diff --git a/doc/source/configuration/settings.rst b/doc/source/configuration/settings.rst
index 5bdaf99..15f46d6 100644
--- a/doc/source/configuration/settings.rst
+++ b/doc/source/configuration/settings.rst
@@ -35,7 +35,7 @@ file ``skyline.yaml.sample`` in ``etc`` directory.
         qos: neutron_qos
         vpnaas: neutron_vpn
       interface_type: public
-      keystone_url: http://localhost:5000/v3/
+      keystone_url: http://127.0.0.1:5000/v3/
       nginx_prefix: /api/openstack
       reclaim_instance_interval: 604800
       service_mapping:
diff --git a/etc/skyline.yaml.sample b/etc/skyline.yaml.sample
index c6f7961..ef41eab 100644
--- a/etc/skyline.yaml.sample
+++ b/etc/skyline.yaml.sample
@@ -24,7 +24,7 @@ openstack:
     qos: neutron_qos
     vpnaas: neutron_vpn
   interface_type: public
-  keystone_url: http://localhost:5000/v3/
+  keystone_url: http://127.0.0.1:5000/v3/
   nginx_prefix: /api/openstack
   reclaim_instance_interval: 604800
   service_mapping:
diff --git a/skyline_apiserver/config/openstack.py b/skyline_apiserver/config/openstack.py
index 23cdaba..fbf3afd 100644
--- a/skyline_apiserver/config/openstack.py
+++ b/skyline_apiserver/config/openstack.py
@@ -23,9 +23,12 @@ from skyline_apiserver.types import InterfaceType
 
 keystone_url = Opt(
     name="keystone_url",
-    description="Keystone endpoint address",
+    description=(
+        "Keystone endpoint address. If using domain, "
+        "top level domain is required. For example: example.org"
+    ),
     schema=HttpUrl,
-    default="http://localhost:5000/v3/",
+    default="http://127.0.0.1:5000/v3/",
 )
 
 system_project_domain = Opt(