Trying to Understand Upstream Keepalive

[Maxim Dounin]

Hello!

On Tue, Oct 28, 2014 at 08:01:33PM -0400, newnovice wrote:

> Maxim, 
> 
> http://nginx.org/en/docs/http/ngx_http_upstream_module.html#keepalive
> 
> I would like to know what is the keepalive timeout for this connection pool?
> Is it static? 

As of now, there is no timeout on nginx side.  Connections are 
closed either by backends or if there isn't enough room in 
the cache.

> Also i want to understand - if there is a marriage between number of
> connections nginx gets vs how many it opens to upstream? 

This depends on how long it takes to process a request (as well as 
various other factors).  As long as backends are fast enough, one 
connection to upstream may be enough to handle tens or hundreds of 
client connections.

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