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

Exam essentials

This chapter doesn’t map directly to an exam domain. However, the following exam topics were mentioned and will be covered in more detail later in the book.

Container runtimes
A server that runs containers is called a container host. They use a low-level tool called a container runtime to start and stop containers. Docker is the best-known container runtime and was the first container runtime supported by Kubernetes. However, it is being replaced in Kubernetes by a lighter-weight version called containerd (pronounced “container dee”). Many other container runtimes exist and some of them work differently. Some offer better performance at the expense of security, whereas others offer better security at the expense of size and performance. You’ll learn more later in the book.
Container security
All containers running on a single host share the host’s OS kernel. This makes them small, portable, and fast to start. However, if the...