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Code Editor : LogLevels.html

<!DOCTYPE html>
<html>
<head>
<title>ProFTPD Logging: Log Levels</title>
</head>

<hr>
<center><h2>ProFTPD Logging: Log Levels</h2></center>
<hr>

Log Levels
As mentioned in the <a href="Logging.html#Syslog">logging</a> documentation,
log messages are logged at different log levels (also known as
log priorities), and with different facilities (i.e.
the component generating the log message).

The following table lists the supported log levels, in descending priority
order. Thus the <code>DEBUG</code> level has the lowest priority, and the
<code>EMERG</code> level has the highest priority.

<table border=1 summary="Log Levels">
 <tr>
 <td>&nbsp;Level&nbsp;</td>
 <td>&nbsp;Description&nbsp;</td>
 </tr>

<tr>
 <td>&nbsp;<code>EMERG</code>&nbsp;</td>
 <td>&nbsp;Fatal/unrecoverable error/condition, application is unusable and
 stops immediately&nbsp;</td>
 </tr>

<tr>
 <td>&nbsp;<code>ALERT</code>&nbsp;</td>
 <td>&nbsp;Condition requires immediate intervention by
 administrator/operator&nbsp;</td>
 </tr>

<tr>
 <td>&nbsp;<code>CRIT</code>&nbsp;</td>
 <td>&nbsp;Condition should be corrected immediately, but indicates
 e.g. failure in secondary system/library&nbsp;</td>
 </tr>

<tr>
 <td>&nbsp;<code>ERR</code>&nbsp;</td>
 <td>&nbsp;Non-urgent failure conditions that should be relayed to developers
 and/or administrators; should be resolved/corrected soon&nbsp;</td>
 </tr>

<tr>
 <td>&nbsp;<code>WARNING</code>&nbsp;</td>
 <td>&nbsp;Unexpected error/condition that may require intervention to
 review/correct&nbsp;</td>
 </tr>

<tr>
 <td>&nbsp;<code>NOTICE</code>&nbsp;</td>
 <td>&nbsp;Significant/noteworthy condition, no intervention/action
 required&nbsp;</td>
 </tr>

<tr>
 <td>&nbsp;<code>INFO</code>&nbsp;</td>
 <td>&nbsp;Normal operating conditions, no intervention/action
 required&nbsp;</td>
 </tr>

<tr>
 <td>&nbsp;<code>DEBUG</code>&nbsp;</td>
 <td>&nbsp;Internal details of application operations useful to developers,
 not necessarily useful during normal operations&nbsp;</td>
 </tr>
</table>

The <code>proftpd</code> daemon can use any or all of the above log levels for
its emitted log messages, depending on the situation. You might find that
you only want <code>proftpd</code> to log messages above a certain level; for
example, you might not be interested in <code>INFO</code> and <code>DEBUG</code>
level messages. ProFTPD logs all levels by default. To tell
<code>proftpd</code> to silently ignore all log messages below a certain level,
use the <a href="../modules/mod_core.html#SyslogLevel"><code>SyslogLevel</code></a> directive. Thus to ignore <code>INFO</code>/<code>DEBUG</code> messages,
you would use:
<pre>
 SyslogLevel notice
</pre>

Note that additional log filtering is also done by the <code>syslogd</code>
daemon, to which <code>proftpd</code> logs by default. You will need to
consult your <code>syslogd</code> configuration (typically found in
<code>/etc/syslog.conf</code>) to see whether it is capturing log messages
from the facility used by <code>proftpd</code> (default is "daemon"), and
whether it is filtering out messages below a certain level/priority.

If you need to tell <code>proftpd</code> to use a different facility,
so that it matches your <code>/etc/syslog.conf</code> settings for example,
you can use the <a href="../modules/mod_core.html#SyslogFacility"><code>SyslogFacility</code></a> directive like so:
<pre>
 # Tell proftpd to log using the "ftp" facility, rather than "daemon"
 SyslogFacility ftp
</pre>

<a name="DebugLevel">
The <code>DEBUG</code> Level 
ProFTPD treats the <code>DEBUG</code> log level a little differently. There
are so many conditions which are relevant only when triaging a specific issue
(such as figuring out why a user cannot log in, or why a file cannot be
uploaded) that the <code>DEBUG</code> level would become cluttered. Additional
filtering of these debug messages is needed. Thus ProFTPD imposes its own
notion of debug levels within the <code>DEBUG</code> logging level/priority.

The <a href="../modules/mod_core.html#DebugLevel"><code>DebugLevel</code></a>
directive is used to control the granularity/verbosity of the <code>DEBUG</code>
level messages; the default level is 0, and goes to 10 (inclusive). In general,
the higher the <code>DebugLevel</code>, the more debug messages will be emitted
by <code>proftpd</code> to the <code>DEBUG</code> logging level/priority.

<a name="TraceLog">
Additional Logging 
Note that ProFTPD also supports even finer-grained logging of intervals via
its <a href="Tracing.html">trace logging</a>. Trace logging, however, is
completely unrelated to <code>syslogd</code>, and thus the syslog
facility and level concepts/filtering do not apply
to trace logging.

</body>
</html>

${this.title}

Code Editor : LogLevels.html