Hi. Thank you for your reply. The first one has a problem because each region is too soft. If a member is down, so this region is gone. It is so challenge with us. Nguyen Huu Khoi On Tue, Jul 18, 2023 at 2:34 PM Felix Huettner <felix.huettner@mail.schwarz> wrote:

Hi,

i think you have two options here: 1. you could span a single galera cluster over all of your regions. this might have some latency issues, but if your are not too write heavy that might be fine. I know some companies use that setup. 2. you use some kind of multiple galera clusters with replication. But i have not yet heard of anybody using this setup.

An alternative might be to have separate keystone setups with separate databases. This would probably reduce the error potential, but might not fit your usecase.

Thanks Felix

On Tue, Jul 18, 2023 at 12:07:12PM +0700, Nguyễn Hữu Khôi wrote:

...

Hello guys,

I am going to deploy openstack multi regions and I know that keystone replication is the most challenging.

I plan to set up 2 regions which use centralize galera cluster(3 nodes). and one standby edge galera cluster(3 nodes)

When region 1 is node available, I will map region 2 to use standby edge galera cluster.

I hope you give me some experience and advice with multi regions.

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