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.
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? Any help on the above is much appreciated! Thanks, Oleg
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