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<html><head>
<title>Writing syslog Data to MySQL</title>
<meta name="KEYWORDS" content="syslog, mysql, syslog to mysql, howto">
</head>
<body>
<h1>Compatibility notes for rsyslog v3</h1>
<P><small><i>Written by
<a href="http://www.gerhards.net/rainer">Rainer
Gerhards</a> (2007-12-17)</i></small></P>
<P>Rsyslog aims to be a drop-in replacement for sysklogd. However, version 3 has
some considerable enhancements, which lead to some backward compatibility issues
both in regard to sysklogd and rsyslog v1 and v2.</P>
<P>Rsyslog v3 is currently under initial development. Compatibility issues may
be resolved, so be sure to check back often. Also, comments and suggestions are
appreciated. Feedback right in time can now have a big impact on the route we
take ;)</P>
<h2>command line options</h2>
<p>A number of command line options have been removed. New config file
directives have been added for them. Once we implement compatibiltiy mode, these
options will return, but only if running in non-v3-native mode.</p>
<h2>-m command line option</h2>
<P>The -m command line option is ignored for the time being. There is no default
mark period. If you need a 20 minute mark period you need to</P>
<P><b>$ModLoad immark # wherever this is<br>
$MarkMessageInterval 1800 # 20 minutes</b></P>
<h2>klogd</h2>
<P>klogd has (finally) been replaced by a loadable input module. To enable klogd
functionality, do</P>
<P><b>$ModLoad imklog</b></P>
<P>A limited set of klogd command line settings is now supported via
rsyslog.conf. That set of configuration directives is to be expanded. So far, we
support:</P>
<P>$klogSymbolsTwice [on/off]<br>
$DebugPrintKernelSymbols [on/off] # spits *a lot* of messages at startup</P>
<h1>TODO List</h1>
<P>I have decided to move the todo list for v3 also into this document. After
all, it is kind of a compatibility issue ;) But, more seriously, I think this is
a good place to make sure nothing is forgotten. Remember that as of now, rsyslog
v3 is in its early stage of development and so there definitely are some nits
that will give you grief. This section here tells you what it is.</P>
<h2>-c option</h2>
<P>needs to be implemented. So far, only -c3 is supported. Everything else does
not change anything but just provides a warning message. In short: there is no
backwards compatibility yet.</P>
<h2>Thread Termination</h2>
<p>Thread termination in mode 1 needs to be looked at. I begin to think that it
is OK if we simply cancel the thread, because we already have a different
cleanup function. Otherwise, there is a potential for a race condition after we
unblocked the TermOK mutex but before select() is entered. If the signal then
occurs, we may have a problem. However, I would like to create the other input
modules first so that I have more working experience with termination
requirements. Again, I think this will lead to changes in thread termination.</p>
<p>So far, this issue is resolved, but there is still some code present that
needs to go away (right now disabled). I keep it in because I will make the
final decision based on experience gained during creation of input modules.</p>
<h2>Call Encapsulation</h2>
<p>In an ideal world, the modules should call back only to some well-defined and
specifically exported interface functions. Right now, we do not have an ideal
world and the input modules make some calls back into the core. This needs to be
re-thought but is accepted for the time being.</p>
<h2>No real Modules yet</h2>
<p>As already said in "Call Encapsulation", the modules look like such, but are
not really able to work stand alone. The worst in this regard are</p>
<ul>
<li>imudp/omfwd/syslogd.c</li>
<li>imtcp</li>
</ul>
<p>But the others are not necessarily better. I have moved the code to the
modules, because now at least the majority of code is where it belongs to. But
there are still a large number of global variables, cross-function calls and the
like. This needs to be solved when we try to claim a real modular design. That's
not an easy task, but, hey, aren't we up for that...? ;)</p>
<p> </p>
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