kubernetes: Kubelet won't read apiserver from kubeconfig

Is this a request for help? (If yes, you should use our troubleshooting guide and community support channels, see http://kubernetes.io/docs/troubleshooting/.): No

What keywords did you search in Kubernetes issues before filing this one? kubelet kubeconfig

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Is this a BUG REPORT or FEATURE REQUEST? (choose one): Bug report

Kubernetes version (use kubectl version): Client Version: version.Info{Major:“1”, Minor:“4”, GitVersion:“v1.4.3+coreos.0”, GitCommit:“7819c84f25e8c661321ee80d6b9fa5f4ff06676f”, GitTreeState:“clean”, BuildDate:“2016-10-17T21:19:17Z”, GoVersion:“go1.6.3”, Compiler:“gc”, Platform:“linux/amd64”} Server Version: version.Info{Major:“1”, Minor:“4”, GitVersion:“v1.4.3+coreos.0”, GitCommit:“7819c84f25e8c661321ee80d6b9fa5f4ff06676f”, GitTreeState:“clean”, BuildDate:“2016-10-17T21:19:17Z”, GoVersion:“go1.6.3”, Compiler:“gc”, Platform:“linux/amd64”}

Environment:

• Cloud provider or hardware configuration:

• OS (e.g. from /etc/os-release): Ubuntu Xenial 16.04

• Kernel (e.g. uname -a): Linux node1 4.4.0-36-generic #55-Ubuntu SMP Thu Aug 11 18:01:55 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

• Install tools: Kargo (Ansible-based)

• Others:

What happened: –api-servers option is deprecated for kubelet, so I am now trying to deploy with simply using --kubeconfig=/etc/kubernetes/node-kubeconfig.yaml

The error in kubelet log is: W1114 12:00:28.684692 31989 server.go:383] No API client: no api servers specified

What you expected to happen: Kubelet should start and register itself to my kube apiserver

How to reproduce it (as minimally and precisely as possible): Execution call: hyperkube kubelet --v=2 --address=10.90.0.2 --hostname-override=node1 --allow-privileged=true --cluster_dns=10.233.0.2 --cluster_domain=cluster.local --kubeconfig=/etc/kubernetes/node-kubeconfig.yaml --pod-manifest-path=/etc/kubernetes/manifests --resolv-conf=/etc/resolv.conf --pod-infra-container-image=gcr.io/google_containers/pause-amd64:3.0 --network-plugin=cni --network-plugin-dir=/etc/cni/net.d

kubeconfig:

kind: Config
clusters:
- name: local
  cluster:
    certificate-authority: /etc/kubernetes/ssl/ca.pem
    server: https://node1:443
users:
- name: kubelet
  user:
    client-certificate: /etc/kubernetes/ssl/node.pem
    client-key: /etc/kubernetes/ssl/node-key.pem
contexts:
- context:
    cluster: local
    user: kubelet
  name: kubelet-cluster.local
current-context: kubelet-cluster.local

Anything else do we need to know: Kubelet works fine with --api-servers specified, but not when reading the server field in kubeconfig. The results are the same when trying to connect to http or https-based apiserver.