Book Image

Serverless Architectures with Kubernetes

By : Onur Yılmaz, Sathsara Sarathchandra
Book Image

Serverless Architectures with Kubernetes

By: Onur Yılmaz, Sathsara Sarathchandra

Overview of this book

Kubernetes has established itself as the standard platform for container management, orchestration, and deployment. By learning Kubernetes, you’ll be able to design your own serverless architecture by implementing the function-as-a-service (FaaS) model. After an accelerated, hands-on overview of the serverless architecture and various Kubernetes concepts, you’ll cover a wide range of real-world development challenges faced by real-world developers, and explore various techniques to overcome them. You’ll learn how to create production-ready Kubernetes clusters and run serverless applications on them. You'll see how Kubernetes platforms and serverless frameworks such as Kubeless, Apache OpenWhisk and OpenFaaS provide the tooling to help you develop serverless applications on Kubernetes. You'll also learn ways to select the appropriate framework for your upcoming project. By the end of this book, you’ll have the skills and confidence to design your own serverless applications using the power and flexibility of Kubernetes.
Table of Contents (11 chapters)
2. Introduction to Serverless in the Cloud

OpenWhisk Actions

In OpenWhisk, actions are code snippets written by developers that will be executed in response to events. These actions can be written in any programming language supported by OpenWhisk:

  • Ballerina
  • Go
  • Java
  • JavaScript
  • PHP
  • Python
  • Ruby
  • Swift
  • .NET Core

Also, we can use a custom Docker image if our preferred language runtime is not supported by OpenWhisk yet. These actions will receive a JSON object as input, then perform the necessary processing within the action, and finally return a JSON object with the processed results. In the following sections, we will focus on how to write, create, list, invoke, update, and delete OpenWhisk actions using the wsk CLI.

Writing Actions for OpenWhisk

When writing OpenWhisk actions with your preferred language, there are few standards that you must follow. They are as follows:

  • Each action should have a function named main, which is the entry point of the action. The source...