title: “Cluster Hardening – Upgrade Kubernetes”
date: 2020-12-10T21:54:21
slug: cluster-hardening-upgrade-kubernetes

kubectl drain
Do the upgrade
kubectl uncordon

Upgrade the Cluster to one minor Version up

Masternode:

k drain xxxxx --ignore-daemonsets
apt-cache show kubeadm | grep 1.19 (next Version)
apt install kubeadm=xxxxx kubelet=xxxx kubectl=xxxxx
kubeadm upgrade plan
kubeadm upgrade apply 1.19.3 (suggested command)
k uncordon xxxx

Workernode:

k drain xxxxx --ignore-daemonsets
apt-cache show kubeadm | grep 1.19
apt install kubeadm=xxxxx kubelet=xxxx kubectl=xxxxx
systemctl restart kubelet
k uncordon xxxx