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<p class="MsoNormal">Hi Szilard,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The logs being written in <span style="color:black">/var/log/linecard.log are the ones coming from the ‘syslog(ip(10.20.30.40) transport("udp") port(514) keep-alive(no));’ source.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Because log messages received in syslog() source, have always local4 facility.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">I am sending you in attachment the write_with_rotation.sh script.<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Alex<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> syslog-ng <syslog-ng-bounces@lists.balabit.hu> <b>
On Behalf Of </b>Szilard Parrag (sparrag)<br>
<b>Sent:</b> 5 de maio de 2022 07:32<br>
<b>To:</b> syslog-ng@lists.balabit.hu<br>
<b>Subject:</b> Re: [syslog-ng] Local sources seem not to be working<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal" 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.<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span class="xelementtoproof"><span style="font-size:12.0pt;color:black">Hi Alex,</span></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">After checking the stats, you have sent we can see that there had been some writes:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">from<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Courier New";color:black;background:white">dst.program;d_localfile_linecard#0;/opt/machine/local/bin/write_with_rotation.sh /var/log/linecard.log 10 10;a;</span><b><span style="font-size:12.0pt;font-family:"Courier New";color:#FF5454;background:white">written</span></b><span style="font-size:12.0pt;font-family:"Courier New";color:black;background:white">;4518</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">to<o:p></o:p></span></p>
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<pre><span style="color:black">dst.program;d_localfile_linecard#0;/opt/machine/local/bin/write_with_rotation.sh /var/log/linecard.log 10 10;a;written;4549<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol;color:black"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="color:black">we do not see increase in the counters of /var/log destinatons, but only on one destination<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol;color:black"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="color:black">we could <span style="background:white">only </span>see an increase in syslog-udp processed counters<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol;color:black"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman""> </span></span></span><![endif]><span style="color:black">there are no dropped/queued counters<o:p></o:p></span></pre>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">We would guess this could be due to flow-control, but for that we would need to see non-zero queued counter values, which is not the case. It could happen that one destination hangs/can't send
messages out, which leads to suspended sources due to flow-control, but the syslog() source is not affected since it doesn't send messages to the hanged destination(s).
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Based on the stats, only "d_localfile_linecard" is active (~30 messages in 15 minutes), maybe the syslog() source would be affected too without the filtering.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">We should see more internal logs, which is problematic, since internal() source seems to be stopped too. For that I would recommend extracting internal() source from the s_src statement and putting
it in a separate log path with a simple file destination.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Also, if possible, could you please share your `write_with_rotation.sh` script? It is unlikely that it interferes with syslog-ng, but a double check would be nice. </span><span style="font-size:12.0pt;font-family:"Segoe UI Emoji",sans-serif;color:black">🙂</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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