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12b42c7667
This did not really work out as we had hoped. Trying to do this upstream introduced several problems that probably makes it better suited as a downstream patch after all. At any rate, it is not releaseable in the current state, so we at least need to revert this before the release. * by adjusting the path to binaries, but not do the same thing to the search path we end up with inconsistent man-pages. Adjusting the search path too would be quite messy, and it is not at all obvious that this is worth the effort, but at any rate it would have to be done before we could ship this. * this means that distributed man-pages does not make sense as they depend on config options, and for better or worse we are still distributing man pages, so that is something that definitely needs sorting out before we could ship with this patch. * we have long held that split-usr is only minimally supported in order to boot, and something we hope will eventually go away. So before we start adding even more magic/effort in order to make this work nicely, we should probably question if it makes sense at all.
251 lines
10 KiB
XML
251 lines
10 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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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="systemd-journald.service">
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<refentryinfo>
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<title>systemd-journald.service</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>systemd-journald.service</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-journald.service</refname>
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<refname>systemd-journald.socket</refname>
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<refname>systemd-journald-dev-log.socket</refname>
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<refname>systemd-journald</refname>
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<refpurpose>Journal service</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd-journald.service</filename></para>
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<para><filename>systemd-journald.socket</filename></para>
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<para><filename>systemd-journald-dev-log.socket</filename></para>
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<para><filename>/usr/lib/systemd/systemd-journald</filename></para>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><filename>systemd-journald</filename> is a system service
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that collects and stores logging data. It creates and maintains
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structured, indexed journals based on logging information that is
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received from a variety of sources:</para>
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<itemizedlist>
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<listitem><para>Kernel log messages, via kmsg</para></listitem>
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<listitem><para>Simple system log messages, via the libc
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<citerefentry project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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call</para></listitem>
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<listitem><para>Structured system log messages via the native
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Journal API, see
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<citerefentry><refentrytitle>sd_journal_print</refentrytitle><manvolnum>4</manvolnum></citerefentry></para></listitem>
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<listitem><para>Standard output and standard error of system
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services</para></listitem>
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<listitem><para>Audit records, via the audit
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subsystem</para></listitem>
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</itemizedlist>
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<para>The daemon will implicitly collect numerous metadata fields
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for each log messages in a secure and unfakeable way. See
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<citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for more information about the collected metadata.
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</para>
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<para>Log data collected by the journal is primarily text-based
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but can also include binary data where necessary. All objects
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stored in the journal can be up to 2^64-1 bytes in size.</para>
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<para>By default, the journal stores log data in
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<filename>/run/log/journal/</filename>. Since
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<filename>/run/</filename> is volatile, log data is lost at
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reboot. To make the data persistent, it is sufficient to create
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<filename>/var/log/journal/</filename> where
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<filename>systemd-journald</filename> will then store the
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data.</para>
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<para><filename>systemd-journald</filename> will forward all
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received log messages to the
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<constant>AF_UNIX</constant>/<constant>SOCK_DGRAM</constant>
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socket <filename>/run/systemd/journal/syslog</filename>, if it
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exists, which may be used by Unix syslog daemons to process the
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data further.</para>
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<para>See
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<citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for information about the configuration of this service.</para>
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</refsect1>
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<refsect1>
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<title>Signals</title>
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<variablelist>
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<varlistentry>
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<term>SIGUSR1</term>
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<listitem><para>Request that journal data from
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<filename>/run/</filename> is flushed to
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<filename>/var/</filename> in order to make it persistent (if
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this is enabled). This must be used after
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<filename>/var/</filename> is mounted, as otherwise log data
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from <filename>/run</filename> is never flushed to
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<filename>/var</filename> regardless of the
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configuration.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term>SIGUSR2</term>
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<listitem><para>Request immediate rotation of the journal
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files.</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>Kernel Command Line</title>
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<para>A few configuration parameters from
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<filename>journald.conf</filename> may be overridden on the kernel
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command line:</para>
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<variablelist class='kernel-commandline-options'>
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<varlistentry>
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<term><varname>systemd.journald.forward_to_syslog=</varname></term>
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<term><varname>systemd.journald.forward_to_kmsg=</varname></term>
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<term><varname>systemd.journald.forward_to_console=</varname></term>
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<term><varname>systemd.journald.forward_to_wall=</varname></term>
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<listitem><para>Enables/disables forwarding of collected log
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messages to syslog, the kernel log buffer, the system console
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or wall.
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</para>
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<para>See
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<citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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for information about these settings.</para>
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</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>Access Control</title>
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<para>Journal files are, by default, owned and readable by the
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<literal>systemd-journal</literal> system group but are not
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writable. Adding a user to this group thus enables her/him to read
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the journal files.</para>
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<para>By default, each logged in user will get her/his own set of
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journal files in <filename>/var/log/journal/</filename>. These
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files will not be owned by the user, however, in order to avoid
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that the user can write to them directly. Instead, file system
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ACLs are used to ensure the user gets read access only.</para>
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<para>Additional users and groups may be granted access to journal
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files via file system access control lists (ACL). Distributions
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and administrators may choose to grant read access to all members
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of the <literal>wheel</literal> and <literal>adm</literal> system
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groups with a command such as the following:</para>
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<programlisting># setfacl -Rnm g:wheel:rx,d:g:wheel:rx,g:adm:rx,d:g:adm:rx /var/log/journal/</programlisting>
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<para>Note that this command will update the ACLs both for
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existing journal files and for future journal files created in the
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<filename>/var/log/journal/</filename> directory.</para>
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</refsect1>
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<refsect1>
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<title>Files</title>
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<variablelist>
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<varlistentry>
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<term><filename>/etc/systemd/journald.conf</filename></term>
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<listitem><para>Configure
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<command>systemd-journald</command>
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behaviour. See
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<citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/run/log/journal/<replaceable>machine-id</replaceable>/*.journal</filename></term>
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<term><filename>/run/log/journal/<replaceable>machine-id</replaceable>/*.journal~</filename></term>
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<term><filename>/var/log/journal/<replaceable>machine-id</replaceable>/*.journal</filename></term>
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<term><filename>/var/log/journal/<replaceable>machine-id</replaceable>/*.journal~</filename></term>
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<listitem><para><command>systemd-journald</command> writes
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entries to files in
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<filename>/run/log/journal/<replaceable>machine-id</replaceable>/</filename>
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or
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<filename>/var/log/journal/<replaceable>machine-id</replaceable>/</filename>
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with the <literal>.journal</literal> suffix. If the daemon is
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stopped uncleanly, or if the files are found to be corrupted,
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they are renamed using the <literal>.journal~</literal>
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suffix, and <command>systemd-journald</command> starts writing
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to a new file. <filename>/run</filename> is used when
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<filename>/var/log/journal</filename> is not available, or
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when <option>Storage=volatile</option> is set in the
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<citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
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configuration file. </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>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd-journal</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-coredump</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry project='die-net'><refentrytitle>setfacl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sd_journal_print</refentrytitle><manvolnum>4</manvolnum></citerefentry>,
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<command>pydoc systemd.journal</command>.
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</para>
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</refsect1>
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</refentry>
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