Nginx upstream zone

[Vishwas Bm]

Thanks for answering the query.


On Mon, 8 Aug, 2022, 17:04 Sergey Kandaurov, <pluknet at nginx.com> wrote:

>
> > On 8 Aug 2022, at 06:49, Sergey A. Osokin <osa at freebsd.org.ru> wrote:
> >
> > Hi,
> >
> > On Fri, Aug 05, 2022 at 07:40:35PM +0530, Vishwas Bm wrote:
> >>
> >> What is the use of zone in stream upstream
> >> http://nginx.org/en/docs/stream/ngx_stream_upstream_module.html#zone
> >
> > Since this is the part of the commercial subscription, I'd recommend
> > to contact NGINX Plus premium support team, please visit the following
> > page to get details, https://www.nginx.com/support/
>
> And also included in opensource nginx.
>
> >
> >> Does it have any impact on how loadbalancing happens when there are
> >> multiple worker process?
> >
> > No impact.
>
> Actually, enabling upstream zone moves internal peer state storage
> to shared memory, such that loadbalancing becomes consistent among
> worker processes.  This includes reusing SSL sessions to backends.
>
> >
> >> Also how is the size needs to be calculated ?
> >> Is 5m size sufficient for 10 worker process?
> >
> > That depends on the actual NGINX Plus configuration and other factors,
> > usually 64k is enough, but that number can be revisited with an extensive
> > testing in a lower environments.
> >
> > Thank you.
> >
>
> It's roughly 500 bytes per upstream server in a simple case.
> The exact numbers depend on nginx version and configuration.
> Also, currently upstream zone cannot be configured to be less
> than 8 page sizes.
>
> --
> Sergey Kandaurov
>
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