Load balancing reference architecture

Load balancing reference architecture and connections

For more information, see:

• Load balancing, sticky sessions, and Redis
• High availability reference architecture

The following diagram illustrates the load balancing reference architecture:

Load balancing reference architecture

Connections:

1. Internet → Firewall
   Clients (phones, laptops, tablets, desktops) connect to the system via the internet.
2. Firewall → Load Balancer
   Traffic from the internet passes through the firewall and is forwarded to the load balancer.
3. Load Balancer → Application Servers
   The load balancer distributes incoming traffic to multiple Indicium instances running on different application servers.
4. Application Servers → SQL Server
   Indicium instances connect to the database for authentication and data retrieval.
5. Load Balancer → Client Network
   The load balancer sends responses back to client devices.
6. Application Servers → Redis Cache (optional)
   If caching is enabled, the application servers interact with Redis for faster data retrieval.

Summary of key ports used in the architecture:

Port	Purpose
TCP 443	HTTPS traffic between clients, load balancer, and application servers
TCP 80	HTTP traffic (if HTTPS is not enforced)
TCP 1433	Microsoft SQL Server communication
TCP 6379	Redis Cache (if used)