That's great info. Thanks both. So to be clear, Karl, in your service catalog you see a single endpoint for Keystone and N endpoints (one per region) for Cinder, Nova etc? And tooling (OSC, SDK, etc.) is happy using one region for Keystone and potentially a different one for all other services? I would like to document this somewhere, so I'd like to make sure said docs reflect a real world scenario. If you had a service catalog you could share (with potentially sensitive info like URLs stripped out/anonymised) that would be helpful. Cheers, Stephen On Tue, 2024-10-15 at 22:19 +0000, Karl Kloppenborg wrote:
Hi Stephen, As Artem has pointed out, we’ve seen both. Some people also have a single keystone distributed across several regions using database replication. There’s pros and cons to all these deployments, however we personally use a centralised keystone and multiple regions with region specific endpoints. The downside of this is that loss of comms to the keystone makes multiple regions inaccessible however it doesn’t break customer compute workloads, so we absorb that as acceptable risk. Some others also do an A/B keystone behind keystone, I have also seen keystone presented more cleverly utilising anycast addressing and database replication, which avoids the aforementioned situation. Thanks, Karl Kloppenborg.
Karl Kloppenborg
Chief Technology Officer
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From:Artem Goncharov <artem.goncharov@gmail.com> Date: Tuesday, 15 October 2024 at 10:36 pm To: Stephen Finucane <stephenfin@redhat.com> Cc: openstack-discuss <openstack-discuss@lists.openstack.org> Subject: Re: [keystone] What does a multi-region service catalog look like?
Short answer Stephen, there can be both (and I've seen both), but typically there is single keystone for multiple non-identity regions.
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On Tue, Oct 15, 2024, 13:33 Stephen Finucane <stephenfin@redhat.com> wrote:
o/
The question in $subject came up in a discussion earlier today and I neither knew the answer nor was able to discover it by looking at a service catalogs for a few production deployments I have access to (also, the multi-region feature is currently broken in DevStack and likely has been for some time). Crucially, in a "standard" multi-region deployment where there is one Keystone instances and N Nova/Cinder/Glance/Neutron/... deployments, would I have something like the below, where there is only one identity endpoint but multiple e.g. compute endpoints, or would I expect there always to be as many identity endpoints as there are e.g. compute endpoints?
{ "token": { ... "catalog": [ { "endpoints": [ { "id": "fb757b386a23430d8f4d636b8b45fa89", "interface": "public", "region_id": "RegionOne", "url": "http://10.0.110.125/identity", "region": "RegionOne" } ], "id": "50c4feff9d6149b898fce20ce23904a3", "type": "identity", "name": "keystone" }, { "endpoints": [ { "id": "2ed0cb59adb0415c948f8351b6546d3e", "interface": "public", "region_id": "RegionOne", "url": "http://10.0.110.125/compute/v2.1", "region": "RegionOne" }, { "id": "2ed0cb59adb0415c948f8351b6546d3e", "interface": "public", "region_id": "RegionTwo", "url": "http://10.0.112.232/compute/v2.1", "region": "RegionOne" } ], "id": "87322637c5ab4e7b90bea7a8c1eb9525", "type": "compute", "name": "nova" }, ... ] } }
I'm guessing the latter, but I'd like to confirm this.
Stephen
