Is there a way to invalidate a cached item on multiple varnish servers at once?

[Paul Krischer]

Hi James,

I wrote the Purge module for Drupal. ( http://drupal.org/project/purge )
and the "stable" 1.x branch allows you to enter multiple proxy addresses,
separated by spaces. like: "http://10.0.1.10 http://10.0.1.11". This will
fire off all purge requests to both of the servers as a single burst of
http requests (using curl_multi), preserving your sites domain name.

Admittingly thte current state of the module isn't that great but I expect
to work on it some more on it soon.

Paul Krischer
"SqyD"


On Tue, Oct 1, 2013 at 9:40 AM, Rainer Duffner <rainer at ultra-secure.de>wrote:

> Am Mon, 30 Sep 2013 13:44:34 -0700
> schrieb James Pearson <james at ifixit.com>:
>
> > Excerpts from Rainer Duffner's message of 2013-09-29 13:45:51 -0700:
> > > Hi,
> > >
> > > suppose you've got a couple of load-balanced varnish-servers, is
> > > there a way to have an item removed from the cache on multiple
> > > servers at the same time?
> >
> > How small of a window do you need?  I'd probably just fire off a
> > PURGE request to each server, but that'd give a few seconds where
> > some servers would have a cache entry and others would not.
>
> It's not a question of a certain time-window.
> More a question of transparency.
> E.g. in Drupal, you can only enter a single IP.
>
> It's unreasonable to assume a user would be able to issue a purge on a
> 2nd (or 3rd) server himself - as he may not know the IPs of these
> servers anyway.
>
>
>
>
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