Run multiple instances of your hub behind a Load Balancer .

If you are using WebSockets, ensure your load balancer supports "sticky sessions" so a user stays connected to the same hub instance during their session. Conclusion

Since the hub is the central point of contact, it is also the primary target for attacks.

Use a centralized logger (like Winston or ELK Stack ) so you can see exactly where a packet dropped within the hub's logic. 5. Final Deployment & Scaling

Building a server-side hub is about moving from "direct communication" to "orchestrated communication." By centralizing your logic, you make your entire ecosystem easier to monitor, secure, and scale.

When Server A receives an update, it sends a message to the Hub. The Hub then broadcasts that message only to the specific clients who need to see it, reducing unnecessary bandwidth. 3. Security: The "Gatekeeper" Role