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Kubernetes (K8s)
Upgrading k8s cluster
Steps to upgrade master node
Steps to upgrade worker node
***************** Upgrade Control Plane Node ******************
1. Get the Running Node and Version
kubectl get nodes
2. Drain Master Node
kubectl drain <master_node_name-to-drain> --ignore-daemonsets
3. Upgrade kubeadm
sudo apt-get update
sudo apt-get install -y --allow-change-held-packages kubeadm=1.21.1-00
4. Verify that the download works and has the expected version:
kubeadm version
5. Verify the upgrade plan
sudo kubeadm upgrade plan v1.21.1-00
6. Apply the Upgrade
sudo kubeadm upgrade apply v1.21.1
7. Upgrade kubelet and kubectl packages
sudo apt-get update
sudo apt-get install -y --allow-change-held-packages kubelet=1.21.1-00 kubectl=1.21.1-00
8. Restart the kubelet:
sudo systemctl daemon-reload
sudo systemctl restart kubelet
10. Get the Running Node and Version
kubectl get nodes
11. Uncordon the Node
kubectl uncordon <master_node_name-to-uncordon>
***************** Upgrade Worker Node ******************
1. Drain Worker Node
kubectl drain <worker_node-to-drain> --ignore-daemonsets --force
2. Upgrade kubeadm
sudo apt-get update
sudo apt-get install -y --allow-change-held-packages kubeadm=1.21.1-00
3. Verify that the download works and has the expected version:
kubeadm version
4. For worker nodes this upgrades the local kubelet configuration
sudo kubeadm upgrade node
5. Upgrade kubelet and kubectl packages
sudo apt-get update
sudo apt-get install -y --allow-change-held-packages kubelet=1.21.1-00 kubectl=1.21.1-00
6. Restart the kubelet:
sudo systemctl daemon-reload
sudo systemctl restart kubelet
7. Get the Running Node and Version
kubectl get nodes
8. Uncordon the Node
kubectl uncordon <node-to-uncordon>
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