On Thu, May 15, 2014 at 05:03:13PM +0100, Adam Fyfe wrote: You seem to be using a libvirt hook script[1] which is not part of default OpenStack installations. Did you ensure that your that script is invoked correctly? (As that is executed everytime QEMU starts/stops a Nova guest. To diagnose this further, a few questions: - What host OS? - What OpenStack version (openstack-nova specifically) - Versions of libvirt, qemu on your host - Your (sanitized) nova.conf from Compute node - What hypervisor combination? I assume libvirt+QEMU+KVM. - Any other configuration alterations you did that'll occur during boot time of a guest Additionally, you can enable libvirt debug logs by setting these in your /etc/libvirt/libvirtd.conf: log_level = 1 log_outputs = 1:file:/var/tmp/libvirtd.log Restart libvirtd, openstack-nova-compute, and start your guest (Don't forget to turn off the verbose logging once your debugging is done.) [1] http://libvirt.org/hooks.html -- /kashyap