limit_conn_zone applied to Proxy_Pass (outgoing requests)

Valentin V. Bartenev vbart at
Fri Jul 4 09:19:41 UTC 2014

On Thursday 03 July 2014 21:51:44 aflexzor wrote:
> Hello!
> I have an nginx reverse proxy it has a series of filters against DDoS
> attacks.
> As a last resort I need to make sure that I NEVER send more than x
> concurrent requests to the backend server (Proxy_pass)
> Is it possible to apply limit_conn_zone for outgoing requests? If so could
> i have an example? Thanks.

Look at the "max_conn" parameter of the "server" directive
in the "upstream" block:

Note that it's part of the commercial version of nginx.

  wbr, Valentin V. Bartenev

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