I’m looking at implementing dynamically-configured multi-region support for 
service federation, and the prior art on multi-region support in Horizon is 
pretty sketchy. This thread:
http://lists.openstack.org/pipermail/openstack/2014-January/004372.html
is the only real discussion I’ve found, and it’s pretty inconclusive.

More precisely, if I configure a single Horizon with AVAILABLE_REGIONS pointing 
at two different Keystones with region names “X” and “Y", and each of those 
Keystones returns a service catalog with multiple regions (“A” and “B” for one, 
“P”, “Q”, and “R” for the other), what’s Horizon going to do? Or rather, what’s 
it expected to do?

Yes, I’m being lazy: I could actually configure this to see what happens, but 
hopefully it was considered during the design.

Geoff

PS I’ve added Heat to the subject, because from a quick read of 
https://wiki.openstack.org/wiki/Heat/Blueprints/Multi_Region_Support_for_Heat 
it looks as if Heat won’t support the AVAILABLE_REGIONS model. That seems like 
an unfortunate disconnect.



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