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anonymous coward
Asked: 2010-12-23 21:43:54 +0800 CST

Varnish doesn't seem to be caching

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I've setup a Varnish cache mirror to sit in front of a file server, but it seems to be endlessly re-downloading data from my file server.

There's about 100GB of data in total, but so far Varnish has downloaded 800GB from my file server.

I'm using the default VCL file that comes with Varnish and the response headers for files served by the file server are similar to the following:

HTTP/1.1 200 OK
Cache-Control: max-age=290304000, public
Content-Type: image/jpeg
Expires: Wed, 29 Dec 2010 21:38:33 GMT
Server: Microsoft-IIS/7.0
E-Tag: "8b4723296ab697530768f18b1378b269"
Content-Disposition: inline; filename=image046.jpg;
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Thu, 23 Dec 2010 05:38:33 GMT
Content-Length: 100592

I'm starting varnishd with the following options:

varnish/sbin/varnishd -a 0.0.0.0:80 -f varnish/etc/varnish/default.vcl -s file,varnish/var/lib/varnish/varnish_storage.bin,100G
http cache varnish

1 Answers

  1. Best Answer
    sub vcl_recv {
    if (req.url ~ "\.(cur|gif|jpg|jpeg|swf|css|js|flv|mp3|mp4|pdf|ico|png)(\?.*|)$") {
      unset req.http.cookie;
      unset req.http.Accept-Encoding;
      unset req.http.Vary;
    }
}

    If your requests contain cookies, they will be passed to the backend by default. Removing the encoding and vary will normalize things a little more so that you don't need to maintain a few copies of your images in cache. Also, I think 100G might be a bit excessive for your backing store, you might consider something closer to the amount of RAM you have in the machine.

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