diff --git a/magnum/common/keystone.py b/magnum/common/keystone.py
index be397f03ec..682d0e90fa 100644
--- a/magnum/common/keystone.py
+++ b/magnum/common/keystone.py
@@ -103,8 +103,8 @@ class KeystoneClientV3(object):
         LOG.warning(_LW('Auth plugin and its options for service user '
                         'must be provided in [%(new)s] section. '
                         'Using values from [%(old)s] section is '
-                        'deprecated.') % {'new': ksconf.CFG_GROUP,
-                                          'old': ksconf.CFG_LEGACY_GROUP})
+                        'deprecated.'), {'new': ksconf.CFG_GROUP,
+                                         'old': ksconf.CFG_LEGACY_GROUP})
 
         conf = getattr(CONF, ksconf.CFG_LEGACY_GROUP)
 
diff --git a/magnum/tests/functional/api/v1/clients/bay_client.py b/magnum/tests/functional/api/v1/clients/bay_client.py
index 5ae9ecdf7c..7ca7c7a242 100644
--- a/magnum/tests/functional/api/v1/clients/bay_client.py
+++ b/magnum/tests/functional/api/v1/clients/bay_client.py
@@ -123,7 +123,7 @@ class BayClient(client.MagnumClient):
                 lambda: self.does_bay_exist(bay_id), 10, 1800)
         except Exception:
             # In error state.  Clean up the bay id if desired
-            self.LOG.error(_LE('Bay %s entered an exception state.') % bay_id)
+            self.LOG.error(_LE('Bay %s entered an exception state.'), bay_id)
             if delete_on_error:
                 self.LOG.error(_LE('We will attempt to delete bays now.'))
                 self.delete_bay(bay_id)
@@ -139,35 +139,35 @@ class BayClient(client.MagnumClient):
             resp, model = self.get_bay(bay_id)
             if model.status in ['CREATED', 'CREATE_COMPLETE',
                                 'ERROR', 'CREATE_FAILED']:
-                self.LOG.info(_LI('Bay %s succeeded.') % bay_id)
+                self.LOG.info(_LI('Bay %s succeeded.'), bay_id)
                 return True
             else:
                 return False
         except exceptions.NotFound:
-            self.LOG.warning(_LW('Bay %s is not found.') % bay_id)
+            self.LOG.warning(_LW('Bay %s is not found.'), bay_id)
             return False
 
     def does_bay_exist(self, bay_id):
         try:
             resp, model = self.get_bay(bay_id)
             if model.status in ['CREATED', 'CREATE_COMPLETE']:
-                self.LOG.info(_LI('Bay %s is created.') % bay_id)
+                self.LOG.info(_LI('Bay %s is created.'), bay_id)
                 return True
             elif model.status in ['ERROR', 'CREATE_FAILED']:
-                self.LOG.error(_LE('Bay %s is in fail state.') % bay_id)
+                self.LOG.error(_LE('Bay %s is in fail state.'), bay_id)
                 raise exceptions.ServerFault(
                     "Got into an error condition: %s for %s" %
                     (model.status, bay_id))
             else:
                 return False
         except exceptions.NotFound:
-            self.LOG.warning(_LW('Bay %s is not found.') % bay_id)
+            self.LOG.warning(_LW('Bay %s is not found.'), bay_id)
             return False
 
     def does_bay_not_exist(self, bay_id):
         try:
             self.get_bay(bay_id)
         except exceptions.NotFound:
-            self.LOG.warning(_LW('Bay %s is not found.') % bay_id)
+            self.LOG.warning(_LW('Bay %s is not found.'), bay_id)
             return True
         return False
diff --git a/magnum/tests/functional/api/v1/clients/cluster_client.py b/magnum/tests/functional/api/v1/clients/cluster_client.py
index 9b39c9da4c..91609bd373 100644
--- a/magnum/tests/functional/api/v1/clients/cluster_client.py
+++ b/magnum/tests/functional/api/v1/clients/cluster_client.py
@@ -124,7 +124,7 @@ class ClusterClient(client.MagnumClient):
                 lambda: self.does_cluster_exist(cluster_id), 10, 1800)
         except Exception:
             # In error state.  Clean up the cluster id if desired
-            self.LOG.error(_LE('Cluster %s entered an exception state.') %
+            self.LOG.error(_LE('Cluster %s entered an exception state.'),
                            cluster_id)
             if delete_on_error:
                 self.LOG.error(_LE('We will attempt to delete clusters now.'))
@@ -141,22 +141,22 @@ class ClusterClient(client.MagnumClient):
             resp, model = self.get_cluster(cluster_id)
             if model.status in ['CREATED', 'CREATE_COMPLETE',
                                 'ERROR', 'CREATE_FAILED']:
-                self.LOG.info(_LI('Cluster %s succeeded.') % cluster_id)
+                self.LOG.info(_LI('Cluster %s succeeded.'), cluster_id)
                 return True
             else:
                 return False
         except exceptions.NotFound:
-            self.LOG.warning(_LW('Cluster %s is not found.') % cluster_id)
+            self.LOG.warning(_LW('Cluster %s is not found.'), cluster_id)
             return False
 
     def does_cluster_exist(self, cluster_id):
         try:
             resp, model = self.get_cluster(cluster_id)
             if model.status in ['CREATED', 'CREATE_COMPLETE']:
-                self.LOG.info(_LI('Cluster %s is created.') % cluster_id)
+                self.LOG.info(_LI('Cluster %s is created.'), cluster_id)
                 return True
             elif model.status in ['ERROR', 'CREATE_FAILED']:
-                self.LOG.error(_LE('Cluster %s is in fail state.') %
+                self.LOG.error(_LE('Cluster %s is in fail state.'),
                                cluster_id)
                 raise exceptions.ServerFault(
                     "Got into an error condition: %s for %s" %
@@ -164,13 +164,13 @@ class ClusterClient(client.MagnumClient):
             else:
                 return False
         except exceptions.NotFound:
-            self.LOG.warning(_LW('Cluster %s is not found.') % cluster_id)
+            self.LOG.warning(_LW('Cluster %s is not found.'), cluster_id)
             return False
 
     def does_cluster_not_exist(self, cluster_id):
         try:
             self.get_cluster(cluster_id)
         except exceptions.NotFound:
-            self.LOG.warning(_LW('Cluster %s is not found.') % cluster_id)
+            self.LOG.warning(_LW('Cluster %s is not found.'), cluster_id)
             return True
         return False
diff --git a/magnum/tests/functional/python_client_base.py b/magnum/tests/functional/python_client_base.py
index e7b04979f9..e253273369 100644
--- a/magnum/tests/functional/python_client_base.py
+++ b/magnum/tests/functional/python_client_base.py
@@ -303,7 +303,7 @@ extendedKeyUsage = clientAuth
             nodes = self._get_nodes_from_stack()
             if not [x for x in nodes if x]:
                 self.LOG.info(_LI("the list of nodes from stack is empty"))
-        self.LOG.info(_LI("Nodes are: %s") % nodes)
+        self.LOG.info(_LI("Nodes are: %s"), nodes)
         return nodes
 
     def _get_nodes_from_cluster(self):