When running a
kubeadm upgrade plan I am getting:
[preflight] Running pre-flight checks.
[upgrade] Making sure the cluster is healthy:
[upgrade/config] Making sure the configuration is correct:
[upgrade/config] Reading configuration from the cluster...
[upgrade/config] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[upgrade/config] FATAL: unexpected error when reading kubeadm-config ConfigMap: ClusterConfiguration key value pair missing
What is this configmap and how do I get it?