Hi Team,
What is the client and server version in the cluster installation and whats the key role of that two and how er can update the both please explain the hierarchy .
the API server version is v1.18. to be able to communicate with this server, you can use python/java/…etc script or use the kubectl. if the client"kubectl" is lower than the server, maybe some options not available to the kubectl. to upgrade the kubectl, you should download the binary and replace it with the current one Install Tools | Kubernetes and to upgrade the cluster components check this Upgrading kubeadm clusters | Kubernetes