I reproduced the issue on my environment that "mariadb-server" and "mariadb-ingress" were not running after rebooting active controller and switching to another controller. So, mariadb services as fundamental services, were blocking other OpenStack services.
I reproduced the issue on my environment that "mariadb-server" and "mariadb-ingress" were not running after rebooting active controller and switching to another controller. So, mariadb services as fundamental services, were blocking other OpenStack services.
Debugging this issue for the cause...