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iptables -A INPUT -p tcp --syn -m limit --limit 10/s --limit-burst 20 -j ACCEPT
iptables -A INPUT -p tcp --syn -j DROP

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echo 1 > /proc/sys/net/ipv4/tcp_syncookies

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service <service_name> stop
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chkconfig <service_name> off

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http {
  ...
  upstream backend {
    server backend1.example.com;
    server backend2.example.com;
    server backend3.example.com;
  }

  server {
    listen 80;
    location / {
      proxy_pass http://backend;
    }
  }
}

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