x509 certificate signed by unknown authority- Kubernetes

Question

I am configuring Kubernetes cluster with 2 nodes in coreos as described in https://coreos.com/kubernetes/docs/latest/getting-started.html without flannel. Both

Answer 1

mkdir -p $HOME/.kube   
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config   
sudo chown $(id -u):$(id -g) $HOME/.kube/config