Add ability to set 'Hostname' on a Service.

Signed-off-by: Nils Krabshuis <nils.krabshuis@redwood.com>

docker/models/services.py

@@ -96,6 +96,7 @@ class ServiceCollection(Collection):
                 access and load balance a service. Default: ``None``.
             env (list of str): Environment variables, in the form
                 ``KEY=val``.
+            hostname (string): Hostname to set on the container.
             labels (dict): Labels to apply to the service.
             log_driver (str): Log driver to use for containers.
             log_driver_options (dict): Log driver options.
@@ -176,6 +177,7 @@ CONTAINER_SPEC_KWARGS = [
     'command',
     'args',
     'env',
+    'hostname',
     'workdir',
     'user',
     'labels',

docker/types/services.py

@@ -70,6 +70,7 @@ class ContainerSpec(dict):
         image (string): The image name to use for the container.
         command (string or list):  The command to be run in the image.
         args (:py:class:`list`): Arguments to the command.
+        hostname (string): The hostname to set on the container.
         env (dict): Environment variables.
         dir (string): The working directory for commands to run in.
         user (string): The user inside the container.
@@ -82,9 +83,9 @@ class ContainerSpec(dict):
         secrets (list of py:class:`SecretReference`): List of secrets to be
             made available inside the containers.
     """
-    def __init__(self, image, command=None, args=None, env=None, workdir=None,
-                 user=None, labels=None, mounts=None, stop_grace_period=None,
-                 secrets=None):
+    def __init__(self, image, command=None, args=None, hostname=None, env=None,
+                workdir=None, user=None, labels=None, mounts=None,
+                stop_grace_period=None, secrets=None):
         self['Image'] = image
 
         if isinstance(command, six.string_types):
@@ -92,6 +93,8 @@ class ContainerSpec(dict):
         self['Command'] = command
         self['Args'] = args
 
+        if hostname is not None:
+            self['Hostname'] = hostname
         if env is not None:
             if isinstance(env, dict):
                 self['Env'] = format_environment(env)

tests/unit/models_services_test.py

@@ -9,6 +9,7 @@ class CreateServiceKwargsTest(unittest.TestCase):
             'command': 'true',
             'name': 'somename',
             'labels': {'key': 'value'},
+            'hostname': 'test_host',
             'mode': 'global',
             'update_config': {'update': 'config'},
             'networks': ['somenet'],
@@ -47,6 +48,6 @@ class CreateServiceKwargsTest(unittest.TestCase):
             'Options': {'foo': 'bar'}
         }
         assert set(task_template['ContainerSpec'].keys()) == set([
-            'Image', 'Command', 'Args', 'Env', 'Dir', 'User', 'Labels',
-            'Mounts', 'StopGracePeriod'
+            'Image', 'Command', 'Args', 'Hostname', 'Env', 'Dir', 'User',
+            'Labels', 'Mounts', 'StopGracePeriod'
         ])