This sounds related to the discussion on the 'Nova clustered hypervisor 
driver' which started at Juno design summit [1]. Talking to another 
OpenStack should be similar to talking to vCenter. The idea was that the 
Cells support could be refactored around this notion as well. 
Not sure whether there have been any active progress with this in Juno, 



From:   joehuang <>
To:     "OpenStack Development Mailing List (not for usage questions)" 
Date:   30/09/2014 04:08 PM
Subject:        [openstack-dev] [all] [tc] Multi-clouds integration by 
OpenStack cascading

Hello, Dear TC and all, 

Large cloud operators prefer to deploy multiple OpenStack instances(as 
different zones), rather than a single monolithic OpenStack instance 
because of these reasons:
1) Multiple data centers distributed geographically;
2) Multi-vendor business policy;
3) Server nodes scale up modularized from 00's up to million;
4) Fault and maintenance isolation between zones (only REST interface);
At the same time, they also want to integrate these OpenStack instances 
into one cloud. Instead of proprietary orchestration layer, they want to 
use standard OpenStack framework for Northbound API compatibility with 
HEAT/Horizon or other 3rd ecosystem apps.
We call this pattern as "OpenStack Cascading", with proposal described by 
[1][2]. PoC live demo video can be found[3][4].
Nova, Cinder, Neutron, Ceilometer and Glance (optional) are involved in 
the OpenStack cascading. 
Kindly ask for cross program design summit session to discuss OpenStack 
cascading and the contribution to Kilo. 

Kindly invite those who are interested in the OpenStack cascading to work 
together and contribute it to OpenStack. 
(I applied for “other projects” track [5], but it would be better to 
have a discussion as a formal cross program session, because many core 
programs are involved )
[1] wiki:
[2] PoC source code:
[3] Live demo video at YouTube:
[4] Live demo video at Youku (low quality, for those who can't access 

Best Regards
Chaoyi Huang ( Joe Huang )
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