The NodeJS Cluster Module
Free!
With Membership
$7.99
Suggested price

The NodeJS Cluster Module

About the Book

NodeJS processes runs on a single process, which means it does not take advantage from multi-core systems by default. If you have an 8 core CPU and run a NodeJS program via $ node app.js it will run in a single process, wasting the rest of CPUs.

Hopefully for us NodeJS offers the cluster module that contains a set of functions and properties that help us to create programs that uses all the CPUs. Not a surprise the mechanism the cluster module uses to maximize the CPU usage was via forking processes, similar to the old fork() system call Unix systems.

About the Author

Antonio Santiago
Antonio Santiago

Antonio is a Computer Science professional with more than ten years of experience in designing and implementing systems.

Since the beginning of his professional life, his work has been always related to the world of meteorology while working for different companies as an employee or freelancer. He is experienced in development of systems to collect, transform, store, analyze, and visualize data and is actively interested in any GIS-related technology, with preference for data visualization.

His main fields of experience is the Java and JavaScript ecosystems, and he has also worked actively with many related web technologies while looking to improve the client side of web applications.

He is a firm believer in Software Engineering practices and is a follower of Agile methodologies, involving customers as a main key to the project’s success.

Table of Contents

  • Understanding the NodeJS cluster module
    • Introducing the cluster module
    • A basic example
    • Comunicating master and worker processes
    • Conclusion
  • Using cluster module with HTTP servers
    • How cluster module works with network connections ?
    • Other alternatives to cluster module load balancing
    • Conclusions
  • Using PM2 to manage NodeJS cluster
    • Introducing PM2
    • Conclusions
    • References
  • Graceful shutdown NodeJS HTTP server when using PM2
    • Starting a HTTP server
    • How to shutdown properly an HTTP server ?
    • Graceful shutdown/restart with and without PM2
    • Conclusions

The Leanpub 60 Day 100% Happiness Guarantee

Within 60 days of purchase you can get a 100% refund on any Leanpub purchase, in two clicks.

Now, this is technically risky for us, since you'll have the book or course files either way. But we're so confident in our products and services, and in our authors and readers, that we're happy to offer a full money back guarantee for everything we sell.

You can only find out how good something is by trying it, and because of our 100% money back guarantee there's literally no risk to do so!

So, there's no reason not to click the Add to Cart button, is there?

See full terms...

Earn $8 on a $10 Purchase, and $16 on a $20 Purchase

We pay 80% royalties on purchases of $7.99 or more, and 80% royalties minus a 50 cent flat fee on purchases between $0.99 and $7.98. You earn $8 on a $10 sale, and $16 on a $20 sale. So, if we sell 5000 non-refunded copies of your book for $20, you'll earn $80,000.

(Yes, some authors have already earned much more than that on Leanpub.)

In fact, authors have earnedover $13 millionwriting, publishing and selling on Leanpub.

Learn more about writing on Leanpub

Free Updates. DRM Free.

If you buy a Leanpub book, you get free updates for as long as the author updates the book! Many authors use Leanpub to publish their books in-progress, while they are writing them. All readers get free updates, regardless of when they bought the book or how much they paid (including free).

Most Leanpub books are available in PDF (for computers) and EPUB (for phones, tablets and Kindle). The formats that a book includes are shown at the top right corner of this page.

Finally, Leanpub books don't have any DRM copy-protection nonsense, so you can easily read them on any supported device.

Learn more about Leanpub's ebook formats and where to read them

Write and Publish on Leanpub

You can use Leanpub to easily write, publish and sell in-progress and completed ebooks and online courses!

Leanpub is a powerful platform for serious authors, combining a simple, elegant writing and publishing workflow with a store focused on selling in-progress ebooks.

Leanpub is a magical typewriter for authors: just write in plain text, and to publish your ebook, just click a button. (Or, if you are producing your ebook your own way, you can even upload your own PDF and/or EPUB files and then publish with one click!) It really is that easy.

Learn more about writing on Leanpub