I've deployed openstack xena using kolla-ansible on centos 8 stream, I've used multiple controller nodes, a bunch of compute nodes and a storage cluster.

Controller nodes include network services.

I want to know how can I successfully set up redundancy between these controller nodes, in a way that some nodes are active while others are on standby state, and would only become active in case when the active nodes are to fail.

Thank you. Regards