allErrs = append(allErrs, ValidateCertSANs(e.Local.ServerCertSANs, localPath.Child("serverCertSANs"))...)
		allErrs = append(allErrs, ValidateCertSANs(e.Local.PeerCertSANs, localPath.Child("peerCertSANs"))...)
		if len(e.Local.ImageRepository) > 0 {
			allErrs = append(allErrs, ValidateImageRepository(e.Local.ImageRepository, localPath.Child("imageRepository"))...)
		}

		LocalAPIEndpoint: kubeadmapi.APIEndpoint{AdvertiseAddress: advertiseIP},
		ClusterConfiguration: kubeadmapi.ClusterConfiguration{
			Etcd: kubeadmapi.Etcd{
				Local: &kubeadmapi.LocalEtcd{
					PeerCertSANs: []string{
						proxy,
						proxyIP,
						"1.2.3.L",
						"invalid,commas,in,DNS",
					},
				},
			},
		},
		NodeRegistration: kubeadmapi.NodeRegistrationOptions{Name: hostname},
	}