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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

Product type Paperback

Published in Apr 2018

Publisher Packt

ISBN-13 9781788835268

Length 250 pages

Edition 1st Edition

Tools

Docker

Concepts

Serverless

Author (1):

Chanwit Kaewkasi

View More author details

Table of Contents (11) Chapters

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

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Wrapping a legacy with a function

In this section, we will demonstrate how to write a wrapper function for a legacy web-based system. To achieve this, we use the chromeless library (https://github.com/graphcool/chromeless) to connect to a headless Chrome instance. Then the chromeless script drives the Chrome browser to do the rest for us.

The following diagram shows the working mechanism of this part of the system:

Figure 8.11: Diagram of implementing an OpenFaaS function to wrap around a UI-based ERP

What does chromeless do? chromeless is a Node.js library that can be used to perform browser automation, similar to PhantomJS or Selenium. But it is really fast. Together with headless Chrome instances, chromeless yields a very fast performance. So it could be used as a serverless function.

We start by using FaaS CLI to create a project. We call this functionhivectl, a program to control an ERP program built with the Moqui framework, HiveMind. We will talk about HiveMind shortly after setting up...

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Authors (1)

Chanwit Kaewkasi

Chanwit Kaewkasi

Chanwit Kaewkasi is an assistant professor at the School of Computer Engineering, Suranaree University of Technology, Thailand. He started contributing code to the Docker Swarm project in its early day around 0.1. Later in 2016, he led the Swarm2K project together with contributors around the world to form the largest Docker Swarm cluster. Beside teaching and doing research in the field of software engineering, he provides consulting to several companies to help them adopt Docker, microservices, and FaaS technologies. He currently serves the Docker community as a Docker Captain.

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