<div dir="auto">The elements in the log destination are processed in order. So you have to insert the filter reference between the source and the destination, and not after the destination.<div dir="auto"><br></div><div dir="auto">This is to allow you to list multiple destinations, potentially applying different filters/parsers and other processing elements.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Dec 16, 2020, 07:58 Dan Egli <dan@newideatest.site> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div>
<p>Sorry, I should have said I THOUGHT it was working good. It loads
cleanly, and I have systemd set to forward it's journal to the
syslog, so syslog-ng is getting plenty of info to log. The problem
is that it's not listening to my filter. I specifically have two
filters. One to say only what came in in local7, and the other is
everything BUT what came in on local7. Yet when I started
syslog-ng I get IDENTICAL content to both files. In fact, I did a
quick test. rm messages dhcpd.log && systemctl restart
syslog-ng@default. Then I ran a cmp on dhcpd.log and messages, and
they came back identical. So why is all this stuff being written
to the wrong files? Here's my syslog-ng.conf file. Perhaps I did
something wrong?</p>
<p>options {<br>
threaded(yes);<br>
chain_hostnames(no);<br>
stats_freq(43200);<br>
mark_freq(3600);<br>
};<br>
filter dhcpfilter { facility(local7) };<br>
filter nondhcp { not filter(dhcpfilter) };<br>
source src { system(); internal(); };<br>
destination messages { file("/var/log/messages"); };<br>
destination dhcplog { file("/var/log/dhcpd.log"); };<br>
destination console_all { file("/dev/tty12"); };<br>
log { source(src); destination(messages); filter(nondhcp); };<br>
log { source(src); destination(console_all); };<br>
log { source(src); destination(dhcplog); filter(dhcpfilter); };<br>
</p>
<p><br>
</p>
<p>Notice in the first log line the mention of filter(nondhcp) -
i.e. messages NOT from dhcpd, and on the 3rd log line there is
filter(dhcpfilter) which should be only what comes across on
local7. So why am I getting systemd messages and syslog-ng
messages and what not in my dhcpd.log file?<br>
</p>
<p><br>
</p>
<p><br>
</p>
<div>On 12/15/2020 11:14 PM, Dan Egli wrote:<br>
</div>
<blockquote type="cite">
<p>syslog.local7 is a reference mnemonic of mine, sorry. It refers
to the local7 facility in syslog. And by saying the not should
be lowercase that fixed everything. I don't know why the
examples show it in uppercase, but thank you very much!<br>
</p>
<div>On 12/15/2020 11:09 PM, Balazs
Scheidler wrote:<br>
</div>
<blockquote type="cite">
<div dir="auto">
<div><br>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Dec 16, 2020,
06:04 Dan Egli <a href="mailto:dan@newideatest.site" target="_blank" rel="noreferrer"><dan@newideatest.site></a>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Help
me understand this, please? I have ISC dhcpd configured
to log to <br>
syslog.local7 (since I don't see an option to force it
into it's own log <br>
file).</blockquote>
</div>
</div>
<div dir="auto"><br>
</div>
<div dir="auto">Hmm syslog.local7 doesn't seem to be a
facility.severity pair.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Both syslog and localX are facility codes, so
either syslog or localX.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Syslog is normally reserved for the syslog
subsystem, so I wouldn't use that for dhcpd.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Also, logging and filtering based on facility
codes alone is not really flexible, as facility codes were
not kept up with changes of the underlying system. There are
dedicated codes for legacy stuff like "news" which people
rarely use, but lack newer stuff like kafka or docker.</div>
<div dir="auto"><br>
</div>
<div dir="auto">So in most cases, I see people use the PROGRAM
field, or even the IP address of devices to classify log
messages.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Still, in your use case the current set of
facility codes could be just fine.</div>
<div dir="auto"><br>
</div>
<div dir="auto">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> </blockquote>
</div>
</div>
<div dir="auto">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">So I
went into my syslog-ng file and created two filters,
just <br>
like on the example page of <a href="http://syslog-ng.com" rel="noreferrer
noreferrer noreferrer" target="_blank">syslog-ng.com</a>:<br>
<br>
filter dhcpmsgs { facility(23) );<br>
</blockquote>
</div>
</div>
<div dir="auto"><br>
</div>
<div dir="auto">This would filter on facility code 23, each
facility is mapped to a numeric code, I can't remember what
is 23, but you can check rfc3164 for the exact assignment. </div>
<div dir="auto"><br>
</div>
<div dir="auto">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
filter non_dhcp { NOT filter(dhcpmsgs) );<br>
</blockquote>
</div>
</div>
<div dir="auto"><br>
</div>
<div dir="auto">Negation should be lower case, e.g. "not"</div>
<div dir="auto">The closing paren should be a closing brace
(e.g. "}")</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto">
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <br>
I quoted almost directly from the example page on <a href="http://syslog-ng.com" rel="noreferrer
noreferrer noreferrer" target="_blank">syslog-ng.com</a>,
but I <br>
keep getting this error when I reload syslog-ng's
config:<br>
Error parsing filter expression, filter plugin NOT not
found OR you may <br>
not used double quotes in your filter expression in <br>
/etc/syslog-ng/syslog-ng.conf:25:18-25:21:<br>
<br>
What did I do wrong? Here's the lines I modified from
the syslog-ng page:<br>
filter demo_filter { host("example") and match("deny"
value("MESSAGE")) };<br>
filter inverted_demo_filter { NOT filter(demo_filter) }<br>
<br>
You can see the page at: <br>
<a href="https://www.syslog-ng.com/technical-documents/doc/syslog-ng-open-source-edition/3.16/administration-guide/53" rel="noreferrer noreferrer noreferrer" target="_blank">https://www.syslog-ng.com/technical-documents/doc/syslog-ng-open-source-edition/3.16/administration-guide/53</a>
<br>
<br>
<br>
-- <br>
Dan Egli<br>
From my Test Server<br>
<br>
______________________________________________________________________________<br>
Member info: <a href="https://lists.balabit.hu/mailman/listinfo/syslog-ng" rel="noreferrer noreferrer noreferrer" target="_blank">https://lists.balabit.hu/mailman/listinfo/syslog-ng</a><br>
Documentation: <a href="http://www.balabit.com/support/documentation/?product=syslog-ng" rel="noreferrer noreferrer noreferrer" target="_blank">http://www.balabit.com/support/documentation/?product=syslog-ng</a><br>
FAQ: <a href="http://www.balabit.com/wiki/syslog-ng-faq" rel="noreferrer noreferrer noreferrer" target="_blank">http://www.balabit.com/wiki/syslog-ng-faq</a><br>
<br>
</blockquote>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
<pre>______________________________________________________________________________
Member info: <a href="https://lists.balabit.hu/mailman/listinfo/syslog-ng" target="_blank" rel="noreferrer">https://lists.balabit.hu/mailman/listinfo/syslog-ng</a>
Documentation: <a href="http://www.balabit.com/support/documentation/?product=syslog-ng" target="_blank" rel="noreferrer">http://www.balabit.com/support/documentation/?product=syslog-ng</a>
FAQ: <a href="http://www.balabit.com/wiki/syslog-ng-faq" target="_blank" rel="noreferrer">http://www.balabit.com/wiki/syslog-ng-faq</a>
</pre>
</blockquote>
<pre cols="72">--
Dan Egli
>From my Test Server</pre>
<br>
<fieldset></fieldset>
<pre>______________________________________________________________________________
Member info: <a href="https://lists.balabit.hu/mailman/listinfo/syslog-ng" target="_blank" rel="noreferrer">https://lists.balabit.hu/mailman/listinfo/syslog-ng</a>
Documentation: <a href="http://www.balabit.com/support/documentation/?product=syslog-ng" target="_blank" rel="noreferrer">http://www.balabit.com/support/documentation/?product=syslog-ng</a>
FAQ: <a href="http://www.balabit.com/wiki/syslog-ng-faq" target="_blank" rel="noreferrer">http://www.balabit.com/wiki/syslog-ng-faq</a>
</pre>
</blockquote>
<pre cols="72">--
Dan Egli
>From my Test Server</pre>
</div>
______________________________________________________________________________<br>
Member info: <a href="https://lists.balabit.hu/mailman/listinfo/syslog-ng" rel="noreferrer noreferrer" target="_blank">https://lists.balabit.hu/mailman/listinfo/syslog-ng</a><br>
Documentation: <a href="http://www.balabit.com/support/documentation/?product=syslog-ng" rel="noreferrer noreferrer" target="_blank">http://www.balabit.com/support/documentation/?product=syslog-ng</a><br>
FAQ: <a href="http://www.balabit.com/wiki/syslog-ng-faq" rel="noreferrer noreferrer" target="_blank">http://www.balabit.com/wiki/syslog-ng-faq</a><br>
<br>
</blockquote></div>