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49805b3d81
When dealing with a large number of template instances, for example when launching daemons per VRF, it is hard for operators to correlate log lines to arguments. Add a new with-unit mode which, if available, prefixes unit and user unit names when displaying its log messages instead of the syslog identifier. It will also use the full timestamp with timezones, like the short-full mode.
996 lines
42 KiB
XML
996 lines
42 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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SPDX-License-Identifier: LGPL-2.1+
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This file is part of systemd.
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Copyright 2012 Lennart Poettering
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-->
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<refentry id="journalctl"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>journalctl</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>journalctl</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>journalctl</refname>
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<refpurpose>Query the systemd journal</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>journalctl</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="opt" rep="repeat">MATCHES</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>journalctl</command> may be used to query the
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contents of the
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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journal as written by
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<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
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<para>If called without parameters, it will show the full
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contents of the journal, starting with the oldest entry
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collected.</para>
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<para>If one or more match arguments are passed, the output is
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filtered accordingly. A match is in the format
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<literal>FIELD=VALUE</literal>,
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e.g. <literal>_SYSTEMD_UNIT=httpd.service</literal>, referring
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to the components of a structured journal entry. See
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<citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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for a list of well-known fields. If multiple matches are
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specified matching different fields, the log entries are
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filtered by both, i.e. the resulting output will show only
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entries matching all the specified matches of this kind. If two
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matches apply to the same field, then they are automatically
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matched as alternatives, i.e. the resulting output will show
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entries matching any of the specified matches for the same
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field. Finally, the character <literal>+</literal> may appear
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as a separate word between other terms on the command line. This
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causes all matches before and after to be combined in a
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disjunction (i.e. logical OR).</para>
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<para>It is also possible to filter the entries by specifying an
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absolute file path as an argument. The file path may be a file or
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a symbolic link and the file must exist at the time of the query. If a
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file path refers to an executable binary, an <literal>_EXE=</literal>
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match for the canonicalized binary path is added to the query. If a
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file path refers to an executable script, a <literal>_COMM=</literal>
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match for the script name is added to the query. If a file path
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refers to a device node, <literal>_KERNEL_DEVICE=</literal> matches for
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the kernel name of the device and for each of its ancestor devices is
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added to the query. Symbolic links are dereferenced, kernel names are
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synthesized, and parent devices are identified from the environment at
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the time of the query. In general, a device node is the best proxy for
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an actual device, as log entries do not usually contain fields that
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identify an actual device. For the resulting log entries to be correct
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for the actual device, the relevant parts of the environment at the time
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the entry was logged, in particular the actual device corresponding to
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the device node, must have been the same as those at the time of the
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query. Because device nodes generally change their corresponding devices
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across reboots, specifying a device node path causes the resulting
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entries to be restricted to those from the current boot.</para>
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<para>Additional constraints may be added using options
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<option>--boot</option>, <option>--unit=</option>, etc., to
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further limit what entries will be shown (logical AND).</para>
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<para>Output is interleaved from all accessible journal files,
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whether they are rotated or currently being written, and
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regardless of whether they belong to the system itself or are
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accessible user journals.</para>
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<para>The set of journal files which will be used can be
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modified using the <option>--user</option>,
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<option>--system</option>, <option>--directory</option>, and
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<option>--file</option> options, see below.</para>
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<para>All users are granted access to their private per-user
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journals. However, by default, only root and users who are
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members of a few special groups are granted access to the system
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journal and the journals of other users. Members of the groups
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<literal>systemd-journal</literal>, <literal>adm</literal>, and
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<literal>wheel</literal> can read all journal files. Note
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that the two latter groups traditionally have additional
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privileges specified by the distribution. Members of the
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<literal>wheel</literal> group can often perform administrative
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tasks.</para>
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<para>The output is paged through <command>less</command> by
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default, and long lines are "truncated" to screen width. The
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hidden part can be viewed by using the left-arrow and
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right-arrow keys. Paging can be disabled; see the
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<option>--no-pager</option> option and the "Environment" section
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below.</para>
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<para>When outputting to a tty, lines are colored according to
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priority: lines of level ERROR and higher are colored red; lines
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of level NOTICE and higher are highlighted; other lines are
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displayed normally.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following options are understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>--no-full</option></term>
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<term><option>--full</option></term>
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<term><option>-l</option></term>
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<listitem><para>Ellipsize fields when they do not fit in
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available columns. The default is to show full fields,
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allowing them to wrap or be truncated by the pager, if one
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is used.</para>
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<para>The old options
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<option>-l</option>/<option>--full</option> are not useful
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anymore, except to undo <option>--no-full</option>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-a</option></term>
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<term><option>--all</option></term>
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<listitem><para>Show all fields in full, even if they
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include unprintable characters or are very
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long.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-f</option></term>
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<term><option>--follow</option></term>
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<listitem><para>Show only the most recent journal entries,
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and continuously print new entries as they are appended to
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the journal.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-e</option></term>
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<term><option>--pager-end</option></term>
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<listitem><para>Immediately jump to the end of the journal
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inside the implied pager tool. This implies
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<option>-n1000</option> to guarantee that the pager will not
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buffer logs of unbounded size. This may be overridden with
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an explicit <option>-n</option> with some other numeric
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value, while <option>-nall</option> will disable this cap.
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Note that this option is only supported for the
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<citerefentry project='man-pages'><refentrytitle>less</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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pager.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-n</option></term>
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<term><option>--lines=</option></term>
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<listitem><para>Show the most recent journal events and
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limit the number of events shown. If
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<option>--follow</option> is used, this option is
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implied. The argument is a positive integer or
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<literal>all</literal> to disable line limiting. The default
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value is 10 if no argument is given.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-tail</option></term>
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<listitem><para>Show all stored output lines, even in follow
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mode. Undoes the effect of <option>--lines=</option>.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-r</option></term>
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<term><option>--reverse</option></term>
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<listitem><para>Reverse output so that the newest entries
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are displayed first.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-o</option></term>
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<term><option>--output=</option></term>
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<listitem><para>Controls the formatting of the journal
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entries that are shown. Takes one of the following
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options:</para>
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<variablelist>
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<varlistentry>
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<term>
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<option>short</option>
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</term>
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<listitem>
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<para>is the default and generates an output that is
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mostly identical to the formatting of classic syslog
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files, showing one line per journal entry.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>short-full</option>
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</term>
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<listitem>
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<para>is very similar, but shows timestamps in the format the <option>--since=</option> and
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<option>--until=</option> options accept. Unlike the timestamp information shown in
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<option>short</option> output mode this mode includes weekday, year and timezone information in the
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output, and is locale-independent.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>short-iso</option>
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</term>
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<listitem>
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<para>is very similar, but shows ISO 8601 wallclock
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timestamps.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>short-iso-precise</option>
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</term>
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<listitem>
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<para>as for <option>short-iso</option> but includes full
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microsecond precision.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>short-precise</option>
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</term>
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<listitem>
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<para>is very similar, but shows classic syslog timestamps
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with full microsecond precision.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>short-monotonic</option>
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</term>
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<listitem>
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<para>is very similar, but shows monotonic timestamps
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instead of wallclock timestamps.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>short-unix</option>
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</term>
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<listitem>
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<para>is very similar, but shows seconds passed since January 1st 1970 UTC instead of wallclock
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timestamps ("UNIX time"). The time is shown with microsecond accuracy.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>verbose</option>
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</term>
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<listitem>
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<para>shows the full-structured entry items with all
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fields.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>export</option>
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</term>
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<listitem>
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<para>serializes the journal into a binary (but mostly
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text-based) stream suitable for backups and network
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transfer (see
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<ulink url="https://www.freedesktop.org/wiki/Software/systemd/export">Journal Export Format</ulink>
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for more information). To import the binary stream back
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into native journald format use
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<citerefentry><refentrytitle>systemd-journal-remote</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>json</option>
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</term>
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<listitem>
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<para>formats entries as JSON data structures, one per
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line (see
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<ulink url="https://www.freedesktop.org/wiki/Software/systemd/json">Journal JSON Format</ulink>
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for more information).</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>json-pretty</option>
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</term>
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<listitem>
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<para>formats entries as JSON data structures, but
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formats them in multiple lines in order to make them
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more readable by humans.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>json-sse</option>
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</term>
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<listitem>
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<para>formats entries as JSON data structures, but wraps
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them in a format suitable for
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<ulink url="https://developer.mozilla.org/en-US/docs/Server-sent_events/Using_server-sent_events">Server-Sent Events</ulink>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>cat</option>
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</term>
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<listitem>
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<para>generates a very terse output, only showing the
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actual message of each journal entry with no metadata,
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not even a timestamp.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>with-unit</option>
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</term>
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<listitem>
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<para>similar to short-full, but prefixes the unit and
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user unit names instead of the traditional syslog
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identifier. Useful when using templated instances, as it
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will include the arguments in the unit names.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--output-fields=</option></term>
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<listitem><para>A comma separated list of the fields which should
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be included in the output. This only has an effect for the output modes
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which would normally show all fields (<option>verbose</option>,
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<option>export</option>, <option>json</option>,
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<option>json-pretty</option>, and <option>json-sse</option>). The
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<literal>__CURSOR</literal>, <literal>__REALTIME_TIMESTAMP</literal>,
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<literal>__MONOTONIC_TIMESTAMP</literal>, and
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<literal>_BOOT_ID</literal> fields are always
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printed.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--utc</option></term>
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<listitem><para>Express time in Coordinated Universal Time
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(UTC).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--no-hostname</option></term>
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<listitem><para>Don't show the hostname field of log messages originating from the local host. This switch only
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has an effect on the <option>short</option> family of output modes (see above).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-x</option></term>
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<term><option>--catalog</option></term>
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<listitem><para>Augment log lines with explanation texts from
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the message catalog. This will add explanatory help texts to
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log messages in the output where this is available. These
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short help texts will explain the context of an error or log
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event, possible solutions, as well as pointers to support
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forums, developer documentation, and any other relevant
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manuals. Note that help texts are not available for all
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messages, but only for selected ones. For more information on
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the message catalog, please refer to the
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<ulink url="https://www.freedesktop.org/wiki/Software/systemd/catalog">Message Catalog Developer Documentation</ulink>.</para>
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<para>Note: when attaching <command>journalctl</command>
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output to bug reports, please do <emphasis>not</emphasis> use
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<option>-x</option>.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-q</option></term>
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<term><option>--quiet</option></term>
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<listitem><para>Suppresses all informational messages
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(i.e. "-- Logs begin at …", "-- Reboot --"),
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any warning messages regarding
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inaccessible system journals when run as a normal
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user.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-m</option></term>
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<term><option>--merge</option></term>
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<listitem><para>Show entries interleaved from all available
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journals, including remote ones.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-b <optional><replaceable>ID</replaceable></optional><optional><replaceable>±offset</replaceable></optional></option></term>
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<term><option>--boot=<optional><replaceable>ID</replaceable></optional><optional><replaceable>±offset</replaceable></optional></option></term>
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||
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<listitem><para>Show messages from a specific boot. This will
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add a match for <literal>_BOOT_ID=</literal>.</para>
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<para>The argument may be empty, in which case logs for the
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current boot will be shown.</para>
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<para>If the boot ID is omitted, a positive
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<replaceable>offset</replaceable> will look up the boots
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starting from the beginning of the journal, and an
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equal-or-less-than zero <replaceable>offset</replaceable> will
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look up boots starting from the end of the journal. Thus,
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<constant>1</constant> means the first boot found in the
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journal in chronological order, <constant>2</constant> the
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second and so on; while <constant>-0</constant> is the last
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boot, <constant>-1</constant> the boot before last, and so
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on. An empty <replaceable>offset</replaceable> is equivalent
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to specifying <constant>-0</constant>, except when the current
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boot is not the last boot (e.g. because
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<option>--directory</option> was specified to look at logs
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from a different machine).</para>
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<para>If the 32-character <replaceable>ID</replaceable> is
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specified, it may optionally be followed by
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<replaceable>offset</replaceable> which identifies the boot
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relative to the one given by boot
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<replaceable>ID</replaceable>. Negative values mean earlier
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boots and positive values mean later boots. If
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<replaceable>offset</replaceable> is not specified, a value of
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zero is assumed, and the logs for the boot given by
|
||
<replaceable>ID</replaceable> are shown.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--list-boots</option></term>
|
||
|
||
<listitem><para>Show a tabular list of boot numbers (relative to
|
||
the current boot), their IDs, and the timestamps of the first
|
||
and last message pertaining to the boot.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>-k</option></term>
|
||
<term><option>--dmesg</option></term>
|
||
|
||
<listitem><para>Show only kernel messages. This implies
|
||
<option>-b</option> and adds the match
|
||
<literal>_TRANSPORT=kernel</literal>.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>-t</option></term>
|
||
<term><option>--identifier=<replaceable>SYSLOG_IDENTIFIER</replaceable></option></term>
|
||
|
||
<listitem><para>Show messages for the specified syslog
|
||
identifier
|
||
<replaceable>SYSLOG_IDENTIFIER</replaceable>.</para>
|
||
|
||
<para>This parameter can be specified multiple
|
||
times.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>-u</option></term>
|
||
<term><option>--unit=<replaceable>UNIT</replaceable>|<replaceable>PATTERN</replaceable></option></term>
|
||
|
||
<listitem><para>Show messages for the specified systemd unit
|
||
<replaceable>UNIT</replaceable> (such as a service unit), or
|
||
for any of the units matched by
|
||
<replaceable>PATTERN</replaceable>. If a pattern is
|
||
specified, a list of unit names found in the journal is
|
||
compared with the specified pattern and all that match are
|
||
used. For each unit name, a match is added for messages from
|
||
the unit
|
||
(<literal>_SYSTEMD_UNIT=<replaceable>UNIT</replaceable></literal>),
|
||
along with additional matches for messages from systemd and
|
||
messages about coredumps for the specified unit.</para>
|
||
|
||
<para>This parameter can be specified multiple times.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--user-unit=</option></term>
|
||
|
||
<listitem><para>Show messages for the specified user session
|
||
unit. This will add a match for messages from the unit
|
||
(<literal>_SYSTEMD_USER_UNIT=</literal> and
|
||
<literal>_UID=</literal>) and additional matches for messages
|
||
from session systemd and messages about coredumps for the
|
||
specified unit.</para>
|
||
|
||
<para>This parameter can be specified multiple times.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>-p</option></term>
|
||
<term><option>--priority=</option></term>
|
||
|
||
<listitem><para>Filter output by message priorities or
|
||
priority ranges. Takes either a single numeric or textual log
|
||
level (i.e. between 0/<literal>emerg</literal> and
|
||
7/<literal>debug</literal>), or a range of numeric/text log
|
||
levels in the form FROM..TO. The log levels are the usual
|
||
syslog log levels as documented in
|
||
<citerefentry project='man-pages'><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
|
||
i.e. <literal>emerg</literal> (0),
|
||
<literal>alert</literal> (1), <literal>crit</literal> (2),
|
||
<literal>err</literal> (3), <literal>warning</literal> (4),
|
||
<literal>notice</literal> (5), <literal>info</literal> (6),
|
||
<literal>debug</literal> (7). If a single log level is
|
||
specified, all messages with this log level or a lower (hence
|
||
more important) log level are shown. If a range is specified,
|
||
all messages within the range are shown, including both the
|
||
start and the end value of the range. This will add
|
||
<literal>PRIORITY=</literal> matches for the specified
|
||
priorities.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>-g</option></term>
|
||
<term><option>--grep=</option></term>
|
||
|
||
<listitem><para>Filter output to entries where the <varname>MESSAGE=</varname>
|
||
field matches the specified regular expression. PERL-compatible regular expressions
|
||
are used, see
|
||
<citerefentry><refentrytitle>pcre2pattern</refentrytitle><manvolnum>3</manvolnum></citerefentry>
|
||
for a detailed description of the syntax.</para>
|
||
|
||
<para>If the pattern is all lowercase, matching is case insensitive.
|
||
Otherwise, matching is case sensitive. This can be overridden with the
|
||
<option>--case-sensitive</option> option, see below.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--case-sensitive<optional>=BOOLEAN</optional></option></term>
|
||
|
||
<listitem><para>Make pattern matching case sensitive or case insenstive.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>-c</option></term>
|
||
<term><option>--cursor=</option></term>
|
||
|
||
<listitem><para>Start showing entries from the location in the
|
||
journal specified by the passed cursor.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--after-cursor=</option></term>
|
||
|
||
<listitem><para>Start showing entries from the location in the
|
||
journal <emphasis>after</emphasis> the location specified by
|
||
the passed cursor. The cursor is shown when the
|
||
<option>--show-cursor</option> option is used.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--show-cursor</option></term>
|
||
|
||
<listitem><para>The cursor is shown after the last entry after
|
||
two dashes:</para>
|
||
<programlisting>-- cursor: s=0639…</programlisting>
|
||
<para>The format of the cursor is private
|
||
and subject to change.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>-S</option></term>
|
||
<term><option>--since=</option></term>
|
||
<term><option>-U</option></term>
|
||
<term><option>--until=</option></term>
|
||
|
||
<listitem><para>Start showing entries on or newer than the specified date, or on or older than the specified
|
||
date, respectively. Date specifications should be of the format <literal>2012-10-30 18:17:16</literal>. If the
|
||
time part is omitted, <literal>00:00:00</literal> is assumed. If only the seconds component is omitted,
|
||
<literal>:00</literal> is assumed. If the date component is omitted, the current day is assumed. Alternatively
|
||
the strings <literal>yesterday</literal>, <literal>today</literal>, <literal>tomorrow</literal> are understood,
|
||
which refer to 00:00:00 of the day before the current day, the current day, or the day after the current day,
|
||
respectively. <literal>now</literal> refers to the current time. Finally, relative times may be specified,
|
||
prefixed with <literal>-</literal> or <literal>+</literal>, referring to times before or after the current
|
||
time, respectively. For complete time and date specification, see
|
||
<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>. Note that
|
||
<option>--output=short-full</option> prints timestamps that follow precisely this format.
|
||
</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>-F</option></term>
|
||
<term><option>--field=</option></term>
|
||
|
||
<listitem><para>Print all possible data values the specified
|
||
field can take in all entries of the journal.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>-N</option></term>
|
||
<term><option>--fields</option></term>
|
||
|
||
<listitem><para>Print all field names currently used in all entries of the journal.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--system</option></term>
|
||
<term><option>--user</option></term>
|
||
|
||
<listitem><para>Show messages from system services and the
|
||
kernel (with <option>--system</option>). Show messages from
|
||
service of current user (with <option>--user</option>). If
|
||
neither is specified, show all messages that the user can see.
|
||
</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>-M</option></term>
|
||
<term><option>--machine=</option></term>
|
||
|
||
<listitem><para>Show messages from a running, local
|
||
container. Specify a container name to connect to.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>-D <replaceable>DIR</replaceable></option></term>
|
||
<term><option>--directory=<replaceable>DIR</replaceable></option></term>
|
||
|
||
<listitem><para>Takes a directory path as argument. If
|
||
specified, journalctl will operate on the specified journal
|
||
directory <replaceable>DIR</replaceable> instead of the
|
||
default runtime and system journal paths.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--file=<replaceable>GLOB</replaceable></option></term>
|
||
|
||
<listitem><para>Takes a file glob as an argument. If
|
||
specified, journalctl will operate on the specified journal
|
||
files matching <replaceable>GLOB</replaceable> instead of the
|
||
default runtime and system journal paths. May be specified
|
||
multiple times, in which case files will be suitably
|
||
interleaved.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--root=<replaceable>ROOT</replaceable></option></term>
|
||
|
||
<listitem><para>Takes a directory path as an argument. If
|
||
specified, journalctl will operate on journal directories and catalog file hierarchy
|
||
underneath the specified directory instead of the root
|
||
directory (e.g. <option>--update-catalog</option> will create
|
||
<filename><replaceable>ROOT</replaceable>/var/lib/systemd/catalog/database</filename>,
|
||
and journal files under <filename><replaceable>ROOT</replaceable>/run/journal</filename>
|
||
or <filename><replaceable>ROOT</replaceable>/var/log/journal</filename> will be displayed).
|
||
</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--new-id128</option></term>
|
||
|
||
<listitem><para>Instead of showing journal contents, generate
|
||
a new 128-bit ID suitable for identifying messages. This is
|
||
intended for usage by developers who need a new identifier for
|
||
a new message they introduce and want to make
|
||
recognizable. This will print the new ID in four different
|
||
formats which can be copied into source code or similar.
|
||
</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--header</option></term>
|
||
|
||
<listitem><para>Instead of showing journal contents, show
|
||
internal header information of the journal fields
|
||
accessed.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--disk-usage</option></term>
|
||
|
||
<listitem><para>Shows the current disk usage of all journal
|
||
files. This shows the sum of the disk usage of all archived
|
||
and active journal files.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--vacuum-size=</option></term>
|
||
<term><option>--vacuum-time=</option></term>
|
||
<term><option>--vacuum-files=</option></term>
|
||
|
||
<listitem><para>Removes the oldest archived journal files until the disk
|
||
space they use falls below the specified size (specified with
|
||
the usual <literal>K</literal>, <literal>M</literal>,
|
||
<literal>G</literal> and <literal>T</literal> suffixes), or all
|
||
archived journal files contain no data older than the specified
|
||
timespan (specified with the usual <literal>s</literal>,
|
||
<literal>m</literal>, <literal>h</literal>,
|
||
<literal>days</literal>, <literal>months</literal>,
|
||
<literal>weeks</literal> and <literal>years</literal> suffixes),
|
||
or no more than the specified number of separate journal files
|
||
remain. Note that running <option>--vacuum-size=</option> has
|
||
only an indirect effect on the output shown by
|
||
<option>--disk-usage</option>, as the latter includes active
|
||
journal files, while the vacuuming operation only operates
|
||
on archived journal files. Similarly,
|
||
<option>--vacuum-files=</option> might not actually reduce the
|
||
number of journal files to below the specified number, as it
|
||
will not remove active journal
|
||
files. <option>--vacuum-size=</option>,
|
||
<option>--vacuum-time=</option> and
|
||
<option>--vacuum-files=</option> may be combined in a single
|
||
invocation to enforce any combination of a size, a time and a
|
||
number of files limit on the archived journal
|
||
files. Specifying any of these three parameters as zero is
|
||
equivalent to not enforcing the specific limit, and is thus
|
||
redundant.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--list-catalog
|
||
<optional><replaceable>128-bit-ID…</replaceable></optional>
|
||
</option></term>
|
||
|
||
<listitem><para>List the contents of the message catalog as a
|
||
table of message IDs, plus their short description strings.
|
||
</para>
|
||
|
||
<para>If any <replaceable>128-bit-ID</replaceable>s are
|
||
specified, only those entries are shown.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--dump-catalog
|
||
<optional><replaceable>128-bit-ID…</replaceable></optional>
|
||
</option></term>
|
||
|
||
<listitem><para>Show the contents of the message catalog, with
|
||
entries separated by a line consisting of two dashes and the
|
||
ID (the format is the same as <filename>.catalog</filename>
|
||
files).</para>
|
||
|
||
<para>If any <replaceable>128-bit-ID</replaceable>s are
|
||
specified, only those entries are shown.</para>
|
||
</listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--update-catalog</option></term>
|
||
|
||
<listitem><para>Update the message catalog index. This command
|
||
needs to be executed each time new catalog files are
|
||
installed, removed, or updated to rebuild the binary catalog
|
||
index.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--setup-keys</option></term>
|
||
|
||
<listitem><para>Instead of showing journal contents, generate
|
||
a new key pair for Forward Secure Sealing (FSS). This will
|
||
generate a sealing key and a verification key. The sealing key
|
||
is stored in the journal data directory and shall remain on
|
||
the host. The verification key should be stored
|
||
externally. Refer to the <option>Seal=</option> option in
|
||
<citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
||
for information on Forward Secure Sealing and for a link to a
|
||
refereed scholarly paper detailing the cryptographic theory it
|
||
is based on.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--force</option></term>
|
||
|
||
<listitem><para>When <option>--setup-keys</option> is passed
|
||
and Forward Secure Sealing (FSS) has already been configured,
|
||
recreate FSS keys.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--interval=</option></term>
|
||
|
||
<listitem><para>Specifies the change interval for the sealing
|
||
key when generating an FSS key pair with
|
||
<option>--setup-keys</option>. Shorter intervals increase CPU
|
||
consumption but shorten the time range of undetectable journal
|
||
alterations. Defaults to 15min.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--verify</option></term>
|
||
|
||
<listitem><para>Check the journal file for internal
|
||
consistency. If the file has been generated with FSS enabled and
|
||
the FSS verification key has been specified with
|
||
<option>--verify-key=</option>, authenticity of the journal file
|
||
is verified.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--verify-key=</option></term>
|
||
|
||
<listitem><para>Specifies the FSS verification key to use for
|
||
the <option>--verify</option> operation.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--sync</option></term>
|
||
|
||
<listitem><para>Asks the journal daemon to write all yet
|
||
unwritten journal data to the backing file system and
|
||
synchronize all journals. This call does not return until the
|
||
synchronization operation is complete. This command guarantees
|
||
that any log messages written before its invocation are safely
|
||
stored on disk at the time it returns.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--flush</option></term>
|
||
|
||
<listitem><para>Asks the journal daemon to flush any log data
|
||
stored in <filename>/run/log/journal</filename> into
|
||
<filename>/var/log/journal</filename>, if persistent storage
|
||
is enabled. This call does not return until the operation is
|
||
complete. Note that this call is idempotent: the data is only
|
||
flushed from <filename>/run/log/journal</filename> into
|
||
<filename>/var/log/journal</filename> once during system
|
||
runtime, and this command exits cleanly without executing any
|
||
operation if this has already happened. This command
|
||
effectively guarantees that all data is flushed to
|
||
<filename>/var/log/journal</filename> at the time it
|
||
returns.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<varlistentry>
|
||
<term><option>--rotate</option></term>
|
||
|
||
<listitem><para>Asks the journal daemon to rotate journal
|
||
files. This call does not return until the rotation operation
|
||
is complete.</para></listitem>
|
||
</varlistentry>
|
||
|
||
<xi:include href="standard-options.xml" xpointer="help" />
|
||
<xi:include href="standard-options.xml" xpointer="version" />
|
||
<xi:include href="standard-options.xml" xpointer="no-pager" />
|
||
</variablelist>
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>Exit status</title>
|
||
|
||
<para>On success, 0 is returned; otherwise, a non-zero failure
|
||
code is returned.</para>
|
||
</refsect1>
|
||
|
||
<xi:include href="less-variables.xml" />
|
||
|
||
<refsect1>
|
||
<title>Examples</title>
|
||
|
||
<para>Without arguments, all collected logs are shown
|
||
unfiltered:</para>
|
||
|
||
<programlisting>journalctl</programlisting>
|
||
|
||
<para>With one match specified, all entries with a field matching
|
||
the expression are shown:</para>
|
||
|
||
<programlisting>journalctl _SYSTEMD_UNIT=avahi-daemon.service
|
||
journalctl _SYSTEMD_CGROUP=/user.slice/user-42.slice/session-c1.scope</programlisting>
|
||
|
||
<para>If two different fields are matched, only entries matching
|
||
both expressions at the same time are shown:</para>
|
||
|
||
<programlisting>journalctl _SYSTEMD_UNIT=avahi-daemon.service _PID=28097</programlisting>
|
||
|
||
<para>If two matches refer to the same field, all entries matching
|
||
either expression are shown:</para>
|
||
|
||
<programlisting>journalctl _SYSTEMD_UNIT=avahi-daemon.service _SYSTEMD_UNIT=dbus.service</programlisting>
|
||
|
||
<para>If the separator <literal>+</literal> is used, two
|
||
expressions may be combined in a logical OR. The following will
|
||
show all messages from the Avahi service process with the PID
|
||
28097 plus all messages from the D-Bus service (from any of its
|
||
processes):</para>
|
||
|
||
<programlisting>journalctl _SYSTEMD_UNIT=avahi-daemon.service _PID=28097 + _SYSTEMD_UNIT=dbus.service</programlisting>
|
||
|
||
<para>To show all fields emited <emphasis>by</emphasis> a unit and <emphasis>about</emphasis>
|
||
the unit, option <option>-u</option>/<option>--unit=</option> should be used.
|
||
<command>journalctl -u <replaceable>name</replaceable></command>
|
||
expands to a complex filter similar to
|
||
<programlisting>_SYSTEMD_UNIT=<replaceable>name</replaceable>.service
|
||
+ UNIT=<replaceable>name</replaceable>.service _PID=1
|
||
+ OBJECT_SYSTEMD_UNIT=<replaceable>name</replaceable>.service _UID=0
|
||
+ COREDUMP_UNIT=<replaceable>name</replaceable>.service _UID=0 MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1
|
||
</programlisting>
|
||
(see <citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>5</manvolnum></citerefentry>
|
||
for an explanation of those patterns).
|
||
</para>
|
||
|
||
<para>Show all logs generated by the D-Bus executable:</para>
|
||
|
||
<programlisting>journalctl /usr/bin/dbus-daemon</programlisting>
|
||
|
||
<para>Show all kernel logs from previous boot:</para>
|
||
|
||
<programlisting>journalctl -k -b -1</programlisting>
|
||
|
||
<para>Show a live log display from a system service
|
||
<filename>apache.service</filename>:</para>
|
||
|
||
<programlisting>journalctl -f -u apache</programlisting>
|
||
|
||
</refsect1>
|
||
|
||
<refsect1>
|
||
<title>See Also</title>
|
||
<para>
|
||
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>coredumpctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>journald.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>systemd.time</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>systemd-journal-remote.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
||
<citerefentry><refentrytitle>systemd-journal-upload.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
||
</para>
|
||
</refsect1>
|
||
</refentry>
|