// It also returns the hostname or an error if getting the hostname failed.
func GetNodeNameAndHostname(cfg *kubeadmapi.NodeRegistrationOptions) (string, string, error) {
	hostname, err := nodeutil.GetHostname("")
	nodeName := hostname
	if cfg.Name != "" {
		nodeName = cfg.Name
	}
	if name, idx := kubeadmapi.GetArgValue(cfg.KubeletExtraArgs, "hostname-override", -1); idx > -1 {
		nodeName = name
	}

    .build();

// Create a server certificate and a server that uses it.
HeldCertificate serverCertificate = new HeldCertificate.Builder()
    .commonName("ingen")
    .addSubjectAlternativeName(server.getHostName())
    .signedBy(rootCertificate)
    .build();
HandshakeCertificates serverCertificates = new HandshakeCertificates.Builder()
    .addTrustedCertificate(rootCertificate.certificate())