I could not find any example/usage of v3tokenlessauth, using environment variables. There are no documents to be found. I assume we could need to have this one at least: export OS_AUTH_TYPE="v3tokenlessauth" What other environment variables are required if using this auth type? Would like to use HTTPs x509 auth. This is the only relevant doc found: https://docs.openstack.org/keystone/train/admin/configure_tokenless_x509.htm... [keystone_authtoken] memcached_servers = localhost:11211 cafile = /etc/keystone/ca.pem project_domain_name = Default project_name = service auth_url = https://192.168.0.10/identity/v3 auth_type = v3tokenlessauth certfile = /etc/glance/certs/glance.pem keyfile = /etc/glance/private/glance_private_key.pem But there are no environment variables mentioned in the above doc.