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Docker for Serverless Applications

You're reading from   Docker for Serverless Applications Containerize and orchestrate functions using OpenFaas, OpenWhisk, and Fn

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Product type Paperback
Published in Apr 2018
Publisher Packt
ISBN-13 9781788835268
Length 250 pages
Edition 1st Edition
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Author (1):
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Chanwit Kaewkasi Chanwit Kaewkasi
Author Profile Icon Chanwit Kaewkasi
Chanwit Kaewkasi
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Table of Contents (11) Chapters Close

Preface 1. Serverless and Docker 2. Docker and Swarm Clusters FREE CHAPTER 3. Serverless Frameworks 4. OpenFaaS on Docker 5. The Fn Project 6. OpenWhisk on Docker 7. Operating FaaS Clusters 8. Putting Them All Together 9. The Future of Serverless 10. Other Books You May Enjoy

Invoking functions


This section describes the internal flow of how OpenWhisk invokes its actions. We will learn how to create (or register) a Docker container as an OpenWhisk action and how to invoke it.

Invocation flows

As OpenWhisk is an event-driven platform, any kind of event fired to it could be intercepted and interpreted. However, in this example, we will show you only the event triggered by sending a direct request to the gateway.

The invocation flow starts with an invocation request in the form of an HTTP-based request and is sent to the API gateway. For example, we can use the wsk CLI to initiate this kind of request. After the API gateway receives the request, it will forward that call to a controller behind it.

One of the most important components of OpenWhisk is the controller. The controller is a component written in Scala using the infamous framework Akka and Spray to implement a set of REST APIs. The controller accepts all kinds of requests; if it accepts a POST request, it will...

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