What is your experience working with Nginx for load…

I know Nginx as a high-performance reverse proxy and web server, actively using it for load balancing configuration.

Types of load balancing I have worked with:

Round Robin: Distributes requests evenly across servers in the pool. Simple but does not consider server load.

upstream backend {
    server 192.168.1.100;
    server 192.168.1.101;
    server 192.168.1.102;
}

server {
    listen 80;

    location / {
        proxy_pass http://backend;
    }
}

Least Conn (Least Connections): Sends requests to the server with the fewest active connections. More efficient under uneven load.

upstream backend {
    least_conn;
    server 192.168.1.100;
    server 192.168.1.101;
    server 192.168.1.102;
}

// ... rest of server configuration

IP Hash: Distributes requests based on the client's IP address. Ensures requests from the same client go to the same server, useful for stateful applications.
```
upstream backend {
    ip_hash;
    server 192.168.1.100;
    server 192.168.1.101;
    server 192.168.1.102;
}

// ... rest of server configuration
```

Generic Hash: Distributes requests based on arbitrary text, key, or variable, using a hash function.

upstream backend {
    hash $request_uri consistent; # Using request URI
    server 192.168.1.100;
    server 192.168.1.101;
    server 192.168.1.102;
}

// ... rest of server configuration

Random: Selects a server randomly. Optionally, two least_conn can be used to choose between two randomly selected servers, preferring the one with fewer connections.

upstream backend {
    random two least_conn;
    server 192.168.1.100;
    server 192.168.1.101;
    server 192.168.1.102;
}

// ... rest of server configuration

I use proxy_next_upstream directives to define conditions under which requests are redirected to the next server in the pool (e.g., on errors 502, 503, or timeout). I also configure health checks using the health_check option (available in Nginx Plus) or external tools that check server availability and dynamically update the Nginx configuration file.

My experience includes setting up keepalive connections to backend servers to reduce connection overhead. I work with SSL/TLS termination on Nginx to reduce backend load.

For monitoring upstream server status, I use the Nginx status page available via the ngx_http_stub_status_module or ngx_http_api_module (for Nginx Plus). I integrate monitoring with Prometheus and Grafana for metrics visualization and alerting.

I deploy Nginx in Docker containers and orchestrators like Kubernetes, often using it as an Ingress controller for traffic load balancing to services.

I have worked with various scenarios, including:

Load balancing of HTTP/S web application traffic.
Load balancing of TCP traffic for databases or other services.
Using Nginx as a caching proxy in front of backend servers.

I can optimize Nginx configuration for high performance, including tuning worker processes, worker connections, and buffering. I use nginx -t to check configuration syntax and nginx -s reload to apply changes without stopping the service.

Overall, I am confident in configuring Nginx to implement various load balancing strategies in production environments.

What is your experience working with Nginx for load balancing setup?