Upstream performances: what if one node only ?

[Maxim Dounin]

Hello!

On Fri, Jun 27, 2014 at 03:53:24PM +0200, Nicolas Flinois wrote:

> Hi all,
> 
> I am wondering about the possible extra-cost of using a single-node 
> upstream into proxy_pass compared with  'proxy_pass host' directly.
> I need to automate application servers move, and find convenient to update 
> upstream definitions only (defined into dedicated files).
> 
> Solution1:
> 
> upstream upOne {
>     server somehost;
> }
> [..]
> proxy_pass upOne;
> 
> 
> Solution2:
> 
> proxy_pass somehost;
> 
> Is solution1 more time-consuming than solution2 at run-time ?

There is no difference.  Internally, proxy_pass with a hostname 
creates an implicit upstream{} with a single server, and uses it.

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