Attach Redis Adapter to Socket.IO
Update src/config/socket.js to initialize the Redis adapter.
The createAdapter() function receives the publisher and subscriber clients.
The resulting adapter is configured through the Socket.IO server's adapter option.
Updated src/config/socket.js
import { Server } from 'socket.io';
import { createAdapter } from '@socket.io/redis-adapter';
import { pubClient, subClient } from './redis.js';
export function initializeSocket(httpServer) {
const io = new Server(httpServer, {
adapter: createAdapter(pubClient, subClient)
});
return io;
}Configures Socket.IO to use Redis Pub/Sub for cross-instance broadcasting instead of relying only on its default in-memory adapter.
Key Takeaways
The adapter is configured during Socket.IO initialization.
Redis publisher and subscriber clients are shared with the adapter.
All instances must use compatible adapter configuration.