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

Primer

Containers are similar to virtual machines – both allow you to run multiple applications on a single physical server. However, there are important differences.

At a high level, containers are more lightweight than virtual machines. This means the same server can run more containers than virtual machines. As they’re both technologies for running applications, containers let you run more applications on your servers. For example, a server that can run 10 virtual machines might be able to run 50 containers. This enables huge cost savings for organisations – you need less infrastructure to run your apps. Being lightweight also means containers start faster than virtual machines and are easier to package and share.

Container workflow

The following list shows the common steps involved in creating and running an application as a container.

  1. A developer writes an application
  2. The application is packaged as a container image
  3. The container image is uploaded...