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)
8: Sample test
Appendix B: Sample Test answers

Container orchestration fundamentals

As soon as we started using containers it became obvious we needed help managing them. This is because we were breaking large applications into lots of small loosely coupled microservices that were scaling up and down and we were rolling out new versions and updates all the time. As an example, a single large monolithic application that rarely changed would be replaced with a sprawling microservices application that changes all the time. Help was needed.

Tools like Docker Swarm, Kubernetes, and Mesosphere DCOS were created to help solve the problem. To cut a long story short, Kubernetes emerged as the most popular of those tools and is now the most important cloud native technology on the planet.

At a high level, Kubernetes is a container orchestrator. This means it runs and manages applications that run in containers. Part of this includes providing cloud native features such as scheduling, self-healing, and autoscaling.

Let’s consider...