[libvirt-users] update qemu-kvm with running guests?

[Eric Blake]

On 03/12/2013 01:29 PM, Jamie Fargen wrote:
> Good Afternoon,
> 
> I was curious to know what happens to running guests when the qemu-kvm rpm
> is update via yum. I assume that the current qemu processes would be
> running the old binary, but the new processes would be started using the
> new binary. Please let me know if this assumption is correct.

This is indeed correct.

The only potential gotcha is if the newer qemu is newer than what
libvirt is expecting (for example, about a year ago, if you ran Fedora
16 and installed qemu 1.0 from fedora-virt-preview but left libvirt from
the stock Fedora install, then libvirt would fail to run qemu); but as
long as you upgrade libvirt first or at the same time as qemu, and
restart libvirtd before starting new guests (a libvirtd restart has no
impact to running guests), you should never hit this situation.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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