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Unless it's a lab and you really want to learn, If you want to build a real production Cloud, you should not build it by hand like that. Look at deployment tools like :

  • openstack-ansible
  • tripleo
  • kolla-ansible

They handle high-availability deployment of controller nodes, with either keepalived+haproxy or pacemaker. Also, less easy, they configure MySQL and rabbitmq in cluster mode (galera for MySQL).

Of course, all services are configured to use the VIP (or a name that resolve to it).