Re: [libvirt-users] VM dies with error regarding "virConnectNumOfInterfaces"

On 07/20/2012 05:12 PM, Helga Velroyen wrote: This message is guaranteed unrelated to your guest dying. It means that some management program (for example virt-manager) is trying out the "virInterface" part of libvirt's API, and discovering that your platform does not support that part of the API. the virInterface functions deal with configuring and reporting the status of the host's network devices (physical ethernets, bridges, bonds), are only supported on platforms that have the "netcf" library, and are optional. Ubuntu is only just now getting netcf support into their distro, do Xubuntu 11.10 will certainly not have it. TL;DR ignore the error about virConnectNumOfInterfaces. This just means that the qemu process terminated abruptly. If you look in /var/log/libvirt/qemu/${guestname}.log, you may find a more specific error message issued by qemu itself. In the meantime, it would be helpful when reporting problems to tell us the version of libvirt and qemu that are installed. The XML looks fine to me (the "managed='no'" part would only be relevant for PCI devices, not USB, but it would be ignored in this case, so that's not a problem). To help figure out what may be the problem, do this: 1) try starting the guest from the shell with "virsh start ${guestname}", and send any error message that produces. Also let us know the versions of libvirt ("virsh -v" will give you that) and qemu (or kvm - different platforms have different names for the packages) - various older versions of libvirt have various bugs, and knowing the version helps us to narrow down possibilities. 2) After virsh start fails, look at the end of /var/log/libvirt/qemu/${guestname}.log - send everything starting from the last qemu (or maybe it's kvm in your distro) commandline to the end of the file. 3) Just to verify that the problem really is in the USB device definition, use virsh edit to remove it, then retry the start.