+backend: "keystone" # internal or keystone or tacacs
+# for keystone backend a comma separated list of user adn project _domain_name list can ba provided.
+# NBI will try authenticate with all of then if domain is not provided in the content of a POST token
+# user_domain_name: "default,ldap"
+# project_domain_name: "default,ldap"
+
+# Keystone config parameters are
+# auth_url: format https://<ip>:<port>/v3 # v3 is necessary
+# auth_host: ip address of keystone host.
+# auth_port: port number of keystone.
+# Provide either auth_url or (auth_host and auth_port)
+# service_username: "nbi"
+# service_password: "nbi"
+