On Fri, Apr 18, 2014 at 9:10 PM, Kyle Mestery <mest...@noironetworks.com>wrote:
> On Fri, Apr 18, 2014 at 8:52 AM, Oleg Bondarev <obonda...@mirantis.com> > wrote: > > Hi all, > > > > While investigating possible options for Nova-network to Neutron > migration > > I faced a couple of issues with libvirt. > > One of the key requirements for the migration is that instances should > stay > > running and don't need restarting. In order to meet this requirement we > need > > to either attach new nic to the instance or update existing one to plug > it > > to the Neutron network. > > > Thanks for looking into this Oleg! I just wanted to mention that if > we're trying to plug a new NIC into the VM, this will likely require > modifications in the guest. The new NIC will likely have a new PCI ID, > MAC, etc., and thus the guest would have to switch to this. Therefor, > I think it may be better to try and move the existing NIC from a nova > network onto a neutron network. > Yeah, I agree that modifying the existing NIC is the preferred way. > > So what I've discovered is that attaching a new network device is only > > applied > > on the instance after reboot although VIR_DOMAIN_AFFECT_LIVE flag is > passed > > to > > the libvirt call attachDeviceFlags(): > > > https://github.com/openstack/nova/blob/master/nova/virt/libvirt/driver.py#L1412 > > Is that expected? Are there any other options to apply new nic without > > reboot? > > > > I also tried to update existing nic of an instance by using libvirt > > updateDeviceFlags() call, > > but it fails with the following: > > 'this function is not supported by the connection driver: cannot modify > > network device configuration' > > libvirt API spec (http://libvirt.org/hvsupport.html) shows that 0.8.0 as > > minimal > > qemu version for the virDomainUpdateDeviceFlags call, kvm --version on my > > setup shows > > 'QEMU emulator version 1.0 (qemu-kvm-1.0)' > > Could someone please point what am I missing here? > > > What does "libvirtd -V" show for the libvirt version? On my Fedora 20 > setup, I see the following: > > [kmestery@fedora-mac neutron]$ libvirtd -V > libvirtd (libvirt) 1.1.3.4 > [kmestery@fedora-mac neutron]$ > On my Ubuntu 12.04 it shows: $ libvirtd --version libvirtd (libvirt) 0.9.8 > Thanks, > Kyle > > > Any help on the above is much appreciated! > > > > Thanks, > > Oleg > > > > > > _______________________________________________ > > OpenStack-dev mailing list > > OpenStack-dev@lists.openstack.org > > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev > > > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev >
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