February 5, 2023
Kubeadm is the official tool for installing and maintaining a cluster that’s based on the default Kubernetes distribution. Created clusters don’t automatically upgrade themselves and disabling package updates for Kubernetes components is part of the set up process. This means you have to manually migrate your cluster when a new Kubernetes release arrives. In this…

Kubeadm is the official tool for installing and maintaining a cluster that’s based on the default Kubernetes distribution. Created clusters don’t automatically upgrade themselves and disabling package updates for Kubernetes components is part of the set up process. This means you have to manually migrate your cluster when a new Kubernetes release arrives.

In this article you’ll learn the steps involved in a Kubernetes upgrade by walking through a transition from v1.24 to v1.25 on Ubuntu 22.04. The process is usually similar for any Kubernetes minor release but you should always refer to the official documentation before you start, in case a new release carries specialist requirements.

Identifying the Precise Version to Install

The first step is determining the version you’re going to upgrade to. You can’t skip minor versions – going directly from v1.23 to v1.25 is unsupported, for example – so you should pick the most recent patch release for the minor version that follows your cluster’s current release.

You can discover the latest patch version with the following command:

$ apt-cache policy kubeadm | grep 1.25 1.25.1-00 500 1.25.0-00 500

This…

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