flanneld restarts multiple times at CoreOS boot time about vagrant-coreos HOT 4 OPEN

core@c1 ~ $ systemctl status flanneld.service
● flanneld.service - Network fabric for containers
   Loaded: loaded (/usr/lib64/systemd/system/flanneld.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/flanneld.service.d
           └─40-ExecStartPre-symlink.conf.conf
   Active: active (running) since Fri 2016-06-03 23:48:35 UTC; 6min ago

core@c1 ~ $ systemctl status coreos-cloudinit-120749834.service
● coreos-cloudinit-120749834.service - Unit generated and executed by coreos-cloudinit on behalf of user
   Loaded: loaded (/run/systemd/system/coreos-cloudinit-120749834.service; static; vendor preset: disabled)
  Drop-In: /run/systemd/system/coreos-cloudinit-120749834.service.d
           └─50-Description.conf, 50-ExecStart.conf
   Active: failed (Result: exit-code) since Fri 2016-06-03 23:37:40 UTC; 20min ago
 Main PID: 1172 (code=exited, status=1/FAILURE)

MacBook-Pro:/Users/yiwang/work/coreos-kubernetes/multi-node/vagrant (master)
$ ./kubectl get nodes
The connection to the server 172.17.4.101:443 was refused - did you specify the right host or port?

core@c1 ~ $ systemctl list-unit-files | grep kube
kubelet.service                                                         disabled

core@c1 ~ $ sudo systemctl restart coreos-cloudinit-120749834.service

core@c1 ~ $ systemctl status kubelet.service
● kubelet.service
   Loaded: loaded (/etc/systemd/system/kubelet.service; enabled; vendor preset: disabled)
   Active: active (running) since Sat 2016-06-04 00:48:56 UTC; 1min 35s ago
  Process: 2156 ExecStartPre=/usr/bin/mkdir -p /etc/kubernetes/manifests (code=exited, status=0/SUCCESS)

core@w1 ~ $ systemctl list-units | grep kube
  kubelet.service                                                                          loaded active running   kubelet.service
core@w1 ~ $ systemctl status kubelet.service
● kubelet.service
   Loaded: loaded (/etc/systemd/system/kubelet.service; enabled; vendor preset: disabled)
   Active: active (running) since Sat 2016-06-04 00:53:25 UTC; 2min 44s ago

$ kubectl get nodes
The connection to the server 172.17.4.101:443 was refused - did you specify the right host or port?