Ceph

Braindump of what I did for the earlier libvirt migration demo:

- on each vm host, install kvm 0.15 (0.14 is too old) (I created patch kvm-014-debianization-forced-into-015-git-snapshot.diff)
- on each vm host, install libvirt, ensure you can run local vms
- patch libvirt with attached libvirt-kludge.diff (better fix being worked out with upstream currently; need to check image type instead of name)
- install patched libvirt on each vm host
- set up separate ceph cluster, disable cephx authentication (fix being worked out with libvirt & qemu upstreams)
- define a vm with virsh create, passing suitable xml for the storage, install from ISO or use "rbd import"

Once you have >=2 of those vm hosts going, you can just take a virt-manager connection to both, right click on a vm and choose migrate. There's nothing special to it.

Mike Lowe emailed me and mentioned it works for him on Oneiric with a custom kvm 0.15.1, no other changes. I still want QA coverage.