Hi Midhunlal, If your infrastructure services which should have minimal 3 nodes to form a quorum (like RabbitMQ and Mariadb and potentially some additional services If you are using some) are running on controller nodes, you should have 3 controllers. If you are HW limited, you also can have 2 nodes, but you can expect some form of split-brain in future. If you still will have only 2 controllers, 1. you should consider to use mariadb arbitrator for mariadb (member of quorum, not replicating data) which should be in some third location 2. Handle cluster_partition_handling in rabbitmq config (probably autoheal for two nodes) Next you have to prepare some loadbalancer (haproxy, nginx , apache ? ), some HA solution (keepalived ? with virtualiP ) and add that two controllers as backends. Edit endpoints to point to HA virtualIP address of loadbalancer That's minimal I think. Michal Arbet Openstack Engineer Ultimum Technologies a.s. Na Poříčí 1047/26, 11000 Praha 1 Czech Republic +420 604 228 897 michal.arbet@ultimum.io *https://ultimum.io <https://ultimum.io/>* LinkedIn <https://www.linkedin.com/company/ultimum-technologies> | Twitter <https://twitter.com/ultimumtech> | Facebook <https://www.facebook.com/ultimumtechnologies/timeline> pá 20. 8. 2021 v 10:57 odesílatel Midhunlal Nb <midhunlaln66@gmail.com> napsal:

Hi Mohammed, If you have any documents or procedure for this set up ,then please share with me.

On Fri, Aug 20, 2021, 10:35 AM Mohammed Naser <mnaser@vexxhost.com> wrote:

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Most openstack services are stateless but a lot of the infrastructure services like RabbitMQ and MariaDB form a quorum therefore need at least 3 replicas or you might have a bad time if an outage occurs

On Fri, Aug 13, 2021 at 10:36 PM Midhunlal Nb <midhunlaln66@gmail.com> wrote:

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Hi team, I have a rocky installed openstack environment and it is working fine.In my set up I have;

1 controller node,2 compute nodes and 1 storage node.

Now we are planning to add 1 more controller node as standby.Is it possible to add 1 more controller node in existing set up? if it is possible ,anyone please share the procedure.

Thanks & Regards Midhunlal N B +918921245637

-- Mohammed Naser VEXXHOST, Inc.