Nginx load balancing

Documentation

intro

https://www.nginx.com/products/nginx/load-balancing/

Tutorials

digitalocean

https://www.digitalocean.com/community/tutorials/how-to-set-up-nginx-load-balancing

Identical Servers in a Cluster

http {
  upstream  my_upstream {
    server server1.example.com;
    server server2.example.com;
  }

  server {
    listen 80;
    location / {
      proxy_set_header   Host $host;
      proxy_pass         http://my_upstream;
    }
  }
}