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kubeadm upgrade reads ClusterConfiguration only from the kubeadm-config ConfigMap, so it keeps the old etcd version. The etcd version then changes on all control plane nodes at the same time, and the control plane stops. Upload the ClusterConfiguration first. Then kubeadm upgrades etcd on one node at a time. Signed-off-by: Ali Afsharzadeh <afsharzadeh8@gmail.com>