The Socket.IO Redis adapter uses Redis Pub/Sub to distribute events between multiple Socket.IO server instances.

Each server connects to Redis using two clients:

- Publisher client: Publishes events to Redis channels.
- Subscriber client: Receives events published by other server instances.

When one server broadcasts an event to a room, the Redis adapter distributes the broadcast to other Socket.IO servers.

Those servers then deliver the event to their locally connected clients.

This allows users connected to different application instances to communicate through the same logical Socket.IO rooms.

Redis Adapter Components

Socket.IO Redis Adapter Architecture

Understand the Redis Adapter

Introduction to Socket.IO

Environment and Project Setup

Create the Express and Socket.IO Server

Connect the Browser to Socket.IO

Implement Real-Time Messaging

Master Socket.IO Events and Acknowledgements

Implement Socket.IO Rooms and Private Messaging

Socket.IO Authentication and Security

Connection Lifecycle and Reconnection

Testing and Troubleshooting

Scale Socket.IO Using Redis Adapter

Production Deployment and Best Practices

Install Redis Adapter Dependencies

Why Do We Need Socket.IO Scaling?

Learn Socket.IO from scratch by building a real-time chat application with Express, rooms, private messaging, authentication, and Redis scaling.

Socket.IO with Node.js: Build a Complete Real-Time Chat Application

Understand the Redis Adapter - Socket.IO with Node.js: Build a Complete Real-Time Chat Application

Understand the Redis Adapter

Redis Adapter Components

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