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<div id="preamble"><h1>Apache Module mod_journald</h1>
<div class="toplang">
<p><span>Available Languages: </span><a href="../en/mod/mod_journald.html" title="English"> en </a> |
<a href="../fr/mod/mod_journald.html" hreflang="fr" rel="alternate" title="Fran�ais"> fr </a></p>
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<table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td>Provides "journald" ErrorLog provider</td></tr>
<tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr>
<tr><th><a href="module-dict.html#ModuleIdentifier">Module�Identifier:</a></th><td>journald_module</td></tr>
<tr><th><a href="module-dict.html#SourceFile">Source�File:</a></th><td>mod_journald.c</td></tr></table>
<h3>Summary</h3>
<p>This module provides "journald" ErrorLog provider. It allows logging
error messages and CustomLog/TransferLog via systemd-journald(8).</p>
</div>
<div id="quickview"><h3>Topics</h3>
<ul id="topics">
<li><img alt="" src="../images/down.gif" /> <a href="#structured">Structured logging</a></li>
<li><img alt="" src="../images/down.gif" /> <a href="#examples">Examples</a></li>
</ul><h3 class="directives">Directives</h3>
<p>This module provides no
directives.</p>
<h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_journald">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_journald">Report a bug</a></li></ul><h3>See also</h3>
<ul class="seealso">
<li><a href="#comments_section">Comments</a></li></ul></div>
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<h2><a name="structured" id="structured">Structured logging</a></h2>
<p>Systemd-journald allows structured logging and therefore it is
possible to filter logged messages according to various variables.
Currently supported variables are:
</p>
<dl>
<dt><code>LOG</code></dt>
<dd>The name of the log. For ErrorLog, the value is "error_log".
For CustomLog or TransferLog, the value is the first argument of
these directives.</dd>
<dt><code>REQUEST_HOSTNAME</code></dt>
<dd>Host, as set by full URI or Host: header in the request.</dd>
<dt><code>REQUEST_USER</code></dt>
<dd>If an authentication check was made, this gets set to the user
name.</dd>
<dt><code>REQUEST_USERAGENT_IP</code></dt>
<dd>The address that originated the request.</dd>
<dt><code>REQUEST_URI</code></dt>
<dd>The path portion of the URI, or "/" if no path provided.</dd>
<dt><code>SERVER_HOSTNAME</code></dt>
<dd>The hostname of server for which the log message has been
generated.</dd>
</dl>
<p>These variables can be for example used to show only log messages
for particular URI using <code>journalctl</code>:
</p>
<pre class="prettyprint lang-">journalctl REQUEST_URI=/index.html -a</pre>
<p>For more examples, see systemd-journalctl documentation.</p>
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<div class="section">
<h2><a name="examples" id="examples">Examples</a></h2>
<p>Using <code>journald</code> in ErrorLog directive (see <code class="module"><a href="../mod/core.html">core</a></code>)
instead of a filename enables logging via systemd-journald(8)
if the system supports it.
</p>
<pre class="prettyprint lang-config">ErrorLog journald</pre>
<p>Using <code>journald</code> as an error log provider in CustomLog
directive (see <code class="module"><a href="../mod/mod_log_config.html">mod_log_config</a></code>) enables
logging via systemd-journald(8) if the system supports it.
</p>
<pre class="prettyprint lang-config">CustomLog "journald" "%h %l %u %t \"%r\" %>s %b"</pre>
<div class="warning"><h3>Performance warning</h3><p>
Currently, systemd-journald is not designed for high-throughput logging
and logging access_log to systemd-journald could decrease the performance
a lot.
</p></div>
</div>
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