Hello!

On Fri, Dec 01, 2017 at 06:43:36AM -0800, Gary wrote:

> Is this limiting for one connection or rate limiting for the
> entire server? I interpret this as a limit for one connection.

The request limiting can be configured in multiple ways. It is
typically configured using $binary_remote_addr variable as a key
(see http://nginx.org/r/limit_req_zone), and hence the limit is
per IP address. The particular configuration uses

: limit_req_zone "all" zone=all:100m rate=2000r/s;

That is, the limit is applied for the "all" key - a static string
without any variables. This means that all requests (where
limit_req with the zone in question applies) will share the same
limit.

--
Maxim Dounin
http://mdounin.ru/
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