Book Image

The KCNA Book

By : Nigel Poulton
Book Image

The KCNA Book

By: Nigel Poulton

Overview of this book

There is a huge benefit in building small, specialized, single-purpose apps that can self-heal, auto scale, and update regularly without needing downtime. Kubernetes and cloud-native technologies come in handy in building such apps. Possessing the knowledge and skills to leverage Kubernetes can positively enhance possibilities in favor of architects who specialize in cloud-native microservices applications. ‘The KCNA Book’ is designed to help those working in technology with a passion to become certified in the Kubernetes and Cloud-Native Associate Exam. You will learn about containerization, microservices, and cloud-native architecture. You will learn about Kubernetes fundamentals and container orchestration. The book also sheds light on cloud-native application delivery and observability. It focuses on the KCNA exam domains and competencies, which can be applied to the sample test included in the book. Put your knowledge to the test and enhance your skills with the all-encompassing topic coverage. Upon completion, you will begin your journey to get the best roles, projects, and organizations with this exam-oriented book.
Table of Contents (12 chapters)
9
8: Sample test
Appendix B: Sample Test answers

Containerisation

In the early 2010’s Docker gave the world the gift of easy-to-use containers.

At a high level, containers are another form of virtualisation that allow us to run even more apps on less servers and deploy them even faster.

Figure 1.1 shows a side-by-side comparison of server virtualisation and container virtualisation.

Figure 1.1

As the image shows, server virtualisation slices a physical server into multiple virtual machines (VM). Each VM looks, smells, and feels like a physical server, meaning each one has virtual CPUs, virtual memory, virtual hard drives, and virtual network cards. You install an operating system (OS) on each one and then install one app per VM. If a single physical server is sliced into 10 virtual machines, there will be 10 operating systems and you can install 10 apps.

Container virtualisation slices operating systems into virtual operating systems called containers. Each container looks, smells, and feels like a normal...