upstream keepalive connections for all servers or each server?

[Maxim Dounin]

Hello!

On Wed, May 10, 2017 at 05:40:55PM -0700, Robert Paprocki wrote:

> > It is the number of keepalive connections to be cached for the
> > whole upstream{} block, that is, all servers.
> 
> Can we clarify the behavior for upstreams with duplicate server directives?
> Consider the following
> 
> upstream foo {
>  server 1.2.3.4:80;
>  server 5.6.7.8:80;
> 
>  keepalive 32;
> }
> 
> upstream bar {
>  server 1.2.3.4:80;
>  server 5.6.7.8:80;
> 
>  keepalive 32;
> }
> 
> A max of 64 TCP connections will be kept open?

Yes, in such a configuration each upstream block will cache up to 
32 connections (per worker process).

-- 
Maxim Dounin
http://nginx.org/