5:11 a.m.
On Tue, Jun 05, 2018 at 10:24:03AM +0100, Daniel P. Berrangé wrote:
On Tue, Jun 05, 2018 at 12:18:59PM +0300, Roman Kagan wrote:
[...]
> This is exactly my problem: you're mixing up two separate
things, the
> QEMU version (vendor-neutral) and the features that can only be found in
> the vendor-specific package, and I'm struggling to understand which one
> is the deal-breaker.
>
> E.g. if I try to install Nova from
> http://mirror.centos.org/centos/7/cloud/x86_64/openstack-ocata/ on my
> Fedora28 machine, I have no way to satisfy this qemu-kvm-rhev
> dependency, even though qemu-kvm installed is at version 2.11.1.
>
> Is this the intended behavior?
In this case we don't care, because mixing distros is explicitly
unsupported. ie you can't expect RPMs build for CentOS7 to be able
to successfully dep-solve against RPMs biuld for Fedora 28. If it
ever worked, it is purely by luck not design.
IIUC, RDO project explicitly dropped support for running on Fedora
and only targets CentOS or RHEL.
Yes, that is my understanding as well. It was largely dropped to
little-to-no testing on Fedora. And most testing done on CentOS and
RHEL.
> If it is, and Nova can only be used with this very special QEMU
built
> for RHEV, what are the specific features I should be looking out for to
> be able to produce a compatible build? E.g. we (Virtuozzo) ship QEMU
> package based on approximately the same mainline QEMU version as RHEV
> but with different downstream patches and configuration. Is it likely
> not to work with Nova?
The qemu-kvm-rhev build is not really special - in fact it is probably
more "normal" than the 'qemu-kvm' build because it is a modern QEMU
version and so has relatively few patches backported, compared to the
ancient 1.5.3 which has a load of patches backported.
So if you have a QEMU build of comparable vintage to qemu-kvm-rhev
that would likely work. You can then solve the deps problem by adding
a virtual "Provides: qemu-kvm-ev = X.Y.Z"
Yep, because the CentOS package is called: 'qemu-kvm-ev'. Also you
(Roman) might want to refer to the following note in the RDO Git/master
'openstack-nova.spec' (the RPM spec):
# NOTE-1: CentOS package is called 'qemu-kvm-ev', but it has a
# compatiblity "Provides: qemu-kvm-rhev", so it'll do the
# right thing, that's why we're not special-casing CentOS
# here.
So, even if you're using CentOS, and are trying to install
'qemu-kvm-rhev', it should do the Right Thing.
--
/kashyap
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Kashyap Chamarthy