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Hi Jon,
Just my 2 cents - but I think Joshua has it right. If you're using
session management and weighted load balancing, then you must pass
the requests through your proxy - and hence your advantage of
geolocation is gone. If you're already using an external redirect,
then the proxy balancer has no way of knowing how many concurrent
connections worker is maintaining or how long they take or how much
bytes they serve (this would be needed for balancing purposes).
The only way I see it is to let mod_rewrite warp the browser to an
external url, e.g. from www.mysite.org to other domain names
(www.us.mysite.org, www.eu.mysite.org etc.) and then loose all
contact with the browser - which would mean to forget about sessions
and balancing.
Incidentally, if you have a good DNS provider or if you handle your
own DNS, then you could find a solution there - resolve
www.mysite.org depending on the requestor IP to a US-address, a EU-
address, and so on. An alternative approach, but I'm pretty sure that
this can work.
Hope this helps,
Karel
On Jun 18, 2007, at 10:53 PM, Jon Keys wrote:
Hey Joshua,
You're right except we don't use mod_proxy_balancer in conjunction
with mod_proxy ... we use mod_rewrite with '[R]' directive and
point to the mod_proxy_balancer worker to determine which server to
externally redirect to. Does this make sense?
The reason we chose to do this was to take advantage of some of the
nice features in mod_proxy_balancer (like session management,
weighted load balancing, etc...). We are, however, not locked in to
this solution. If something more efficient / easier to manage is
out there we are definitely open to suggestions.
Thanks for your reply,
Jon
> Date: Mon, 18 Jun 2007 16:10:50 -0400
> From: [EMAIL PROTECTED]
> To: users@httpd.apache.org
> Subject: Re: [EMAIL PROTECTED] Geolocation Question
>
> On 6/18/07, Jon Keys <[EMAIL PROTECTED]> wrote:
> >
> > Hi,
> >
> > I'm setting up some load balancing based on Apache with
mod_proxy_balancer
> > and I'd like to incorporate geolocation based on IP address
into the load
> > balancing algorithm.
> >
> > I know that IP's are not a reliable way of determining
location, but we
> > purchased a package from ip2location to try and be as accurate
as possible.
> > Even still, it's not perfect and that's OK because we are just
distributing
> > the load of some free downloads ... if someone gets redirected
to a server
> > that's not that close to them it won't be the end of the world.
> >
> > Anyway, does anyone know of such a patch / mod / plugin /
application
> > compatible with apache2? If not, some pointers on where to
begin developing
> > this would be greatly appreciated.
>
> Maybe I'm missing something, but this doesn't make any sense to me.
>
> If you are using mod_proxy_balancer, then all requests will go
through
> the apache proxy server. That means there is no benefit in
putting the
> back-end server close to the client. In fact, you want the back-end
> server close to the balancer.
>
> If you want the client to access stuff from a closer server, you
> should issue an external redirect. mod_rewrite would be a
standard way
> to access a database to do a conditional redirect.
>
> Joshua.
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