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 networking

Containers and microservices bring all of the following networking challenges.

  • Increased east-west traffic
  • Service discovery
  • Tracing requests
  • IP churn
  • Security

East-west network traffic is jargon for containers in the same application talking to each other on the same networks. The other type of traffic flow is called north-south and is applications talking to external services. Consider a simple example of a microservices application with a web front-end service and a shopping cart service. Traffic between the front-end and the shopping cart containers is east-west traffic on the same network. The traffic between the front-end and external client, such as a customer’s mobile phone app, is north-south and over untrusted networks such as the internet.

Microservices architectures split complex applications into lots of small applications that all talk to each other over the network. This massively increases east-west traffic and requires traffic...