title: Kubernetes cluster setup fails
body: <p>I did kubernetes cluster set up by following these  <a href="https://jhooq.com/14-steps-to-install-kubernetes-on-ubuntu-18-04-and-16-04/" rel="nofollow noreferrer">steps</a></p>
  <p>Getting below error</p>
  <pre><code>error execution phase preflight: couldn't validate the identity of the API Server: Get https://master_ip:6443/api/v1/namespaces/kube-public/configmaps/cluster-info?timeout=10s: context deadline exceeded (Client.Timeout exceeded while awaiting headers)
  
  
  
  
  join.go:441] [preflight] Discovering cluster-info
  I0708 11:21:00.558484   26181 token.go:188] [discovery] Trying to connect to API Server &quot;ip_address:6443&quot;
  I0708 11:21:00.559011   26181 token.go:73] [discovery] Created cluster-info discovery client, requesting info from &quot;https://ipaddress:6443&quot;
  I0708 11:21:00.559138   26181 round_trippers.go:423] curl -k -v -XGET  -H &quot;Accept: application/json, */*&quot; -H &quot;User-Agent: kubeadm/v1.17.8 (linux/amd64) kubernetes/35dc4cd&quot; 'https://ip_address:6443/api/v1/namespaces/kube-public/configmaps/cluster-info?timeout=10s'
  I0708 11:21:10.559339   26181 round_trippers.go:443] GET https://ip_address:6443/api/v1/namespaces/kube-public/configmaps/cluster-info?timeout=10s  in 10000 milliseconds
  I0708 11:21:10.559376   26181 round_trippers.go:449] Response Headers:
  I0708 11:21:10.559439   26181 token.go:78] [discovery] Failed to request cluster info: [Get https://ip_address:6443/api/v1/namespaces/kube-public/configmaps/cluster-info?timeout=10s: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)]
  I0708 11:21:10.559455   26181 token.go:191] [discovery] Failed to connect to API Server &quot;ip_address:6443&quot;: Get https://ip_address:6443/api/v1/namespaces/kube-public/configmaps/cluster-info?timeout=10s: net/http: request canceled while waiting for connection (Client.Timeout exceeded while awaiting headers)
  I0708 11:21:15.559694   26181 token.go:188] [discovery] Trying to connect to API Server &quot;ip_address:6443&quot;
  I0708 11:21:15.560266   26181 token.go:73] [discovery] Created cluster-info discovery client, requesting info from &quot;https://ip_address:6443&quot;
  I0708 11:21:15.560381   26181 round_trippers.go:423] curl -k -v -XGET  -H &quot;Accept: application/json, */*&quot; -H &quot;User-Agent: kubeadm/v1.17.8 (linux/amd64) kubernetes/35dc4cd&quot; 'https://ip_address:6443/api/v1/namespaces/kube-public/configmaps/cluster-info?timeout=10s'
  I0708 11:21:25.560573   26181 round_trippers.go:443] GET https://ip_address:6443/api/v1/namespaces/kube-public/configmaps/cluster-info?timeout=10s  in 10000 milliseconds
  </code></pre>