I wrote a module for nginx 4 years ago which limited the number of
connections to upstream in order that the upstream servers would not be too
busy to work efficiently. Now I think this module is stable, and expect it
to be merged into nginx official if possible.

the code is here:
*https://github.com/cfsego/nginx-limit-upstream
https://github.com/cfsego/nginx-limit-upstream*

sincerely
_______________________________________________
nginx mailing list
nginx@nginx.org
http://mailman.nginx.org/mailman/listinfo/nginx