Book Image

Cloud Native with Kubernetes

By : Alexander Raul
Book Image

Cloud Native with Kubernetes

By: Alexander Raul

Overview of this book

Kubernetes is a modern cloud native container orchestration tool and one of the most popular open source projects worldwide. In addition to the technology being powerful and highly flexible, Kubernetes engineers are in high demand across the industry. This book is a comprehensive guide to deploying, securing, and operating modern cloud native applications on Kubernetes. From the fundamentals to Kubernetes best practices, the book covers essential aspects of configuring applications. You’ll even explore real-world techniques for running clusters in production, tips for setting up observability for cluster resources, and valuable troubleshooting techniques. Finally, you’ll learn how to extend and customize Kubernetes, as well as gaining tips for deploying service meshes, serverless tooling, and more on your cluster. By the end of this Kubernetes book, you’ll be equipped with the tools you need to confidently run and extend modern applications on Kubernetes.
Table of Contents (22 chapters)
1
Section 1: Setting Up Kubernetes
5
Section 2: Configuring and Deploying Applications on Kubernetes
11
Section 3: Running Kubernetes in Production
16
Section 4: Extending Kubernetes

Chapter 10 – Troubleshooting Kubernetes

  1. One of the strengths of Kubernetes is the ability to scale the cluster easily by adding nodes or changing Pod placement by using controls such as taints and tolerations. In addition, Pod restarts can result in completely different IPs for the same application. This means that both the compute and network topologies can be ever-changing.
  2. The kubelet is typically run as a Linux service with systemd, with control available using systemctl and logs in journalctl.
  3. There are a few different methodologies to use, but generally, you would want to check whether all Nodes are ready and schedulable; whether there are any Pod Placement Controls precluding scheduling of the Pod; and whether there is any dependent storage, ConfigMaps, or secrets that do not exist.