Book Image

Kubernetes for Developers

By : Joseph Heck
Book Image

Kubernetes for Developers

By: Joseph Heck

Overview of this book

Kubernetes is documented and typically approached from the perspective of someone running software that has already been built. Kubernetes may also be used to enhance the development process, enabling more consistent testing and analysis of code to help developers verify not only its correctness, but also its efficiency. This book introduces key Kubernetes concepts, coupled with examples of how to deploy and use them with a bit of Node.js and Python example code, so that you can quickly replicate and use that knowledge. You will begin by setting up Kubernetes to help you develop and package your code. We walk you through the setup and installation process before working with Kubernetes in the development environment. We then delve into concepts such as automating your build process, autonomic computing, debugging, and integration testing. This book covers all the concepts required for a developer to work with Kubernetes. By the end of this book, you will be in a position to use Kubernetes in development ecosystems.
Table of Contents (16 chapters)
Title Page
Packt Upsell
Contributors
Preface
Index

Common errors and how to resolve them


Throughout the book, we have provided examples that illustrate how to work with Kubernetes. In developing these examples, we hit all the same issues you are likely to encounter, some of them confusing—and it isn't always clear how to determine what the problem is and how to resolve it so that the system works. This section will go through a number of the errors that you might see, discuss how to diagnose them, and provide you with some techniques to help you understand if you see these same issues yourself.

Error validating data

When you are writing your own manifests for Kubernetes and using them directly, it is very easy to make simple mistakes that result in the error message : error validating ....

These are fortunately very easy to understand, if terribly inconvenient. To illustrate this example, I created a slightly broken deployment manifest:

When running kubectl apply with this manifest, you will receive an error:

error: error validating "test.yml...