diff --git a/tempest/api/identity/admin/v3/test_trusts.py b/tempest/api/identity/admin/v3/test_trusts.py
index 0bded78..1bebad4 100644
--- a/tempest/api/identity/admin/v3/test_trusts.py
+++ b/tempest/api/identity/admin/v3/test_trusts.py
@@ -31,7 +31,7 @@
         if not CONF.identity_feature_enabled.trust:
             raise self.skipException("Trusts aren't enabled")
 
-        self.trustee_username = self.config.identity.alt_username
+        self.trustee_username = CONF.identity.alt_username
         self.trust_id = None
 
     def tearDown(self):
diff --git a/tempest/api/image/base.py b/tempest/api/image/base.py
index 2e69579..37b848c 100644
--- a/tempest/api/image/base.py
+++ b/tempest/api/image/base.py
@@ -17,10 +17,13 @@
 from tempest import clients
 from tempest.common import isolated_creds
 from tempest.common.utils import data_utils
+from tempest import config
 from tempest import exceptions
 from tempest.openstack.common import log as logging
 import tempest.test
 
+CONF = config.CONF
+
 LOG = logging.getLogger(__name__)
 
 
@@ -35,10 +38,10 @@
         cls._interface = 'json'
         cls.isolated_creds = isolated_creds.IsolatedCreds(
             cls.__name__, network_resources=cls.network_resources)
-        if not cls.config.service_available.glance:
+        if not CONF.service_available.glance:
             skip_msg = ("%s skipped as glance is not available" % cls.__name__)
             raise cls.skipException(skip_msg)
-        if cls.config.compute.allow_tenant_isolation:
+        if CONF.compute.allow_tenant_isolation:
             creds = cls.isolated_creds.get_primary_creds()
             username, tenant_name, password = creds
             cls.os = clients.Manager(username=username,
@@ -83,7 +86,7 @@
     def setUpClass(cls):
         super(BaseV1ImageTest, cls).setUpClass()
         cls.client = cls.os.image_client
-        if not cls.config.image_feature_enabled.api_v1:
+        if not CONF.image_feature_enabled.api_v1:
             msg = "Glance API v1 not supported"
             raise cls.skipException(msg)
 
@@ -92,7 +95,7 @@
     @classmethod
     def setUpClass(cls):
         super(BaseV1ImageMembersTest, cls).setUpClass()
-        if cls.config.compute.allow_tenant_isolation:
+        if CONF.compute.allow_tenant_isolation:
             creds = cls.isolated_creds.get_alt_creds()
             username, tenant_name, password = creds
             cls.os_alt = clients.Manager(username=username,
@@ -124,7 +127,7 @@
     def setUpClass(cls):
         super(BaseV2ImageTest, cls).setUpClass()
         cls.client = cls.os.image_client_v2
-        if not cls.config.image_feature_enabled.api_v2:
+        if not CONF.image_feature_enabled.api_v2:
             msg = "Glance API v2 not supported"
             raise cls.skipException(msg)
 
@@ -134,7 +137,7 @@
     @classmethod
     def setUpClass(cls):
         super(BaseV2MemberImageTest, cls).setUpClass()
-        if cls.config.compute.allow_tenant_isolation:
+        if CONF.compute.allow_tenant_isolation:
             creds = cls.isolated_creds.get_alt_creds()
             username, tenant_name, password = creds
             cls.os_alt = clients.Manager(username=username,