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Is it possible to migrate openstack data - projects, users, instances - between two clouds (Mirantis Openstack w/fuel to 'vanilla' (not Mirantis) Kilo)?

Pumphouse - tool for migration developed by Mirantis - doesn't work properly in this instance.

I thought about two solutions- migrating 'by hand' by re-creating the environment via API, but that will change all UIDs, and migration via databases, which would be extremely complicated and would include changing some of the records on the fly.

Is there any ready automated or semi-automated way this could be done? :)

Installations can use shared storage, so it's really just about the metadata, from one cloud to another.