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> On 14 May 2016, at 5:36 AM, Flavio Percoco <flavio at redhat.com> wrote:
> 
>> On 5/12/16 9:20 PM, Sam Morrison wrote:
>> 
>>   We find glance registry quite useful. Have a central glance-registry api is useful when you have multiple datacenters all with glance-apis and talking back to a central registry service. I guess they could all talk back to the central DB server but currently that would be over the public Internet for us. Not really an issue, we can work around it.
>> 
>>   The major thing that the registry has given us has been rolling upgrades. We have been able to upgrade our registry first then one by one upgrade our API servers (we have about 15 glance-apis)
> 
> I'm curious to know how you did this upgrade, though. Did you shutdown your
> registry nodes, upgraded the database and then re-started them? Did you upgraded
> one registry node at a time?
> 
> I'm asking because, as far as I can tell, the strategy you used for upgrading
> the registry nodes is the one you would use to upgrade the glance-api nodes
> today. Shutting down all registry nodes would live you with unusable glance-api
> nodes anyway so I'd assume you did a partial upgrade or something similar to
> that.

Yeah, if glance supported versioned objects then yes this would be great. 

We only have 3 glance-registries and so upgrading these first is a lot easier than upgrading all ~15 of our glance-apis at once.

Sam