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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 security

Container security is an advanced and complex topic and yet even for an entry-level KCNA certification, you are expected to know a few basics. As we’ve learned, Namespaced containers are the most commonly used containers and they share the kernel of an underlying OS. That means a process running in a container cannot see other processes running in other containers or processes running on the host. However, all processes running on one host still use the same kernel. If one of the containers gets compromised, there is a chance of the host and all other containers being compromised as well.

Let’s get back to our Docker setup for a quick demonstration. Start an Ubuntu container as we did before and run the uname -r command to see which kernel version is used:

$ docker run -it ubuntu:22.04 bash
root@4a3db7a03ccf:/# uname -r
5.10.47-linuxkit

The output you’ll see depends on your host OS and kernel version. Don’t get surprised if you...

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