From cyberciti.biz
Nginx is a lightweight, high performance web server/reverse proxy and e-mail (IMAP/POP3) proxy. It runs on UNIX, GNU/Linux, BSD variants, Mac OS X, Solaris, and Microsoft Windows. According to Netcraft, 6% of all domains on the Internet use nginx webserver. Nginx is one of a handful of servers written to address the C10K problem. Unlike traditional servers, Nginx doesn’t rely on threads to handle requests. Instead it uses a much more scalable event-driven (asynchronous) architecture. Nginx powers several high traffic web sites, such as WordPress, Hulu, Github, and SourceForge. This page collects hints how to improve the security of nginx web servers running on Linux or UNIX like operating systems.
p.s The nixCraft FAQ collection is now available to anyone who wants to browse it off-line in a PDF format. This tar ball contains 1530 Linux, *BSD, UNIX, Perl, Bash and scripting related faqs, mini-howtos, and tutorials compiled and written by Vivek Gite. Download nixcraft-faqs.tar (87M) tar ball which contains total 1530+ FAQ articles in a PDF format. (updated every week with new FAQs)