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- <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 21
7</span><hr><div class="refentry"><a name="systemd-journald.service"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd-journald.service, systemd-journald.socket, systemd-journald-dev-log.socket, systemd-journald — Journal service</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">systemd-journald.service</code></p><p><code class="filename">systemd-journald.socket</code></p><p><code class="filename">systemd-journald-dev-log.socket</code></p><p><code class="filename">/usr/lib/systemd/systemd-journald</code></p></div><div class="refsect1"><a name="idm214180661472"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="filename">systemd-journald</code> is a
+ <a href="../libudev/index.html">gudev </a><span style="float:right">systemd 21
8</span><hr><div class="refentry"><a name="systemd-journald.service"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>systemd-journald.service, systemd-journald.socket, systemd-journald-dev-log.socket, systemd-journald — Journal service</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><p><code class="filename">systemd-journald.service</code></p><p><code class="filename">systemd-journald.socket</code></p><p><code class="filename">systemd-journald-dev-log.socket</code></p><p><code class="filename">/usr/lib/systemd/systemd-journald</code></p></div><div class="refsect1"><a name="idm140644670029440"></a><h2 id="Description">Description<a class="headerlink" title="Permalink to this headline" href="#Description">¶</a></h2><p><code class="filename">systemd-journald</code> is a
system service that collects and stores logging data.
It creates and maintains structured, indexed journals
- based on logging information that is received from the
- kernel, from user processes via the libc
- <a href="http://man7.org/linux/man-pages/man3/syslog.3.html"><span class="citerefentry"><span class="refentrytitle">syslog</span>(3)</span></a>
- call, from standard input and standard error of system
- services or via its native API. It will implicitly
- collect numerous metadata fields for each log
- messages in a secure and unfakeable way. See
+ based on logging information that is received from a
+ variety of sources:</p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>Kernel log messages, via kmsg</p></li><li class="listitem"><p>Simple system log messages, via the
+ libc <a href="http://man7.org/linux/man-pages/man3/syslog.3.html"><span class="citerefentry"><span class="refentrytitle">syslog</span>(3)</span></a>
+ call</p></li><li class="listitem"><p>Structured system log messages via the
+ native Journal API, see
+ <a href="http://man7.org/linux/man-pages/man4/sd_journal_print.4.html"><span class="citerefentry"><span class="refentrytitle">sd_journal_print</span>(4)</span></a></p></li><li class="listitem"><p>Standard output and
+ standard error of system
+ services</p></li><li class="listitem"><p>Audit records, via the audit subsystem</p></li></ul></div><p>The daemon will implicitly collect numerous
+ metadata fields for each log messages in a secure and
+ unfakeable way. See
<a href="systemd.journal-fields.html"><span class="citerefentry"><span class="refentrytitle">systemd.journal-fields</span>(7)</span></a>
for more information about the collected metadata.
</p><p>Log data collected by the journal is primarily
<code class="filename">/var/log/journal/</code> where
<code class="filename">systemd-journald</code> will then store
the data.</p><p><code class="filename">systemd-journald</code> will
- forward all received log messages to the <code class="constant">AF_UNIX</code>
- <code class="constant">SOCK_DGRAM</code> socket
+ forward all received log messages to the <code class="constant">AF_UNIX</code>/<code class="constant">SOCK_DGRAM</code> socket
<code class="filename">/run/systemd/journal/syslog</code>, if it exists, which
may be used by Unix syslog daemons to process the data
further.</p><p>See
<a href="journald.conf.html"><span class="citerefentry"><span class="refentrytitle">journald.conf</span>(5)</span></a>
for information about the configuration of this
- service.</p></div><div class="refsect1"><a name="idm
214184603344"></a><h2 id="Signals">Signals<a class="headerlink" title="Permalink to this headline" href="#Signals">¶</a></h2><div class="variablelist"><dl class="variablelist"><dt id="SIGUSR1"><span class="term">SIGUSR1</span><a class="headerlink" title="Permalink to this term" href="#SIGUSR1">¶</a></dt><dd><p>Request that journal
+ service.</p></div><div class="refsect1"><a name="idm
140644666232464"></a><h2 id="Signals">Signals<a class="headerlink" title="Permalink to this headline" href="#Signals">¶</a></h2><div class="variablelist"><dl class="variablelist"><dt id="SIGUSR1"><span class="term">SIGUSR1</span><a class="headerlink" title="Permalink to this term" href="#SIGUSR1">¶</a></dt><dd><p>Request that journal
data from <code class="filename">/run/</code>
is flushed to
<code class="filename">/var/</code> in order to
regardless of the
configuration.</p></dd><dt id="SIGUSR2"><span class="term">SIGUSR2</span><a class="headerlink" title="Permalink to this term" href="#SIGUSR2">¶</a></dt><dd><p>Request immediate
rotation of the journal
- files.</p></dd></dl></div></div><div class="refsect1"><a name="idm
214184595536"></a><h2 id="Kernel Command Line">Kernel Command Line<a class="headerlink" title="Permalink to this headline" href="#Kernel%20Command%20Line">¶</a></h2><p>A few configuration parameters from
+ files.</p></dd></dl></div></div><div class="refsect1"><a name="idm
140644670120976"></a><h2 id="Kernel Command Line">Kernel Command Line<a class="headerlink" title="Permalink to this headline" href="#Kernel%20Command%20Line">¶</a></h2><p>A few configuration parameters from
<code class="filename">journald.conf</code> may be overridden on
the kernel command line:</p><div class="variablelist"><dl class="variablelist"><dt id="systemd.journald.forward_to_syslog="><span class="term"><code class="varname">systemd.journald.forward_to_syslog=</code>, </span><span class="term"><code class="varname">systemd.journald.forward_to_kmsg=</code>, </span><span class="term"><code class="varname">systemd.journald.forward_to_console=</code>, </span><span class="term"><code class="varname">systemd.journald.forward_to_wall=</code></span><a class="headerlink" title="Permalink to this term" href="#systemd.journald.forward_to_syslog=">¶</a></dt><dd><p>Enables/disables
forwarding of collected log messages
system console or wall.
</p><p>See
<a href="journald.conf.html"><span class="citerefentry"><span class="refentrytitle">journald.conf</span>(5)</span></a>
- for information about these settings.</p></dd></dl></div></div><div class="refsect1"><a name="idm
214184588240"></a><h2 id="Access Control">Access Control<a class="headerlink" title="Permalink to this headline" href="#Access%20Control">¶</a></h2><p>Journal files are, by default, owned and readable
+ for information about these settings.</p></dd></dl></div></div><div class="refsect1"><a name="idm
140644670113680"></a><h2 id="Access Control">Access Control<a class="headerlink" title="Permalink to this headline" href="#Access%20Control">¶</a></h2><p>Journal files are, by default, owned and readable
by the "<code class="literal">systemd-journal</code>" system group
but are not writable. Adding a user to this group thus
enables her/him to read the journal files.</p><p>By default, each logged in user will get her/his
for existing journal files and for future journal
files created in the
<code class="filename">/var/log/journal/</code>
- directory.</p></div><div class="refsect1"><a name="idm
214184573264"></a><h2 id="Files">Files<a class="headerlink" title="Permalink to this headline" href="#Files">¶</a></h2><div class="variablelist"><dl class="variablelist"><dt id="/etc/systemd/journald.conf"><span class="term"><code class="filename">/etc/systemd/journald.conf</code></span><a class="headerlink" title="Permalink to this term" href="#/etc/systemd/journald.conf">¶</a></dt><dd><p>Configure
+ directory.</p></div><div class="refsect1"><a name="idm
140644670098768"></a><h2 id="Files">Files<a class="headerlink" title="Permalink to this headline" href="#Files">¶</a></h2><div class="variablelist"><dl class="variablelist"><dt id="/etc/systemd/journald.conf"><span class="term"><code class="filename">/etc/systemd/journald.conf</code></span><a class="headerlink" title="Permalink to this term" href="#/etc/systemd/journald.conf">¶</a></dt><dd><p>Configure
<span class="command"><strong>systemd-journald</strong></span>
behaviour. See
<a href="journald.conf.html"><span class="citerefentry"><span class="refentrytitle">journald.conf</span>(5)</span></a>.
set in the
<a href="journald.conf.html"><span class="citerefentry"><span class="refentrytitle">journald.conf</span>(5)</span></a>
configuration file.
- </p></dd></dl></div></div><div class="refsect1"><a name="idm
214179589488"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
+ </p></dd></dl></div></div><div class="refsect1"><a name="idm
140644670079792"></a><h2 id="See Also">See Also<a class="headerlink" title="Permalink to this headline" href="#See%20Also">¶</a></h2><p>
<a href="systemd.html"><span class="citerefentry"><span class="refentrytitle">systemd</span>(1)</span></a>,
<a href="journalctl.html"><span class="citerefentry"><span class="refentrytitle">journalctl</span>(1)</span></a>,
<a href="journald.conf.html"><span class="citerefentry"><span class="refentrytitle">journald.conf</span>(5)</span></a>,
<a href="sd-journal.html"><span class="citerefentry"><span class="refentrytitle">sd-journal</span>(3)</span></a>,
<a href="systemd-coredump.html"><span class="citerefentry"><span class="refentrytitle">systemd-coredump</span>(8)</span></a>,
<a href="setfacl.html"><span class="citerefentry"><span class="refentrytitle">setfacl</span>(1)</span></a>,
+ <a href="http://man7.org/linux/man-pages/man4/sd_journal_print.4.html"><span class="citerefentry"><span class="refentrytitle">sd_journal_print</span>(4)</span></a>,
<span class="command"><strong>pydoc systemd.journal</strong></span>.
</p></div></div></body></html>
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