Public bug reported: Afaics Nova breaks with Qemu versions newer than the minimum required version.
The change at [1] added support for setting MTU size in the libvirt settings of guests. This code checks for a minimum libvirt version 3.3.0 [2] but not for a required Qemu version. The Nova minimum required Qemu version is 2.5 currently according to [3] (which is the latest release available with Ubuntu Xenial 16.04). Afaics Qemu added support with release 2.9 [4] which means versions 2.5 to 2.8 of Qemu will break despite being listed as supported iiuc. This issue broke our CIs. For verification i checked the master commit [5] which merged prior to [1] which tested ok with our CI. The fix probably is to simply add a check for the minimum required Qemu version beside the minimum required libvirt version. [1] https://review.openstack.org/#/c/553072/ [2] https://github.com/openstack/nova/blob/4ea64cad3fcc4897690bfb2c02d2b06d65db4dcf/nova/virt/libvirt/vif.py#L55 [3] https://wiki.openstack.org/wiki/LibvirtDistroSupportMatrix [4] https://wiki.qemu.org/ChangeLog/2.9) [5] https://review.openstack.org/#/c/570656/ ** Affects: nova Importance: Undecided Status: New -- You received this bug notification because you are a member of Yahoo! Engineering Team, which is subscribed to OpenStack Compute (nova). https://bugs.launchpad.net/bugs/1779626 Title: MTU setting feature conflicts with minimum Qemu version Status in OpenStack Compute (nova): New Bug description: Afaics Nova breaks with Qemu versions newer than the minimum required version. The change at [1] added support for setting MTU size in the libvirt settings of guests. This code checks for a minimum libvirt version 3.3.0 [2] but not for a required Qemu version. The Nova minimum required Qemu version is 2.5 currently according to [3] (which is the latest release available with Ubuntu Xenial 16.04). Afaics Qemu added support with release 2.9 [4] which means versions 2.5 to 2.8 of Qemu will break despite being listed as supported iiuc. This issue broke our CIs. For verification i checked the master commit [5] which merged prior to [1] which tested ok with our CI. The fix probably is to simply add a check for the minimum required Qemu version beside the minimum required libvirt version. [1] https://review.openstack.org/#/c/553072/ [2] https://github.com/openstack/nova/blob/4ea64cad3fcc4897690bfb2c02d2b06d65db4dcf/nova/virt/libvirt/vif.py#L55 [3] https://wiki.openstack.org/wiki/LibvirtDistroSupportMatrix [4] https://wiki.qemu.org/ChangeLog/2.9) [5] https://review.openstack.org/#/c/570656/ To manage notifications about this bug go to: https://bugs.launchpad.net/nova/+bug/1779626/+subscriptions -- Mailing list: https://launchpad.net/~yahoo-eng-team Post to : yahoo-eng-team@lists.launchpad.net Unsubscribe : https://launchpad.net/~yahoo-eng-team More help : https://help.launchpad.net/ListHelp
