diff --git a/tripleo_common/constants.py b/tripleo_common/constants.py
new file mode 100644
index 000000000..f528de4fb
--- /dev/null
+++ b/tripleo_common/constants.py
@@ -0,0 +1,24 @@
+# Copyright 2015 Red Hat, Inc.
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+
+#: The name of the root template in a standard tripleo-heat-template layout.
+TEMPLATE_NAME = 'overcloud-without-mergepy.yaml'
+
+#: The name of the type for resource groups.
+RESOURCE_GROUP_TYPE = 'OS::Heat::ResourceGroup'
+
+#: The resource name used for package updates
+UPDATE_RESOURCE_NAME = 'UpdateDeployment'
diff --git a/tripleo_common/scale.py b/tripleo_common/scale.py
index 1516d9967..3292fa2a3 100644
--- a/tripleo_common/scale.py
+++ b/tripleo_common/scale.py
@@ -18,17 +18,17 @@ import logging
 import os
 
 from heatclient.common import template_utils
+
+from tripleo_common import constants
 from tripleo_common import update
 
 LOG = logging.getLogger(__name__)
-TEMPLATE_NAME = 'overcloud-without-mergepy.yaml'
-RESOURCE_GROUP_TYPE = 'OS::Heat::ResourceGroup'
 
 
 def get_group_resources_after_delete(groupname, res_to_delete, resources):
     group = next(res for res in resources if
                  res.resource_name == groupname and
-                 res.resource_type == RESOURCE_GROUP_TYPE)
+                 res.resource_type == constants.RESOURCE_GROUP_TYPE)
     members = []
     for res in resources:
         stack_name, stack_id = next(
@@ -95,7 +95,7 @@ class ScaleManager(object):
     def _update_stack(self, parameters={}, timeout_mins=240):
 
         tpl_files, template = template_utils.get_template_contents(
-            template_file=os.path.join(self.tht_dir, TEMPLATE_NAME))
+            template_file=os.path.join(self.tht_dir, constants.TEMPLATE_NAME))
 
         env_paths = []
         if self.environment_files:
diff --git a/tripleo_common/update.py b/tripleo_common/update.py
index d4df7f9e0..2a617620e 100644
--- a/tripleo_common/update.py
+++ b/tripleo_common/update.py
@@ -18,17 +18,18 @@ import os
 import time
 
 from heatclient.common import template_utils
+
 from tripleo_common import _stack_update
+from tripleo_common import constants
 
 LOG = logging.getLogger(__name__)
-TEMPLATE_NAME = 'overcloud-without-mergepy.yaml'
-UPDATE_RESOURCE_NAME = 'UpdateDeployment'
 
 
 def add_breakpoints_cleanup_into_env(env):
     template_utils.deep_update(env, {
         'resource_registry': {
-            'resources': {'*': {'*': {UPDATE_RESOURCE_NAME: {'hooks': []}}}}
+            'resources': {'*': {'*': {
+                constants.UPDATE_RESOURCE_NAME: {'hooks': []}}}}
         }
     })
 
@@ -42,7 +43,7 @@ class PackageUpdateManager(_stack_update.StackUpdateManager):
         super(PackageUpdateManager, self).__init__(
             heatclient=heatclient, novaclient=novaclient, stack=stack,
             hook_type='pre-update', nested_depth=5,
-            hook_resource=UPDATE_RESOURCE_NAME)
+            hook_resource=constants.UPDATE_RESOURCE_NAME)
 
     def update(self, timeout_mins=240):
         # time rounded to seconds
@@ -51,7 +52,7 @@ class PackageUpdateManager(_stack_update.StackUpdateManager):
         stack_params = {'UpdateIdentifier': timestamp}
 
         tpl_files, template = template_utils.get_template_contents(
-            template_file=os.path.join(self.tht_dir, TEMPLATE_NAME))
+            template_file=os.path.join(self.tht_dir, constants.TEMPLATE_NAME))
         env_paths = []
         if self.environment_files:
             env_paths.extend(self.environment_files)
@@ -63,7 +64,8 @@ class PackageUpdateManager(_stack_update.StackUpdateManager):
                 'resources': {
                     '*': {
                         '*': {
-                            UPDATE_RESOURCE_NAME: {'hooks': 'pre-update'}
+                            constants.UPDATE_RESOURCE_NAME: {
+                                'hooks': 'pre-update'}
                         }
                     }
                 }