Nginx double requests for my upstreams?

[funkdoobiest]

Hi,

I have a strange behavior for my site load balanced with nginx.
I have 1 Loadbalancer with nginx and 3 servers with apache.

sometimes a request  is doubled and send to 2 of my apache webservers.
this is a big problem for me, because this is sometimes a requests that is doing a payement.
I checked this behavior with doing a log of all my payment transactions and there a some transactions
for the same person double at the same second! (the user can't do this at the website, because I send the form which is doing the request with JS and ask the User if he really wants to pay and so on)

Here are my config files for nginx, please help me:


#ningx.conf
user  www-data;
worker_processes  4;

error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  512;
}

http {

	include       mime.types;
	include       proxy.conf;

    access_log  logs/access.log  combined;

    sendfile        on;
    tcp_nopush     on;

    keepalive_timeout  0;
    #keepalive_timeout  15;

    #gzip  on;


	include 	upstream.conf;

	include server_www.conf;



	
}



# proxy.conf
proxy_redirect          off;
proxy_set_header        Host            $host;
proxy_set_header        X-Real-IP       $remote_addr;
proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
client_max_body_size    10m;
client_body_buffer_size 128k;
proxy_connect_timeout   90;
proxy_send_timeout      90;
proxy_read_timeout      90;
proxy_buffers           32 4k;




#upstream.conf
  upstream webseite {
    ip_hash;
    server 10.XXX.XX.1:8081;
    server 10.XXX.XX.2:8081;
    server 10.XXX.XX.3:8081;
  }



#server_www.conf
server {
    listen 80;
    server_name www.website.com;
    
    
    # serve static files
	location ~* ^.+.(jpg|jpeg|gif|css|png|js|ico|html|htm|swf)$ {
            root    /var/www/www.website.com/;
            expires 1d;
    }
            
    location / {
      proxy_pass http://webseite;
    }
}


Thank you!

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,2644,2644#msg-2644