CentOS virt - Aug 2016 - Lost a NIC on start

Hello,

CentOS 7.2

I have a big Problem with libvirt or KVM, my Virtual Hosts lost sometime a NIC 
on start.

I have configured 4 NIC on the Virtual host two passthru and 2 virtual, on 
start most time i lost a virtual NIC :-(

So after a reboot I have to check always is all running and working.?

with a "virsh reboot xxxx" in the most time it come back ?

Have any a Idea why ?

I found nothing in the Logs :-(.

-- 
mit freundlichen Gr??en / best regards,

  G?nther J. Niederwimmer

On Tue, Aug 2, 2016 at 4:12 AM, G?nther J. <gjn at gjn.priv.at>
wrote:
> Hello,
>
> CentOS 7.2
>
> I have a big Problem with libvirt or KVM, my Virtual Hosts lost sometime a
NIC
> on start.
What does "lose a NIC" mean? Does it mean that device doesn't show
up
at all, and is not apparent with "/sbin/ifconfig -a" ? Or does it mean
that the device is not properly configured with IP address and
connected to the local network?

I've certainly noticed with various virtualization systems and CentOS
6 that sometimes DHCP doesn't get configured in the very short time
between the VM booting and the prompt being available. It always
recovers with a "/sbin/service network restart".
> I have configured 4 NIC on the Virtual host two passthru and 2 virtual, on
> start most time i lost a virtual NIC :-(
>
> So after a reboot I have to check always is all running and working.?
>
> with a "virsh reboot xxxx" in the most time it come back ?
>
> Have any a Idea why ?
>
> I found nothing in the Logs :-(.
>
> --
> mit freundlichen Gr??en / best regards,
>
>   G?nther J. Niederwimmer
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> https://lists.centos.org/mailman/listinfo/centos-virt

Hello,

Am Mittwoch, 3. August 2016, 09:07:55 schrieb Nico
Kadel-Garcia:
> On Tue, Aug 2, 2016 at 4:12 AM, G?nther J. <gjn at gjn.priv.at>
wrote:
> > 
> > CentOS 7.2
> > 
> > I have a big Problem with libvirt or KVM, my Virtual Hosts lost
sometime a
> > NIC on start.
> 
> What does "lose a NIC" mean? Does it mean that device doesn't
show up
> at all, and is not apparent with "/sbin/ifconfig -a" ? Or does it
mean
> that the device is not properly configured with IP address and
> connected to the local network?
It doesn't show up

NM is disabled
 
> I've certainly noticed with various virtualization systems and CentOS
> 6 that sometimes DHCP doesn't get configured in the very short time
> between the VM booting and the prompt being available. It always
> recovers with a "/sbin/service network restart".
DHCP is not configured all have a fix IP

in this situation service restart is not possible it answers with a Error only 
a reboot helps ?
 
> > I have configured 4 NIC on the Virtual host two passthru and 2
virtual, on
> > start most time i lost a virtual NIC :-(
> > 
> > So after a reboot I have to check always is all running and working.?
> > 
> > with a "virsh reboot xxxx" in the most time it come back ?
> > 
> > Have any a Idea why ?
> > 
> > I found nothing in the Logs :-(.
> > 
> > --
> > mit freundlichen Gr??en / best regards,
> > 
> >   G?nther J. Niederwimmer
> > 
> > _______________________________________________
> > CentOS-virt mailing list
> > CentOS-virt at centos.org
> > https://lists.centos.org/mailman/listinfo/centos-virt
> 
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> https://lists.centos.org/mailman/listinfo/centos-virt
-- 
mit freundlichen Gr??en / best regards,

  G?nther J. Niederwimmer