Book Image

Kubernetes for Serverless Applications

By : Russ McKendrick
Book Image

Kubernetes for Serverless Applications

By: Russ McKendrick

Overview of this book

Kubernetes has established itself as the standard platform for container management, orchestration, and deployment. It has been adopted by companies such as Google, its original developers, and Microsoft as an integral part of their public cloud platforms, so that you can develop for Kubernetes and not worry about being locked into a single vendor. This book will initially start by introducing serverless functions. Then you will configure tools such as Minikube to run Kubernetes. Once you are up-and-running, you will install and configure Kubeless, your first step towards running Function as a Service (FaaS) on Kubernetes. Then you will gradually move towards running Fission, a framework used for managing serverless functions on Kubernetes environments. Towards the end of the book, you will also work with Kubernetes functions on public and private clouds. By the end of this book, we will have mastered using Function as a Service on Kubernetes environments.
Table of Contents (13 chapters)

Hello world

To start off with we are going to look at deploying two very simple hello world functions. The first simply prints Hello World! and the second takes an input and then displays it back to you.

The basic example

First of all, we need our function. The static hello-world function requires the following three lines of Python code:

import json
def handler():
return "Hello World!"

Place the preceding code, which is also available in the Chapter04/hello-world folder of the GitHub repository that accompanies this book, in a file called hello.py.

Now we have our function we can deploy it into the default namespace by running the following command:

$ kubeless function deploy hello \
--from-file hello.py
--handler...