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

Example – Python/Flask container image


To walk through the details of how to use Kubernetes, I have created two sample applications that you can download, or replicate to follow along and try out these commands. The first of these is a very simple Python application using the Flask library. The sample application is directly from the Flask documentation (http://flask.pocoo.org/docs/0.12/).

You can download a copy of this code from GitHub at https://github.com/kubernetes-for-developers/kfd-flask/tree/first_container. Since we will evolve these files, the code referenced here is available at the first_container tag. If you want to use Git to get these files, you can run the following commands:

git clone https://github.com/kubernetes-for-developers/kfd-flask

Then, go into the repository and check out the tag: 

cd kfd-flask
git checkout tags/first_container

Let's start with looking at the contents of a Dockerfile, which define what gets built into a container and how that happens.

The goals we have...