens
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