diff --git a/releasenotes/source/index.rst b/releasenotes/source/index.rst
index 242d133..cea76b4 100644
--- a/releasenotes/source/index.rst
+++ b/releasenotes/source/index.rst
@@ -6,6 +6,7 @@
     :maxdepth: 1
 
     unreleased
+    v15.0.0
     v14.0.0
     v13.0.0
     v12.0.0
diff --git a/releasenotes/source/v15.0.0.rst b/releasenotes/source/v15.0.0.rst
new file mode 100644
index 0000000..2ee1894
--- /dev/null
+++ b/releasenotes/source/v15.0.0.rst
@@ -0,0 +1,6 @@
+=====================
+v15.0.0 Release Notes
+=====================
+
+.. release-notes:: 15.0.0 Release Notes
+   :version: 15.0.0
diff --git a/tempest/api/compute/admin/test_flavors_extra_specs.py b/tempest/api/compute/admin/test_flavors_extra_specs.py
index 8ec6400..ee1e3a0 100644
--- a/tempest/api/compute/admin/test_flavors_extra_specs.py
+++ b/tempest/api/compute/admin/test_flavors_extra_specs.py
@@ -41,7 +41,7 @@
         vcpus = 1
         disk = 10
         ephemeral = 10
-        cls.new_flavor_id = data_utils.rand_int_id(start=1000)
+        new_flavor_id = data_utils.rand_int_id(start=1000)
         swap = 1024
         rxtx = 1
         # Create a flavor so as to set/get/unset extra specs
@@ -49,7 +49,7 @@
             name=flavor_name,
             ram=ram, vcpus=vcpus,
             disk=disk,
-            id=cls.new_flavor_id,
+            id=new_flavor_id,
             ephemeral=ephemeral,
             swap=swap,
             rxtx_factor=rxtx)['flavor']
diff --git a/tempest/api/compute/admin/test_flavors_extra_specs_negative.py b/tempest/api/compute/admin/test_flavors_extra_specs_negative.py
index 79a9068..dab83e5 100644
--- a/tempest/api/compute/admin/test_flavors_extra_specs_negative.py
+++ b/tempest/api/compute/admin/test_flavors_extra_specs_negative.py
@@ -43,7 +43,7 @@
         vcpus = 1
         disk = 10
         ephemeral = 10
-        cls.new_flavor_id = data_utils.rand_int_id(start=1000)
+        new_flavor_id = data_utils.rand_int_id(start=1000)
         swap = 1024
         rxtx = 1
         # Create a flavor
@@ -51,7 +51,7 @@
             name=flavor_name,
             ram=ram, vcpus=vcpus,
             disk=disk,
-            id=cls.new_flavor_id,
+            id=new_flavor_id,
             ephemeral=ephemeral,
             swap=swap,
             rxtx_factor=rxtx)['flavor']
diff --git a/tempest/api/compute/servers/test_create_server.py b/tempest/api/compute/servers/test_create_server.py
index 5ddae5e..a94c20b 100644
--- a/tempest/api/compute/servers/test_create_server.py
+++ b/tempest/api/compute/servers/test_create_server.py
@@ -51,7 +51,7 @@
         cls.name = data_utils.rand_name(cls.__name__ + '-server')
         cls.password = data_utils.rand_password()
         disk_config = cls.disk_config
-        cls.server_initial = cls.create_test_server(
+        server_initial = cls.create_test_server(
             validatable=True,
             wait_until='ACTIVE',
             name=cls.name,
@@ -60,7 +60,7 @@
             accessIPv6=cls.accessIPv6,
             disk_config=disk_config,
             adminPass=cls.password)
-        cls.server = (cls.client.show_server(cls.server_initial['id'])
+        cls.server = (cls.client.show_server(server_initial['id'])
                       ['server'])
 
     def _create_net_subnet_ret_net_from_cidr(self, cidr):
diff --git a/tempest/api/compute/servers/test_server_rescue.py b/tempest/api/compute/servers/test_server_rescue.py
index f74a5a4..209ab38 100644
--- a/tempest/api/compute/servers/test_server_rescue.py
+++ b/tempest/api/compute/servers/test_server_rescue.py
@@ -50,9 +50,9 @@
 
         # Security group creation
         cls.sg_name = data_utils.rand_name('sg')
-        cls.sg_desc = data_utils.rand_name('sg-desc')
+        sg_desc = data_utils.rand_name('sg-desc')
         cls.sg = cls.security_groups_client.create_security_group(
-            name=cls.sg_name, description=cls.sg_desc)['security_group']
+            name=cls.sg_name, description=sg_desc)['security_group']
         cls.sg_id = cls.sg['id']
 
         cls.password = data_utils.rand_password()
diff --git a/tempest/api/volume/admin/test_multi_backend.py b/tempest/api/volume/admin/test_multi_backend.py
index f68f19a..1b97e4a 100644
--- a/tempest/api/volume/admin/test_multi_backend.py
+++ b/tempest/api/volume/admin/test_multi_backend.py
@@ -34,7 +34,7 @@
         super(VolumeMultiBackendV2Test, cls).resource_setup()
 
         # read backend name from a list .
-        cls.backend_names = set(CONF.volume.backend_names)
+        backend_names = set(CONF.volume.backend_names)
 
         cls.name_field = cls.special_fields['name_field']
         cls.volume_id_list_with_prefix = []
@@ -42,10 +42,10 @@
 
         # Volume/Type creation (uses volume_backend_name)
         # It is not allowed to create the same backend name twice
-        if len(cls.backend_names) < 2:
+        if len(backend_names) < 2:
             raise cls.skipException("Requires at least two different "
                                     "backend names")
-        for backend_name in cls.backend_names:
+        for backend_name in backend_names:
             # Volume/Type creation (uses backend_name)
             cls._create_type_and_volume(backend_name, False)
             # Volume/Type creation (uses capabilities:volume_backend_name)
diff --git a/tempest/api/volume/admin/test_volume_retype_with_migration.py b/tempest/api/volume/admin/test_volume_retype_with_migration.py
index dc509de..4d32fdd 100644
--- a/tempest/api/volume/admin/test_volume_retype_with_migration.py
+++ b/tempest/api/volume/admin/test_volume_retype_with_migration.py
@@ -40,16 +40,16 @@
     def resource_setup(cls):
         super(VolumeRetypeWithMigrationV2Test, cls).resource_setup()
         # read backend name from a list.
-        cls.backend_src = CONF.volume.backend_names[0]
-        cls.backend_dst = CONF.volume.backend_names[1]
+        backend_src = CONF.volume.backend_names[0]
+        backend_dst = CONF.volume.backend_names[1]
 
-        extra_specs_src = {"volume_backend_name": cls.backend_src}
-        extra_specs_dst = {"volume_backend_name": cls.backend_dst}
+        extra_specs_src = {"volume_backend_name": backend_src}
+        extra_specs_dst = {"volume_backend_name": backend_dst}
 
-        cls.src_vol_type = cls.create_volume_type(extra_specs=extra_specs_src)
+        src_vol_type = cls.create_volume_type(extra_specs=extra_specs_src)
         cls.dst_vol_type = cls.create_volume_type(extra_specs=extra_specs_dst)
 
-        cls.src_vol = cls.create_volume(volume_type=cls.src_vol_type['name'])
+        cls.src_vol = cls.create_volume(volume_type=src_vol_type['name'])
 
     @classmethod
     def resource_cleanup(cls):
diff --git a/tempest/api/volume/admin/test_volume_types.py b/tempest/api/volume/admin/test_volume_types.py
index 7938604..213723c 100644
--- a/tempest/api/volume/admin/test_volume_types.py
+++ b/tempest/api/volume/admin/test_volume_types.py
@@ -36,7 +36,7 @@
         # Create/update/get/delete volume with volume_type and extra spec.
         volume_types = list()
         vol_name = data_utils.rand_name(self.__class__.__name__ + '-volume')
-        self.name_field = self.special_fields['name_field']
+        name_field = self.special_fields['name_field']
         proto = CONF.volume.storage_protocol
         vendor = CONF.volume.vendor_name
         extra_specs = {"storage_protocol": proto,
@@ -46,14 +46,14 @@
             vol_type = self.create_volume_type(
                 extra_specs=extra_specs)
             volume_types.append(vol_type)
-        params = {self.name_field: vol_name,
+        params = {name_field: vol_name,
                   'volume_type': volume_types[0]['id'],
                   'size': CONF.volume.volume_size}
 
         # Create volume
         volume = self.create_volume(**params)
         self.assertEqual(volume_types[0]['name'], volume["volume_type"])
-        self.assertEqual(volume[self.name_field], vol_name,
+        self.assertEqual(volume[name_field], vol_name,
                          "The created volume name is not equal "
                          "to the requested name")
         self.assertIsNotNone(volume['id'],
@@ -74,7 +74,7 @@
                          fetched_volume['volume_type'],
                          'The fetched Volume type is different '
                          'from updated volume type')
-        self.assertEqual(vol_name, fetched_volume[self.name_field],
+        self.assertEqual(vol_name, fetched_volume[name_field],
                          'The fetched Volume is different '
                          'from the created Volume')
         self.assertEqual(volume['id'], fetched_volume['id'],
diff --git a/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py b/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py
index 933b6ad..1dce7e0 100644
--- a/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py
+++ b/tempest/api/volume/admin/test_volume_types_extra_specs_negative.py
@@ -24,8 +24,8 @@
     @classmethod
     def resource_setup(cls):
         super(ExtraSpecsNegativeV2Test, cls).resource_setup()
-        cls.extra_specs = {"spec1": "val1"}
-        cls.volume_type = cls.create_volume_type(extra_specs=cls.extra_specs)
+        extra_specs = {"spec1": "val1"}
+        cls.volume_type = cls.create_volume_type(extra_specs=extra_specs)
 
     @decorators.idempotent_id('08961d20-5cbb-4910-ac0f-89ad6dbb2da1')
     def test_update_no_body(self):
diff --git a/tempest/api/volume/admin/test_volume_types_negative.py b/tempest/api/volume/admin/test_volume_types_negative.py
index b278127..e8694b2 100644
--- a/tempest/api/volume/admin/test_volume_types_negative.py
+++ b/tempest/api/volume/admin/test_volume_types_negative.py
@@ -24,8 +24,8 @@
     @decorators.idempotent_id('b48c98f2-e662-4885-9b71-032256906314')
     def test_create_with_nonexistent_volume_type(self):
         # Should not be able to create volume with nonexistent volume_type.
-        self.name_field = self.special_fields['name_field']
-        params = {self.name_field: data_utils.rand_uuid(),
+        name_field = self.special_fields['name_field']
+        params = {name_field: data_utils.rand_uuid(),
                   'volume_type': data_utils.rand_uuid()}
         self.assertRaises(lib_exc.NotFound,
                           self.volumes_client.create_volume, **params)
diff --git a/tempest/api/volume/test_volumes_snapshots_list.py b/tempest/api/volume/test_volumes_snapshots_list.py
index ff390ea..a0eaa00 100644
--- a/tempest/api/volume/test_volumes_snapshots_list.py
+++ b/tempest/api/volume/test_volumes_snapshots_list.py
@@ -28,11 +28,11 @@
     @classmethod
     def resource_setup(cls):
         super(VolumesV2SnapshotListTestJSON, cls).resource_setup()
-        cls.volume_origin = cls.create_volume()
+        volume_origin = cls.create_volume()
         cls.name_field = cls.special_fields['name_field']
         # Create snapshots with params
         for _ in range(2):
-            cls.snapshot = cls.create_snapshot(cls.volume_origin['id'])
+            cls.snapshot = cls.create_snapshot(volume_origin['id'])
 
     def _list_by_param_values_and_assert(self, with_detail=False, **params):
         """list or list_details with given params and validates result."""
diff --git a/tempest/api/volume/v2/test_volumes_list.py b/tempest/api/volume/v2/test_volumes_list.py
index 4776545..8b51e64 100644
--- a/tempest/api/volume/v2/test_volumes_list.py
+++ b/tempest/api/volume/v2/test_volumes_list.py
@@ -37,13 +37,13 @@
         super(VolumesV2ListTestJSON, cls).resource_setup()
 
         # Create 3 test volumes
-        cls.metadata = {'Type': 'work'}
+        metadata = {'Type': 'work'}
         # NOTE(zhufl): When using pre-provisioned credentials, the project
         # may have volumes other than those created below.
         existing_volumes = cls.volumes_client.list_volumes()['volumes']
         cls.volume_id_list = [vol['id'] for vol in existing_volumes]
         for _ in range(3):
-            volume = cls.create_volume(metadata=cls.metadata)
+            volume = cls.create_volume(metadata=metadata)
             cls.volume_id_list.append(volume['id'])
 
     @decorators.idempotent_id('2a7064eb-b9c3-429b-b888-33928fc5edd3')
diff --git a/tempest/api/volume/v2/test_volumes_snapshots_list.py b/tempest/api/volume/v2/test_volumes_snapshots_list.py
index e2f11e8..d385f65 100644
--- a/tempest/api/volume/v2/test_volumes_snapshots_list.py
+++ b/tempest/api/volume/v2/test_volumes_snapshots_list.py
@@ -33,10 +33,10 @@
         super(VolumesV2SnapshotListTestJSON, cls).resource_setup()
         cls.snapshot_id_list = []
         # Create a volume
-        cls.volume_origin = cls.create_volume()
+        volume_origin = cls.create_volume()
         # Create 3 snapshots
         for _ in range(3):
-            snapshot = cls.create_snapshot(cls.volume_origin['id'])
+            snapshot = cls.create_snapshot(volume_origin['id'])
             cls.snapshot_id_list.append(snapshot['id'])
 
     def _list_snapshots_param_sort(self, sort_key, sort_dir):