[libvirt-users] Determine ongoing shutdown via libvirt or preventing migrations to host

Hi list, Is there any function in libvirt to determine runlevel of host or any possibility to prevent VM migrations to that host ? I'm developing simple cluster of 4 servers running KVM VMs. For management I decided to use python-libvirt. It is working in that way, that every VM is diskless and booting via PXE so I can run it on every host server. Every VM has assigned one host as monitor which is responsible to periodically check, that VM is running on one of other hosts. If it don't run, it will be started on first available server assigned for that VM. When one of hosts is shut down, it will migrate all VMs to another hosts, but that monitor which checks VMs will migrate it after reboot. But I have race condition there that monitors can check that host is running before it is shutdown and will migrate VM's back to server which will reboot. Thank you for any help -- Ondřej Kunc, Senior Linux Administrator IGNUM s.r.o., Vinohradská 190, Praha 3, 130 61, CZE Mobil: +420 603 111 111 | Fax: +420 296 332 222 www.ignum.cz | www.domena.cz | www.webcloud.cz