NGINX 500 http error

[fatine,al]

Hi,

I have a lot of 500 http error in nginx access.log.
I think it's due to the number of requests that nginx receives. Because when
I was testing the configuration with one ip adress I don't have this error
but when I redirect all client traffic (sometimes more than 2000
simultaneous connexions) to nginx I'm getting 500 http error.
I don't have any error log in error.log.

I tried to modify this parameters : worker_connections,
worker_rlimit_nofile, keepalive_timeout, proxy_connect_timeout ...

And then I start to get this logs in error.log :
      worker process XXXXX exited on signal 11
      an upstream response is buffered to a temporary file
/var/lib/nginx/proxy/2/00/0000000002
      failed (104: Connection reset by peer) while sending response to
client


Here is my nginx.log conf :

user www-data;
worker_processes 4;
worker_rlimit_nofile 50000;
pid /var/run/nginx.pid;

events {
        worker_connections 50000;
}

http {

        sendfile on;
        tcp_nopush on;
        tcp_nodelay on;
        keepalive_timeout 20;

        types_hash_max_size 2048;
        include /etc/nginx/mime.types;
        default_type application/octet-stream;

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

        gzip on;
        gzip_disable "msie6";
 
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 50M;
proxy_connect_timeout   600;
proxy_send_timeout      600;
proxy_read_timeout      600;
proxy_buffer_size   128k;
proxy_buffers       4   254k;
proxy_busy_buffers_size 256k;

        include /etc/nginx/sites-enabled/*;
}

When I execute top command, cpu and RAM usage are not hignt (max cpu 7% and
ram 4%).

Any help would be appreciated.
Thanks.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,244693,244693#msg-244693