Summary

This chapter covers one of the most common jobs of a Kubernetes administrator – that is, maintaining and upgrading Kubernetes clusters. Similar to cluster installation, this is also one of the most time-consuming tasks in the CKA exam. Again, practice makes perfect. The HA topology for a Kubernetes cluster in Chapter 2, Installing and Configuring Kubernetes Cluster, helps you understand what you are going to upgrade and how to do it. If needed, go back to Chapter 1, Kubernetes Overview, and make sure that you have a good understanding of the Kubernetes components. This way, you will know how and what’s needed to upgrade the control plane and worker nodes.

Compared to cluster upgrades, backup and restore etcd is one of the best-in-value questions in the CKA exam as it is simple to answer with a high-value score. Thoroughly practicing what we’ve learned in this chapter will help you overcome any challenges in the exam.

In the next chapter, we’...