Re: Apache route requests to two or more servers

[Robin Wood <robin () digininja org>]

On 13 July 2011 04:01, Nick Baronian <nbaronian () gmail com> wrote:
> If I understand what you are after correctly, I am sure some minor
> mangling could do this.  If you just want to duplicate all incoming
> webserver traffic, you could use iptables with the xtables tee to
> mirror your webserver's port(s) to another Apache server.  If you only
> want to mirror certain requests, I think you could achieve this by
> having Apache listen on multiple ports, redirect calls using
> mod_rewrite or whatever to the other listening webserver:port.  Have
> this redirection happening in conjunction with iptables/tee forwarding
> this other listening port out to your other Apache instance also.
>
> Depending on your needs, I would think you would want to block the
> responses from the second Apache server.  Chances are they would be
> dropped by the requesting host but the host would probably still
> receive them.  So depending on how silent you needed to be, I suggest
> dropping all outbound responses using iptables or whatever.
>
> If neither of these solutions work, perhaps fronting your Apache
> server with Squid in a reverse proxy configuration.  It has been years
> since I have played with it but I believe you can use Squid Redirector
> or something like SquidGuard to redirect all or specific requests out
> to multiple destinations.  But all this could be overkill and probably
> a big pain, maybe just using something simple like Ruby Webrick
> httpproxy.  Setup a listening service, forward/redirect and/or
> duplicating certain requests would probably work too.  Have Webrick
> forward requests to your primary Apache but also to your other Apache
> instances.

I like all those ideas, the Squid proxy is probably a bit of overkill
but I'll definitely have a look at iptables and using Webrick
httpproxy, sounds obvious when you mention it and I wrote a very basic
proxy for test I was doing the other day so I can see how simple it
would be.

Thanks

Robin


> Good luck,
> Nick
>
>
>
> On Tue, Jul 12, 2011 at 5:05 PM, Robin Wood <robin () digininja org> wrote:
> > Does anyone know if there is a way to get Apache to send a request to
> > multiple servers, possibly using something like mod_proxy, and specify
> > which one I want to take the response from.
> >
> > I'm thinking of something like a replication system, take this request
> > and send it to the main server and also to a second and third server
> > as a backup. This isn't a replication service, I'm just using this as
> > an example.
> >
> > Robin
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