Nginx load balance with dedicated php-fpm server - php

Question

I got server setup with nginx+php-fpm and mysql.
I have another server with only installed php-fpm, so wanted to use as load balance.
But when I am using this dedacted server with php-fpm as load balancer, I got error when opening page: "Access denied."
/etc/nginx/nginx.conf
user www-data;
worker_processes 3;
error_log /var/log/nginx/error.log;
pid /var/run/nginx.pid;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
server_names_hash_bucket_size 64;
access_log /var/log/nginx/access.log;
sendfile on;
#tcp_nopush on;
keepalive_timeout 65;
tcp_nodelay on;
#gzip on;
upstream php {
server dedicatedserverip:9000;
}
include /etc/nginx/sites-enabled/*;
}
/etc/nginx/sites-enabled/site.org.conf
server {
listen 81;
server_name site.org www.site.org;
access_log /var/log/nginx/site.org.log;
error_log /var/log/nginx/site.org.log;
root /home/www/site.org;
index index.php;
location ~ .php$ {
fastcgi_pass php;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME /home/www/$fastcgi_script_name;
}
}
Why I got this error? When I change only the fastcgi_pass to 127.0.0.1:9000 - all work fine.

Answer 1

If it's a blank page with "Access denied" on it, it's caused by security.limit_extensions directive that has been added to php-fpm.
If you don't have it in your php-fpm configuration, it defaults to .php and prevents all other file types from being parsed by the PHP interpreter producing "Access denied" when trying to do so.

Answer 2

You received that error because the files PHP-FPM don't exist on the PHP-FPM server.
fastcgi_param SCRIPT_FILENAME /home/www/$fastcgi_script_name;
or (I use this because it's simpler for multiple vhosts)
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
It seems Nginx simply provides the PHP-FPM server with the location of the file, and the PHP-FPM server then renders it. The simplest solution is to rsync the document root to the PHP-FPM server.
This post can explain details: http://code.google.com/p/sna/wiki/NginxWithPHPFPM