Nova added support for keystone unified limits [1] and some configuration is needed to enable it. In nova.conf on controllers, the following settings are needed: [quota] count_usage_from_placement = True driver = nova.quota.UnifiedLimitsDriver We will want to provide a tripleo parameter 'use_keystone_limits' which sets up nova.conf. The same parameter has already been added for the glance service [2], so that work can serve as a guide. [1] https://bugzilla.redhat.com/show_bug.cgi?id=1761833 [2] https://bugzilla.redhat.com/show_bug.cgi?id=1980632