Locating connection reset issue / h2 vs http/1.1

[Guillaume Quintard]

Are you able to find some logs in varnishlog (-g session, filtering by
port) to see what varnish is doing?

-- 
Guillaume Quintard


On Thu, Jan 31, 2019 at 9:45 AM <info+varnish at shee.org> wrote:

> Am 31.01.2019 um 17:38 schrieb Guillaume Quintard <
> guillaume at varnish-software.com>:
> >
> > On Thu, Jan 31, 2019 at 6:22 AM <info+varnish at shee.org> wrote:
> >>
> >> I have following stack: hitch-1.5 - varnish-5.2.0 - httpd-2.2/2.4
> >>
> >> On a high traffic node I am observing a lot of "Socket error:
> Connection reset by peer" log entries coming from hitch.
> >>
> >> I am trying to locate the cause of the issue (hitch or varnish site).
> >>
> >> So far I can say; that disabling h2 on hitch the "Connection resets"
> doesn't appear anymore.
> >>
> >> Does this have to do with varnish-5.2.'s h2 implementation?
> >>
> >> Jan 30 19:02:37 srv-s01 hitch[4006]: ww.xx.yy.zz:59395 :0 10:11
> NPN/ALPN protocol: h2
> >> Jan 30 19:02:37 srv-s01 hitch[4006]: ww.xx.yy.zz:59395 :0 10:11 ssl end
> handshake
> >> Jan 30 19:02:37 srv-s01 hitch[4006]: ww.xx.yy.zz:59395 :42884 10:11
> backend connected
> >> Jan 30 19:02:39 srv-s01 hitch[4006]: {backend} Socket error: Connection
> reset by peer
> >> Jan 30 19:02:39 srv-s01 hitch[4006]: ww.xx.yy.zz:59395 :42884 10:11
> proxy shutdown req=SHUTDOWN_CLEAR
> >> Jan 30 19:02:39 srv-s01 hitch[4006]: {backend} Socket error: Broken pipe
> >> Jan 30 19:02:39 srv-s01 hitch[4006]: ww.xx.yy.zz:59395 :42884 10:11
> proxy shutdown req=SHUTDOWN_CLEAR
> >> Jan 30 19:02:39 srv-s01 hitch[4006]: ww.xx.yy.zz:59399 :0 10:11 proxy
> connect
> >
> > Have you activated h2 support in Varnish? (it's not on by default)
> >
>
> Sure, DAEMON_OPTS has -p feature=+http2 passed. The content is delivered
> via h2 (verified in browsers)
> but sometimes lot of assets (client view) produce ERR_CONNECTION_CLOSED
> errors in the browser and on
> server site the mentioned "connection reset by peer" log entries appears
> ...
>
> --
> Leon
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