3:26 a.m.
On Mon, Jun 04, 2018 at 09:41:07PM +0300, Roman Kagan wrote:
Not so long ago openstack-nova started to require qemu-kvm-rhev
instead
of qemu-kvm.
This made it impossible to install on Virtuozzo, which used to work well
before the change.
I think Virtuozzo is based on CentOS.
I skimmed through the related tickets
https://bugzilla.redhat.com/show_bug.cgi?id=1367696
https://review.rdoproject.org/r/1900
https://bugzilla.redhat.com/show_bug.cgi?id=1392820
https://review.rdoproject.org/r/9858
but failed to understand the motivation behind this change. What are
those particular features that are only present in qemu-kvm-rhev and
make the vendor-neutral requirement insufficient? So far we didn't
notice any issues running recent enough QEMU with Nova, but I guess this
must have changed.
Dan has already responded. In short, 'qemu-kvm-rhev' is the recommended
RPM for Red Hat OSP.
- - -
FYI, a related change that will get shortly pushed to RDO Nova spec (and
to "Queens" branch too):
https://review.rdoproject.org/r/#/c/13277/ -- Bump the minimum
version of 'qemu-kvm-rhev' & libvirt
I'm now trying to figure out what is needed to make our QEMU
package
work with Nova; any help will be appreciated.
Thanks,
Roman.
--
/kashyap
3:46 a.m.
New subject: qemu-kvm vs qemu-kvm-rhev requirement
On 06/05/2018 10:26 AM, Kashyap Chamarthy wrote:
On Mon, Jun 04, 2018 at 09:41:07PM +0300, Roman Kagan wrote:
> Not so long ago openstack-nova started to require qemu-kvm-rhev instead
> of qemu-kvm.
>
> This made it impossible to install on Virtuozzo, which used to work well
> before the change.
I think Virtuozzo is based on CentOS.
> I skimmed through the related tickets
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1367696
> https://review.rdoproject.org/r/1900
> https://bugzilla.redhat.com/show_bug.cgi?id=1392820
> https://review.rdoproject.org/r/9858
>
> but failed to understand the motivation behind this change. What are
> those particular features that are only present in qemu-kvm-rhev and
> make the vendor-neutral requirement insufficient? So far we didn't
> notice any issues running recent enough QEMU with Nova, but I guess this
> must have changed.
Dan has already responded. In short, 'qemu-kvm-rhev' is the recommended
RPM for Red Hat OSP.
- - -
FYI, a related change that will get shortly pushed to RDO Nova spec (and
to "Queens" branch too):
https://review.rdoproject.org/r/#/c/13277/ -- Bump the minimum
version of 'qemu-kvm-rhev' & libvirt
> I'm now trying to figure out what is needed to make our QEMU package
> work with Nova; any help will be appreciated.
>
> Thanks,
> Roman.
Maybe the missing information is that qemu-kvm-ev is provided by the
CentOS Virt SIG => https://cbs.centos.org/koji/packageinfo?packageID=539
If you use the release packages provided by RDO or CentOS extras,
repositories are correctly setup to retrieve it.
Regards,
H.
4:26 a.m.
New subject: qemu-kvm vs qemu-kvm-rhev requirement
> On Mon, Jun 04, 2018 at 09:41:07PM +0300, Roman Kagan wrote:
>> I'm now trying to figure out what is needed to make our QEMU package
>> work with Nova; any help will be appreciated.
Where is Virtuozzo qemu RPM coming from?
If it is a separate package, could it provide virtuozzo specific Provide: e.g.
Provides: qemu-virtuozzo
then we could sub-package openstack-nova to have separate optional
package for each hypervisor.
Cheers,
Alan
5:17 a.m.
New subject: qemu-kvm vs qemu-kvm-rhev requirement
On Tue, Jun 05, 2018 at 11:26:56AM +0200, Alan Pevec wrote:
>> On Mon, Jun 04, 2018 at 09:41:07PM +0300, Roman Kagan
wrote:
>>> I'm now trying to figure out what is needed to make our QEMU package
>>> work with Nova; any help will be appreciated.
Where is Virtuozzo qemu RPM coming from?
If it is a separate package, could it provide virtuozzo specific Provide: e.g.
Provides: qemu-virtuozzo
It's actually named qemu-kvm-vz (and all the subpackages have this -vz
suffix in its name, too). Also we provide and obsolete corresponding
packages without a suffix, similar to how qemu-kvm-rhev does.
then we could sub-package openstack-nova to have separate optional
package for each hypervisor.
I'm not sure I understand what you mean. Can you please give an
example?
Thanks,
Roman.
7:56 a.m.
New subject: qemu-kvm vs qemu-kvm-rhev requirement
> then we could sub-package openstack-nova to have separate
optional
> package for each hypervisor.
I'm not sure I understand what you mean. Can you please give an
example?
To allow hypervisor-specific deps, we could split %package compute into
%package compute-common
as-is now, just w/o hypervisor specific Requires:
and subpackage per hypervisor e.g.
%package compute-kvm
Requires: openstack-nova-compute-common = %{epoch}:%{version}-%{release}
# backward compat
Provides: openstack-nova-compute
Obsoletes: openstack-nova-compute
Requires: qemu-kvm-rhev
%package compute-xen
Requires: openstack-nova-compute-common = %{epoch}:%{version}-%{release}
Requires: xen
%package compute-vz
Requires: openstack-nova-compute-common = %{epoch}:%{version}-%{release}
Requires: qemu-kvm-vz
TBH this might be an over-kill since we do not run anything but
qemu-kvm-ev in CI, so workaround in your qemu package providing
qemu-kvm-rhev is fine.
Cheers,
Alan
4:28 a.m.
New subject: qemu-kvm vs qemu-kvm-rhev requirement
On Tue, Jun 05, 2018 at 10:26:54AM +0200, Kashyap Chamarthy wrote:
On Mon, Jun 04, 2018 at 09:41:07PM +0300, Roman Kagan wrote:
> Not so long ago openstack-nova started to require qemu-kvm-rhev instead
> of qemu-kvm.
>
> This made it impossible to install on Virtuozzo, which used to work well
> before the change.
I think Virtuozzo is based on CentOS.
Right, to a large extent. However, our QEMU package is much closer to
qemu-kvm-rhev than to CentOS' qemu-kvm. It's still different from
qemu-kvm-rhev in some respects so we don't feel comfortable providing
"qemu-kvm-rhev" in our package.
> I skimmed through the related tickets
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1367696
> https://review.rdoproject.org/r/1900
> https://bugzilla.redhat.com/show_bug.cgi?id=1392820
> https://review.rdoproject.org/r/9858
>
> but failed to understand the motivation behind this change. What are
> those particular features that are only present in qemu-kvm-rhev and
> make the vendor-neutral requirement insufficient? So far we didn't
> notice any issues running recent enough QEMU with Nova, but I guess this
> must have changed.
Dan has already responded. In short, 'qemu-kvm-rhev' is the recommended
RPM for Red Hat OSP.
This is clear :) I'm interested in a longer reply to "why", in order to
figure out how to correctly run Nova on top of Virtuozzo.
Thanks,
Roman.
8:45 a.m.
New subject: qemu-kvm vs qemu-kvm-rhev requirement
On 06/05/2018 11:28 AM, Roman Kagan wrote:
On Tue, Jun 05, 2018 at 10:26:54AM +0200, Kashyap Chamarthy wrote:
> On Mon, Jun 04, 2018 at 09:41:07PM +0300, Roman Kagan wrote:
>> Not so long ago openstack-nova started to require qemu-kvm-rhev instead
>> of qemu-kvm.
>>
>> This made it impossible to install on Virtuozzo, which used to work well
>> before the change.
>
> I think Virtuozzo is based on CentOS.
Right, to a large extent. However, our QEMU package is much closer to
qemu-kvm-rhev than to CentOS' qemu-kvm. It's still different from
qemu-kvm-rhev in some respects so we don't feel comfortable providing
"qemu-kvm-rhev" in our package.
The thing is EL7 is stuck at RPM 4.11.x. If we had RPM 4.13.x, we could
have used boolean dependencies to do that:
Requires: qemu-kvm-rhev >= 2.9.0 or qemu-kvm-virtuozzo >= x.y.z
Meanwhile, we don't have much alternatives than the one already
suggested to provide qemu-kvm-rhev
>> I skimmed through the related tickets
>>
>> https://bugzilla.redhat.com/show_bug.cgi?id=1367696
>> https://review.rdoproject.org/r/1900
>> https://bugzilla.redhat.com/show_bug.cgi?id=1392820
>> https://review.rdoproject.org/r/9858
>>
>> but failed to understand the motivation behind this change. What are
>> those particular features that are only present in qemu-kvm-rhev and
>> make the vendor-neutral requirement insufficient? So far we didn't
>> notice any issues running recent enough QEMU with Nova, but I guess this
>> must have changed.
>
> Dan has already responded. In short, 'qemu-kvm-rhev' is the recommended
> RPM for Red Hat OSP.
This is clear :) I'm interested in a longer reply to "why", in order to
figure out how to correctly run Nova on top of Virtuozzo.
Thanks,
Roman.
In short, it's a trimmed version of qemu-kvm for enterprise users:
* unsupported devices/features are disabled
* features backported from the next branch (including support for newer CPU)
Most patches are linked to an upstream pull request, or a ticket for bugs.
In our case, I think we're mostly interested in live migration features
backports, but that might not be accurate or up-to-date as I'm not
focusing on compute.
Regards,
H.
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6 comments
4 participants
participants (4)
-
Alan Pevec -
Haïkel Guémar -
Kashyap Chamarthy -
Roman Kagan