On 10/27/2015 05:27 PM, Tang Chen wrote:
On 10/27/2015 08:02 AM, Jay Pipes wrote:
Evacuate does *not* migrate/move anything. Evacuate *rebuilds* VMs
from their original source image.
Well, I just dug into the source code. I think there could be some
difference between evacuate in nova server side and client side. In nova
compute, the evacuate API does call rebuild process as you said. But in
novaclient, there is a command "nova host-evacuate-live", which will
live-migrate all running VMs, which made me believe that evacuate also
migrates VMs. Please refer to:
https://github.com/openstack/python-novaclient/blob/master/novaclient/v2/contrib/host_evacuate_live.py#L72
I think this is also a reason why I always got confused in all these
concepts: cold-migrate, evacuate, evacuate-live, rebuild, resize.
Yes, this is a most unfortunate issue :( host-evacuate in the
python-novaclient is not related at all to the evacuate server API.
We need to clean up this mess.
Best,
-jay
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