Scaling Websockets with Redis, HAProxy and Node JS - High-availability Group Chat Application

In this video I want to demonstrate how to scale websockets connection to multiple servers using a load balancer such as HAProxy.

0:00 Intro
1:00 What are WebSockets?
2:40 WebSockets Scaling
7:44 Chat WebSocket App Code

* WebSockets
* WebSockets Scaling
* Live chat application (microservices)
* Demo

Source Code

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Hussein

[johnstorm]

This hits a sweet spot between a few things: a complex topic like load balancing, docker and docker compose (just the tip), and sockets, all under a practical example. This is great. Thank you!

[ZoraciousDCree]

Really appreciate all that you have to offer! Good pace in presentation, interesting side notes, and keeping it fun. Thanks.

[YGNCode]

This is really awesome. My current company using websocket and still don't need to scale. But, it might be in the future, so I was checking around. You video explain very well. Thanks

[dearvivekkumar]

Hi Hussein,

Thanks for making all these great videos, these days I used to check daily if you have uploaded any video or not. All your videos are very useful and answering lots of my doubts.

[DiaryOfMuhib]

I was really struggling with WebSocket scaling. Nicely explained!

[jackykwan]

Really wonderful video, keep going !!
I love how you simplify the talk, and with a practical POC example !

[jongxina]

Dude you have no idea how GLAD I am to have found this video! Amazing 😀

[hoxorious]

By far one of the best channels I have ever subscribed to 👍

[zcong]

Very nice video, this provides a reasonable good depth of the architeture details of how to build a real time application, and especially how the redis (or any application can work as a broker) plays in this architectures. Thank you!

[ryanquinn]

Such a quick powerful demo.
If you’re breaking Redis you’re already gonna need to be doing more advanced stuff than this haha.

[jackcurrie]

Your channel is fantastic Hussein, thanks for making such great content!

[lonewolf]

You just solved one of my biggest problems...thanx a ton

[peterlau]

Really appreciate the video! Perhaps can also cover the db design/optimization for a chat app?
I believe many interesting topics like sharding, and database selection can be covered; thanks and looking forward to future videos!

[rajatahuja]

I was looking for the same. You rock :)

[programmer]

Brilliant. Inspirational. Thank you very much.

[letsflow.oficial]

Hey Hussein, first of all, I need to say that I love your videos, they are very informative and very clear, even satisfatory for relaxing purposes kkkk relax while we learn :) Thank you for this video on websockets and redis. Could you please, explain how we could use this architecure to spin up a model handling? Let's supose a database to store all the messages and a central copy of the model, with disbributed copies of the model in each client. Then we would use the command pattern to alter the model based on commands, keeping a stack of commands, and maybe a snapshot to replay comands and have the ability do do and undo changes to the model. I'm facing this challenge right now and would love to hear from you on that.

[mytheens]

I wish I could get you as my senior developer.

[hichem]

thank you, this video solve the big problem that I have

[earlvhingabuat]

New Subscriber Here! Thanks for this awesome video!

[ragavkb]

Good video and i enjoyed it. In your example you stored the connections in an array in the nodejs. Is this typically how real world application do or are there any patterns ? It would be nice to have tutorials on connection drop from a client and how things get cleaned up eventually on the server.