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What is the unique identifier of an openstack instance

Hi everyone,

I am new to Openstack and I am facing a challenge where I need to find out what can identify uniquelly an Openstack installation. I was thinking about the keystone since it's like a transit point for all services, but i couldn't clear out some questions like : what if there are multiple keystones for HA? how are they communicating ?

if anyone can help with this question I will be very thankful.

Regards,