systemd/man/systemd-journal-gatewayd.service.xml
Samuel BF c362a432af Wider range of options for selecting entries for systemd-journal-gatewayd
Introducing --user, --system, --merge and --file flags, like for journalctl
and systemd-journal-upload.
2021-05-10 12:20:27 +02:00

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<?xml version='1.0'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
<refentry id="systemd-journal-gatewayd.service" conditional='HAVE_MICROHTTPD'
xmlns:xi="http://www.w3.org/2001/XInclude">
<refentryinfo>
<title>systemd-journal-gatewayd.service</title>
<productname>systemd</productname>
</refentryinfo>
<refmeta>
<refentrytitle>systemd-journal-gatewayd.service</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>systemd-journal-gatewayd.service</refname>
<refname>systemd-journal-gatewayd.socket</refname>
<refname>systemd-journal-gatewayd</refname>
<refpurpose>HTTP server for journal events</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>systemd-journal-gatewayd.service</filename></para>
<para><filename>systemd-journal-gatewayd.socket</filename></para>
<cmdsynopsis>
<command>/usr/lib/systemd/systemd-journal-gatewayd</command>
<arg choice="opt" rep="repeat">OPTIONS</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><command>systemd-journal-gatewayd</command> serves journal
events over the network. Clients must connect using
HTTP. The server listens on port 19531 by default.
If <option>--cert=</option> is specified, the server expects
HTTPS connections.</para>
<para>The program is started by
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>
and expects to receive a single socket. Use
<command>systemctl start systemd-journal-gatewayd.socket</command> to start
the service, and <command>systemctl enable systemd-journal-gatewayd.socket</command>
to have it started on boot.</para>
</refsect1>
<refsect1>
<title>Options</title>
<para>The following options are understood:</para>
<variablelist>
<varlistentry>
<term><option>--cert=</option></term>
<listitem><para>Specify the path to a file or <constant>AF_UNIX</constant> stream socket to read the
server certificate from. The certificate must be in PEM format. This option switches
<command>systemd-journal-gatewayd</command> into HTTPS mode and must be used together with
<option>--key=</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--key=</option></term>
<listitem><para>Specify the path to a file or <constant>AF_UNIX</constant> stream socket to read the
secret server key corresponding to the certificate specified with <option>--cert=</option> from. The
key must be in PEM format.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--trust=</option></term>
<listitem><para>Specify the path to a file or <constant>AF_UNIX</constant> stream socket to read a CA
certificate from. The certificate must be in PEM format.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--system</option></term>
<term><option>--user</option></term>
<listitem><para>Limit served entries to entries from system
services and the kernel, or to entries from services of
current user. This has the same meaning as
<option>--system</option> and <option>--user</option> options
for
<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>. If
neither is specified, all accessible entries are served.
</para></listitem>
</varlistentry>
<varlistentry>
<term><option>-m</option></term>
<term><option>--merge</option></term>
<listitem><para>Serve entries interleaved from all available
journals, including other machines. This has the same meaning
as <option>--merge</option> option for
<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</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, <command>systemd-journal-gatewayd</command> will serve 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. Serve
entries from 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. This has the same meaning as
<option>--file=</option> option for
<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
</para></listitem>
</varlistentry>
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
</variablelist>
</refsect1>
<refsect1>
<title>Supported URLs</title>
<para>The following URLs are recognized:</para>
<variablelist>
<varlistentry>
<term><uri>/browse</uri></term>
<listitem><para>Interactive browsing.</para></listitem>
</varlistentry>
<varlistentry>
<term><uri>/entries[?option1&amp;option2=value…]</uri></term>
<listitem><para>Retrieval of events in various formats.</para>
<para>The <option>Accept:</option> part of the HTTP header
determines the format. Supported values are described below.
</para>
<para>The <option>Range:</option> part of the HTTP header
determines the range of events returned. Supported values are
described below.
</para>
<para>GET parameters can be used to modify what events are
returned. Supported parameters are described below.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><uri>/machine</uri></term>
<listitem><para>Return a JSON structure describing the machine.</para>
<para>Example:
<programlisting>{ "machine_id" : "8cf7ed9d451ea194b77a9f118f3dc446",
"boot_id" : "3d3c9efaf556496a9b04259ee35df7f7",
"hostname" : "fedora",
"os_pretty_name" : "Fedora 19 (Rawhide)",
"virtualization" : "kvm",
…}</programlisting>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><uri>/fields/<replaceable>FIELD_NAME</replaceable></uri></term>
<listitem><para>Return a list of values of this field present in the logs.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Accept header</title>
<para>
<option>Accept: <replaceable>format</replaceable></option>
</para>
<para>Recognized formats:</para>
<variablelist>
<varlistentry>
<term><constant>text/plain</constant></term>
<listitem><para>The default. Plaintext syslog-like output,
one line per journal entry
(like <command>journalctl --output short</command>).</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>application/json</constant></term>
<listitem><para>Entries are formatted as JSON data structures,
one per line
(like <command>journalctl --output json</command>).
See <ulink
url="https://www.freedesktop.org/wiki/Software/systemd/json">Journal
JSON Format</ulink> for more information.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>text/event-stream</constant></term>
<listitem><para>Entries are formatted as JSON data structures,
wrapped in a format suitable for <ulink
url="https://developer.mozilla.org/en-US/docs/Server-sent_events/Using_server-sent_events">
Server-Sent Events</ulink>
(like <command>journalctl --output json-sse</command>).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><constant>application/vnd.fdo.journal</constant></term>
<listitem><para>Entries are serialized into a binary (but
mostly text-based) stream suitable for backups and network
transfer
(like <command>journalctl --output export</command>).
See <ulink
url="https://www.freedesktop.org/wiki/Software/systemd/export">Journal
Export Format</ulink> for more information.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Range header</title>
<para>
<option>Range: entries=<replaceable>cursor</replaceable>[[:<replaceable>num_skip</replaceable>]:<replaceable>num_entries</replaceable>]</option>
</para>
<para>where
<replaceable>cursor</replaceable> is a cursor string,
<replaceable>num_skip</replaceable> is an integer,
<replaceable>num_entries</replaceable> is an unsigned integer.
</para>
<para>Range defaults to all available events.</para>
</refsect1>
<refsect1>
<title>URL GET parameters</title>
<para>Following parameters can be used as part of the URL:</para>
<variablelist>
<varlistentry>
<term><uri>follow</uri></term>
<listitem><para>wait for new events
(like <command>journalctl --follow</command>, except that
the number of events returned is not limited).</para>
</listitem>
</varlistentry>
<varlistentry>
<term><uri>discrete</uri></term>
<listitem><para>Test that the specified cursor refers to an
entry in the journal. Returns just this entry.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><uri>boot</uri></term>
<listitem><para>Limit events to the current boot of the system
(like <command>journalctl -b</command>).</para></listitem>
</varlistentry>
<varlistentry>
<term><uri><replaceable>KEY</replaceable>=<replaceable>match</replaceable></uri></term>
<listitem><para>Match journal fields. See
<citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>.</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Examples</title>
<para>Retrieve events from this boot from local journal
in <ulink
url="https://www.freedesktop.org/wiki/Software/systemd/export">Journal
Export Format</ulink>:
<programlisting>curl --silent -H'Accept: application/vnd.fdo.journal' \
'http://localhost:19531/entries?boot'</programlisting>
</para>
<para>Listen for core dumps:
<programlisting>curl 'http://localhost:19531/entries?follow&amp;MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1'</programlisting></para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>journalctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd.journal-fields</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</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>