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[Joseph Heck <heckj@xxxxxx>]

While I've been roaming about the summit and conference, I've been trying to figure out exactly what we're modeling with the current "service" and "endpoints" that are in the API today. After talking with a number of folks, it's getting clearer that how it's being used is very installation specific.

I'd like to simplify this aspect of the API if at all possible, especially with a lot of the good ideas around describing the relationships between endpoints and and their installation.

The use cases I'm hearing actively in use are:

* (Horizon/UI/client) To indicate to a user where they can go to access their data
* (Glance, Nova, Keystone client) to find the endpoint relevant to uploading images (current client implementations appear to assume there is only one image endpoint)

The use case to indicate a geographic location for a datacenter or "cloud" is not consistent - some implementations I've learned of have that feature (and use "Region" for that sort of information), and others are load balancing a single endpoint to deploy to multiple datacenters and geographic regions from a single endpoint.

At the summit and conference, I heard a desire to expose geographic information with the endpoints, but that is clearly an operator specific implementation/deployment detail. Likewise I heard a lot of "We could really..." if additional metadata was easily available on endpoints, again in fairly implementation/deployment specific detail.

So looking forward towards a v.next API, what do you all think about having just "endpoints", with everything else being attributes on those endpoints (including what "service" and "type" it is), with some expected conventions (that there are a few well defined types - such as PublicURL and InternalURL, and relevant names for the rest API endpoints (ec2, compute, volume, image, identity...) 

Additional metadata can then float on the endpoints in deployment/implementation specific ways that don't lock in other systems to be deployed and implemented in the same fashion.

-joe


On Apr 20, 2012, at 1:47 PM, Lorin Hochstein wrote:
> On Apr 13, 2012, at 12:34 PM, Adam Gandelman wrote:
>> On 04/13/2012 10:50 AM, Dolph Mathews wrote:
>>> 
>>> While $(tenant_id)s is certainly the documented syntax, it appears that the SQL catalog backend (and *only* the SQL catalog backend, as far as I can tell) explicitly supports both $(tenant_id)s and %(tenant_id)s:
>>> 
>>> https://github.com/openstack/keystone/blob/master/keystone/catalog/backends/sql.py#L163
>>> 
>>> Perhaps Adam Gandelman has some insight?
>>> 
>>> -Dolph
>> 
>> Dolph-
>> 
>> No, the same is supported in the case of templated catalog as well, which is what the SQL catalog was largely based off:
>> 
>> https://github.com/openstack/keystone/blob/master/keystone/catalog/backends/templated.py#L115
>> 
>> Just tested that "sed -i 's/\$/%/g' /etc/keystone/default_catalog.templates" still produces a functional service catalog when configured to use the templated backend.
>> 
>> Seeing as both are supported, perhaps it would be better for docs to be updated to refer to the use of % instead of $ to avoid people running into problems with the $() sub-shell?
>> 
> 
> The OpenStack Install and Deploy manual has some language about this (see last paragraph): http://docs.openstack.org/trunk/openstack-compute/install/content/elements-of-keystone-service-catalog-entry.html
> 
> This hasn't made its way into the admin docs yet, though.
> 
> 
> Take care,
> 
> Lorin
> --
> Lorin Hochstein
> Lead Architect - Cloud Services
> Nimbis Services, Inc.
> www.nimbisservices.com
> 
> 
> 
> 
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