If you don't mind loosing VMs and ressources:
Assuming you want to rollback from B to A:
1°/- Call for kolla-ansible destroy (remove B). 2°/- Call for kolla-ansible deploy (fresh install A). 3°/- Call for kolla-ansible mariadb_recovery (Restore A DB).
Or do you have something else in mind?
If you don't mind loosing VMs and ressources:
Assuming you want to rollback from B to A:
1°/- Call for kolla-ansible destroy (remove B).
2°/- Call for kolla-ansible deploy (fresh install A).
3°/- Call for kolla-ansible mariadb_recovery (Restore A DB).
Or do you have something else in mind?