A simple solution that wouldn’t require modification of glance would be a cron 
job
that lists images and snapshots and marks them protected while they are in use.

Vish

On Dec 16, 2014, at 3:19 PM, Collins, Sean <sean_colli...@cable.comcast.com> 
wrote:

> On Tue, Dec 16, 2014 at 05:12:31PM EST, Chris St. Pierre wrote:
>> No, I'm looking to prevent images that are in use from being deleted. "In
>> use" and "protected" are disjoint sets.
> 
> I have seen multiple cases of images (and snapshots) being deleted while
> still in use in Nova, which leads to some very, shall we say,
> interesting bugs and support problems.
> 
> I do think that we should try and determine a way forward on this, they
> are indeed disjoint sets. Setting an image as protected is a proactive
> measure, we should try and figure out a way to keep tenants from
> shooting themselves in the foot if possible.
> 
> -- 
> Sean M. Collins
> _______________________________________________
> OpenStack-dev mailing list
> OpenStack-dev@lists.openstack.org
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