Golang + Gin + Postgres + Docker + gRPC + NGINX

Technologies used

• Gin as HTTP web framework
• PostgreSQL as database
• SQLC as code generator for SQL
• golang-migrate for database migration
• gRPC Remote procedure call framework.
• Docker for containerizing the application
• NGINX as a load balancer and reverse proxy
• Protoc as protocol buffer compiler

docker compose up --build

OR

docker compose -f docker-compose-lb.yml up --build

This will run the 4 instances of our Go server in 4 different containers, each running on a different port and an NGINX load balancer to distribute the load between the 4 instances Each instance or container will be running two servers, one for gRPC and as an HTTP Gateway server. The NGINX will do two things:

• Load balance the incoming HTTP requests between the 4 HTTP Gateway servers running in the 4 instances
• Load balance the incoming gRPC requests between the 4 gRPC servers running in the 4 instances

NGINX Load Balancer opens two ports:

• Port 80, which maps to port 3050 for incoming HTTP requests
• Port 9090, which maps to same port 9090 for incoming gRPC requests

To send HTTP requests to the NGINX load balancer (which will distribute the requests between the 4 HTTP Gateway servers), just open web browser or Postman and send requests to http://localhost:3050

Swagger UI to view the API documentation http://0.0.0.0:3050/swagger/

To send gRPC requests to the NGINX load balancer (which will distribute the requests between the 4 gRPC servers), you can use the Evans CLI tool to send gRPC requests to the NGINX load balancer. Run the following command:

evans --port 9090 --host localhost -r repl;