Si tu as suivi le script nginx + rutorrent tu peux faire un vhost nginx :
server {
listen 80;
server_name ddl.ndd.fr;
root /home/user/torrents;
index index.php; #si besoin
include /etc/nginx/conf.d/php.conf;
include /etc/nginx/conf.d/cache.conf;
autoindex on; #active le directory listing
}