<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<div class="moz-cite-prefix">Sébastien,</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">The message about the signal process is
only the beginning of the process.</div>
<div class="moz-cite-prefix">You are interested in messages like the
following:<br>
<br>
<span style="font-family:monospace">
<blockquote type="cite"><span style="font-family:monospace"><span
style="color:#000000;background-color:#ffffff;">2024/03/26
13:36:36 [notice] 723#723: signal 1 (SIGHUP) received from
69064, reconfiguring </span><br>
2024/03/26 13:36:36 [notice] 723#723: reconfiguring <br>
2024/03/26 13:36:36 [notice] 723#723: using the "epoll"
event method <br>
2024/03/26 13:36:36 [notice] 723#723: start worker processes
<br>
2024/03/26 13:36:36 [notice] 723#723: start worker process
69065 <br>
2024/03/26 13:36:36 [notice] 723#723: start worker process
69066 <br>
2024/03/26 13:36:36 [notice] 723#723: start cache manager
process 69067 <br>
2024/03/26 13:36:36 [notice] 61903#61903: gracefully
shutting down <br>
2024/03/26 13:36:36 [notice] 61905#61905: exiting <br>
2024/03/26 13:36:36 [notice] 61903#61903: exiting <br>
2024/03/26 13:36:36 [notice] 61904#61904: gracefully
shutting down <br>
2024/03/26 13:36:36 [notice] 61904#61904: exiting <br>
2024/03/26 13:36:36 [notice] 61903#61903: exit</span></blockquote>
<br>
</span></div>
<div class="moz-cite-prefix">Note the 'gracefully shutting down' and
'exiting' message from workers. Also the 'start' and
'reconfiguring' messages from the master process.</div>
<div class="moz-cite-prefix">There should be a similar sequence
somewhere in your logs.</div>
<div class="moz-cite-prefix">Having these logs may help explaining
what happens on a reload.<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Kind regards,</div>
<div class="moz-cite-prefix">Igor.<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 26/03/2024 12:41, Sébastien Rebecchi
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CA+ts6nqerRddGEdE9USe9drTeh4YwnSxr4sLpL97wNZbPcTmZA@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Hi Igor
<div><br>
</div>
<div>There is no special logs on the IP_1 (the reloaded one)
side, only 1 log line, which is expected:</div>
<div>--- BEGIN ---<br>
</div>
<div>2024/03/26 13:37:55 [notice] 3928855#0: signal process
started<br>
</div>
<div>--- END ---<br>
</div>
<div><br>
</div>
<div>I did not configure worker_shutdown_timeout, it is
unlimited.</div>
<div><br>
</div>
<div>Sébastien.</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">Le lun. 25 mars 2024 à 17:59,
Igor Ippolitov <<a href="mailto:iippolitov@nginx.com"
moz-do-not-send="true" class="moz-txt-link-freetext">iippolitov@nginx.com</a>>
a écrit :<br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<div>Sébastien,</div>
<div><br>
</div>
<div>Nginx should keep active connections open and wait for
a request to complete before closing.<br>
</div>
<div>A reload starts a new set of workers while old workers
wait for old connections to shut down.</div>
<div>The only exception I'm aware of is having
worker_shutdown_timeout configured: in this case a worker
will wait till this timeout and forcibly close a
connection. Be default there is no timeout.<br>
</div>
<div><br>
</div>
<div>It would be curious to see error log of nginx at IP_1
(the reloaded one) while the reload happens. It may
explain the reason for connection resets.<br>
</div>
<div><br>
</div>
<div>Kind regards,</div>
<div>Igor.<br>
</div>
<div><br>
</div>
<div>On 25/03/2024 12:31, Sébastien Rebecchi wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div style="padding:0px 0px 0px 2px">
<div
style="color:rgb(0,0,0);font-family:monospace;font-size:10pt">
<p style="margin:0px">Hello</p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px">I have an issue with <span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">nginx</span>
closing prematurely connections when reload is
performed.</p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px">I have some <span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">nginx</span>
servers configured to proxy_pass requests to an
upstream group. This group itself is composed of
several servers which are <span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">nginx</span>
themselves, and is configured to use <span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">keepalive</span>
connections.</p>
<p style="margin:0px">When I trigger a reload (-s
reload) on an <span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">nginx</span>
of one of the servers which is target of the
upstream, I see in error logs of all servers in
front that connection was reset by the <span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">nginx</span>
which was reloaded.</p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px">Here configuration of upstream
group (IPs are hidden replaced by IP_X):</p>
<p style="margin:0px">--- BEGIN ---</p>
<p style="margin:0px">upstream data_api {</p>
<p style="margin:0px"> random;</p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px"> server IP_1:80 max_fails=3
fail_timeout=30s;</p>
<p style="margin:0px"> server IP_2:80 max_fails=3
fail_timeout=30s;</p>
<p style="margin:0px"> server IP_3:80 max_fails=3
fail_timeout=30s;</p>
<p style="margin:0px"> server IP_4:80 max_fails=3
fail_timeout=30s;</p>
<p style="margin:0px"> server IP_5:80 max_fails=3
fail_timeout=30s;</p>
<p style="margin:0px"> server IP_6:80 max_fails=3
fail_timeout=30s;</p>
<p style="margin:0px"> server IP_7:80 max_fails=3
fail_timeout=30s;</p>
<p style="margin:0px"> server IP_8:80 max_fails=3
fail_timeout=30s;</p>
<p style="margin:0px"> server IP_9:80 max_fails=3
fail_timeout=30s;</p>
<p style="margin:0px"> server IP_10:80 max_fails=3
fail_timeout=30s;</p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px"> <span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">keepalive</span>
20;</p>
<p style="margin:0px">}</p>
<p style="margin:0px">--- END ---</p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px">Here configuration of the
location using this upstream:</p>
<p style="margin:0px">--- BEGIN ---</p>
<p style="margin:0px">location / {</p>
<p style="margin:0px"> proxy_pass <a
href="http://data_api" target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">http://data_api</a>;</p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px"> proxy_http_version 1.1;</p>
<p style="margin:0px"> proxy_set_header Connection
"";</p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px"> proxy_set_header Host $host;</p>
<p style="margin:0px"> proxy_set_header X-Real-IP
$real_ip;</p>
<p style="margin:0px"> proxy_set_header
X-Forwarded-For $proxy_add_x_forwarded_for;</p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px"> proxy_connect_timeout 2s;</p>
<p style="margin:0px"> proxy_send_timeout 6s;</p>
<p style="margin:0px"> proxy_read_timeout 10s;</p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px"> proxy_next_upstream error
timeout <span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">http</span>_502
<span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">http</span>_504;</p>
<p style="margin:0px">}</p>
<p style="margin:0px">--- END ---</p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px">And here the kind of error
messages I get when I reload <span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">nginx</span>
of "IP_1":</p>
<p style="margin:0px">--- BEGIN ---</p>
<p style="margin:0px">2024/03/25 11:24:25 [error]
3758170#0: *1795895162 <span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">recv</span>()
failed (104: Connection reset by peer) while
reading response header from upstream, client:
CLIENT_IP_HIDDEN, server: SERVER_HIDDEN, request:
"POST /REQUEST_LOCATION_HIDDEN HTTP/2.0",
upstream: "<a
href="http://IP_1:80/REQUEST_LOCATION_HIDDEN"
target="_blank" moz-do-not-send="true">http://IP_1:80/REQUEST_LOCATION_HIDDEN</a>",
host: "HOST_HIDDEN", referrer: "REFERRER_HIDDEN"</p>
<p style="margin:0px">--- END ---</p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px">I thought -s reload was doing
graceful shutdown of connections. Is it due to the
fact that <span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">nginx</span>
can not handle that when using <span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">keepalive</span>
connections? Is it a bug?</p>
<p style="margin:0px">I am using <span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">nginx</span>
1.24.0 everywhere, no particular </p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px">Thank you for any help.</p>
<p style="margin:0px"><br>
</p>
<p style="margin:0px"><span
style="text-decoration-line:underline;text-decoration-style:wavy;text-decoration-color:rgb(255,128,64)">Sébastien</span></p>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
<pre>_______________________________________________
nginx mailing list
<a href="mailto:nginx@nginx.org" target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">nginx@nginx.org</a>
<a href="https://mailman.nginx.org/mailman/listinfo/nginx"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://mailman.nginx.org/mailman/listinfo/nginx</a>
</pre>
</blockquote>
<p><br>
</p>
</div>
</blockquote>
</div>
</blockquote>
<p><br>
</p>
</body>
</html>