client.identity and client director -- How?

[Caunter, Stefan]

Use an if in vcl_recv. If you need to stick based on cookie, use that header; I use X-F-F for a load-balancer setup.

 

sub vcl_recv {

# set client.identity based on x-f-f header, use that to stick to a backend server

 

                if (req.http.x-forwarded-for) {

                        set client.identity = req.http.x-forwarded-for;

                        set req.backend = tomcat;

                }

                # more stuff goes here

                return(lookup);

}

 

Stefan Caunter :: Senior Systems Administrator :: TOPS

e: scaunter at topscms.com  ::  m: (416) 561-4871

www.thestar.com www.topscms.com

 

From: varnish-misc-bounces at varnish-cache.org [mailto:varnish-misc-bounces at varnish-cache.org] On Behalf Of Michael Bu
Sent: December-01-10 2:16 PM
To: varnish-misc at varnish-cache.org
Subject: client.identity and client director -- How?

 

Hi All,


I want to know how to setup a client director and make use of client.identity to force the request always going to the same backend instance (ie. sticky).

Here's my setup:

backend a {
  .host = "192.168.1.4";
  .port = "8880";
}
backend b {
  .host = "192.168.1.5";
  .port = "8880";
}
director tomcat client {
    {
        .backend = a;
        .weight = 1;
    }
    {
        .backend = b;
        .weight = 1;
    }
}
sub vcl_recv {
    ## set sticky bit for backend director ##
    set client.identity = regsub(req.http.Cookie, ".*JSESSIONID=.*\.(\w).*", "\1");
    set req.backend = tomcat;
}

Unfortunately the above setup didn't work as expected.

Could some one please give me some advice?

Thanks in advance!
Michael

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