Getting Started with Nginx: The Gatekeeper of High-Performance Web Services

As April 2020 began, the number of backend services I was responsible for kept growing, and how to expose these services to external users efficiently and securely became a new challenge. That is why I started learning and using a piece of software that is legendary in the web services world — Nginx.

What is Nginx?

Nginx is a high-performance HTTP and reverse proxy web server. Renowned for its high concurrency and low memory footprint, it is the go-to "gatekeeper" for building modern, high-traffic websites and applications.

My Learning and Practice

As I learned, I focused on mastering several core features and use cases of Nginx:

Static web server: Nginx delivers static files (such as HTML, CSS, JavaScript, and images) with outstanding performance. I learned how to configure location blocks to route requests for specific URLs to static file directories on the server.
Reverse proxy: This is the most central and most widely used feature of Nginx. In our systems, backend applications (such as Spring Boot services) usually run on non-standard ports like 8080. By using Nginx as a reverse proxy, we can forward requests coming in on the standard HTTP/HTTPS ports (80/443) to the backend application servers securely and efficiently. This not only hides the real addresses of the backend services and improves security, but also opens the door to load balancing and future scaling.
```
server {
    listen 80;
    server_name your.domain.com;

    location / {
        proxy_pass http://localhost:8080;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
    }
}
```
Load balancing: When our backend services are deployed with multiple instances to handle high concurrency, Nginx can act as a simple yet efficient load balancer. Through the upstream module, it distributes incoming requests across multiple backend service instances using strategies such as round-robin, weighted, and ip_hash, achieving horizontal scaling of the service.

Summary

Learning Nginx was a very important addition to my backend skill tree. It pushed me beyond just developing applications themselves and got me thinking about problems from the perspective of overall web service architecture. Understanding and mastering Nginx is an essential step for every backend developer, especially those aspiring to become architects. It laid a solid foundation for me to build more complex, more robust distributed systems later on.