diff --git a/devstack/settings b/devstack/settings
index 7a58d0c0..f549f8f0 100644
--- a/devstack/settings
+++ b/devstack/settings
@@ -22,7 +22,7 @@ QINLING_CONF_FILE=${QINLING_CONF_DIR}/qinling.conf
 QINLING_POLICY_FILE=${QINLING_CONF_DIR}/policy.json
 QINLING_AUTH_CACHE_DIR=${QINLING_AUTH_CACHE_DIR:-/var/cache/qinling}
 QINLING_FUNCTION_STORAGE_DIR=${QINLING_FUNCTION_STORAGE_DIR:-/opt/qinling/function/packages}
-QINLING_PYTHON_RUNTIME_IMAGE=${QINLING_PYTHON_RUNTIME_IMAGE:-openstackqinling/python-runtime:0.0.4}
+QINLING_PYTHON_RUNTIME_IMAGE=${QINLING_PYTHON_RUNTIME_IMAGE:-openstackqinling/python-runtime:0.0.5}
 QINLING_NODEJS_RUNTIME_IMAGE=${QINLING_NODEJS_RUNTIME_IMAGE:-openstackqinling/nodejs-runtime:0.0.1}
 QINLING_SIDECAR_IMAGE=${QINLING_SIDECAR_IMAGE:-openstackqinling/sidecar:0.0.2}
 
diff --git a/example/functions/python/openstack/create_thumbnail.py b/example/functions/python/openstack/create_thumbnail.py
index 3d3bbac3..bf4c6898 100644
--- a/example/functions/python/openstack/create_thumbnail.py
+++ b/example/functions/python/openstack/create_thumbnail.py
@@ -17,45 +17,53 @@ import os
 
 from PIL import Image
 import swiftclient
+from swiftclient.exceptions import ClientException
 
 
 def resize_image(image_path, resized_path):
     with Image.open(image_path) as image:
-        image.thumbnail((75, 75))
+        image.thumbnail(tuple(x / 4 for x in image.size))
         image.save(resized_path)
 
 
-def main(context, container, object):
+def main(context, container_name, object_name):
     conn = swiftclient.Connection(
         session=context['os_session'],
         os_options={'region_name': 'RegionOne'},
     )
 
-    new_container = '%s_thumb' % container
-
-    # Download original photo
-    image_path = '/%s' % object
-    _, obj_contents = conn.get_object(container, object)
+    # Download original image
+    image_path = os.path.abspath('./%s' % object_name)
+    _, obj_contents = conn.get_object(container_name, object_name)
     with open(image_path, 'w') as local:
         local.write(obj_contents)
 
-    print('Downloaded object %s from container %s' % (object, container))
+    print('Downloaded object %s from container %s' %
+          (object_name, container_name))
 
-    thumb_path = '/thumb_%s' % object
+    thumb_path = os.path.abspath('./%s_resized.png' % object_name)
     resize_image(image_path, thumb_path)
 
     print('Resized.')
 
-    # Upload thumb photo
+    # Create new container if needed
+    new_container_name = '%s_resized' % container_name
+    try:
+        conn.head_container(new_container_name)
+    except ClientException:
+        conn.put_container(new_container_name)
+        print("New container %s created." % new_container_name)
+
+    # Upload resized image
     with open(thumb_path, 'r') as new_local:
         conn.put_object(
-            new_container,
-            object,
+            new_container_name,
+            object_name,
             contents=new_local,
             content_type='text/plain'
         )
-
     os.remove(image_path)
     os.remove(thumb_path)
 
-    print('Uploaded object %s to container %s' % (object, new_container))
+    print('Uploaded object %s to container %s' %
+          (object_name, new_container_name))
diff --git a/qinling_tempest_plugin/config.py b/qinling_tempest_plugin/config.py
index 9ffd1852..8e7dac16 100644
--- a/qinling_tempest_plugin/config.py
+++ b/qinling_tempest_plugin/config.py
@@ -40,7 +40,7 @@ QinlingGroup = [
                         'publicURL', 'adminURL', 'internalURL'],
                help="The endpoint type to use for the qinling service."),
     cfg.StrOpt("python_runtime_image",
-               default="openstackqinling/python-runtime:0.0.4",
+               default="openstackqinling/python-runtime:0.0.5",
                help="The Python runtime being used in the tests."),
     cfg.StrOpt("nodejs_runtime_image",
                default="openstackqinling/nodejs-runtime:0.0.1",
diff --git a/runtimes/python2/server.py b/runtimes/python2/server.py
index ea5cf839..acef5352 100644
--- a/runtimes/python2/server.py
+++ b/runtimes/python2/server.py
@@ -50,7 +50,8 @@ def _set_ulimit():
     customized_limits = {
         resource.RLIMIT_NOFILE: 1024,
         resource.RLIMIT_NPROC: 128,
-        resource.RLIMIT_FSIZE: 61440
+        # TODO(lxkong): 50M by default, need to be configurable in future.
+        resource.RLIMIT_FSIZE: 524288000
     }
     for t, soft in customized_limits.items():
         _, hard = resource.getrlimit(t)