I followed the steps at 
https://coreos.com/kubernetes/docs/1.6.1/getting-started.html to install 
Kubernetes on CoreOS machines.

When I get the pods, looks like everything is working fine.

./kubectl get pods --namespace=kube-system

NAME                                     READY     STATUS              RESTARTS 
  AGE
calico-node-12g51                        2/2       Running             4        
  1h
calico-node-dtzss                        2/2       Running             6        
  1h
calico-node-p35sl                        2/2       Running             4        
  1h
calico-policy-controller-kh7lz           1/1       Running             2        
  1h
kube-apiserver-10.201.101.234            1/1       Running             3        
  2h
kube-controller-manager-10.201.101.234   1/1       Running             3        
  2h
kube-proxy-10.201.101.234                1/1       Running             3        
  2h
kube-proxy-10.201.101.236                1/1       Running             7        
  2d
kube-proxy-10.201.101.237                1/1       Running             5        
  1d
kube-scheduler-10.201.101.234            1/1       Running             3        
  2h
Then, I follow the steps at 
https://coreos.com/kubernetes/docs/1.6.1/deploy-addons.html to deploy DNS 
add-on.

After that step, I see the kube-dns pod stays at ContainerCreating status 
forever.

kube-dns-v20-htqvx    0/3       ContainerCreating   0          16m
./kubectl describe pod kube-dns-v20-htqvx --namespace=kube-system gives the 
below log.

 FirstSeen     LastSeen        Count   From                    SubObjectPath   
Type            Reason          Message
  ---------     --------        -----   ----                    -------------   
--------        ------          -------
  16m           16m             1       default-scheduler                       
Normal          Scheduled       Successfully assigned kube-dns-v20-htqvx to 
10.201.101.237
  15m           15m             1       kubelet, 10.201.101.237                 
Warning         FailedSync      Error syncing pod, skipping: failed to 
"CreatePodSandbox" for 
"kube-dns-v20-htqvx_kube-system(e3f84b85-990d-11e7-9392-005056a16f20)" with 
CreatePodSandboxError: "CreatePodSandbox for pod 
\"kube-dns-v20-htqvx_kube-system(e3f84b85-990d-11e7-9392-005056a16f20)\" 
failed: rpc error: code = 2 desc = NetworkPlugin cni failed to set up pod 
\"kube-dns-v20-htqvx_kube-system\" network: Get 
https://10.3.0.1:443/api/v1/namespaces/kube-system/pods/kube-dns-v20-htqvx: 
dial tcp 10.3.0.1:443: i/o timeout"
I see the dial tcp 10.3.0.1:443: i/o timeout error

I assume something is wrong at my installation. Can you please help?

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