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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
Hi,</div>
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<br>
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Sorry for not replying earlier.<br>
Thanks for the stats output, I've checked it.<br>
It looks like messages were dropped, almost 100k messages.<br>
dst.unix-stream;d_mgmt_vrf_socket#0;unix-stream,localhost.afunix:/dev/uds_log;a;dropped;95102
<div>dst.unix-stream;d_mgmt_vrf_socket#0;unix-stream,localhost.afunix:/dev/uds_log;a;processed;3868284</div>
<div>dst.unix-stream;d_mgmt_vrf_socket#0;unix-stream,localhost.afunix:/dev/uds_log;a;queued;0</div>
dst.unix-stream;d_mgmt_vrf_socket#0;unix-stream,localhost.afunix:/dev/uds_log;a;written;3777905<br>
</div>
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<br>
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
I think what's even more troubling is that the other syslog-ng instance that's sending to Grafana dropped 2,2M messages:<br>
dst.syslog;d_grafana_tcp#0;tcp,10.100.71.73:1514;a;dropped;2219335
<div>dst.syslog;d_grafana_tcp#0;tcp,10.100.71.73:1514;a;processed;4090485</div>
<div>dst.syslog;d_grafana_tcp#0;tcp,10.100.71.73:1514;a;queued;3753</div>
<div>dst.syslog;d_grafana_tcp#0;tcp,10.100.71.73:1514;a;suppressed;24682</div>
dst.syslog;d_grafana_tcp#0;tcp,10.100.71.73:1514;a;written;1874813<br>
</div>
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<br>
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
I've tried reproducing the issue, I've placed the disk-buffer files on a tmpfs filesystem (with limited size, so I can test what happens if the disk becomes full).<br>
I was unable to reproduce the issue. For me, both the system() and internal() sources were continuing to read new messages, but since the disk-buffer is full, the messages were dropped.<br>
I've asked for some help from the team, as I have got other priorities now, so someone else will be looking into this deeper.</div>
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<br>
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I think we could narrow down the issue once we have reproduction steps, but I know this is not easy.</div>
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<br>
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The biggest mistery for me is still, how could the syslog() UDP!!! source forward messages () when system() and internal() doesn't.<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
The second is how could messages go out from d_mgmg_vrf_socket if the destination is full? Maybe this isn't what is happening, so let's clear out what is really happening when "local sources doesn't work".</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
>From an earlier mail:<br>
> You're saying that the syslog() source in s_src is receiving message, while the internal() and system() doesn't?
<div>> [Alexandre Santos] Yes, I think that it is what is happening. Logs from syslog() source are being written to the /var/logs/..., while journald logs are not.</div>
<br>
<b>The issue is that there are no messages from system() and internal() in the /var/log/... output files, right?</b><br>
So I can assume that no messages from syslog() source go out on the d_mgmt_vrf_socket() destination when the issue happens?</div>
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<br>
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<br>
<b>Suggestions</b>:<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
<ol>
<li><span>An important thing to emphasize is that your config clearly shows that the disk-buffer is
<b></b><b><b>extremely small</b></b>, especially without flow-control!!!!!<br>
</span>I strongly recommend adjusting it's size from 4MB to t least a 1GB size!!!!<br>
(It's a different question that storing a disk-buffer on a tmpfs filesystem (which is RAM based) is not really persistent, but that can be okay as long as the system runs; it's a step better than using only in-memory queue in syslog-ng)<br>
<br>
</li><li>You could lower the value of the reconnect timeout from the default 60 seconds to 10 seconds (just a guess), so it will be a lower window of time when messages have to be queued.<br>
</li></ol>
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<br>
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);">
Regards,<br>
Gabor<br>
<br>
<br>
Gabor</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Alexandre Santos <ASantos@infinera.com><br>
<b>Sent:</b> Thursday, April 21, 2022 15:22<br>
<b>To:</b> Gabor Nagy (gnagy) <Gabor.Nagy@oneidentity.com>; Syslog-ng users' and developers' mailing list <syslog-ng@lists.balabit.hu><br>
<b>Subject:</b> RE: Local sources seem not to be working</font>
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<p class="x_MsoNormal"><span style="color:#7030A0">Hi Gabor,</span></p>
<p class="x_MsoNormal"><span style="color:#7030A0"> </span></p>
<p class="x_MsoNormal"><span style="color:#7030A0">The problem was reproduced again.</span></p>
<p class="x_MsoNormal"><span style="color:#7030A0">I was able to get the stats in the error situation:
<b>54146.stats.error.txt</b></span></p>
<p class="x_MsoNormal"><span style="color:#7030A0"> </span></p>
<p class="x_MsoNormal"><span style="color:#7030A0">I also took the stats after reloading the configuration (which fixes the problem): 54146.stats.after.txt</span></p>
<p class="x_MsoNormal"><span style="color:#7030A0"> </span></p>
<p class="x_MsoNormal"><span style="color:#7030A0">Regarding your question: </span>
Just a random question: is /tmp a tmpfs filesystem?<span style="color:#7030A0"></span></p>
<p class="x_MsoNormal"><span style="color:#7030A0">Yes it is.</span></p>
<p class="x_MsoNormal"><span style="color:#7030A0"> </span></p>
<p class="x_MsoNormal"><span style="color:#7030A0">Let me know what you found out.</span></p>
<p class="x_MsoNormal"><span style="color:#7030A0"> </span></p>
<p class="x_MsoNormal"><span style="color:#7030A0">Thanks and regards,</span></p>
<p class="x_MsoNormal"><span style="color:#7030A0">Alex</span><span style="color:#7030A0"></span></p>
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<p class="x_MsoNormal"><b>From:</b> Gabor Nagy (gnagy) <Gabor.Nagy@oneidentity.com>
<br>
<b>Sent:</b> 31 de março de 2022 11:14<br>
<b>To:</b> Alexandre Santos <ASantos@infinera.com>; Syslog-ng users' and developers' mailing list <syslog-ng@lists.balabit.hu><br>
<b>Subject:</b> Re: Local sources seem not to be working</p>
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<div>
<p class="x_MsoNormal"><span style="color:black">Thanks for the config! I'll continue experimenting on my ideas<br>
<br>
You could either configure syslog-ng-ctl stats to talk to a given syslog-ng instance with the --control option pointing to the control-socket e.g. as above /var/lib/syslog-ng/mgmt-syslog-ng.ctl,</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="color:black">OR use the syslog-ng-ctl instance under the 2<sup>nd</sup> syslog-ng installation path.<br>
<br>
Just a random question: is /tmp a tmpfs filesystem?</span></p>
</div>
<div>
<p class="x_MsoNormal"><span style="color:black"> </span></p>
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<div>
<p class="x_MsoNormal"><span style="color:black">Gabor</span></p>
</div>
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<p class="x_MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> Alexandre Santos <<a href="mailto:ASantos@infinera.com">ASantos@infinera.com</a>><br>
<b>Sent:</b> Wednesday, March 30, 2022 17:07<br>
<b>To:</b> Gabor Nagy (gnagy) <<a href="mailto:Gabor.Nagy@oneidentity.com">Gabor.Nagy@oneidentity.com</a>>; Syslog-ng users' and developers' mailing list <<a href="mailto:syslog-ng@lists.balabit.hu">syslog-ng@lists.balabit.hu</a>><br>
<b>Subject:</b> RE: Local sources seem not to be working</span> </p>
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<p class="x_xmsonormal"><span style="color:#7030A0">Hi Gabor,</span></p>
<p class="x_xmsonormal"><span style="color:#7030A0"> </span></p>
<p class="x_xmsonormal"><span style="color:#7030A0">Thank you for you feedback.</span></p>
<p class="x_xmsonormal"><span style="color:#7030A0"> </span></p>
<p class="x_xmsonormal"><i><span style="color:black">Can you share the config, when the issue cannot be seen?</span></i></p>
<p class="x_xmsonormal"><span style="color:#7030A0">I am sending the configuration in attachment.</span></p>
<p class="x_xmsonormal"><span style="color:#7030A0"> </span></p>
<p class="x_xmsonormal"><i><span style="color:black">I would still like to see 2 "syslog-ng-ctl stats" outputs when the issue happens.</span></i></p>
<p class="x_xmsonormal"><span style="color:#7030A0">The issue is hard to reproduce, the next time the error is seen, I try to run it.</span></p>
<p class="x_xmsonormal"><span style="color:#7030A0">But how can I run syslog-ng-ctl stats for the 2<sup>nd</sup> syslog-ng instance?</span></p>
<p class="x_xmsonormal"><span style="font-size:8.0pt; font-family:Consolas; color:#7030A0">root@machine:/~# ps -ewfH | grep syslog-ng</span></p>
<p class="x_xmsonormal"><span style="font-size:8.0pt; font-family:Consolas; color:#7030A0">root 2582 1 0 09:06 ? 00:00:34 /usr/sbin/syslog-ng -F --caps cap_net_bind_service,cap_net_broadcast,cap_net_raw,cap_dac_read_search,cap_chown,cap_fowner=p
cap_dac_override,cap_syslog=ep</span></p>
<p class="x_xmsonormal"><span style="font-size:8.0pt; font-family:Consolas; color:#7030A0">root 4018 1 0 09:07 ? 00:00:00 /usr/sbin/syslog-ng -F --cfgfile=/etc/syslog-ng/mgmt-syslog-ng.conf --pidfile=/var/lib/syslog-ng/mgmt-syslog-ng.pid
--persist-file=/var/lib/syslog-ng/mgmt-syslog-ng.persist --control=/var/lib/syslog-ng/mgmt-syslog-ng.ctl</span></p>
<p class="x_xmsonormal"><span style="color:#7030A0">syslog-ng-ctl, seems to only show stats for job 2582.</span></p>
<p class="x_xmsonormal"><span style="color:#7030A0"> </span></p>
<p class="x_xmsonormal"><span style="color:#7030A0">Regards, Alex</span></p>
<p class="x_xmsonormal"><span style="color:#7030A0"> </span></p>
<p class="x_xmsonormal"> </p>
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<p class="x_xmsonormal"><b>From:</b> Gabor Nagy (gnagy) <<a href="mailto:Gabor.Nagy@oneidentity.com">Gabor.Nagy@oneidentity.com</a>>
<br>
<b>Sent:</b> 29 de março de 2022 12:48<br>
<b>To:</b> Alexandre Santos <<a href="mailto:ASantos@infinera.com">ASantos@infinera.com</a>>; Syslog-ng users' and developers' mailing list <<a href="mailto:syslog-ng@lists.balabit.hu">syslog-ng@lists.balabit.hu</a>><br>
<b>Subject:</b> Re: Local sources seem not to be working</p>
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<p class="x_xmsonormal"> </p>
<div>
<p class="x_xmsonormal"><span style="color:black">Hi Alex,</span></p>
</div>
<div>
<p class="x_xmsonormal"><span style="color:black"> </span></p>
</div>
<div>
<p class="x_xmsonormal"><span style="color:black">Using regular disk-buffer vs. using reliable disk-buffer shouldn't cause symptoms like that. It sounds like reliable(yes) would turn on a flow-control-like behaviour, which it doesn't.</span></p>
</div>
<div>
<p class="x_xmsonormal"><span style="color:black">(And as you said it only affects local sources).<br>
The main difference between the two kinds of disk-buffers is, that while reliable disk-buffer write every message to the disk-buffer, a normal disk-buffer has memory-only buffers for performance reasons (and flow-control reasons too).</span></p>
</div>
<div>
<p class="x_xmsonormal"><span style="color:black">You can still lose logs with a reliable disk-buffer if no flow-control is used: when the disk-buffer has reached it's maximum size and new messages keep arriving, then syslog-ng drops those messages.</span></p>
</div>
<div>
<p class="x_xmsonormal"><span style="color:black"> </span></p>
</div>
<div>
<p class="x_xmsonormal"><span style="color:black">We have more detailed documentation about disk-buffers in the admin guide, where you can see the structure of disk-buffers:<br>
<a href="https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.syslog-ng.com%2Ftechnical-documents%2Fdoc%2Fsyslog-ng-open-source-edition%2F3.36%2Fadministration-guide%2F61%23TOPIC-1768724&data=05%7C01%7CGabor.Nagy%40oneidentity.com%7C9c48f3192ab24fd1d7e308da2399febc%7C91c369b51c9e439c989c1867ec606603%7C0%7C1%7C637861441566677311%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000%7C%7C%7C&sdata=QdycH9%2FaR1MF5aqqNmbug5deq9NuGESAqk%2BZ9qd5Kuo%3D&reserved=0" originalsrc="https://www.syslog-ng.com/technical-documents/doc/syslog-ng-open-source-edition/3.36/administration-guide/61#TOPIC-1768724" shash="jBi3OtFUQQTO+sHvAhB2XfaIr+OIIJOnbJPUdjSxddrO9SnCbk85Bq1zGO/57kVL6r49yheEh2+EsKTgl1ccrfZ/eXBuQS7S001uNTJV8ISIf5Utw0BlDD9FpjhjzTPROk1TPjRZk3ev8n808ZVKdeZs9qr9zH/5Dz1nuuS3mec=">https://www.syslog-ng.com/technical-documents/doc/syslog-ng-open-source-edition/3.36/administration-guide/61#TOPIC-1768724</a></span></p>
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<div>
<p class="x_xmsonormal"><span style="color:black"> </span></p>
</div>
<div>
<p class="x_xmsonormal"><span style="color:black">Can you share the config, when the issue cannot be seen?</span></p>
</div>
<div>
<p class="x_xmsonormal"><span style="color:black">I would still like to see 2 "syslog-ng-ctl stats" outputs when the issue happens.</span></p>
</div>
<div>
<p class="x_xmsonormal"><span style="color:black"><br>
Regards,</span></p>
</div>
<div>
<p class="x_xmsonormal"><span style="color:black">Gabor</span></p>
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<p class="x_xmsonormal"><b><span style="color:black">From:</span></b><span style="color:black"> Alexandre Santos <<a href="mailto:ASantos@infinera.com">ASantos@infinera.com</a>><br>
<b>Sent:</b> Monday, March 28, 2022 13:45<br>
<b>To:</b> Gabor Nagy (gnagy) <<a href="mailto:Gabor.Nagy@oneidentity.com">Gabor.Nagy@oneidentity.com</a>>; Syslog-ng users' and developers' mailing list <<a href="mailto:syslog-ng@lists.balabit.hu">syslog-ng@lists.balabit.hu</a>><br>
<b>Subject:</b> RE: Local sources seem not to be working</span> </p>
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<p class="x_xmsonormal" style="line-height:12.0pt; background:#FFEB9C"><b><span style="font-size:10.0pt; color:#9C6500">CAUTION:</span></b><span style="font-size:10.0pt; color:black"> This email originated from outside of the organization. Do not follow guidance,
click links, or open attachments unless you recognize the sender and know the content is safe.</span></p>
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<p class="x_xmsonormal"> </p>
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<div>
<p class="x_xxmsonormal"><span style="color:#7030A0">Hi Gabor,</span></p>
<p class="x_xxmsonormal"><span style="color:#7030A0"> </span></p>
<p class="x_xxmsonormal"><span style="color:#7030A0">“<i>This is strange: the d_localfile destinations (<span style="background:white">as well as the vrf-socket destination "d_mgmt_vrf_socket"</span>) receive messages from the syslog() source, but not from
the internal() or system() sources?”</i></span></p>
<p class="x_xxmsonormal"><span style="color:#7030A0">Yes.</span></p>
<p class="x_xxmsonormal"><span style="color:#7030A0"> </span></p>
<p class="x_xxmsonormal"><i><span style="color:#7030A0">And the issue vanishes when "d_mgmt_vrf_socket" destination is removed?</span></i></p>
<p class="x_xxmsonormal"><span style="color:#7030A0">Yes.</span></p>
<p class="x_xxmsonormal"><span style="color:#7030A0"> </span></p>
<p class="x_xxmsonormal"><span style="color:#7030A0">I could not test the 2 last suggestions that you made.</span></p>
<p class="x_xxmsonormal"><span style="color:#7030A0"> </span></p>
<p class="x_xxmsonormal"><span style="color:#7030A0">We did however another test, which was to
<b>remove the reliable</b> option from d_mgmt_vrf_socket, and it seems the <b>problem is not seen again</b>.</span></p>
<p class="x_xxmsonormal"><span style="color:#7030A0"> </span></p>
<p class="x_xxmsonormal"><span style="color:#7030A0">Besides from what it is written in the manual, in other which cases/conditions can syslog-ng loose logs?</span></p>
<p class="x_xxmsonormal"><span style="color:#7030A0"> </span></p>
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<p class="x_xxmsonormal"><span style="color:#7030A0">reliable() </span></p>
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<p class="x_xxmsonormal"><span style="color:#7030A0">Type:</span></p>
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<p class="x_xxmsonormal"><span style="color:#7030A0">yes|no</span></p>
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<p class="x_xxmsonormal"><span style="color:#7030A0">Default:</span></p>
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<p class="x_xxmsonormal"><span style="color:#7030A0">no</span></p>
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<p class="x_xxmsonormal"><span style="color:#7030A0">Description: If set to yes, syslog-ng OSE cannot lose logs in case of reload/restart, unreachable destination or syslog-ng OSE crash. This solution provides a slower, but reliable disk-buffer option. It is
created and initialized at startup and gradually grows as new messages arrive. If set to no, the normal disk-buffer will be used. This provides a faster, but less reliable disk-buffer option.</span></p>
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<p class="x_xxmsonormal"><span style="color:#7030A0"> </span></p>
<p class="x_xxmsonormal"><span style="color:#7030A0">Thanks in advance,</span></p>
<p class="x_xxmsonormal"><span style="color:#7030A0">Alex</span></p>
<p class="x_xxmsonormal"> </p>
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<p class="x_xxmsonormal"><b>From:</b> Gabor Nagy (gnagy) <<a href="mailto:Gabor.Nagy@oneidentity.com">Gabor.Nagy@oneidentity.com</a>>
<br>
<b>Sent:</b> 25 de março de 2022 14:44<br>
<b>To:</b> Alexandre Santos <<a href="mailto:ASantos@infinera.com">ASantos@infinera.com</a>>; Syslog-ng users' and developers' mailing list <<a href="mailto:syslog-ng@lists.balabit.hu">syslog-ng@lists.balabit.hu</a>><br>
<b>Subject:</b> Re: Local sources seem not to be working</p>
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<p class="x_xxmsonormal" style="line-height:12.0pt; background:#FFEB9C"><b><span style="font-size:10.0pt; color:#9C6500">CAUTION:</span></b><span style="font-size:10.0pt; color:black"> This email originated from outside of the organization. Do not click links
or open attachments unless you recognize the sender and know the content is safe.</span></p>
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<p class="x_xxmsonormal"><span style="color:black">Hi Alex,</span></p>
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<p class="x_xxmsonormal"><span style="color:black"><br>
Sorry I haven't answered yet. I'll have a few ideas I would like to try out next week.</span></p>
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<p class="x_xxmsonormal"><span style="color:black"><br>
This is strange: the d_localfile destinations (<span style="background:white">as well as the vrf-socket destination "d_mgmt_vrf_socket"</span>) receive messages from the syslog() source, but not from the internal() or system() sources?</span></p>
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<p class="x_xxmsonormal"><span style="color:black">And the issue vanishes when "d_mgmt_vrf_socket" destination is removed?</span></p>
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<p class="x_xxmsonormal"><span style="color:black">If it would be soft flow-control, then the syslog() source would be suspended too.</span></p>
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<p class="x_xxmsonormal"><span style="color:black; background:white">Just a tip: would you switch out the unix-dgram() destination to syslog() destination, please? Maybe that's not possible with the VRF in-place...</span></p>
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<p class="x_xxmsonormal"><span style="color:black"><br>
In the stats output, do you see an increased number of dropped messages?</span></p>
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<p class="x_xxmsonormal"><span style="color:black"> </span></p>
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<p class="x_xxmsonormal"><span style="color:black">I would still suggest increasing the 4MB disk-buffer. You should make an estimation of how long could the mgmt syslog-ng be down (i.e not receiving from the unix-dgram), what is the average incoming EPS and
an average message size, that could give a hint about the required disk-buffer size.</span></p>
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<p class="x_xxmsonormal"><span style="color:black"><br>
Regards,</span></p>
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<p class="x_xxmsonormal" style="margin-bottom:12.0pt"><span style="color:black">Gabor</span></p>
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