This document describes the architecture for a large-scale web socket system designed for scalability on public cloud infrastructure. The system uses Amazon EC2 servers, DNS load balancing, proxy workers, and app workers to support low-latency command and control of multiple IP cameras over web socket connections while ensuring security. Stateless app workers connect to a central database for session information.

1. Large scale web
socket system
TrucLK- afterlastangel@gmail.com

2. System Purpose
- Scalability on public cloud infrastructure
- Low latency command control
- Security.

3. Architecture
Amazon EC2
IP
Camera
IP
Camera
IP
Camera
Server
Server
Server
Web Socket Connection
Web Socket Connection
Web Socket Connection
Video Stream
TLS Authentication
Control command

4. Web Socket
DNS Load balancing App worker
DNS query
Scalable Architecture
Amazon EC2
IP
Camera
IP
Camera
App worker
Video Stream
Control command
App worker
Database
Proxy
worker
Proxy
worker
Web Socket

5. DNS Load balancing
- First load balancing.
- Resolve concurrent TCP connections
problem.
- Software:

6. Proxy worker
- Client authentication with TLS.
- Sharding client with app workers.
- Software:

7. App worker
- Any web applications: Ruby, Java, Python,
PHP …
- Stateless with central session database.

8. Database
- Does not need to be distributed
- Should be support auto scaling
- Suggestion: NoSQL instead of SQL

9. Estimation
- Complexity : Average
- Duration : 2 months