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26687bf8a9
Add option to force journal sync with fsync. Default timeout is 5min. Interval configured via SyncIntervalSec option at journal.conf. Synced journal files will be marked as OFFLINE. Manual sync can be performed via sending SIGUSR1.
422 lines
23 KiB
XML
422 lines
23 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="journald.conf">
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<refentryinfo>
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<title>journald.conf</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>journald.conf</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>journald.conf</refname>
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<refpurpose>Journal service configuration file</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>/etc/systemd/journald.conf</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>This files configures various parameters of the
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systemd journal service
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<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>All options are configured in the
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<literal>[Journal]</literal> section:</para>
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<variablelist>
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<varlistentry>
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<term><varname>Storage=</varname></term>
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<listitem><para>Controls where to
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store journal data. One of
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<literal>volatile</literal>,
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<literal>persistent</literal>,
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<literal>auto</literal> and
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<literal>none</literal>. If
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<literal>volatile</literal> journal
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log data will be stored only in
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memory, i.e. below the
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<filename>/run/log/journal</filename>
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hierarchy (which is created if
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needed). If
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<literal>persistent</literal> data will
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be stored preferably on disk,
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i.e. below the
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<filename>/var/log/journal</filename>
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hierarchy (which is created if
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needed), with a fallback to
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<filename>/run/log/journal</filename>
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(which is created if needed), during
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early boot and if the disk is not
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writable. <literal>auto</literal> is
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similar to
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<literal>persistent</literal> but the
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directory
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<filename>/var/log/journal</filename>
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is not created if needed, so that its
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existence controls where log data
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goes. <literal>none</literal> turns
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off all storage, all log data received
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will be dropped. Forwarding to other
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targets, such as the console, the
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kernel log buffer or a syslog daemon
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will still work however. Defaults to
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<literal>auto</literal>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Compress=</varname></term>
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<listitem><para>Takes a boolean
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value. If enabled (the default) data
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objects that shall be stored in the
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journal and are larger than a certain
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threshold are compressed with the XZ
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compression algorithm before they are
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written to the file
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system.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>Seal=</varname></term>
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<listitem><para>Takes a boolean
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value. If enabled (the default) and a
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sealing key is available (as created
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by
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<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>'s
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<option>--setup-keys</option>
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command), forward secure sealing (FSS) for
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all persistent journal files is
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enabled.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SplitMode=</varname></term>
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<listitem><para>Controls whether to
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split up journal files per user. One
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of <literal>login</literal>,
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<literal>uid</literal> and
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<literal>none</literal>. If
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<literal>login</literal> each logged
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in user will get his own journal
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files, but systemd user IDs will log
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into the system journal. If
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<literal>uid</literal> any user ID
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will get his own journal files
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regardless whether it belongs to a
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system service or refers to a real
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logged in user. If
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<literal>none</literal> journal files
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are not split up per-user and all
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messages are stored in the single
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system journal. Note that splitting
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up journal files per-user is only
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available of journals are stored
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persistently. If journals are stored
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on volatile storage (see above) only a
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single journal file for all user IDs
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is kept. Defaults to
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<literal>login</literal>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>RateLimitInterval=</varname></term>
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<term><varname>RateLimitBurst=</varname></term>
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<listitem><para>Configures the rate
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limiting that is applied to all
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messages generated on the system. If
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in the time interval defined by
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<varname>RateLimitInterval=</varname>
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more messages than specified in
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<varname>RateLimitBurst=</varname> are
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logged by a service all further
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messages within the interval are
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dropped, until the interval is over. A
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message about the number of dropped
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messages is generated. This rate
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limiting is applied per-service, so
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that two services which log do not
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interfere with each other's
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limits. Defaults to 200 messages in
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10s. The time specification for
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<varname>RateLimitInterval=</varname>
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may be specified in the following
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units: <literal>s</literal>,
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<literal>min</literal>,
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<literal>h</literal>,
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<literal>ms</literal>,
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<literal>us</literal>. To turn off any
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kind of rate limiting, set either
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value to 0.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SystemMaxUse=</varname></term>
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<term><varname>SystemKeepFree=</varname></term>
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<term><varname>SystemMaxFileSize=</varname></term>
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<term><varname>RuntimeMaxUse=</varname></term>
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<term><varname>RuntimeKeepFree=</varname></term>
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<term><varname>RuntimeMaxFileSize=</varname></term>
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<listitem><para>Enforce size limits on
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the journal files stored. The options
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prefixed with
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<literal>System</literal> apply to the
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journal files when stored on a
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persistent file system, more
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specifically
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<filename>/var/log/journal</filename>. The
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options prefixed with
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<literal>Runtime</literal> apply to
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the journal files when stored on a
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volatile in-memory file system, more
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specifically
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<filename>/run/log/journal</filename>. The
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former is used only when
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<filename>/var</filename> is mounted,
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writable and the directory
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<filename>/var/log/journal</filename>
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exists. Otherwise only the latter
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applies. Note that this means that
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during early boot and if the
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administrator disabled persistent
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logging only the latter options apply,
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while the former apply if persistent
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logging is enabled and the system is
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fully booted
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up. <varname>SystemMaxUse=</varname>
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and <varname>RuntimeMaxUse=</varname>
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control how much disk space the
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journal may use up at
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maximum. Defaults to 10% of the size
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of the respective file
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system. <varname>SystemKeepFree=</varname>
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and
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<varname>RuntimeKeepFree=</varname>
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control how much disk space the
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journal shall always leave free for
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other uses if less than the disk space
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configured in
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<varname>SystemMaxUse=</varname> and
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<varname>RuntimeMaxUse=</varname> is
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available. Defaults to 5% of the size
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of the respective file
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system. <varname>SystemMaxFileSize=</varname>
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and
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<varname>RuntimeMaxFileSize=</varname>
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control how large individual journal
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files may grow at maximum. This
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influences the granularity in which
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disk space is made available through
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rotation, i.e. deletion of historic
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data. Defaults to one eighth of the
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values configured with
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<varname>SystemMaxUse=</varname> and
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<varname>RuntimeMaxUse=</varname>, so
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that usually seven rotated journal
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files are kept as history. Specify
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values in bytes or use K, M, G, T, P,
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E as units for the specified
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sizes. Note that size limits are
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enforced synchronously to journal
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files as they are extended, and need
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no explicit rotation step triggered by
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time.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>MaxFileSec=</varname></term>
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<listitem><para>The maximum time to
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store entries in a single journal
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file, before rotating to the next
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one. Normally time-based rotation
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should not be required as size-based
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rotation with options such as
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<varname>SystemMaxFileSize=</varname>
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should be sufficient to ensure that
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journal files don't grow without
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bounds. However, to ensure that not
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too much data is lost at once when old
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journal files are deleted it might
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make sense to change this value from
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the default of one month. Set to 0 to
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turn off this feature. This setting
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takes time values which may be
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suffixed with the units year, month,
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week, day, h, m to override the
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default time unit of
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seconds.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>MaxRetentionSec=</varname></term>
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<listitem><para>The maximum time to
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store journal entries. This
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controls whether journal files
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containing entries older then the
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specified time span are
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deleted. Normally time-based deletion
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of old journal files should not be
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required as size-based deletion with
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options such as
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<varname>SystemMaxUse=</varname>
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should be sufficient to ensure that
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journal files don't grow without
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bounds. However, to enforce data
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retention policies it might make sense
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to change this value from the
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default of 0 (which turns off this
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feature). This setting also takes
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time values which may be suffixed with
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the units year, month, week, day, h, m
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to override the default time unit of
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seconds. </para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>SyncIntervalSec=</varname></term>
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<listitem><para>The timeout before syncing journal
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data to disk. After syncing journal files have
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OFFLINE state. Default timeout is 5 minutes.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>ForwardToSyslog=</varname></term>
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<term><varname>ForwardToKMsg=</varname></term>
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<term><varname>ForwardToConsole=</varname></term>
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<listitem><para>Control whether log
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messages received by the journal
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daemon shall be forwarded to a
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traditional syslog daemon, to the
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kernel log buffer (kmsg), or to the
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system console. These options take
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boolean arguments. If forwarding to
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syslog is enabled but no syslog daemon
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is running the respective option has
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no effect. By default only forwarding
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to syslog is enabled. These settings
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may be overridden at boot time with
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the kernel command line options
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<literal>systemd.journald.forward_to_syslog=</literal>,
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<literal>systemd.journald.forward_to_kmsg=</literal>
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and
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<literal>systemd.journald.forward_to_console=</literal>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>MaxLevelStore=</varname></term>
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<term><varname>MaxLevelSyslog=</varname></term>
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<term><varname>MaxLevelKMsg=</varname></term>
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<term><varname>MaxLevelConsole=</varname></term>
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<listitem><para>Controls the maximum
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log level of messages that are stored
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on disk, forwarded to syslog, kmsg or
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the console (if that is enabled, see
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above). As argument, takes one of
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<literal>emerg</literal>,
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<literal>alert</literal>,
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<literal>crit</literal>,
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<literal>err</literal>,
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<literal>warning</literal>,
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<literal>notice</literal>,
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<literal>info</literal>,
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<literal>debug</literal> or integer
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values in the range of 0..7 (corresponding
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to the same levels). Messages equal or below
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the log level specified are
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stored/forwarded, messages above are
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dropped. Defaults to
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<literal>debug</literal> for
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<varname>MaxLevelStore=</varname> and
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<varname>MaxLevelSyslog=</varname>, to
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ensure that the all messages are
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written to disk and forwarded to
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syslog. Defaults to
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<literal>notice</literal> for
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<varname>MaxLevelKMsg=</varname> and
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<literal>info</literal> for
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<varname>MaxLevelConsole=</varname>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>TTYPath=</varname></term>
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<listitem><para>Change the console TTY
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to use if
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<varname>ForwardToConsole=yes</varname>
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is used. Defaults to
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<filename>/dev/console</filename>.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-system.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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