Nginx and proxy_cache does seem to be used

I’m a scalr.net user. Scalr.net is a management system that sits on top
of Amazon Web Services. It does use nginx as load balancer when you
build a farm with app servers behind it. I was fine with it until I
reached an important number of users.

So I looked for a solution to cache the requests. I first ugrade the
original Ubuntu 8.04 with nginx 0.5.3 to the 0.6.38 version of nginx and
I notice that proxy_store was not what I was looking for. Then I updated
nginx to the 0.7.61 version and use proxy_cache. If I got it correctly
it should do what squid or varnish can do. But it doesn’t seem to work
and I don’t know how to verify it.

The configuration file that I put below is the original scalr
configuration file with the adjustements I made for caching the contents
(in red). First, could you tell me if nginx can handle what I’m looking
for. Then, if the proxy_cache is the right way to go and why it doesn’t
seem it to work. Finally how I can be sure that the files stored under
proxy_cache_path are used.

nginx.conf from scalr.net with adjustment in red for caching successfull
requests for 3 hours.

user www-data;
worker_processes 4;

error_log /var/log/nginx/error.log;
pid /var/run/nginx.pid;

events {
worker_connections 4096;
}

http {
include /etc/nginx/mime.types;
default_type application/octet-stream;

access_log /var/log/nginx/access.log;

sendfile on;

keepalive_timeout 30;
tcp_nodelay on;

include /etc/nginx/app-servers.include;

proxy_cache_path /var/www/fbcaldotcom/cache levels=1:2
keys_zone=one:10m;

server {
listen 80;

   if ( $remote_addr = 127.0.0.1 ) {
       rewrite   ^(.*)$  /500.html last;
       return 302;

   }

   location /    {
       proxy_pass         http://backend;

       proxy_redirect off;
       proxy_cache one;
       proxy_cache_valid 200 3h;

       proxy_buffering    on;

       proxy_set_header   Host             $host;
       proxy_set_header   X-Real-IP        $remote_addr;
       proxy_set_header   X-Forwarded-For 

$proxy_add_x_forwarded_for;

       error_page   500 501  =  /500.html;
       error_page   502 503 504  =  /502.html;
   }

   location /500.html {
           root   /var/www/nginx-default;
   }

   location /502.html {
           root   /var/www/nginx-default;
   }

}

}

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,5281,5281#msg-5281

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