Upgrading kubeadm clusters from v1.14 to v1.15
yum list --showduplicates kubeadm --disableexcludes=kubernetes
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