I have used the following guide: https://docs.openstack.org/install-guide/ (https://docs.openstack.org/install-gu...) to install: 1 controller + 1 compute node + 1 block storage node as virtual machines in oracle virtual Box using manual Installation.

I want to add 2 other controllers so that total number will be 3 controllers.

Is there any guide for that to do it manually (manual installation/expansion for other controllers) which would teach me how to add mariaDB galera cluster, HA proxy, APIs redundancy, ...... ?