nginx as a caching reverse proxy to replace squid/varnish

[Igor Sysoev]

On Mon, Aug 17, 2009 at 02:39:52PM -0700, mobiledreamers at gmail.com wrote:

> Hey guys
> the following is our current setup on the apps
> 
> but we would like to add nginx as a reverse proxy cache much like squid or
> varnish
> is it possible to edit this config to enable that caching behavior or do i
> need to add another nginx in front of this set up like i would do for squid
> or varnish
> 
> if this can be done without resorting to usage of squid and varnish it would
> be nice to have the complete setup in nginx
> 
> 
> 
> thanks a lot
> 
> 
>     upstream backend_appname{
> #start1.someserver.com
>          server start1.someserver.com:7810 fail_timeout=3s;
>          server start1.someserver.com:7811 fail_timeout=3s;
>          server start1.someserver.com:7812 fail_timeout=3s;
>          server start1.someserver.com:7813 fail_timeout=3s;
> 
> 
>     }
>     server {
>         server_name  appname.someserver.com;
> listen 80;
>         access_log   logs/access_appname.log;
>         #error_log   logs/error_appname.log;
> 
>         location /nginx_status {
>             stub_status on;
>             access_log   off;
>         }
> 
>         location /static {
>             root   /home/someuser/work/appname;
>             expires max;
>             add_header Cache-Control
> public,max-age=604800,post-check=604800,pre-check=1209600;
>         }
>         location / {
>             root   /home/someuser/work/appname;
>             fastcgi_pass backend_appname;
>           set  $addr  $remote_addr;
> 
>          if ($http_x_forwarded_for ~ "(?:^|,)\s*(\d+\.\d+\.\d+\.\d+)\s*$") {
>                set  $addr  $1;
>          }
> 
>             fastcgi_param SCRIPT_FILENAME $fastcgi_script_name;
>             fastcgi_param PATH_INFO       $fastcgi_script_name;
>             fastcgi_param QUERY_STRING    $query_string;
>             fastcgi_param CONTENT_TYPE    $content_type;
>             fastcgi_param CONTENT_LENGTH  $content_length;
>             fastcgi_param REQUEST_METHOD  $request_method;
>             fastcgi_param REMOTE_ADDR     $addr;
>             fastcgi_param REMOTE_PORT     $remote_port;
>             fastcgi_param SERVER_PROTOCOL $server_protocol;
>             fastcgi_param SERVER_ADDR     $server_addr;
>             fastcgi_param SERVER_PORT     $server_port;
>             fastcgi_param SERVER_NAME     $server_name;
> 
>         }
> 
>     }

Instead of

          set  $addr  $remote_addr;
 
          if ($http_x_forwarded_for ~ "(?:^|,)\s*(\d+\.\d+\.\d+\.\d+)\s*$") {
                set  $addr  $1;
          }

          fastcgi_param REMOTE_ADDR     $addr;

you should use

    set_real_ip_from   0.0.0.0/32;
    real_ip_header     X-Forwarded-For;

    fastcgi_param REMOTE_ADDR     $remote_addr;


-- 
Igor Sysoev
http://sysoev.ru/en/