diff --git a/nova/conf/image_file_url.py b/nova/conf/image_file_url.py
index 1eb7727dd924..eea37c177843 100644
--- a/nova/conf/image_file_url.py
+++ b/nova/conf/image_file_url.py
@@ -29,13 +29,36 @@ filesystems = cfg.ListOpt(
            'image_file_url:<list entry name> '
            'sections'))
 
+# NOTE(jbresnah) because the group under which these options are added is
+# dyncamically determined these options need to stay out of global space
+# or they will confuse generate_sample.sh
+filesystem_opts = [
+     cfg.StrOpt('id',
+                help=_('A unique ID given to each file system.  This is '
+                       'value is set in Glance and agreed upon here so '
+                       'that the operator knowns they are dealing with '
+                       'the same file system.')),
+     cfg.StrOpt('mountpoint',
+                help=_('The path at which the file system is mounted.')),
+]
+
 ALL_OPTS = [filesystems]
 
 
 def register_opts(conf):
     conf.register_group(image_file_url_group)
     conf.register_opts(ALL_OPTS, group=image_file_url_group)
+    for fs in conf.image_file_url.filesystems:
+        group_name = 'image_file_url:' + fs
+        conf.register_opts(filesystem_opts, group=group_name)
 
 
 def list_opts():
+    # NOTE(markus_z): As the "filesystem" opt has an empty list as a default
+    # value and this value is necessary for a correct group name, we cannot
+    # list the "filesystem_opts" for the "nova.conf.sample" file here. A
+    # follow up patch will deprecate those. Due to their dynamic creation
+    # they never got shown in "nova.conf.sample" nor the config reference
+    # manual. I see no need to change this here with a dummy group or somehing
+    # like that.
     return {image_file_url_group: ALL_OPTS}
diff --git a/nova/image/download/file.py b/nova/image/download/file.py
index 308465044d66..7f6dba43e44d 100644
--- a/nova/image/download/file.py
+++ b/nova/image/download/file.py
@@ -13,7 +13,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from oslo_config import cfg
 from oslo_log import log as logging
 
 import nova.conf
@@ -63,19 +62,6 @@ class FileTransfer(xfer_base.TransferBase):
 
     desc_required_keys = ['id', 'mountpoint']
 
-    # NOTE(jbresnah) because the group under which these options are added is
-    # dyncamically determined these options need to stay out of global space
-    # or they will confuse generate_sample.sh
-    filesystem_opts = [
-         cfg.StrOpt('id',
-                    help=_('A unique ID given to each file system.  This is '
-                           'value is set in Glance and agreed upon here so '
-                           'that the operator knowns they are dealing with '
-                           'the same file system.')),
-         cfg.StrOpt('mountpoint',
-                    help=_('The path at which the file system is mounted.')),
-    ]
-
     def _get_options(self):
         fs_dict = {}
         for fs in CONF.image_file_url.filesystems:
@@ -89,12 +75,6 @@ class FileTransfer(xfer_base.TransferBase):
             fs_dict[CONF[group_name].id] = CONF[group_name]
         return fs_dict
 
-    def __init__(self):
-        # create the needed options
-        for fs in CONF.image_file_url.filesystems:
-            group_name = 'image_file_url:' + fs
-            CONF.register_opts(self.filesystem_opts, group=group_name)
-
     def _verify_config(self):
         for fs_key in self.filesystems:
             for r in self.desc_required_keys:
diff --git a/nova/tests/unit/image/test_transfer_modules.py b/nova/tests/unit/image/test_transfer_modules.py
index af7bc96e90ed..03b184f996c3 100644
--- a/nova/tests/unit/image/test_transfer_modules.py
+++ b/nova/tests/unit/image/test_transfer_modules.py
@@ -16,10 +16,13 @@
 import mock
 import six.moves.urllib.parse as urlparse
 
+import nova.conf
 from nova import exception
 from nova.image.download import file as tm_file
 from nova import test
 
+CONF = nova.conf.CONF
+
 
 class TestFileTransferModule(test.NoDBTestCase):
 
@@ -27,6 +30,8 @@ class TestFileTransferModule(test.NoDBTestCase):
     def test_filesystem_success(self, copy_mock):
         self.flags(allowed_direct_url_schemes=['file'], group='glance')
         self.flags(group='image_file_url', filesystems=['gluster'])
+        # register opts for dynamically created group 'image_file_url:gluster'
+        nova.conf.image_file_url.register_opts(CONF)
 
         mountpoint = '/gluster'
         url = 'file:///gluster/my/image/path'
@@ -52,6 +57,8 @@ class TestFileTransferModule(test.NoDBTestCase):
     def test_filesystem_mismatched_mountpoint(self, copy_mock):
         self.flags(allowed_direct_url_schemes=['file'], group='glance')
         self.flags(group='image_file_url', filesystems=['gluster'])
+        # register opts for dynamically created group 'image_file_url:gluster'
+        nova.conf.image_file_url.register_opts(CONF)
 
         mountpoint = '/gluster'
         # Should include the mountpoint before my/image/path
@@ -78,6 +85,8 @@ class TestFileTransferModule(test.NoDBTestCase):
     def test_filesystem_mismatched_filesystem(self, copy_mock):
         self.flags(allowed_direct_url_schemes=['file'], group='glance')
         self.flags(group='image_file_url', filesystems=['gluster'])
+        # register opts for dynamically created group 'image_file_url:gluster'
+        nova.conf.image_file_url.register_opts(CONF)
 
         mountpoint = '/gluster'
         # Should include the mountpoint before my/image/path