@@ -158,6 +158,7 @@ func Service(
 			Placement: &swarm.Placement{
 				Constraints: service.Deploy.Placement.Constraints,
 				Preferences: getPlacementPreference(service.Deploy.Placement.Preferences),
+				MaxReplicas: service.Deploy.Placement.MaxReplicas,
 			},
 		},
 		EndpointSpec:   endpoint,
 
@@ -1,4 +1,4 @@
-version: "3.7"
+version: "3.8"
 
 services:
   foo:
@@ -82,6 +82,7 @@ services:
         window: 120s
       placement:
         constraints: [node=foo]
+        max_replicas_per_node: 5
         preferences:
           - spread: node.labels.az
       endpoint_mode: dnsrr
 
@@ -10,7 +10,7 @@ import (
 
 func fullExampleConfig(workingDir, homeDir string) *types.Config {
 	return &types.Config{
-		Version:  "3.7",
+		Version:  "3.8",
 		Services: services(workingDir, homeDir),
 		Networks: networks(),
 		Volumes:  volumes(),
@@ -111,6 +111,7 @@ func services(workingDir, homeDir string) []types.ServiceConfig {
 				},
 				Placement: types.Placement{
 					Constraints: []string{"node=foo"},
+					MaxReplicas: uint64(5),
 					Preferences: []types.PlacementPreferences{
 						{
 							Spread: "node.labels.az",
@@ -507,7 +508,7 @@ func secrets(workingDir string) map[string]types.SecretConfig {
 }
 
 func fullExampleYAML(workingDir string) string {
-	return fmt.Sprintf(`version: "3.7"
+	return fmt.Sprintf(`version: "3.8"
 services:
   foo:
     build:
@@ -588,6 +589,7 @@ services:
         - node=foo
         preferences:
         - spread: node.labels.az
+        max_replicas_per_node: 5
       endpoint_mode: dnsrr
     devices:
     - /dev/ttyUSB0:/dev/ttyUSB0
@@ -1083,7 +1085,8 @@ func fullExampleJSON(workingDir string) string {
             {
               "spread": "node.labels.az"
             }
-          ]
+          ],
+          "max_replicas_per_node": 5
         },
         "endpoint_mode": "dnsrr"
       },
@@ -1383,7 +1386,7 @@ func fullExampleJSON(workingDir string) string {
       "working_dir": "/code"
     }
   },
-  "version": "3.7",
+  "version": "3.8",
   "volumes": {
     "another-volume": {
       "name": "user_specified_name",
 
@@ -424,7 +424,8 @@
                 },
                 "additionalProperties": false
               }
-            }
+            },
+            "max_replicas_per_node": {"type": "integer"}
           },
           "additionalProperties": false
         }
 
@@ -346,6 +346,7 @@ type RestartPolicy struct {
 type Placement struct {
 	Constraints []string               `yaml:",omitempty" json:"constraints,omitempty"`
 	Preferences []PlacementPreferences `yaml:",omitempty" json:"preferences,omitempty"`
+	MaxReplicas uint64                 `mapstructure:"max_replicas_per_node" yaml:"max_replicas_per_node,omitempty" json:"max_replicas_per_node,omitempty"`
 }
 
 // PlacementPreferences is the preferences for a service placement
Original file line number	Diff line number	Diff line change
`@@ -424,7 +424,8 @@`
`424`	`424`	`},`
`425`	`425`	`"additionalProperties": false`
`426`	`426`	`}`
`427`		`- }`
	`427`	`+ },`
	`428`	`+ "max_replicas_per_node": {"type": "integer"}`
`428`	`429`	`},`
`429`	`430`	`"additionalProperties": false`
`430`	`431`	`}`
Original file line number	Diff line number	Diff line change
`@@ -346,6 +346,7 @@ type RestartPolicy struct {`
`346`	`346`	`type Placement struct {`
`347`	`347`	Constraints []string `yaml:",omitempty" json:"constraints,omitempty"`
`348`	`348`	Preferences []PlacementPreferences `yaml:",omitempty" json:"preferences,omitempty"`
	`349`	+ MaxReplicas uint64 `mapstructure:"max_replicas_per_node" yaml:"max_replicas_per_node,omitempty" json:"max_replicas_per_node,omitempty"`
`349`	`350`	`}`
`350`	`351`
`351`	`352`	`// PlacementPreferences is the preferences for a service placement`