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Becoming KCNA Certified

Becoming KCNA Certified

By : Dmitry Galkin
5 (6)
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Becoming KCNA Certified

Becoming KCNA Certified

5 (6)
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)
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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

Container runtimes

As you know from the previous chapters, containers can run on virtual machines, in the cloud, on-premise, on bare-metal servers, or simply on your laptop. The software responsible for basic operations such as downloading images from the registry and creating, starting, stopping, or deleting containers is called the container runtime. We’ve already learned about Docker tooling and runtime, but there are more runtimes that exist, including the following:

  • Containerd
  • CRI-O
  • kata
  • gVisor

Before going into runtime specifics, we need to understand what a Container Runtime Interface (CRI) is.

CRI

The CRI is a plugin interface that allows Kubernetes to use different container runtimes. In the first releases of Kubernetes before the CRI was introduced, it was only possible to use Docker as a runtime.

As you might remember, Kubernetes does not have its own runtime to do basic container operations, so it needs a runtime to manage containers...

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