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Setting up a HA environment is already not well-documented, making that multi-region is even harder. We're currently in the middle of a new HA installation (one region though) and it's kind of messy. Digging through several blog posts and half-baked install guides to find a valid configuration is not easy.

I can point you this post (I haven't read it): https://blog.zhaw.ch/icclab/how-to-install-a-multi-region-devstack-part-1/

or to this conceptual overview from SUSE: https://documentation.suse.com/soc/9/html/suse-openstack-cloud-clm-all/HP3-0HA.html

Basically, you have to setup one HA cloud at each site and then wrap load balancers around them. It's not much of an answer, but hopefully it gives you an impression what steps are necessary to achieve that.