Allow override of "kubernetes" endpoint port

staging/src/k8s.io/apiserver/pkg/server/config.go

@@ -206,6 +206,8 @@ type SecureServingInfo struct {
 	// HTTP2MaxStreamsPerConnection is the limit that the api server imposes on each client.
 	// A value of zero means to use the default provided by golang's HTTP/2 support.
 	HTTP2MaxStreamsPerConnection int
+
+	AdvertisePort int
 }
 
 type AuthenticationInfo struct {
@@ -474,6 +476,9 @@ func (s *SecureServingInfo) HostPort() (string, int, error) {
 	if err != nil {
 		return "", 0, fmt.Errorf("invalid non-numeric port %q", portStr)
 	}
+	if s.AdvertisePort != 0 {
+		port = s.AdvertisePort
+	}
 	return host, port, nil
 }
 

staging/src/k8s.io/apiserver/pkg/server/options/serving.go

@@ -65,6 +65,8 @@ type SecureServingOptions struct {
 	// HTTP2MaxStreamsPerConnection is the limit that the api server imposes on each client.
 	// A value of zero means to use the default provided by golang's HTTP/2 support.
 	HTTP2MaxStreamsPerConnection int
+
+	AdvertisePort int
 }
 
 type CertKey struct {
@@ -252,6 +254,8 @@ func (s *SecureServingOptions) ApplyTo(config **server.SecureServingInfo) error
 		return err
 	}
 
+	c.AdvertisePort = s.AdvertisePort
+
 	return nil
 }