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Hello, There is no single button upgrade in openstack. This is what we followed in our environment.

(1) Build a parallel environment 
(2) Migrate all work loads using [CloudFerry](https://github.com/MirantisWorkloadMobility/CloudFerry)
(3) Did a new installation in the old environment with desired release (Our case its Juno to Liberty)
(4) Bring back the migrated Workloades to new environment.

It need a clear plan and of course a MDT.

Regards