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.go

@@ -72,6 +72,7 @@ func paramNames() []GeneratorParam {
 		{"target-port", false},
 		{"port-name", false},
 		{"session-affinity", false},
+		{"cluster-ip", false},
 	}
 }
 
@@ -225,5 +226,12 @@ func generate(genericParams map[string]interface{}) (runtime.Object, error) {
 			return nil, fmt.Errorf("unknown session affinity: %s", params["session-affinity"])
 		}
 	}
+	if len(params["cluster-ip"]) != 0 {
+		if params["cluster-ip"] == "None" {
+			service.Spec.ClusterIP = api.ClusterIPNone
+		} else {
+			service.Spec.ClusterIP = params["cluster-ip"]
+		}
+	}
 	return &service, nil
 }