On 3/15/2018 5:29 PM, Dan Smith wrote:
Yep, for sure. I think if there are snapshots, we have to refuse to do
te thing. My comment was about the "does nova have authority to destroy
the root volume during a rebuild" and I think it does, if
delete_on_termination=True, and if there are no snapshots.
Agree with this.
Things do get a bit weird with delete_on_termination and if nova 'owns'
the volume. delete_on_termination is False by default, even if you're
doing boot from volume with source_type of 'image' or 'snapshot' where
nova creates the volume for you.
If a user really cared about preserving the volume, they'd probably
pre-create it (with their favorite volume type since you can't tell nova
the volume type to use) and pass it to nova with
delete_on_termination=False explicitly.
Given the defaults, I'm not sure how many people are going to specify
delete_on_termination=True, thinking about the implications, which then
means they can't rebuild their volume-backed instance later because nova
can't / won't delete the volume.
If we can solve this without deleting the volume at all and just
re-image it, then it's a non-issue.
--
Thanks,
Matt
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