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On 09/27/2018 06:23 PM, Matt Riedemann wrote:
> On 9/27/2018 3:02 PM, Jay Pipes wrote:
>> A great example of this would be the proposed "deploy template" from 
>> [2]. This is nothing more than abusing the placement traits API in 
>> order to allow passthrough of instance configuration data from the 
>> nova flavor extra spec directly into the nodes.instance_info field in 
>> the Ironic database. It's a hack that is abusing the entire concept of 
>> the placement traits concept, IMHO.
>>
>> We should have a way *in Nova* of allowing instance configuration 
>> key/value information to be passed through to the virt driver's 
>> spawn() method, much the same way we provide for user_data that gets 
>> exposed after boot to the guest instance via configdrive or the 
>> metadata service API. What this deploy template thing is is just a 
>> hack to get around the fact that nova doesn't have a basic way of 
>> passing through some collated instance configuration key/value 
>> information, which is a darn shame and I'm really kind of annoyed with 
>> myself for not noticing this sooner. :(
> 
> We talked about this in Dublin through right? We said a good thing to do 
> would be to have some kind of template/profile/config/whatever stored 
> off in glare where schema could be registered on that thing, and then 
> you pass a handle (ID reference) to that to nova when creating the 
> (baremetal) server, nova pulls it down from glare and hands it off to 
> the virt driver. It's just that no one is doing that work.

No, nobody is doing that work.

I will if need be if it means not hacking the placement API to serve 
this purpose (for which it wasn't intended).

-jay