Merge pull request #28239 from ApsOps/kubectl-expose-headless-svc

Automatic merge from submit-queue

Add a flag for `kubectl expose`to set ClusterIP and allow headless services

- Use `--cluster-ip=None` to create a headless service
- Fixes #10294

pkg/kubectl/service_test.go

@@ -303,6 +303,66 @@ func TestGenerateService(t *testing.T) {
 				},
 			},
 		},
+		{
+			generator: ServiceGeneratorV2{},
+			params: map[string]interface{}{
+				"selector":       "foo=bar,baz=blah",
+				"name":           "test",
+				"port":           "80",
+				"protocol":       "TCP",
+				"container-port": "1234",
+				"cluster-ip":     "10.10.10.10",
+			},
+			expected: api.Service{
+				ObjectMeta: api.ObjectMeta{
+					Name: "test",
+				},
+				Spec: api.ServiceSpec{
+					Selector: map[string]string{
+						"foo": "bar",
+						"baz": "blah",
+					},
+					Ports: []api.ServicePort{
+						{
+							Port:       80,
+							Protocol:   "TCP",
+							TargetPort: intstr.FromInt(1234),
+						},
+					},
+					ClusterIP: "10.10.10.10",
+				},
+			},
+		},
+		{
+			generator: ServiceGeneratorV2{},
+			params: map[string]interface{}{
+				"selector":       "foo=bar,baz=blah",
+				"name":           "test",
+				"port":           "80",
+				"protocol":       "TCP",
+				"container-port": "1234",
+				"cluster-ip":     "None",
+			},
+			expected: api.Service{
+				ObjectMeta: api.ObjectMeta{
+					Name: "test",
+				},
+				Spec: api.ServiceSpec{
+					Selector: map[string]string{
+						"foo": "bar",
+						"baz": "blah",
+					},
+					Ports: []api.ServicePort{
+						{
+							Port:       80,
+							Protocol:   "TCP",
+							TargetPort: intstr.FromInt(1234),
+						},
+					},
+					ClusterIP: api.ClusterIPNone,
+				},
+			},
+		},
 		{
 			generator: ServiceGeneratorV1{},
 			params: map[string]interface{}{