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+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<!--
+ This file is part of systemd.
+
+ Copyright 2010 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ systemd is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+-->
+
+<refentry id="systemd-journald.conf">
+ <refentryinfo>
+ <title>systemd-journald.conf</title>
+ <productname>systemd</productname>
+
+ <authorgroup>
+ <author>
+ <contrib>Developer</contrib>
+ <firstname>Lennart</firstname>
+ <surname>Poettering</surname>
+ <email>lennart@poettering.net</email>
+ </author>
+ </authorgroup>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>systemd-journald.conf</refentrytitle>
+ <manvolnum>5</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>systemd-journald.conf</refname>
+ <refpurpose>Journal service configuration file</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <para><filename>systemd-journald.conf</filename></para>
+ </refsynopsisdiv>
+
+ <refsect1>
+ <title>Description</title>
+
+ <para>This files configures various parameters of the systemd journal service.</para>
+
+ </refsect1>
+
+ <refsect1>
+ <title>Options</title>
+
+ <para>All options are configured in the
+ <literal>[Journal]</literal> section:</para>
+
+ <variablelist>
+
+ <varlistentry>
+ <term><varname>Compress=</varname></term>
+
+ <listitem><para>Takes a boolean
+ value. If enabled (the default) data
+ objects that shall be stored in the
+ journal and are larger than a certain
+ threshold are compressed with the XZ
+ compression algorithm before they are
+ written to the file
+ system.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>RateLimitInterval=</varname></term>
+ <term><varname>RateLimitBurst=</varname></term>
+
+ <listitem><para>Configures the rate
+ limiting that is applied to all
+ messages generated on the system. If
+ in the time interval defined by
+ <varname>RateLimitInterval=</varname>
+ more messages than specified in
+ <varname>RateLimitBurst=</varname> are
+ logged by a service all further
+ messages within the interval are
+ dropped, until the interval is over. A
+ message about the number of dropped
+ messages is generated. This rate
+ limiting is applied per-service, so
+ that two services which log do not
+ interfere with each other's
+ limit. Defaults to 100 messages in
+ 10s. The time specification for
+ <varname>RateLimitInterval=</varname>
+ may be specified in the following
+ units: <literal>s</literal>,
+ <literal>min</literal>,
+ <literal>h</literal>,
+ <literal>ms</literal>,
+ <literal>us</literal>. To turn off any
+ kind of rate limiting, set either
+ value to 0.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>SystemMaxUse=</varname></term>
+ <term><varname>SystemKeepFree=</varname></term>
+ <term><varname>SystemMaxFileSize=</varname></term>
+ <term><varname>SystemMinFileSize=</varname></term>
+ <term><varname>RuntimeMaxUse=</varname></term>
+ <term><varname>RuntimeKeepFree=</varname></term>
+ <term><varname>RuntimeMaxFileSize=</varname></term>
+ <term><varname>RuntimeMinFileSize=</varname></term>
+
+ <listitem><para>Enforce size limits on
+ the journal files stored. The options
+ prefixed with
+ <literal>System</literal> apply to the
+ journal files when stored on a
+ persistant file system, more
+ specifically
+ <filename>/var/log/journal</filename>. The
+ options prefixed with
+ <literal>Runtime</literal> apply to
+ the journal files when stored on a
+ volatile in-memory file system, more
+ specifically
+ <filename>/run/log/journal</filename>. The
+ former is used only when
+ <filename>/var</filename> is mounted,
+ writable and the directory
+ <filename>/var/log/journal</filename>
+ exists. Otherwise only the latter
+ applies. Note that this means that
+ during early boot and if the
+ administrator disabled persistant
+ logging only the latter options apply,
+ while the former apply if persistant
+ logging is enabled and the system is
+ fully booted
+ up. <varname>SystemMaxUse=</varname>
+ and <varname>RuntimeMaxUse=</varname>
+ control how much disk space the
+ journal may use up at
+ maximum. Defaults to 10% of the size
+ of the respective file
+ system. <varname>SystemKeepFree=</varname>
+ and
+ <varname>RuntimeKeepFree=</varname>
+ control how much disk space the
+ journal shall always leave free for
+ other uses if less than the disk space
+ configured in
+ <varname>SystemMaxUse=</varname> and
+ <varname>RuntimeMaxUse=</varname> is
+ available. Defaults to 5% of the size
+ of the respective file
+ system. <varname>SystemMaxFileSize=</varname>
+ and
+ <varname>RuntimeMaxFileSize=</varname>
+ control how large individual journal
+ files may grow at maximum. This
+ influences the granularity in which
+ disk space is made available through
+ rotation, i.e. deletion of historic
+ data. Defaults to one eigth of the
+ values configured with
+ <varname>SystemMaxUse=</varname> and
+ <varname>RuntimeMaxUse=</varname>, so
+ that usually seven rotated journal
+ files are kept as
+ history. <varname>SystemMinFileSize=</varname>
+ and
+ <varname>RuntimeMinFileSize=</varname>
+ control how large individual journal
+ files grow at minimum. Defaults to
+ 64K. Specify values in bytes or use
+ K, M, G, T, P, E as units for the
+ specified sizes. Note that size limits
+ are enforced synchronously to journal
+ files as they are extended, and need
+ no explicit rotation step triggered by
+ time.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>ForwardToSyslog=</varname></term>
+ <term><varname>ForwardToKMsg=</varname></term>
+ <term><varname>ForwardToConsole=</varname></term>
+
+ <listitem><para>Control whether log
+ messages received by the journal
+ daemon shall be forwarded to a
+ traditional syslog daemon, to the
+ kernel log buffer (kmsg), or to the
+ system console. These options take
+ boolean arguments. If forwarding to
+ syslog is enabled but no syslog daemon
+ is running the respective option has
+ no effect. By default only forwarding
+ to syslog is enabled. These settings
+ may be overriden at boot time with the
+ kernel command line options
+ <literal>systemd_journald.forward_to_syslog=</literal>,
+ <literal>systemd_journald.forward_to_kmsg=</literal>
+ and
+ <literal>systemd_journald.forward_to_console=</literal>. If
+ forwarding to the kernel log buffer and
+ <varname>ImportKernel=</varname> is
+ enabled at the same time care is taken
+ to avoid logging loops. It is safe to
+ use these options in combination.
+ </para></listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><varname>ImportKernel=</varname></term>
+
+ <listitem><para>Controls whether
+ kernel log messages shall be stored in
+ the journal. Takes a boolean argument
+ and defaults to enabled. Note that
+ currently only one userspace service
+ can read kernel messages at a time,
+ which means that kernel log message
+ reading might get corrupted if it
+ is enabled in more than one service,
+ for example in both the journal and a
+ traditional syslog service.
+ </para></listitem>
+ </varlistentry>
+ </variablelist>
+
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd-journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>
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