Since 2016, the FEMDC SiG has been investigating how OpenStack could operate Edge Cloud infrastructures. Among the challenges that have been identified by the SiG, dealing with latency issues and network split brains is important for most OpenStack services.

In this presentation, we focus on how they impact the Keystone Identity Service. Keystone offers different deployment approaches, from a centralized one, to a federation, as well as a replication using database clustering. By varying the number of regions and latency between those regions, we compare the following deployments:

One centralized Keystone handling requests of all regions
A replicated Keystone using Galera Cluster to synchronize databases in the different regions
A replicated Keystone leveraging the NewSQL CockroachDB database
A federated Keystone

We present the methodology, results and identification of possible improvements towards a more decentralized management of the OpenStack services.

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