cd /etc/nginx/sites-available
mv default orig

default :

server {
    location / {
        proxy_pass http://www.linuxhotel.de:80;
    }
}

nginx -t

nginx -s reload

server {
    location / {
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_pass http://www.linuxhotel.de:80;
    }
}

upstream loadbalance {
  server 192.168.222.11;
  server 192.168.210.10;
  server 192.168.229.225;
  server 192.168.232.101;
}
server {
    location / {
        proxy_pass http://loadbalance;
    }
}

https://docs.nginx.com/nginx/admin-guide/web-server/reverse-proxy/