On Sun, Nov 15, 2015 at 1:21 AM, SL <bgs...@gmail.com> wrote:

> Hi,
>
> We have quite a large number of backends, and are selecting which back end
> to use based on the host specified in the request.  (Note these are not
> loadbalanced, we have to target them individually).
>
> Currently we are doing this with ACLs, e.g. for each:
>
>     acl svr1_request hdr_beg(host) -i svr1
>
> then:
>
>     use_backend svr1 if svr1_request
>
> (An example request host in this case would be svr1.example.com)
>
> Using ACLs like this means that we have a large number of repeated ACLs
> and use_backends.  It's a bit cumbersome, difficult to maintain, and I
> suspect not very efficient.
>
> Is there a better way to do this?  What would be ideal, is some way to
> take the subdomain of the request host, and simply select a backend whose
> name matched, but I don't know of any way to do that.  Is such a thing
> possible?
>
> Thank you
>
> S
>
>
http://blog.haproxy.com/2015/01/26/web-application-name-to-backend-mapping-in-haproxy/

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