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

From [kubernetes][1] official site:

1. Verify that the $HOME/.kube/config file contains a valid certificate, and regenerate a certificate

2. Unset the KUBECONFIG environment variable using:

   unset KUBECONFIG

   Or set it to the default KUBECONFIG location:

   export KUBECONFIG=/etc/kubernetes/admin.conf

3. Another workaround is to overwrite the existing kubeconfig for the “admin” user:

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


**Reference:** [official site link reference][2]

[1]: https://kubernetes.io/
[2]: https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/troubleshooting-kubeadm/