[Openstack] qemu version for OpenStack Icehouse

Bernd Bausch berndbausch at gmail.com
Thu Feb 15 01:21:23 UTC 2018

The problem is not the qemu version, but the image file version. More recently, qcow3 seems to be used; Icehouse probably uses qcow2.

I think you have a number of options. 

The easiest approach might be converting the image to qcow2:


Or convert it to raw. Main inconvenience is the increased size.

Or create a volume from the image, and on the destination system, boot from the volume and snapshot the instance to create an image again. 

-----Original Message-----
From: Georgios Dimitrakakis [mailto:giorgis at acmac.uoc.gr] 
Sent: Thursday, February 15, 2018 7:28 AM
To: Openstack <openstack at lists.openstack.org>
Subject: [Openstack] qemu version for OpenStack Icehouse

 Dear all,

 I am trying to build a Windows image on a rather new Ubuntu system  which image would be imported and used on an old OpenStack Icehouse  installation.

 The system on which I am building it has the following characteristics:

 Distributor ID:	Ubuntu
 Description:	Ubuntu 16.04.3 LTS
 Release:	16.04
 Codename:	xenial
 Kernel:         4.4.0-112-generic

 and the installed QEMU packages are:

 ii  qemu-block-extra:amd64                     1:2.5+dfsg-5ubuntu10.20  
                    amd64        extra block backend modules for 
 qemu-system and qemu-utils
 ii  qemu-kvm                                   1:2.5+dfsg-5ubuntu10.20  
                    amd64        QEMU Full virtualization
 ii  qemu-system-common                         1:2.5+dfsg-5ubuntu10.20  
                    amd64        QEMU full system emulation binaries 
 (common files)
 ii  qemu-system-x86                            1:2.5+dfsg-5ubuntu10.20  
                    amd64        QEMU full system emulation binaries 
 ii  qemu-utils                                 1:2.5+dfsg-5ubuntu10.20  
                    amd64        QEMU utilities

 The error that I am getting whey I try to launch the VM is the

 'ProcessExecutionError: Unexpected error while running
 command.\nCommand: env LC_ALL=C LANG=C qemu-img info  /var/lib/nova/instances/_base/ae8e48565dd0b934afe98a17febc0660077d7e35.part\nExit
 code: 1\nStdout: \'\'\nStderr: "\'image\' uses a qcow2 feature which is  not supported by this qemu version: QCOW version 3\\nCould not open
 Operation not supported\\n"\n'

 Using the same image on a newer OpenStack Ocata installation works fine  and the VM boots up and works without a problem.

 Obviously there is a version mismatch and something on this image is  not supported by OpenStack Icehouse.

 Do you know where the problem could be? Is there a way to build it with  backwards compatibility or can someone point out to me the latest  versions that would work with OpenStack Icehouse?

 Unfortunately for the moment it's not possible to upgrade OpenStack. We  will in the next few months but for the moment is important to have it  working.

 Looking forward for your answers!

 Best regards,


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