systemd-journal-remote.xml 11.8 KB
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<?xml version='1.0'?> <!--*-nxml-*-->
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

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Copyright 2012 Zbigniew Jędrzejewski-Szmek

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<refentry id="systemd-journal-remote" conditional='HAVE_MICROHTTPD'>

  <refentryinfo>
    <title>systemd-journal-remote</title>
    <productname>systemd</productname>

    <authorgroup>
      <author>
        <contrib>Developer</contrib>
        <firstname>Zbigniew</firstname>
        <surname>Jędrzejewski-Szmek</surname>
        <email>zbyszek@in.waw.pl</email>
      </author>
    </authorgroup>
  </refentryinfo>

  <refmeta>
    <refentrytitle>systemd-journal-remote</refentrytitle>
    <manvolnum>8</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>systemd-journal-remote</refname>
    <refpurpose>Stream journal messages over the network</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <cmdsynopsis>
      <command>systemd-journal-remote</command>
      <arg choice="opt" rep="repeat">OPTIONS</arg>
      <arg choice="opt" rep="norepeat">-o/--output=DIR|FILE</arg>
      <arg choice="opt" rep="repeat">SOURCES</arg>
    </cmdsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para>
      <filename>systemd-journal-remote</filename> is a command to
      receive serialized journal events and store them to the journal.
      Input streams must be in the
      <ulink url="http://www.freedesktop.org/wiki/Software/systemd/export">
        Journal Export Format
      </ulink>,
      i.e. like the output from
      <command>journalctl --output=export</command>.
    </para>
  </refsect1>

  <refsect1>
    <title>Sources</title>

    <para>
      Sources can be either "active"
      (<command>systemd-journal-remote</command> requests and pulls
      the data), or "passive"
      (<command>systemd-journal-remote</command> waits for a
      connection and then receives events pushed by the other side).
    </para>

    <para>
      <command>systemd-journal-remote</command> can read more than one
      event stream at a time. They will be interleaved in the output
      file. In case of "active" connections, each "source" is one
      stream, and in case of "passive" connections, each connection can
      result in a separate stream. Sockets can be configured in
      "accept" mode (i.e. only one connection), or "listen" mode (i.e.
      multiple connections, each resulting in a stream).
    </para>

    <para>
      When there are no more connections, and no more can be created
      (there are no listening sockets), then
      <command>systemd-journal-remote</command> will exit.
    </para>

    <para>Active sources can be specified in the following
    ways:</para>

    <variablelist>
      <varlistentry>
        <listitem><para>When <option>-</option> is given as a
        positional argument, events will be read from standard input.
        Other positional arguments will be treated as filenames
        to open and read from.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--url=<replaceable>ADDRESS</replaceable></option></term>

        <listitem><para>With the
        <option>--url=<replaceable>ADDRESS</replaceable></option> option,
        events will be retrieved using HTTP from
        <replaceable>ADDRESS</replaceable>. This URL should refer to the
        root of a remote
        <citerefentry><refentrytitle>systemd-journal-gatewayd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
        instance (e.g. <ulink>http://some.host:19531/</ulink> or
        <ulink>https://some.host:19531/</ulink>).</para></listitem>
      </varlistentry>
    </variablelist>

    <para>Passive sources can be specified in the following
    ways:</para>

    <variablelist>
      <varlistentry>
        <term><option>--listen-raw=<replaceable>ADDRESS</replaceable></option></term>

        <listitem><para><replaceable>ADDRESS</replaceable> must be an
        address suitable for <option>ListenStream=</option> (cf.
        <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
        <command>systemd-journal-remote</command> will listen on this
        socket for connections. Each connection is expected to be a
        stream of journal events.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--listen-http=<replaceable>ADDRESS</replaceable></option></term>
        <term><option>--listen-https=<replaceable>ADDRESS</replaceable></option></term>

        <listitem><para><replaceable>ADDRESS</replaceable> must be
        either a negative integer, in which case it will be
        interpreted as the (negated) file descriptor number, or an
        address suitable for <option>ListenStream=</option> (c.f.
        <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
        In the first case, matching file descriptor must be inherited
        through
        <varname>$LISTEN_FDS</varname>/<varname>$LISTEN_PID</varname>.
        In the second case, an HTTP or HTTPS server will be spawned on
        this port, respectively for <option>--listen-http</option> and
        <option>--listen-https</option>. Currenntly, only POST requests
        to <filename>/upload</filename> with <literal>Content-Type:
        application/vnd.fdo.journal</literal> are supported.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>$LISTEN_FDS</varname></term>

        <listitem><para><command>systemd-journal-remote</command>
        supports the
        <varname>$LISTEN_FDS</varname>/<varname>$LISTEN_PID</varname>
        protocol. Open sockets inherited through socket activation
        behave like those opened with <option>--listen-raw=</option>
        described above, unless they are specified as an argument in
        <option>--listen-http=-<replaceable>n</replaceable></option>
        or
        <option>--listen-https=-<replaceable>n</replaceable></option>
        above. In the latter case, an HTTP or HTTPS server will be
        spawned using this descriptor and connections must be made
        over the HTTP protocol.</para>
        </listitem>
      </varlistentry>

    </variablelist>
  </refsect1>

  <refsect1>
    <title>Sinks</title>

    <para>The location of the output journal can be specified
    with <option>-o</option> or <option>--output=</option>.
    </para>

    <variablelist>
      <varlistentry>
        <term><option>--output=<replaceable>FILE</replaceable></option></term>

        <listitem><para>Will write to this journal. The filename must
        end with <filename>.journal</filename>. The file will be
        created if it does not exist. If necessary (journal file
        full, or corrupted), the file will be renamed following normal
        journald rules and a new journal file will be created in its
        stead.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--output=<replaceable>DIR</replaceable></option></term>

        <listitem><para>Will create journal files underneath directory
        <replaceable>DIR</replaceable>. The directory must exist. If
        necessary (journal files over size, or corrupted), journal
        files will be rotated following normal journald rules. Names
        of files underneath <replaceable>DIR</replaceable> will be
        generated using the rules described below.</para></listitem>
      </varlistentry>
    </variablelist>

    <para>If <option>--output=</option> is not used, the output directory
    <filename>/var/log/journal/<replaceable>machine-id</replaceable>/</filename>
    will be used, where <replaceable>machine-id</replaceable> is the
    identifier of the current system (see
    <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry>).
    In case the output file is not specified, journal files will be
    created underneath the selected directory. Files will be called
    <filename>remote-<replaceable>variable</replaceable>.journal</filename>,
    where the <replaceable>variable</replaceable> part is generated
    based on what passive and active sources are specified. It is
    recommended to give a full output filename.</para>

    <para>In case of "active" sources, if the hostname is known, it
    will be used in the <replaceable>variable</replaceable> part.
    Otherwise, local address and port number will be used, or
    <literal>stdin</literal> for events passed over standard
    input, and <literal>multiple</literal> if more than one source
    is specified.</para>
  </refsect1>

  <refsect1>
    <title>Options</title>

    <para>The following options are understood:</para>

    <variablelist>
      <varlistentry>
        <term><option>--help</option></term>
        <term><option>-h</option></term>

        <listitem><para>Print a short help
        text and exit.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--version</option></term>

        <listitem><para>Print a short version
        string and exit.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--compress</option></term>
        <term><option>--no-compress</option></term>

        <listitem><para>Compress or not, respectively, the data in the
        journal using XZ.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--seal</option></term>
        <term><option>--no-seal</option></term>

        <listitem><para>Periodically sign or not, respectively, the
        data in the journal using Forward Secure Sealing.
        </para></listitem>
      </varlistentry>

      <varlistentry>
        <term><option>--getter=<replaceable>PROG --option1 --option2</replaceable></option></term>

        <listitem><para>Program to invoke to retrieve data. The journal
        event stream must be generated on standard output.</para>

        <para>Examples:</para>

        <programlisting>--getter='curl "-HAccept: application/vnd.fdo.journal" https://some.host:19531/'</programlisting>

        <programlisting>--getter='wget --header="Accept: application/vnd.fdo.journal" -O- https://some.host:19531/'</programlisting>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>Examples</title>
    <para>Copy local journal events to a different journal directory:
    <programlisting>
journalctl -o export | systemd-journal-remote -o /tmp/dir -
    </programlisting>
    </para>

    <para>Retrieve events from a remote
    <citerefentry><refentrytitle>systemd-journal-gatewayd</refentrytitle><manvolnum>8</manvolnum></citerefentry>
    instance and store them in
    <filename>/var/log/journal/some.host/remote-some~host.journal</filename>:
    <programlisting>
systemd-journal-remote --url http://some.host:19531/
    </programlisting>
    </para>
  </refsect1>

  <refsect1>
    <title>See Also</title>
    <para>
      <citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd-journal-gatewayd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
    </para>
  </refsect1>
</refentry>