Bypass Cache for Particular Visitor IP Address

[Stephen Wood]

How do the logs describe the request? Hit/Miss/Pass? How are you sure that
the content is being served out of the cache?

Also, you might want to consider using
ipcast<https://github.com/lkarsten/libvmod-ipcast>to set the client.ip
from the x-forwarded-for headers. It's a lot cleaner
than using the inline C. We use it to do what you're describing.


On Thu, Sep 12, 2013 at 12:12 PM, iPhrankie <iphrankie at gmail.com> wrote:

> Hello Everyone,
>
> We're using Varnish 3.0.3 behind a load balancer. We would like to bypass
> the Varnish cache for a particular visitor IP address.
>
> After doing research, I found the following solution. We’re using the
> following in order for the acl to match the "http.x-forwarded-for" string.
> This code is working and within varnishlog I see “6 VCL_acl c MATCH
> passem 7x.xxx.xxx.xxx”. However, even though it is matching the acl, the
> cache is still not being bypassed.
>
> I have a feeling it has to do with the “sub vcl_recv” or the “return
> (pass)”. I also tried using “set req.hash_always_miss = true;” instead of
> “return (pass)”, but this also didn’t work.
>
> I would really greatly appreciate the help getting this to work. Many
> thanks.
>
>
>     C{
>
>     #include <netinet/in.h>
>
>     #include <string.h>
>
>     #include <sys/socket.h>
>
>     #include <arpa/inet.h>
>
>     }C
>
>     acl passem { "7x.xxx.xxx.xxx"; }
>
>     sub vcl_recv {
>
>     C{
>
>     struct sockaddr_storage *client_ip_ss = VRT_r_client_ip(sp);
>
>     struct sockaddr_in *client_ip_si = (struct sockaddr_in *)
> client_ip_ss;
>
>     struct in_addr *client_ip_ia = &(client_ip_si->sin_addr);
>
>     char *xff_ip = VRT_GetHdr(sp, HDR_REQ, "\020X-Forwarded-For:");
>
>
>
>     if (xff_ip != NULL) {
>
>     inet_pton(AF_INET, xff_ip, client_ip_ia);
>
>     }
>
>     }C
>
>     if (!(client.ip ~ passem)) {
>
>     return (pass);
>
>             }
>
>     }
>
>
>
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>



-- 
Stephen Wood
www.heystephenwood.com
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