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

primary control-plane node:
---------------------------

VERSION=1.24.3


apt-get update
sed "s/^Pin: version .*$/Pin: version $VERSION-*/" -i /etc/apt/preferences.d/kubeadm.pref
apt-get install -y "kubeadm=$VERSION-*"
kubeadm version
kubeadm upgrade plan

kubectl drain $(hostname) --ignore-daemonsets --delete-emptydir-data
kubeadm upgrade apply "v$VERSION"
sed "s/^kubernetesVersion: .*$/kubernetesVersion: $VERSION/" -i /etc/kubernetes/kubeadm.config

sed "s/^Pin: version .*$/Pin: version $VERSION-*/" -i /etc/apt/preferences.d/kubelet.pref
sed "s/^Pin: version .*$/Pin: version $VERSION-*/" -i /etc/apt/preferences.d/kubectl.pref
apt-get update && apt-get install -y "kubelet=$VERSION-*" "kubectl=$VERSION-*"

// security updates + reboot ?

kubectl uncordon $(hostname)


secondary control-plane node:
-----------------------------

VERSION=1.24.3

apt-get update
sed "s/^Pin: version .*$/Pin: version $VERSION-*/" -i /etc/apt/preferences.d/kubeadm.pref
apt-get install -y "kubeadm=$VERSION-*"

kubectl drain $(hostname) --ignore-daemonsets --delete-emptydir-data
kubeadm upgrade node
sed "s/^Pin: version .*$/Pin: version $VERSION-*/" -i /etc/apt/preferences.d/kubelet.pref
sed "s/^Pin: version .*$/Pin: version $VERSION-*/" -i /etc/apt/preferences.d/kubectl.pref
apt-get update && apt-get install -y kubelet="$VERSION-*" "kubectl=$VERSION-*"

// security updates + reboot ?

kubectl uncordon $(hostname)


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

VERSION=1.24.3

apt-get update
sed "s/^Pin: version .*$/Pin: version $VERSION-*/" -i /etc/apt/preferences.d/kubeadm.pref
apt-get install -y "kubeadm=$VERSION-*"

@primary control-plane node: kubectl drain <node> --ignore-daemonsets --delete-emptydir-data

kubeadm upgrade node
sed "s/^Pin: version .*$/Pin: version $VERSION-*/" -i /etc/apt/preferences.d/kubelet.pref
sed "s/^Pin: version .*$/Pin: version $VERSION-*/" -i /etc/apt/preferences.d/kubectl.pref
apt-get update && apt-get install -y kubelet="$VERSION-*" "kubectl=$VERSION-*"

// security updates + reboot ?

@primary control-plane node: kubectl uncordon <node>