I have a 2 master kubernetes cluster setup which is running on 1.17.4 version. When I am upgrading the cluster to 1.18.0, kube-apiserver pod on one of the master node is running fine, but it goes into crashloopbackoff state on the other master node.
Pod log says that:-
I think we have an option to upgrade 1-master node with out effecting the other. Please refer the k8s Doc