diff --git a/compose/config/config.py b/compose/config/config.py
index 243529bd6..55e8c2757 100644
--- a/compose/config/config.py
+++ b/compose/config/config.py
@@ -423,20 +423,39 @@ def load_mapping(config_files, get_func, entity_type, working_dir=None):
                 elif not config.get('name'):
                     config['name'] = name
 
-            if 'driver_opts' in config:
-                config['driver_opts'] = build_string_dict(
-                    config['driver_opts']
-                )
-
             if 'labels' in config:
                 config['labels'] = parse_labels(config['labels'])
 
             if 'file' in config:
                 config['file'] = expand_path(working_dir, config['file'])
 
+            if 'driver_opts' in config:
+                config['driver_opts'] = build_string_dict(
+                    config['driver_opts']
+                )
+                device = format_device_option(entity_type, config)
+                if device:
+                    config['driver_opts']['device'] = device
     return mapping
 
 
+def format_device_option(entity_type, config):
+    if entity_type != 'Volume':
+        return
+    # default driver is 'local'
+    driver = config.get('driver', 'local')
+    if driver != 'local':
+        return
+    o = config['driver_opts'].get('o')
+    device = config['driver_opts'].get('device')
+    if o and o == 'bind' and device:
+        fullpath = os.path.abspath(os.path.expanduser(device))
+        if not os.path.exists(fullpath):
+            raise ConfigurationError(
+                "Device path {} does not exist.".format(fullpath))
+        return fullpath
+
+
 def validate_external(entity_type, name, config, version):
     for k in config.keys():
         if entity_type == 'Network' and k == 'driver':
@@ -1114,6 +1133,7 @@ def merge_deploy(base, override):
         md['resources'] = dict(resources_md)
     if md.needs_merge('placement'):
         placement_md = MergeDict(md.base.get('placement') or {}, md.override.get('placement') or {})
+        placement_md.merge_scalar('max_replicas_per_node')
         placement_md.merge_field('constraints', merge_unique_items_lists, default=[])
         placement_md.merge_field('preferences', merge_unique_objects_lists, default=[])
         md['placement'] = dict(placement_md)
diff --git a/compose/config/config_schema_compose_spec.json b/compose/config/config_schema_compose_spec.json
index 8af7faa63..43d3a3edf 100644
--- a/compose/config/config_schema_compose_spec.json
+++ b/compose/config/config_schema_compose_spec.json
@@ -153,7 +153,7 @@
         "cpu_period": {"type": ["number", "string"]},
         "cpu_rt_period": {"type": ["number", "string"]},
         "cpu_rt_runtime": {"type": ["number", "string"]},
-        "cpus": {"type": "number", "minimum": 0},
+        "cpus": {"type": ["number", "string"]},
         "cpuset": {"type": "string"},
         "credential_spec": {
           "type": "object",
@@ -503,7 +503,7 @@
             "limits": {
               "type": "object",
               "properties": {
-                "cpus": {"type": "number", "minimum": 0},
+                "cpus": {"type": ["number", "string"]},
                 "memory": {"type": "string"}
               },
               "additionalProperties": false,
@@ -512,7 +512,7 @@
             "reservations": {
               "type": "object",
               "properties": {
-                "cpus": {"type": "number", "minimum": 0},
+                "cpus": {"type": ["number", "string"]},
                 "memory": {"type": "string"},
                 "generic_resources": {"$ref": "#/definitions/generic_resources"}
               },
diff --git a/compose/config/serialize.py b/compose/config/serialize.py
index 2dd2c47f1..2d9493a03 100644
--- a/compose/config/serialize.py
+++ b/compose/config/serialize.py
@@ -121,11 +121,6 @@ def denormalize_service_dict(service_dict, version, image_digest=None):
     if version == V1 and 'network_mode' not in service_dict:
         service_dict['network_mode'] = 'bridge'
 
-    if 'depends_on' in service_dict:
-        service_dict['depends_on'] = sorted([
-            svc for svc in service_dict['depends_on'].keys()
-        ])
-
     if 'healthcheck' in service_dict:
         if 'interval' in service_dict['healthcheck']:
             service_dict['healthcheck']['interval'] = serialize_ns_time_value(
diff --git a/compose/service.py b/compose/service.py
index 70939cac7..a1a500cb2 100644
--- a/compose/service.py
+++ b/compose/service.py
@@ -411,7 +411,7 @@ class Service:
         stopped = [c for c in containers if not c.is_running]
 
         if stopped:
-            return ConvergencePlan('start', stopped)
+            return ConvergencePlan('start', containers)
 
         return ConvergencePlan('noop', containers)
 
@@ -514,8 +514,9 @@ class Service:
             self._downscale(containers[scale:], timeout)
             containers = containers[:scale]
         if start:
+            stopped = [c for c in containers if not c.is_running]
             _, errors = parallel_execute(
-                containers,
+                stopped,
                 lambda c: self.start_container_if_stopped(c, attach_logs=not detached, quiet=True),
                 lambda c: c.name,
                 "Starting",
diff --git a/tests/integration/project_test.py b/tests/integration/project_test.py
index 879701076..96929f209 100644
--- a/tests/integration/project_test.py
+++ b/tests/integration/project_test.py
@@ -1347,6 +1347,36 @@ class ProjectTest(DockerClientTestCase):
         project.up()
         assert len(project.containers()) == 3
 
+    def test_project_up_scale_with_stopped_containers(self):
+        config_data = build_config(
+            services=[{
+                'name': 'web',
+                'image': BUSYBOX_IMAGE_WITH_TAG,
+                'command': 'top',
+                'scale': 2
+            }]
+        )
+        project = Project.from_config(
+            name='composetest', config_data=config_data, client=self.client
+        )
+
+        project.up()
+        containers = project.containers()
+        assert len(containers) == 2
+
+        self.client.stop(containers[0].id)
+        project.up(scale_override={'web': 2})
+        containers = project.containers()
+        assert len(containers) == 2
+
+        self.client.stop(containers[0].id)
+        project.up(scale_override={'web': 3})
+        assert len(project.containers()) == 3
+
+        self.client.stop(containers[0].id)
+        project.up(scale_override={'web': 1})
+        assert len(project.containers()) == 1
+
     def test_initialize_volumes(self):
         vol_name = '{:x}'.format(random.getrandbits(32))
         full_vol_name = 'composetest_{}'.format(vol_name)
diff --git a/tests/integration/state_test.py b/tests/integration/state_test.py
index 5258e310c..8168cddf0 100644
--- a/tests/integration/state_test.py
+++ b/tests/integration/state_test.py
@@ -375,7 +375,7 @@ class ServiceStateTest(DockerClientTestCase):
 
         assert [c.is_running for c in containers] == [False, True]
 
-        assert ('start', containers[0:1]) == web.convergence_plan()
+        assert ('start', containers) == web.convergence_plan()
 
     def test_trigger_recreate_with_config_change(self):
         web = self.create_service('web', command=["top"])
diff --git a/tests/unit/config/config_test.py b/tests/unit/config/config_test.py
index 8b0d37526..b1586ae1f 100644
--- a/tests/unit/config/config_test.py
+++ b/tests/unit/config/config_test.py
@@ -2543,6 +2543,7 @@ web:
                 'labels': ['com.docker.compose.a=1', 'com.docker.compose.b=2'],
                 'mode': 'replicated',
                 'placement': {
+                    'max_replicas_per_node': 1,
                     'constraints': [
                         'node.role == manager', 'engine.labels.aws == true'
                     ],
@@ -2599,6 +2600,7 @@ web:
                 'com.docker.compose.c': '3'
             },
             'placement': {
+                'max_replicas_per_node': 1,
                 'constraints': [
                     'engine.labels.aws == true', 'engine.labels.dev == true',
                     'node.role == manager', 'node.role == worker'
@@ -5267,7 +5269,7 @@ def get_config_filename_for_files(filenames, subdir=None):
 
 
 class SerializeTest(unittest.TestCase):
-    def test_denormalize_depends_on_v3(self):
+    def test_denormalize_depends(self):
         service_dict = {
             'image': 'busybox',
             'command': 'true',
@@ -5277,27 +5279,7 @@ class SerializeTest(unittest.TestCase):
             }
         }
 
-        assert denormalize_service_dict(service_dict, VERSION) == {
-            'image': 'busybox',
-            'command': 'true',
-            'depends_on': ['service2', 'service3']
-        }
-
-    def test_denormalize_depends_on_v2_1(self):
-        service_dict = {
-            'image': 'busybox',
-            'command': 'true',
-            'depends_on': {
-                'service2': {'condition': 'service_started'},
-                'service3': {'condition': 'service_started'},
-            }
-        }
-
-        assert denormalize_service_dict(service_dict, VERSION) == {
-            'image': 'busybox',
-            'command': 'true',
-            'depends_on': ['service2', 'service3']
-        }
+        assert denormalize_service_dict(service_dict, VERSION) == service_dict
 
     def test_serialize_time(self):
         data = {