vnStatSVG should be the best web front-end to vnStat (a network traffic logger).
It only requires a CGI-supported http server setup but also generates a great graphical report with SVG. NO PHP REQUIRED!
It works for Linux server, cluster and even for a busybox based embedded Linux system.
It has been tested with Apache, Nginx and even the lightweight httpd server of Busybox.
vnStatSVG is friendly to generic Linux hosts, servers, embedded Linux systems and even Linux clusters...