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315 lines
12 KiB
XML
315 lines
12 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 2012 Zbigniew Jędrzejewski-Szmek
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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-journal-remote" conditional='HAVE_MICROHTTPD'>
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<refentryinfo>
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<title>systemd-journal-remote</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>Zbigniew</firstname>
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<surname>Jędrzejewski-Szmek</surname>
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<email>zbyszek@in.waw.pl</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-journal-remote</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-journal-remote</refname>
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<refpurpose>Stream journal messages over the network</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>systemd-journal-remote</command>
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<arg choice="opt" rep="repeat">OPTIONS</arg>
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<arg choice="opt" rep="norepeat">-o/--output=DIR|FILE</arg>
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<arg choice="opt" rep="repeat">SOURCES</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>
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<filename>systemd-journal-remote</filename> is a command to
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receive serialized journal events and store them to the journal.
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Input streams must be in the
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<ulink url="http://www.freedesktop.org/wiki/Software/systemd/export">
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Journal Export Format
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</ulink>,
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i.e. like the output from
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<command>journalctl --output=export</command>.
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</para>
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</refsect1>
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<refsect1>
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<title>Sources</title>
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<para>
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Sources can be either "active"
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(<command>systemd-journal-remote</command> requests and pulls
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the data), or "passive"
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(<command>systemd-journal-remote</command> waits for a
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connection and then receives events pushed by the other side).
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</para>
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<para>
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<command>systemd-journal-remote</command> can read more than one
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event stream at a time. They will be interleaved in the output
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file. In case of "active" connections, each "source" is one
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stream, and in case of "passive" connections, each connection can
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result in a separate stream. Sockets can be configured in
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"accept" mode (i.e. only one connection), or "listen" mode (i.e.
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multiple connections, each resulting in a stream).
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</para>
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<para>
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When there are no more connections, and no more can be created
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(there are no listening sockets), then
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<command>systemd-journal-remote</command> will exit.
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</para>
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<para>Active sources can be specified in the following
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ways:</para>
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<variablelist>
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<varlistentry>
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<listitem><para>When <option>-</option> is given as a
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positional argument, events will be read from standard input.
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Other positional arguments will be treated as filenames
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to open and read from.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--url=<replaceable>ADDRESS</replaceable></option></term>
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<listitem><para>With the
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<option>--url=<replaceable>ADDRESS</replaceable></option> option,
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events will be retrieved using HTTP from
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<replaceable>ADDRESS</replaceable>. This URL should refer to the
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root of a remote
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<citerefentry><refentrytitle>systemd-journal-gatewayd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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instance (e.g. <ulink>http://some.host:19531/</ulink> or
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<ulink>https://some.host:19531/</ulink>).</para></listitem>
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</varlistentry>
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</variablelist>
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<para>Passive sources can be specified in the following
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ways:</para>
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<variablelist>
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<varlistentry>
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<term><option>--listen-raw=<replaceable>ADDRESS</replaceable></option></term>
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<listitem><para><replaceable>ADDRESS</replaceable> must be an
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address suitable for <option>ListenStream=</option> (cf.
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<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
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<command>systemd-journal-remote</command> will listen on this
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socket for connections. Each connection is expected to be a
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stream of journal events.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--listen-http=<replaceable>ADDRESS</replaceable></option></term>
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<term><option>--listen-https=<replaceable>ADDRESS</replaceable></option></term>
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<listitem><para><replaceable>ADDRESS</replaceable> must be
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either a negative integer, in which case it will be
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interpreted as the (negated) file descriptor number, or an
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address suitable for <option>ListenStream=</option> (c.f.
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<citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
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In the first case, matching file descriptor must be inherited
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through
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<varname>$LISTEN_FDS</varname>/<varname>$LISTEN_PID</varname>.
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In the second case, an HTTP or HTTPS server will be spawned on
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this port, respectively for <option>--listen-http</option> and
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<option>--listen-https</option>. Currenntly, only POST requests
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to <filename>/upload</filename> with <literal>Content-Type:
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application/vnd.fdo.journal</literal> are supported.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$LISTEN_FDS</varname></term>
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<listitem><para><command>systemd-journal-remote</command>
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supports the
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<varname>$LISTEN_FDS</varname>/<varname>$LISTEN_PID</varname>
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protocol. Open sockets inherited through socket activation
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behave like those opened with <option>--listen-raw=</option>
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described above, unless they are specified as an argument in
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<option>--listen-http=-<replaceable>n</replaceable></option>
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or
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<option>--listen-https=-<replaceable>n</replaceable></option>
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above. In the latter case, an HTTP or HTTPS server will be
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spawned using this descriptor and connections must be made
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over the HTTP protocol.</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>Sinks</title>
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<para>The location of the output journal can be specified
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with <option>-o</option> or <option>--output=</option>.
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</para>
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<variablelist>
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<varlistentry>
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<term><option>--output=<replaceable>FILE</replaceable></option></term>
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<listitem><para>Will write to this journal. The filename must
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end with <filename>.journal</filename>. The file will be
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created if it does not exist. If necessary (journal file
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full, or corrupted), the file will be renamed following normal
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journald rules and a new journal file will be created in its
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stead.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--output=<replaceable>DIR</replaceable></option></term>
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<listitem><para>Will create journal files underneath directory
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<replaceable>DIR</replaceable>. The directory must exist. If
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necessary (journal files over size, or corrupted), journal
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files will be rotated following normal journald rules. Names
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of files underneath <replaceable>DIR</replaceable> will be
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generated using the rules described below.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>If <option>--output=</option> is not used, the output directory
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<filename>/var/log/journal/<replaceable>machine-id</replaceable>/</filename>
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will be used, where <replaceable>machine-id</replaceable> is the
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identifier of the current system (see
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<citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
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In case the output file is not specified, journal files will be
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created underneath the selected directory. Files will be called
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<filename>remote-<replaceable>variable</replaceable>.journal</filename>,
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where the <replaceable>variable</replaceable> part is generated
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based on what passive and active sources are specified. It is
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recommended to give a full output filename.</para>
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<para>In case of "active" sources, if the hostname is known, it
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will be used in the <replaceable>variable</replaceable> part.
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Otherwise, local address and port number will be used, or
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<literal>stdin</literal> for events passed over standard
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input, and <literal>multiple</literal> if more than one source
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is specified.</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>--help</option></term>
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<term><option>-h</option></term>
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<listitem><para>Print a short help
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text and exit.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--version</option></term>
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<listitem><para>Print a short version
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string and exit.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--compress</option></term>
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<term><option>--no-compress</option></term>
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<listitem><para>Compress or not, respectively, the data in the
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journal using XZ.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--seal</option></term>
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<term><option>--no-seal</option></term>
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<listitem><para>Periodically sign or not, respectively, the
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data in the journal using Forward Secure Sealing.
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</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--getter=<replaceable>PROG --option1 --option2</replaceable></option></term>
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<listitem><para>Program to invoke to retrieve data. The journal
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event stream must be generated on standard output.</para>
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<para>Examples:</para>
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<programlisting>--getter='curl "-HAccept: application/vnd.fdo.journal" https://some.host:19531/'</programlisting>
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<programlisting>--getter='wget --header="Accept: application/vnd.fdo.journal" -O- https://some.host:19531/'</programlisting>
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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>Examples</title>
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<para>Copy local journal events to a different journal directory:
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<programlisting>
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journalctl -o export | systemd-journal-remote -o /tmp/dir -
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</programlisting>
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</para>
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<para>Retrieve events from a remote
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<citerefentry><refentrytitle>systemd-journal-gatewayd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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instance and store them in
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<filename>/var/log/journal/some.host/remote-some~host.journal</filename>:
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<programlisting>
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systemd-journal-remote --url http://some.host:19531/
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</programlisting>
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</para>
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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>journalctl</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>systemd-journal-gatewayd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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</para>
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</refsect1>
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</refentry>
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