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Upgrade k8s Cluster

To Find the latest patch release for Kubernetes 1.31(or 1.32 or .....) using the OS package manager:

sudo apt update
sudo apt-cache madison kubeadm

Results:
kubeadm | 1.31.5-1.1 | https://pkgs.k8s.io/core:/stable:/v1.31/deb  Packages
kubeadm | 1.31.4-1.1 | https://pkgs.k8s.io/core:/stable:/v1.31/deb  Packages
kubeadm | 1.31.3-1.1 | https://pkgs.k8s.io/core:/stable:/v1.31/deb  Packages
kubeadm | 1.31.2-1.1 | https://pkgs.k8s.io/core:/stable:/v1.31/deb  Packages
kubeadm | 1.31.1-1.1 | https://pkgs.k8s.io/core:/stable:/v1.31/deb  Packages
kubeadm | 1.31.0-1.1 | https://pkgs.k8s.io/core:/stable:/v1.31/deb  Packages

  • Start with the ControlPlane Nodes:

    • Drain Node: k drain controlplane --ignore-daemonsets
    • Change packege repository version:

      • List first:

        • pager /etc/apt/sources.list.d/kubernetes.list

      • nano /etc/apt/sources.list.d/kubernetes.list

        • deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.31/deb/ /

      • Ob.: if you only wanna update it, just change the version, ex. v1.31 on the link above.

      • Run again:

        sudo apt update
sudo apt-cache madison kubeadm

      • Copy the latest version

      • # replace x in 1.31.x-* with the latest patch version
sudo apt-mark unhold kubeadm && \
sudo apt-get update && sudo apt-get install -y kubeadm='1.31.x-*' && \
sudo apt-mark hold kubeadm

      • Check the version

        • kubeadm version

      • Verify the upgrade plan:

        • sudo kubeadm upgrade plan

      • If it is all good, just run:

        • kubeadm upgrade apply v1.31.x

      • Upgrading Kubelet and Kubectl:

        sudo apt-mark unhold kubelet kubectl && \
sudo apt-get update && sudo apt-get install -y kubelet='1.31.0-1.1' kubectl='1.31.0-1.1' && \
sudo apt-mark hold kubelet kubectl

      • Restart Kubelet:

        sudo systemctl daemon-reload
sudo systemctl restart kubelet

      • Confirm that the version is upgraded:

        • k get nodes

      • Now uncordo the Node:

        • kubectl uncordon controlplane

  • Worker Nodes:

    • ssh root@node01
    • Upgrade kubeadm 
      sudo apt-mark unhold kubeadm && \
sudo apt-get update && sudo apt-get install -y kubeadm='1.31.0-1.1' && \
sudo apt-mark hold kubeadm
    • Upgrade kubeadm: sudo kubeadm upgrade node
    • Drain the WorkerNode: kubectl drain <node-to-drain> --ignore-daemonsets
    • Upgrading Kubelet and Kubectl: 
      sudo apt-mark unhold kubelet kubectl && \
sudo apt-get update && sudo apt-get install -y kubelet='1.31.0-1.1' kubectl='1.31.0-1.1' && \
sudo apt-mark hold kubelet kubectl
    • Restart Kubelet: 
      sudo systemctl daemon-reload
sudo systemctl restart kubelet
    • Confirm that the version is upgraded: k get nodes
    • Now uncordo the Node: kubectl uncordon node01

Docs: