% openstack server list --os-cloud virtualdata
Cloud virtualdata was not found.
% mv ~/.config/openstack/cloud.yaml ~/.config/openstack/clouds.yaml
% openstack server list --os-cloud virtualdata
+--------------------------------------+----------
| ID | Name
+--------------------------------------+----------
| xxxxxxxxxxxxxxxxxxxxxxxx | xxxx
+--------------------------------------+----------
https://docs.openstack.org/python-openstackclient/latest/configuration/index.html