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Hi,

What do you mean by high level journaling / syncrronsation?

For me one of the basic differences between option 1 and 2 is the understanding of the data semantics during the synchronisaiton in case of option 1 and synchronising blobs of data in case of option 2.

Can you share what data do you synchronise between the Keystone instances? This is also a piece of information what we are looking for.

Thanks,
Gerg0

From: Waines, Greg [mailto:Greg.Waines at windriver.com]
Sent: Wednesday, June 6, 2018 3:44 PM
To: edge-computing at lists.openstack.org
Subject: [Edge-computing] Keystone Edge Architectures

Hey ... just taking a look at the options in https://wiki.openstack.org/wiki/Keystone_edge_architectures .

For the first option, i.e. ‘Several keystone instances with federation with API synchronsation’

  *   I am assuming that the Keystone Instance at each Edge Cloud Instance is communicating with a non-local central Identity Provider
  *   If this is the case, the concern list above related to operability with no connectivity
     *   i.e. “There may be significant times with no connectivity and all functions (e.g. autoscaling) must continue to function”

In the ‘Distributed Cloud’ sub-project of the StarlingX project
( i.e. see summit presentation @ https://www.openstack.org/videos/vancouver-2018/edge-computing-operations-day-1-deployment-and-day-2-management )

  *   our initial keystone approach is simply the standard multi-region centralized shared keystone,
so no scalability and no autonomy for edge clouds on loss of connectivity,
  *
  *   BUT we are currently taking more of the ‘second option’ approach (i.e. ‘Keystone database replication’) ... with some additions
i.e.
     *   Every Edge Cloud instance runs its own keystone instance,
     *   Keystone resources are replicated from central site to edge clouds using our distribute-cloud-replication-framework,
        *   i.e. projects, users, groups, domains, roles, ...
        *   ( i.e. not a low-level DB synchronization ... more a high-level journaling / synchronization of resources )
     *   AND
     *   Also supporting Fernet Key synchronization and management across Edge Clouds in order to enable Tokens created at any
Edge / Central cloud being able to be used (and authenticated) in any other clouds.
        *   Required for some distributed services scenarios,
e.g. glance-api  pulling from a remote glance-registry, etc.     (likely for future scenarios we don’t currently understand).

Comments ?

Greg.
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