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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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-
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- Copyright 2010 Lennart Poettering
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+<!-- SPDX-License-Identifier: LGPL-2.1+ -->
<refentry id="journald.conf"
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>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>
<refsect1>
<title>Description</title>
- <para>These files configure various parameters of the systemd
- journal service,
- <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
+ <para>These files configure various parameters of the systemd journal service,
+ <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
+ See
+ <citerefentry><refentrytitle>systemd.syntax</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ for a general description of the syntax.</para>
</refsect1>
<para>All options are configured in the
<literal>[Journal]</literal> section:</para>
- <variablelist>
+ <variablelist class='config-directives'>
<varlistentry>
<term><varname>Storage=</varname></term>
<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 before they
- are written to the file system.</para></listitem>
+ <listitem><para>Can take a boolean value. If enabled (the
+ default), data objects that shall be stored in the journal
+ and are larger than the default threshold of 512 bytes are
+ compressed before they are written to the file system. It
+ can also be set to a number of bytes to specify the
+ compression threshold directly. Suffixes like K, M, and G
+ can be used to specify larger units.</para></listitem>
</varlistentry>
<varlistentry>
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 limits. Defaults to 1000 messages in 30s.
+ with each other's limits. Defaults to 10000 messages in 30s.
The time specification for
<varname>RateLimitIntervalSec=</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>
+ set either value to 0.</para>
+
+ <para>If a service provides rate limits for itself through
+ <varname>LogRateLimitIntervalSec=</varname> and/or <varname>LogRateLimitBurst=</varname>
+ in <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ those values will override the settings specified here.</para>
+ </listitem>
</varlistentry>
<varlistentry>
subsequently something else causes the file system to fill up,
journald will stop using more space, but it will not be
removing existing files to reduce the footprint again,
- either.</para>
+ either. Also note that only archived files are deleted to reduce the
+ space occupied by journal files. This means that, in effect, there might
+ still be more space used than <varname>SystemMaxUse=</varname> or
+ <varname>RuntimeMaxUse=</varname> limit after a vacuuming operation is
+ complete.</para>
<para><varname>SystemMaxFileSize=</varname> and
<varname>RuntimeMaxFileSize=</varname> control how large
rotated journal files are kept as history.</para>
<para>Specify values in bytes or use K, M, G, T, P, E as
- units for the specified sizes (equal to 1024, 1024², ... bytes).
+ units for the specified sizes (equal to 1024, 1024², … bytes).
Note that size limits are enforced synchronously when journal
files are extended, and no explicit rotation step triggered by
time is needed.</para>
<listitem><para>The maximum time to store journal entries.
This controls whether journal files containing entries older
- then the specified time span are deleted. Normally, time-based
+ than the specified time span are deleted. Normally, time-based
deletion of old journal files should not be required as
size-based deletion with options such as
<varname>SystemMaxUse=</varname> should be sufficient to
seconds.</para></listitem>
</varlistentry>
-
<varlistentry>
<term><varname>SyncIntervalSec=</varname></term>
<term><varname>ForwardToConsole=</varname></term>
<term><varname>ForwardToWall=</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), to the system
- console, or sent as wall messages to all logged-in users.
- These options take boolean arguments. If forwarding to syslog
- is enabled but nothing reads messages from the socket,
- forwarding to syslog has no effect. By default, only
- forwarding to wall is enabled. These settings may be
- overridden at boot time with the kernel command line options
- <literal>systemd.journald.forward_to_syslog=</literal>,
- <literal>systemd.journald.forward_to_kmsg=</literal>,
- <literal>systemd.journald.forward_to_console=</literal>, and
- <literal>systemd.journald.forward_to_wall=</literal>. When
- forwarding to the console, the TTY to log to can be changed
- with <varname>TTYPath=</varname>, described
- below.</para></listitem>
+ <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), to
+ the system console, or sent as wall messages to all logged-in users. These
+ options take boolean arguments. If forwarding to syslog is enabled but nothing
+ reads messages from the socket, forwarding to syslog has no effect. By default,
+ only forwarding to wall is enabled. These settings may be overridden at boot time
+ with the kernel command line options
+ <literal>systemd.journald.forward_to_syslog</literal>,
+ <literal>systemd.journald.forward_to_kmsg</literal>,
+ <literal>systemd.journald.forward_to_console</literal>, and
+ <literal>systemd.journald.forward_to_wall</literal>. If the option name is
+ specified without <literal>=</literal> and the following argument, true is
+ assumed. Otherwise, the argument is parsed as a boolean. When forwarding to the
+ console, the TTY to log to can be changed with <varname>TTYPath=</varname>,
+ described below.</para></listitem>
</varlistentry>
<varlistentry>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>ReadKMsg=</varname></term>
+
+ <listitem><para>Takes a boolean value. If enabled (the
+ default), journal reads <filename>/dev/kmsg</filename>
+ messages generated by the kernel.</para></listitem>
+ </varlistentry>
+
<varlistentry>
<term><varname>TTYPath=</varname></term>
<filename>/dev/console</filename>.</para></listitem>
</varlistentry>
+ <varlistentry>
+ <term><varname>LineMax=</varname></term>
+
+ <listitem><para>The maximum line length to permit when converting stream logs into record logs. When a systemd
+ unit's standard output/error are connected to the journal via a stream socket, the data read is split into
+ individual log records at newline (<literal>\n</literal>, ASCII 10) and NUL characters. If no such delimiter is
+ read for the specified number of bytes a hard log record boundary is artificially inserted, breaking up overly
+ long lines into multiple log records. Selecting overly large values increases the possible memory usage of the
+ Journal daemon for each stream client, as in the worst case the journal daemon needs to buffer the specified
+ number of bytes in memory before it can flush a new log record to disk. Also note that permitting overly large
+ line maximum line lengths affects compatibility with traditional log protocols as log records might not fit
+ anymore into a single <constant>AF_UNIX</constant> or <constant>AF_INET</constant> datagram. Takes a size in
+ bytes. If the value is suffixed with K, M, G or T, the specified size is parsed as Kilobytes, Megabytes,
+ Gigabytes, or Terabytes (with the base 1024), respectively. Defaults to 48K, which is relatively large but
+ still small enough so that log records likely fit into network datagrams along with extra room for
+ metadata. Note that values below 79 are not accepted and will be bumped to 79.</para></listitem>
+ </varlistentry>
+
</variablelist>
</refsect1>
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