nginx on high load (upstream prematurely closed connection while reading response header from upstream)

[Francis Daly]

On Thu, May 19, 2016 at 04:31:14AM -0400, muzi wrote:

Hi there,

> upstream is php-fpm server
> (127.0.0.1) and its also setup to handle huge load, during above errors, i
> see the site is opening fine. but don't know where to catch it. PM is also
> set on demand and maximum childerns set to 90000 to handle the load, and no
> logs appears in php-fpm. Can you please suggest how to got the issue ?

nginx says that upstream is doing something odd.

upstream is php-fpm.

I suggest checking the php-fpm docs to see how to get it to log what
it is doing -- if it says nginx is doing something odd, then there is
a conflict to investigate. Otherwise, it should says something about the
connections that it is closing.

If the site is opening fine, maybe there is no problem to worry about.

	f
-- 
Francis Daly        francis at daoine.org