diff --git a/cinderclient/tests/unit/v3/test_attachments.py b/cinderclient/tests/unit/v3/test_attachments.py
index 2ac64862c..1802334ec 100644
--- a/cinderclient/tests/unit/v3/test_attachments.py
+++ b/cinderclient/tests/unit/v3/test_attachments.py
@@ -26,7 +26,8 @@ class AttachmentsTest(utils.TestCase):
         att = cs.attachments.create(
             'e84fda45-4de4-4ce4-8f39-fc9d3b0aa05e',
             {},
-            '557ad76c-ce54-40a3-9e91-c40d21665cc3')
+            '557ad76c-ce54-40a3-9e91-c40d21665cc3',
+            'null')
         cs.assert_called('POST', '/attachments')
         self.assertEqual(fakes.fake_attachment['attachment'], att)
 
diff --git a/cinderclient/tests/unit/v3/test_shell.py b/cinderclient/tests/unit/v3/test_shell.py
index 43fb097bf..cdf1f368f 100644
--- a/cinderclient/tests/unit/v3/test_shell.py
+++ b/cinderclient/tests/unit/v3/test_shell.py
@@ -324,6 +324,49 @@ class ShellTest(utils.TestCase):
         self.assertTrue(mock_find_volume.called)
         self.assert_called('POST', '/attachments', body=expected)
 
+    @ddt.data({'cmd': '1234 1233',
+               'body': {'instance_uuid': '1233',
+                        'connector': {},
+                        'volume_uuid': '1234',
+                        'mode': 'ro'}},
+              {'cmd': '1234 1233 '
+                      '--connect True '
+                      '--ip 10.23.12.23 --host server01 '
+                      '--platform x86_xx '
+                      '--ostype 123 '
+                      '--multipath true '
+                      '--mountpoint /123 '
+                      '--initiator aabbccdd',
+               'body': {'instance_uuid': '1233',
+                        'connector': {'ip': '10.23.12.23',
+                                      'host': 'server01',
+                                      'os_type': '123',
+                                      'multipath': 'true',
+                                      'mountpoint': '/123',
+                                      'initiator': 'aabbccdd',
+                                      'platform': 'x86_xx'},
+                        'volume_uuid': '1234',
+                        'mode': 'ro'}},
+              {'cmd': 'abc 1233',
+               'body': {'instance_uuid': '1233',
+                        'connector': {},
+                        'volume_uuid': '1234',
+                        'mode': 'ro'}})
+    @mock.patch('cinderclient.utils.find_resource')
+    @ddt.unpack
+    def test_attachment_create_with_mode(self, mock_find_volume, cmd, body):
+        mock_find_volume.return_value = volumes.Volume(self,
+                                                       {'id': '1234'},
+                                                       loaded=True)
+        command = ('--os-volume-api-version 3.54 '
+                   'attachment-create '
+                   '--mode ro ')
+        command += cmd
+        self.run_command(command)
+        expected = {'attachment': body}
+        self.assertTrue(mock_find_volume.called)
+        self.assert_called('POST', '/attachments', body=expected)
+
     @mock.patch.object(volumes.VolumeManager, 'findall')
     def test_attachment_create_duplicate_name_vol(self, mock_findall):
         found = [volumes.Volume(self, {'id': '7654', 'name': 'abc'},
diff --git a/cinderclient/v3/attachments.py b/cinderclient/v3/attachments.py
index e18bf9842..a0732a3b7 100644
--- a/cinderclient/v3/attachments.py
+++ b/cinderclient/v3/attachments.py
@@ -27,11 +27,14 @@ class VolumeAttachmentManager(base.ManagerWithFind):
     resource_class = VolumeAttachment
 
     @api_versions.wraps('3.27')
-    def create(self, volume_id, connector, instance_id):
+    def create(self, volume_id, connector, instance_id, mode='null'):
         """Create a attachment for specified volume."""
         body = {'attachment': {'volume_uuid': volume_id,
                                'instance_uuid': instance_id,
                                'connector': connector}}
+        if self.api_version >= api_versions.APIVersion("3.54"):
+            if mode and mode != 'null':
+                body['attachment']['mode'] = mode
         retval = self._create('/attachments', body, 'attachment')
         return retval.to_dict()
 
diff --git a/cinderclient/v3/shell.py b/cinderclient/v3/shell.py
index fc74399dc..d5114e122 100644
--- a/cinderclient/v3/shell.py
+++ b/cinderclient/v3/shell.py
@@ -2164,6 +2164,13 @@ def do_attachment_show(cs, args):
            metavar='<mountpoint>',
            default=None,
            help='Mountpoint volume will be attached at. Default=None.')
+@utils.arg('--mode',
+           metavar='<mode>',
+           default='null',
+           start_version='3.54',
+           help='Mode of attachment, rw, ro and null, where null '
+                'indicates we want to honor any existing '
+                'admin-metadata settings.  Default=null.')
 def do_attachment_create(cs, args):
     """Create an attachment for a cinder volume."""
 
@@ -2178,9 +2185,12 @@ def do_attachment_create(cs, args):
                      'multipath': args.multipath,
                      'mountpoint': args.mountpoint}
     volume = utils.find_volume(cs, args.volume)
+    mode = getattr(args, 'mode', 'null')
     attachment = cs.attachments.create(volume.id,
                                        connector,
-                                       args.server_id)
+                                       args.server_id,
+                                       mode)
+
     connector_dict = attachment.pop('connection_info', None)
     utils.print_dict(attachment)
     if connector_dict: