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<p>Hi,</p>
<p>Thanks for this information.</p>
<p>I had my monitoring active during the last incident.</p>
<p>It shows that the CPU was growing up during 20 minutes
approximately (from 20% to 100%). In the same time I can see
physical RAM usage growing up (from 30% to 60%), disk I/O were
stable, far from critical levels, network traffic began to grow up
when the CPU reached 100%. I'm in a private cloud, we are not
limited neither in RAM I/O nor in HDD I/O. So I still don't
understand how can I improve the situation.</p>
<p>Best regards,</p>
<p>Peter</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 22/05/2019 21:10, Travis Warlick via
unit wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAKbKY0EXqO_tMy25mqhPnZqpEXJuFGt_AtwG2DtMP1K299R-TA@mail.gmail.com">
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<div dir="ltr">
<div dir="ltr">I am seeing the same log entries and have
experienced a very similar consumption problem about once a
month. At the onset of the problem, there is a short spike in
CPU usage, then the CPU usage goes to nearly 0, but the
load-average stays near 2x the number of VCPUs. After about
20~30 minutes, the server becomes completely unresponsive, and
I'm forced to reboot via the AWS console. Some painfully
obtained observations indicated that all available network and
file resources were being consumed at this point. After a
couple occurrences, I noticed in AWS CloudWatch metrics that
the EFS volume (Elastic File System, i.e. basically NFS)
spiked to 100% throughput at nearly the same time as the short
spike in CPU usage and stayed there. My solution was to
increase the volume's provisioned throughput to 10 Mbps, and I
have not experienced the issue since, although I am still
seeing the log entries you mention. My conclusion is that
nginx unit was consuming massive amounts of network and file
system resources and "choking" the server. This is obviously
not a long-term solution, though, as there's no reason for
such a massive amount of EFS volume throughput for a Wordpress
application.
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<p style="font-size:12.8px"><font size="1"
face="arial, helvetica, sans-serif"
color="#000000"><b><br>
Travis Warlick</b><br>
<b>Manager, Development Operations</b><br>
</font></p>
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<div dir="ltr" class="gmail_attr">On Wed, May 22, 2019 at
11:01 AM Peter TKATCHENKO <<a href="mailto:peter@bimp.fr"
moz-do-not-send="true">peter@bimp.fr</a>> wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p>Hello,</p>
<p>I'm using Unit to publish a PHP application
(NextCloud). I am on FreeBSD 11.2 (jailed), I use PHP
7.2 from packages. There is an NGINX server as
front-end.<br>
</p>
<p>When I check Unit logs I see many records like this:</p>
<p><font size="-1"><tt>2019/05/16 12:44:39 [info]
88085#101952 *73260 shutdown(177, 2) failed (57:
Socket is not connected)</tt></font><br>
</p>
<p>And sometimes like this:</p>
<p><font size="-1"><tt>2019/05/16 12:53:39 [alert]
88085#101951 *74551 socket close(177) failed (54:
Connection reset by peer)</tt></font><br>
</p>
<p>The application seems to work correctly, but I would
like to understand the cause of these errors, probably I
need to tune something?</p>
<p>Another problem is more important. Sometimes (once a
week) 'unit: router' process begins to consume 100% of 4
VCPU (!!), it takes about 15 minutes to grow the CPU
usage, and finish by blocking completely the application
('bad gateway' error on nginx). Restart of unitd service
solves the problem. I see many errors of the first type
in logs at this moment, but nothing more interesting.<br>
</p>
<p>Best regards,</p>
Peter TKATCHENKO </div>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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