Book Image

Becoming KCNA Certified

By : Dmitry Galkin
Book Image

Becoming KCNA Certified

By: Dmitry Galkin

Overview of this book

The job market related to the cloud and cloud-native technologies is both growing and becoming increasingly competitive, making certifications like KCNA a great way to stand out from the crowd and learn about the latest advancements in cloud technologies. Becoming KCNA Certified doesn't just give you the practical skills needed to deploy and connect applications in Kubernetes, but it also prepares you to pass the Kubernetes and Cloud Native Associate (KCNA) exam on your first attempt. The book starts by introducing you to cloud-native computing, containers, and Kubernetes through practical examples, allowing you to test the theory out for yourself. You'll learn how to configure and provide storage for your Kubernetes-managed applications and explore the principles of modern cloud-native architecture and application delivery, giving you a well-rounded view of the subject. Once you've been through the theoretical and practical aspects of the book, you'll get the chance to test what you’ve learnt with two mock exams, with explanations of the answers, so you'll be well-prepared to appear for the KCNA exam. By the end of this Kubernetes book, you'll have everything you need to pass the KCNA exam and forge a career in Kubernetes and cloud-native computing.
Table of Contents (22 chapters)
1
Part 1: The Cloud Era
4
Part 2: Performing Container Orchestration
7
Part 3: Learning Kubernetes Fundamentals
12
Part 4: Exploring Cloud Native
16
Part 5: KCNA Exam and Next Steps

Kubernetes networking essentials

Without exaggeration, K8s networking is probably the hardest part to understand, and even for very experienced engineers and operators, it might be tough. As you hopefully remember from Chapter 4, Kubernetes implements the Container Networking Interface (CNI), which allows us to use different overlay network plugins for container networking. Yet there are so many CNI providers out there (Flannel, Calico, Cilium, Weave, and Canal, to name a few) that it is easy to get confused. Those providers rely on different technologies such as Border Gateway Protocol (BGP) or Virtual Extensible LAN (VXLAN) to deliver different levels of overlay network performance and offer different features.

But don’t worry – for the scope of KCNA, you are not required to know many details. For now, we will cover Kubernetes networking essentials.

Have a look at the following diagram:

Figure 8.1 – Kubernetes networking model

Figure 8.1 – Kubernetes networking model...