On 01/25/2012 04:34 PM, Ken Coar wrote: > Is there any way to interface with virsh to keep it from executing a > startup operation? Sort of like the /etc/nologin (man page nologin(5)) > mechanism? > > Basically, I want to be able to shut down a VM in order to copy its > disk images, and be reasonably assured that it won't be started > before I'm finished. > > Is there any sort of hook or interlock file or other mechanism to > accomplish this? Libvirt has startup hooks; if the hook fails, the domain won't be started. So you could write a hook that checks if the domain about to be started is on your black-list because you are in the middle of some other operation on the disk image. You do have to restart libvirtd to recognize a newly added hook, though. http://libvirt.org/hooks.html Libvirt also has the ability to interact with the sanlock file lock manager; if you configure libvirt to use the lock manager, and then you can independently take out a lease on a disk image, then you can lock out libvirt from starting any domain with that image. http://libvirt.org/locking.html -- Eric Blake eblake@xxxxxxxxxx +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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