Open Stack

Part of the issue here is that the CentOS team told us yesterday they were
having technical difficulties signing and releasing the new 2.6.0 packages
to the public mirrors.

Yesterday around 6:30PM UTC they gave us an approximate ETA of 5 hours. I
see this morning that it still seems problematic and I pinged them in order
to let them know.

We've definitely also seen glimpses of issues related to running qemu-kvm
<2.6.0 paired with CentOS 7.3 so thanks for the clarifications.

David Moreau Simard
Senior Software Engineer | Openstack RDO

dmsimard = [irc, github, twitter]

On Dec 13, 2016 11:06 PM, "Steve Gordon" <sgordon at redhat.com> wrote:

> ----- 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]
> >
> > _______________________________________________
> > OpenStack-operators mailing list
> > OpenStack-operators at lists.openstack.org
> > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
> >
>
>
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