275 lines
8.7 KiB
XML
275 lines
8.7 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-gatewayd.service">
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<refentryinfo>
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<title>systemd-journal-gatewayd.service</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>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-gatewayd.service</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-journal-gatewayd.service</refname>
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<refname>systemd-journal-gatewayd.socket</refname>
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<refname>systemd-journal-gatewayd</refname>
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<refpurpose>HTTP server for journal events</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd-journal-gatewayd.service</filename></para>
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<para><filename>systemd-journal-gatewayd.socket</filename></para>
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<cmdsynopsis><command>/usr/lib/systemd/systemd-journal-gatewayd</command>
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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>systemd-journal-gatewayd</command> serves journal
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events over the network. Clients must connect using
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HTTP. The server listens on port 19531 by default.</para>
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<para>The program is started by
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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and expects to receive a single socket. Use
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<command>systemctl start systemd-journal-gatewayd.socket</command> to start
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the service, and <command>systemctl enable systemd-journal-gatewayd.socket</command>
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to have it started on boot.</para>
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</refsect1>
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<refsect1>
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<title>Supported URLs</title>
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<para>The following URLs are recognized:</para>
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<variablelist>
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<varlistentry>
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<term><option>/browse</option></term>
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<listitem><para>Interactive browsing.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option>/entries[?option1&option2=value...]</option></term>
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<listitem><para>Retrieval of events in various formats.</para>
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<para>The <option>Accept:</option> part of the HTTP header
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determines the format. Supported values are described below.
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</para>
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<para>The <option>Range:</option> part of the HTTP header
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determines the range of events returned. Supported values are
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described below.
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</para>
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<para>GET parameters can be used to modify what events are
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returned. Supported parameters are described below.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>/machine</option></term>
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<listitem><para>Return a JSON structure describing the machine.</para>
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<para>Example:
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<programlisting>
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{ "machine_id" : "8cf7ed9d451ea194b77a9f118f3dc446",
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"boot_id" : "3d3c9efaf556496a9b04259ee35df7f7",
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"hostname" : "fedora",
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"os_pretty_name" : "Fedora 19 (Rawhide)",
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"virtualization" : "kvm",
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...}
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</programlisting>
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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><option>/fields/</option><replaceable>FIELD_NAME</replaceable></term>
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<listitem><para>Return a list of values of this field present in the logs.</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>Accept header</title>
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<para>
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<option>Accept: </option><replaceable>format</replaceable>
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</para>
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<para>Recognized formats:</para>
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<variablelist>
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<varlistentry>
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<term><option>text/plain</option></term>
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<listitem><para>The default. Plaintext syslog-like output,
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one line per journal entry
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(like <command>journalctl --output short</command>).</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>application/json</option></term>
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<listitem><para>Entries are formatted as JSON data structures,
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one per line
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(like <command>journalctl --output json</command>).
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See <ulink
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url="http://www.freedesktop.org/wiki/Software/systemd/json">Journal
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JSON Format</ulink> for more information.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>application/event-stream</option></term>
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<listitem><para>Entries are formatted as JSON data structures,
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wrapped in a format suitable for <ulink
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url="https://developer.mozilla.org/en-US/docs/Server-sent_events/Using_server-sent_events">
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Server-Sent Events</ulink>
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(like <command>journalctl --output json-sse</command>).
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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><option>application/vnd.fdo.journal</option></term>
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<listitem><para>Entries are serialized into a binary (but
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mostly text-based) stream suitable for backups and network
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transfer
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(like <command>journalctl --output export</command>).
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See <ulink
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url="http://www.freedesktop.org/wiki/Software/systemd/export">Journal
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Export Format</ulink> for more information.</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>Range header</title>
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<para>
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<option>Range: entries=<cursor>[[:<num_skip>]:<num_entries>]</option>
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</para>
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<para>where
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<option>cursor</option> is a cursor string,
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<option>num_skip</option> is an integer,
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<option>num_entries</option> is an unsigned integer.
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</para>
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<para>Range defaults to all available events.</para>
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</refsect1>
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<refsect1>
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<title>URL GET parameters</title>
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<para>Following parameters can be used as part of the URL:</para>
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<variablelist>
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<varlistentry>
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<term><option>follow</option></term>
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<listitem><para>wait for new events
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(like <command>journalctl --follow</command>, except that
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the number of events returned is not limited).</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>discrete</option></term>
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<listitem><para>Test that the specified cursor refers to an
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entry in the journal. Returns just this entry.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>boot</option></term>
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<listitem><para>Limit events to the current boot of the system
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(like <command>journalctl --this--boot</command>).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><option><KEY>=<match></option></term>
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<listitem><para>Match journal fields. See
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<citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</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>Examples</title>
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<para>Retrieve events from this boot from local journal
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in <ulink
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url="http://www.freedesktop.org/wiki/Software/systemd/export">Journal
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Export Format</ulink>:
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<programlisting>
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curl --silent -H'Accept: application/vnd.fdo.journal' \
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'http://localhost:19531/entries?boot'
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</programlisting>
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</para>
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<para>Listen for core dumps:
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<programlisting>
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curl 'http://localhost:19531/entries?follow&MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1'
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</programlisting></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>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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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-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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</para>
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</refsect1>
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</refentry>
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