find the latest 1.15 version in the list

it should look like 1.15.x-0, where x is the latest patch

replace x in 1.15.x-0 with the latest patch version

yum install -y kubeadm-1.15.x-0 --disableexcludes=kubernetes
kubeadm version
sudo kubeadm upgrade plan
sudo kubeadm upgrade apply v1.15.x

replace x in 1.15.x-0 with the latest patch version

yum install -y kubelet-1.15.x-0 kubectl-1.15.x-0 --disableexcludes=kubernetes
sudo systemctl restart kubelet

Upgrade additional control plane nodes
sudo kubeadm upgrade node
sudo kubeadm upgrade apply

replace x in 1.15.x-0 with the latest patch version

yum install -y kubeadm-1.15.x-0 --disableexcludes=kubernetes
kubectl drain $NODE --ignore-daemonsets
sudo kubeadm upgrade node

replace x in 1.15.x-0 with the latest patch version

yum install -y kubelet-1.15.x-0 kubectl-1.15.x-0 --disableexcludes=kubernetes
sudo systemctl restart kubelet

k8s升级v1.14 to v1.15

原文：https://blog.51cto.com/xudate/2412825