Error: No input file specified
1. Most Likely you do not have the SCRIPT_FILENAME containing the full path to your scripts. If the configuration of nginx (fastcgi_param SCRIPT_FILENAME) is correct, this kind of error means php failed to load the requested script. Usually it is simply a permissions issue, you can just run php-cgi as root
# spawn-fcgi -a 127.0.0.1 -p 9000 -f /usr/bin/php-cgi
or you should create a group and user to start the php-cgi. For example:
# groupadd www
# useradd -g www www
# chmod +w /srv/www/nginx/html
# chown -R www:www /srv/www/nginx/html
# spawn-fcgi -a 127.0.0.1 -p 9000 -u www -g www -f /usr/bin/php-cgi
2. Another occasion is that, wrong "root" argument in the "location ~ \.php$" section in nginx.conf, make sure the "root" points to the same directory as it in "location /" in the same server. Or you may just set root as global, do not define it in any location section.
3. Verify that variable "open_basedir" in /etc/php/php.ini also contains path you specified in "root" argument in nginx.conf
4. Also notice that not only php script should have read permission, but also the entire directory structure should have execute permission so that PHP user can traverse the path.
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