[Openstack] qemu version for OpenStack Icehouse

Georgios Dimitrakakis giorgis at acmac.uoc.gr
Wed Feb 14 22:28:20 UTC 2018

 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 

 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 
 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 

 Looking forward for your answers!

 Best regards,


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