Can you give an example of using load balancers in a system?

Load balancers are used to distribute incoming traffic across multiple servers or services to ensure high availability and scalability of the system. For example, in a web application, a load balancer can accept all HTTP requests and evenly distribute them among several application instances so that no single server is overwhelmed.

Use cases:

• In AWS cloud infrastructure, Elastic Load Balancer (ELB) automatically distributes traffic among EC2 instances.
• In Kubernetes, Ingress Controller or LoadBalancer type Service is used to distribute requests among pods.

Example configuration of Nginx as a load balancer:

http {
    upstream backend {
        server backend1.example.com;
        server backend2.example.com;
    }

    server {
        listen 80;

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