Load balancer (Networking)

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Load balancing across multiple application instances is a commonly used technique for optimizing resource utilization, maximizing throughput, reducing latency, and ensuring fault‑tolerant configurations.


Load balancing in Nginx is configured using upstream directive.[1].

Network load balancer can provide service for different protocols, such as TCP, UDP, HTTP or HTTPS.


Typical options:

Nginx configuration example

upstream backend {
    # no load balancing method is specified for Round Robin. Other options: least_conn, ip_hash, least_time header, random two least_time=last_byte
    server backend1.example.com slow_start=30s;
    server backend2.example.com max_conns=3;
    server backend3.example.com;
    server 192.0.0.1 backup;
}

Related terms

See also

  • https://docs.nginx.com/nginx/admin-guide/load-balancer/http-load-balancer/#overview
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