Open Stack

----- Original Message -----
> From: "David Moreau Simard" <dms at redhat.com>
> To: "OpenStack Development Mailing List (not for usage questions)" <openstack-dev at lists.openstack.org>, "OpenStack
> Operators" <openstack-operators at lists.openstack.org>
> Sent: Tuesday, December 13, 2016 6:13:12 PM
> Subject: [Openstack-operators] [all] Known issue with CentOS 7.3 and	qemu-kvm(-ev) 2.6.0
> 
> Hi,
> 
> CentOS 7.3 was released yesterday and a newer version of qemu-kvm-ev
> was shipped as part of this release if you have the CentOS
> Virtualization SIG repositories enabled.

Isn't the issue that the newer version of qemu-kvm-ev (2.6.0) *hasn't* shipped yet? E.g. it's not in:

    http://mirror.centos.org/centos/7/virt/x86_64/kvm-common/

Hence the mismatch is created because the CentOS repos contain Libvirt 2.0.0 but not a matching qemu-kvm-ev build (yet).

Thanks,

Steve

> If you're using RDO >= Newton, you will have this repository enabled.
> It was not yet enforced in the Mitaka release so you might or might
> not have it, depending on your deployment.
> Older releases of OpenStack may also be affected but they are not
> proactively tested anymore due to EOL.
> 
> There is currently a known issue when using the following
> configuration in nova for compute:
> ==
> virt_type=qemu
> cpu_mode=host-model
> ==
> 
> This combination will yield in failed attempts at creating instances
> and you will see errors like these in nova-compute.log [1] or the
> libvirt logs [2].
> The problem boils down to libvirt trying to pass a cpu extension that
> is unknown to qemu:
> ==
> qemu-kvm: CPU feature arat not found
> ==
> 
> There is a bugzilla [3] for this issue but in the meantime users are
> encouraged to work around the issue by setting "cpu_mode=none" if they
> are using the qemu (not KVM) hypervisor.
> Please note that Nova defaults the 'cpu_mode' parameter to
> 'host-model' [4] if 'cpu_mode' is not explicitely configured and
> 'virt_type' is 'qemu' so if you're running into this issue, you will
> need to explicitely configure it.
> 
> [1]:
> http://logs.openstack.org/76/409476/4/check/gate-puppet-openstack-integration-4-scenario003-tempest-centos-7/8881991/logs/nova/nova-compute.txt.gz#_2016-12-13_16_39_50_832
> [2]:
> http://logs.openstack.org/76/409476/4/check/gate-puppet-openstack-integration-4-scenario003-tempest-centos-7/8881991/logs/libvirt/qemu/instance-00000001.txt.gz
> [3]: https://bugzilla.redhat.com/show_bug.cgi?id=1371617
> [4]:
> http://git.openstack.org/cgit/openstack/nova/tree/nova/virt/libvirt/driver.py?id=146b27f22327f8d60c1017c22ccf18d0e16f1eb7#n3411
> 
> David Moreau Simard
> Senior Software Engineer | Openstack RDO
> 
> dmsimard = [irc, github, twitter]
> 
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