This guide will help you to create magnum cluster from installing openstack to deploy magnum cluster.
This guide tested on CentOS 8 and OpenStack Train.
You have to edit globals.yml and init-runonce.sh in order to run in your environment.
https://docs.google.com/presentation/d/15VMVsNwwcodThAPnpcFukSiLxfujIHHqUOK4WIEgQgA/edit?usp=sharing