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The KCNA Book

You're reading from The KCNA Book

Product type Book

Published in Jun 2023

Publisher Packt

ISBN-13 9781835080399

Pages 197 pages

Edition 1st Edition

Languages

Concepts

Containerization

Author (1):

Nigel Poulton

Table of Contents (12) Chapters

1. Getting started

2. 1: Setting the scene

3. 2: Cloud native architecture

4. 3: Container orchestration

5. 4: Kubernetes Fundamentals

6. 5: Cloud native application delivery

7. 6: Cloud native observability

8. The exam

9. 8: Sample test

10. What next

Appendix A: Chapter quiz answers

1. Appendix B: Sample Test answers

Resiliency

Resilient applications and infrastructure can self-heal when things break. In fact, sometimes we call resiliency “self-healing”.

A simple infrastructure example is a node pool. Most cloud platforms let you create a pool of virtual servers called a node pool. If you configure one with 10 virtual servers, and one of them fails, the system can self-heal by spinning up a new node and automatically adding it to the pool.

Kubernetes offers self-healing capabilities for applications and infrastructure. For example, if Kubernetes knows you need 5 containers for a web front-end microservice, and one of them fails, it spins up a new one so you still have 5.

Although these are simple examples, combining resilient applications with resilient infrastructure is extremely powerful.

Loose coupling and building for failure

A key principle when designing resilient systems is to expect things to fail. This forces you to build stuff that can handle failures. A popular and...

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Authors (1)

Nigel Poulton

Nigel Poulton is a cloud-native subject matter expert who spends his life creating books and training videos on the latest cloud technologies. He is the author of best-selling books on Docker and Kubernetes and the most popular online training videos on the same topic. He is a Docker Captain. Prior to this, Nigel has held various infrastructure roles for large enterprises. When he is not playing with technology, he is dreaming about it. When he is not dreaming about it, he is reading and watching sci-fi. He wishes he lived in the future so he could explore spacetime, the universe, and tons of other mind-blowing stuff. He likes cars, football (soccer), and food. He has a fabulous wife and three children.

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