Cluster Upgrades:
=================

primary master:
---------------

VERSION=1.20.2

apt-get update
apt-get install -y --allow-change-held-packages "kubeadm=$VERSION-00" && apt-mark hold kubeadm
kubeadm version
kubeadm upgrade plan

kubectl drain $(hostname) --ignore-daemonsets --delete-local-data
kubeadm upgrade apply "v$VERSION"

sed "s/^kubernetesVersion: .*$/kubernetesVersion: $VERSION/" -i /etc/kubernetes/kubeadm.config
apt-get update && apt-get install -y --allow-change-held-packages "kubelet=$VERSION-00" "kubectl=$VERSION-00" && apt-mark hold kubelet kubectl

// security updates + reboot ?

kubectl uncordon $(hostname)


secondary master:
-----------------

VERSION=1.20.2

apt-get update
apt-get install -y --allow-change-held-packages "kubeadm=$VERSION-00" && apt-mark hold kubeadm

kubectl drain $(hostname) --ignore-daemonsets --delete-local-data
kubeadm upgrade node
apt-mark unhold kubelet kubectl && apt-get update && apt-get install -y kubelet="$VERSION-00" "kubectl=$VERSION-00" && apt-mark hold kubelet kubectl

// security updates + reboot ?

kubectl uncordon $(hostname)


worker nodes:
-------------

VERSION=1.20.2

apt-get update
apt-get install -y --allow-change-held-packages "kubeadm=$VERSION-00" && apt-mark hold kubeadm

@primary master: kubectl drain <node> --ignore-daemonsets --delete-local-data

kubeadm upgrade node
apt-mark unhold kubelet kubectl && apt-get update && apt-get install -y kubelet="$VERSION-00" "kubectl=$VERSION-00" && apt-mark hold kubelet kubectl

// security updates + reboot ?

@primary master: kubectl uncordon <node>