In short, it provides unique socket identifier. * It would be simpler to identify connections and filter them out by $socket_cookie only. As an example could be a custom response header `X-Request: $socket_cookie:$request_id`, or just `X-Socket-Id: $socket_cookie`.
* Another example could be to use some other fancy stuff like load balancing (hashing) by $socket_cookie. At the moment at 000webhost.com we are using $request_id to identify requests for clients, but $socket_cookie would be helpful too. On Tue, Jul 11, 2017 at 6:20 PM, Maxim Dounin <mdou...@mdounin.ru> wrote: > Hello! > > On Fri, Jul 07, 2017 at 10:28:42PM +0300, Donatas Abraitis wrote: > >> this looks promising when new 4.12 kernel introduced SO_COOKIE socket >> option which is able to generate a cookie for the socket. >> >> More information and implementation is here: >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5daab9db7b65df87da26fd8cfa695fb9546a1ddb >> >> Waiting for comments. >> >> # HG changeset patch >> # User Donatas Abraitis <donatas.abrai...@gmail.com> >> # Date 1499424023 -10800 >> # Fri Jul 07 13:40:23 2017 +0300 >> # Node ID 55b401978df27f1a1ab4eee4e50615b7551e3c0b >> # Parent 70e65bf8dfd7a8d39aae8ac3a209d426e6947735 >> Add new `socket_cookie` variable >> >> This would be useful for tracking connections by cookie, not only by >> request_id as we have it right now. Related: >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5daab9db7b65df87da26fd8cfa695fb9546a1ddb > > It is not clear if such a variable is indeed beneficial, and how > it can be used. Shouldn't client's address with port be good > enough to identify a connection, at least in most practical cases? > > If you think it worth adding, please elaborate a bit more on how > it is expected to be used. > > Alternatively, consider providing a module which exposes the > variable, it should be trivial to implement. > > [...] > > -- > Maxim Dounin > http://nginx.org/ > _______________________________________________ > nginx-devel mailing list > nginx-devel@nginx.org > http://mailman.nginx.org/mailman/listinfo/nginx-devel -- Donatas _______________________________________________ nginx-devel mailing list nginx-devel@nginx.org http://mailman.nginx.org/mailman/listinfo/nginx-devel
