Upgrade All Kubernetes Components on the Control Plane Node

Switch to the appropriate context with kubectl:

kubectl config use-context acgk8s

Upgrade kubeadm:

sudo apt-get update && \
sudo apt-get install -y --allow-change-held-packages kubeadm=1.27.2-1.1

Drain the control plane node:

kubectl drain acgk8s-control --ignore-daemonsets

Plan the upgrade:

sudo kubeadm upgrade plan v1.27.2

Apply the upgrade:

sudo kubeadm upgrade apply v1.27.2

Upgrade kubelet and kubectl:

sudo apt-get update && \
sudo apt-get install -y --allow-change-held-packages kubelet=1.27.2-1.1 kubectl=1.27.2-1.1

Reload:

sudo systemctl daemon-reload

Restart kubelet:

sudo systemctl restart kubelet

Uncordon the control plane node:

kubectl uncordon acgk8s-control

Upgrade All Kubernetes Components on the Worker Nodes

Drain the worker1 node:

kubectl drain acgk8s-worker1 --ignore-daemonsets --force

SSH into the node:

ssh acgk8s-worker1

Install a new version of kubeadm:

sudo apt-get update && \
sudo apt-get install -y --allow-change-held-packages kubeadm=1.27.2-1.1

Upgrade the node:

sudo kubeadm upgrade node

Upgrade kubelet and kubectl:

sudo apt-get update && \
sudo apt-get install -y --allow-change-held-packages kubelet=1.27.2-1.1 kubectl=1.27.2-1.1

Reload:

sudo systemctl daemon-reload

Restart kubelet:

sudo systemctl restart kubelet

Type exit to exit the node.

Uncordon the node:

kubectl uncordon acgk8s-worker1

Repeat the process above for acgk8s-worker2 to upgrade the other worker node.