[systemd-devel] Enabling timesyncd in virtual machines

[Zbigniew Jędrzejewski-Szmek]

On Sun, Mar 15, 2015 at 07:47:46PM +0100, Kay Sievers wrote:
> On Fri, Mar 13, 2015 at 8:25 PM, Michael Marineau
> <michael.marineau at coreos.com> wrote:
> > Greetings,
> >
> > Currently systemd-timesyncd.service includes
> > ConditionVirtualization=no, disabling it in both containers and
> > virtual machines. Each VM platform tends to deal with or ignore the
> > time problem in their own special ways, KVM/QEMU has the kernel time
> > source kvm-clock, Xen has had different schemes over the years, VMware
> > expects a userspace daemon sync the clock, and other platforms are
> > content to drift with the wind as far as I can tell.
> >
> > I don't know of a robust way to know if a platform needs a little
> > extra help from userspace to keep the clock sane or not but it seems
> > generally safer to try than to risk drifting. Does anyone know of a
> > reason to leave timesyncd off by default? Otherwise switching to
> > ConditionVirtualization=!container should be reasonable.
> 
> Sounds reasonable. Until someone has a better or clear idea how to
> solve that reliably, I turned the option around.
What about adding

ConditionVirtualization=!kvm ?

Zbyszek