opts.peerPort = 2381
		} else {
			opts.peerPort = 2380
		}
		klog.Infof("--peer-port unset - defaulting to %d", opts.peerPort)
	}

	if opts.initialCluster == "" {
		def := fmt.Sprintf(initialClusterFmt, opts.name, opts.peerPort)
		opts.initialCluster = fallbackToEnvWithDefault("initial-cluster", initialClusterEnv, def)
	}

	if opts.peerListenUrls == "" {
		def := fmt.Sprintf(peerListenUrlsFmt, opts.peerPort)

	}

	if len(initialCluster) == 0 {
		defaultArguments = kubeadmapi.SetArgValues(defaultArguments, "initial-cluster", fmt.Sprintf("%s=%s", nodeName, etcdutil.GetPeerURL(endpoint)), 1)
	} else {
		// NB. the joining etcd member should be part of the initialCluster list
		endpoints := []string{}
		for _, member := range initialCluster {

			advertiseAddress: "1.2.3.4",
			nodeName:         "foo",
			initialCluster: []etcdutil.Member{
				{Name: "foo", PeerURL: fmt.Sprintf("https://1.2.3.4:%d", kubeadmconstants.EtcdListenPeerPort)}, // NB. the joining etcd instance should be part of the initialCluster list
				{Name: "bar", PeerURL: fmt.Sprintf("https://5.6.7.8:%d", kubeadmconstants.EtcdListenPeerPort)},
			},

      },
      {
        "name": "DO_NOT_MOVE_BINARIES",
        "value": "true"
      },
      { "name": "DATA_DIRECTORY",
        "value": "/var/etcd/data{{ suffix }}"
      },
      { "name": "INITIAL_CLUSTER",
        "value": "{{ etcd_cluster }}"
      },
      { "name": "LISTEN_PEER_URLS",
        "value": "{{ etcd_protocol }}://{{ host_ip }}:{{ server_port }}"
      },
      { "name": "INITIAL_ADVERTISE_PEER_URLS",