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

Practical notes for writing software to run in a container


To use Kubernetes in your development process, one of the foundational requirements is running your code in a container. As you've seen, this adds a few steps to your development process. It also places a few more constraints around how you structure your code and interact with it, primarily so you can take advantage of the constraints to let Kubernetes do the work of running the processes, connecting them together, and coordinating any output. This is very different from many developers' habits of running one or more processes together, even with additional services needed for your application – such as databases or caches—on your local development machine.

This section provides some tips and suggestions on how to work with containers more effectively.

Getting options for your executable code

Aside from the ENTRYPOINT and CMD defined when you create your container, a container image can also define environment variables, usually via...