diff --git a/sky/clouds/do.py b/sky/clouds/do.py
index cb30200e775..565b4469d42 100644
--- a/sky/clouds/do.py
+++ b/sky/clouds/do.py
@@ -192,8 +192,8 @@ def make_deploy_resources_variables(
         }
 
     def _get_feasible_launchable_resources(
-            self, resources: 'resources_lib.Resources'
-            ) -> resources_utils.FeasibleResources:
+        self, resources: 'resources_lib.Resources'
+    ) -> resources_utils.FeasibleResources:
         """Returns a list of feasible resources for the given resources."""
         if resources.use_spot:
             # TODO: Add hints to all return values in this method to help
@@ -253,13 +253,15 @@ def check_credentials(cls) -> Tuple[bool, Optional[str]]:
             # attempt to make a CURL request for listing instances
             do_utils.client().droplets.list()
         except do.exceptions().HttpResponseError as err:
-            return False, str(e)
+            return False, str(err)
 
         return True, None
 
     def get_credential_file_mounts(self) -> Dict[str, str]:
         do_utils.client()
-        return {f'~/.config/doctl/{_CREDENTIAL_FILE}': do_utils.CREDENTIALS_PATH}
+        return {
+            f'~/.config/doctl/{_CREDENTIAL_FILE}': do_utils.CREDENTIALS_PATH
+        }
 
     @classmethod
     def get_current_user_identity(cls) -> Optional[List[str]]:
diff --git a/sky/provision/do/instance.py b/sky/provision/do/instance.py
index 5c1fa1caa05..1293d93f172 100644
--- a/sky/provision/do/instance.py
+++ b/sky/provision/do/instance.py
@@ -19,7 +19,8 @@
 logger = sky_logging.init_logger(__name__)
 
 
-def _get_head_instance(instances: Dict[str, Dict[str, Any]]) -> Optional[Dict[str, Any]]:
+def _get_head_instance(
+        instances: Dict[str, Dict[str, Any]]) -> Optional[Dict[str, Any]]:
     for instance_name, instance_meta in instances.items():
         if instance_name.endswith('-head'):
             return instance_meta
@@ -290,6 +291,9 @@ def open_ports(
     provider_config: Optional[Dict[str, Any]] = None,
 ) -> None:
     """See sky/provision/__init__.py"""
+    logger.debug(
+        f'Skip opening ports {ports} for DigitalOcean instances, as all '
+        'ports are open by default.')
     del cluster_name_on_cloud, provider_config, ports