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Kubernetes (K8s)

Upgrading k8s cluster

Steps to upgrade master node

drain control plane node

plan the upgrade

apply the upgrade

upgrade kubectl and kubelet on control plane node

uncorden the node

Steps to upgrade worker node

drain worker node

upgrade kubeadm

upgrade kubelet config

upgrade kubectl and kubelet

uncorden the 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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