<div dir="ltr"><div>Hi,</div><div><br></div><div>Just an idea - do we have enough logs on the server to see the requests history by date? If so, one can identify if there was a spike of the requests after a particular set of dates (which can in turn give us a hint about which release might contain a bug that's making more calls than expected). Of course this is not useful if it's apparent that the request count increased gradually instead of a spike.</div><div><br></div><div>Shantanu<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, 23 Sept 2021 at 22:13, Nicolás Alvarez <<a href="mailto:nicolas.alvarez@gmail.com">nicolas.alvarez@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">El jue, 23 de sep. de 2021 a la(s) 08:55, Aleix Pol (<a href="mailto:aleixpol@kde.org" target="_blank">aleixpol@kde.org</a>) escribió:<br>
><br>
> On Thu, Sep 23, 2021 at 11:52 AM Ben Cooksley <<a href="mailto:bcooksley@kde.org" target="_blank">bcooksley@kde.org</a>> wrote:<br>
> ><br>
> > Hi all,<br>
> ><br>
> > It has recently come to our attention that the number of queries being handled for the endpoint <a href="https://autoconfig.kde.org/ocs/providers.xml" rel="noreferrer" target="_blank">https://autoconfig.kde.org/ocs/providers.xml</a> on a day to day basis has gotten to the point where it is causing issues with server responsiveness to other traffic. This is perhaps best summarised by the following:<br>
> ><br>
> > root@nicoda /var/log/apache2 # ls -lah ...<br>
> > -rw-r----- 1 root adm 458M Sep 23 06:25 autoconfig.kde.org.log.1<br>
> > -rw-r----- 1 root adm 381M Sep 23 06:25 networkcheck.kde.org.log.1<br>
> > -rw-r----- 1 root adm 143M Sep 23 06:25 www.kde.org.log.1<br>
> ><br>
> > root@nicoda /var/log/apache2 # cat autoconfig.kde.org.log.1 | wc -l<br>
> > 4,222,343<br>
> ><br>
> > Based on those numbers we're looking at 48-49 requests per second (on average - peaks are much higher by many magnitudes), which seems extremely excessive given that this file is only supposed to be retrieved by KDE software when GHNS functionality is triggered. That is supported by the substantial size difference it has over <a href="http://networkcheck.kde.org" rel="noreferrer" target="_blank">networkcheck.kde.org</a> - which is used by plasma-nm and NetworkManager (on Neon) to check for whether they have a working internet connection - which i'd expect to be the site receiving the most traffic.<br>
> ><br>
> > As such, I therefore suspect we have bug(s) in software that makes use of GHNS functionality.<br>
> ><br>
> > It would therefore be appreciated if we could please review the software in question to determine whether it is operating correctly. Given that it usually runs in the background on user systems, i'd especially appreciate it if a detailed review could be conducted on Discover and other software that conducts package management operations or assists in managing updates.<br>
> ><br>
> > Unfortunately all these applications submit a fairly useless user agent (Mozilla/5.0) so it is impossible for Sysadmin to ascertain any further information. If we could get information on the software that is originating the request added to the user agent to assist in investigating these issues in the future that would be extremely helpful.<br>
> ><br>
> > Thanks,<br>
> > Ben<br>
><br>
> That's correct. Discover fetches them at startup. It's necessary to be<br>
> able to check if there are updates on KNS-provided resources.<br>
><br>
> Incidentally, I was looking into this yesterday incidentally. We<br>
> could see if caching is broken somehow. A request will still be needed<br>
> though to check if the cache is out of date.<br>
<br>
Caching seems to be working, since the vast majority of the requests<br>
are returning 304 Not Modified.<br>
<br>
However in *many* cases I see a single IP making multiple requests in<br>
the same second, and doing it again the next minute. Here's one IP<br>
address picked randomly:<br>
<br>
[22/Sep/2021:06:25:41 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:25:41 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:25:41 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:25:41 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:27:57 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:27:58 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:27:58 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:28:32 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:28:32 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:28:32 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:28:32 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:28:59 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:28:59 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:28:59 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:28:59 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:30:11 +0000] "GET /ocs/providers.xml HTTP/1.1" 200<br>
[22/Sep/2021:06:30:11 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:30:11 +0000] "GET /ocs/providers.xml HTTP/1.1" 200<br>
[22/Sep/2021:06:30:38 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:30:38 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:30:38 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:30:38 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:31:19 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:31:19 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:31:19 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:31:19 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:31:38 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:31:38 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:31:38 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
[22/Sep/2021:06:31:38 +0000] "GET /ocs/providers.xml HTTP/1.1" 304<br>
<br>
This continues for hours. And it's not an isolated case; again, the IP<br>
I searched for was a random one from the log.<br>
<br>
There are 120 IP addresses that *each* made more than 10,000 requests<br>
in a 24h period.<br>
<br>
I tried a few GHNS things on my own system and I couldn't reproduce it...<br>
<br>
-- <br>
Nicolás<br>
</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr">Shantanu Tushar<br><a href="http://shantanu.io" target="_blank">shantanu.io</a></div></div>