As this is the biggest topic (30%) on the CKA exam, we’re going to cover troubleshooting in detail in this chapter. Troubleshooting means fixing problems with applications, control plane components, worker nodes, and the underlying network. When running applications in Kubernetes, problems will arise, such as concerns with Pods, Services, and Deployments.
This chapter covers the troubleshooting domain of the CKA curriculum, which consists of 30% of the questions on the exam. This domain covers the techniques we use to discover and fix problems inside our Kubernetes cluster, including viewing the logs, capturing cluster events, networking problems, and application monitoring. It encompasses the following competencies.
This chapter will help you understand the logs that a container might output in the process of debugging and getting the application back to a healthy state. If the problem is not the application, it may be the underlying node, the underlying operating system, or a communication problem on the network. On the exam, you’ll be expected to know the differences between an application failure, a cluster-level problem, and a network problem and how to troubleshoot and determine a resolution in the shortest amount of time.