[Query] How to upgrade EKS stack from k8s version 1.18 to 1.19?

[amitkatyal]

I deployed the EKS stack (k8s version 1.18) using the aws quick start guide. However, after upgrading the control plane nested stack with the k8s version from 1.18 to 1.19, the control plane got upgraded to version 1.19, but it seems the communication between the control plane & data plane got impacted.

I could fetch the status of the k8s object, for example, "kubectl get pods, cm..etc" but kubectl get logs was returning authorization error.

Error logs: Error from server (InternalError): Internal error occurred: Authorization error (user=kube-apiserver-kubelet-client, verb=get, resource=nodes, subresource=proxy)

Also, the control plane upgrade did not restart the k8s pods (Kube-proxy, core-DNS)

Do we need to update any other stacks to upgrade to the new k8s version?