Help with Keepalive on NGINX

[Nick Toseland]

Hi All,

I am struggling to get keepalives to work on Nginx, I believe I have 
added the necessary configuration. Can you take a look and suggest where 
I may be going wrong or what I am missing?

We have a nginx server that sits in front of a varnish server which sits 
in front of the back-end servers

http {

     keepalive_timeout  120;
     keepalive_requests 500;

     upstream varnish_rand {
         server 172.21.1.1:80;
         keepalive 256;
     }

     server {
         server_name    www.abc.com

         location / {

             proxy_pass   http://varnish_rand;
             proxy_http_version 1.1;

             }
}

You can see that the nginx server is using HTTP1.1 to communicate with 
Varnish

*varnishtop -i RxProtocol *
list length 1

      9.67 RxProtocol     HTTP/1.1

However there nginx always send a "connection close"

*varnishtop -c -i RxHeader -I "Connection"*

list length 1

      9.59 RxHeader     Connection: close


Thanks in advance

Nick


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