mirror of
https://github.com/systemd/systemd
synced 2024-11-05 18:25:39 +00:00
74 lines
3.9 KiB
XML
74 lines
3.9 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
|
|
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
|
|
|
|
<refentry id="systemd-userdbd.service" conditional='ENABLE_USERDB'>
|
|
|
|
<refentryinfo>
|
|
<title>systemd-userdbd.service</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>systemd-userdbd.service</refentrytitle>
|
|
<manvolnum>8</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>systemd-userdbd.service</refname>
|
|
<refname>systemd-userdbd</refname>
|
|
<refpurpose>JSON User/Group Record Query Multiplexer/NSS Compatibility</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsynopsisdiv>
|
|
<para><filename>systemd-userdbd.service</filename></para>
|
|
<para><filename>/usr/lib/systemd/systemd-userdbd</filename></para>
|
|
</refsynopsisdiv>
|
|
|
|
<refsect1>
|
|
<title>Description</title>
|
|
|
|
<para><command>systemd-userdbd</command> is a system service that multiplexes user/group lookups to all
|
|
local services that provide JSON user/group record definitions to the system. In addition it synthesizes
|
|
JSON user/group records from classic UNIX/glibc NSS user/group records in order to provide full backwards
|
|
compatibility. It may also pick up statically defined JSON user/group records from files in
|
|
<filename>/etc/userdb/</filename>, <filename>/run/userdb/</filename>,
|
|
<filename>/run/host/userdb/</filename> and <filename>/usr/lib/userdb/</filename> with the
|
|
<literal>.user</literal> extension.</para>
|
|
|
|
<para>Most of <command>systemd-userdbd</command>'s functionality is accessible through the
|
|
<citerefentry><refentrytitle>userdbctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
|
|
command.</para>
|
|
|
|
<para>The user and group records this service provides access to follow the <ulink
|
|
url="https://systemd.io/USER_RECORD">JSON User Records</ulink> and <ulink
|
|
url="https://systemd.io/GROUP_RECORD">JSON Group Record</ulink> definitions. This service implements the
|
|
<ulink url="https://systemd.io/USER_GROUP_API">User/Group Record Lookup API via Varlink</ulink>, and
|
|
multiplexes access other services implementing this API, too. It is thus both server and client of this
|
|
API.</para>
|
|
|
|
<para>This service provides three distinct <ulink url="https://varlink.org/">Varlink</ulink> services:
|
|
<constant>io.systemd.Multiplexer</constant> provides a single, unified API for querying JSON user and
|
|
group records. Internally it talks to all other user/group record services running on the system in
|
|
parallel and forwards any information discovered. This simplifies clients substantially since they need
|
|
to talk to a single service only instead of all of them in
|
|
parallel. <constant>io.systemd.NameServiceSwitch</constant> provides compatibility with classic
|
|
UNIX/glibc NSS user records, i.e. converts <type>struct passwd</type> and <type>struct group</type>
|
|
records as acquired with APIs such as <citerefentry
|
|
project='man-pages'><refentrytitle>getpwnam</refentrytitle><manvolnum>1</manvolnum></citerefentry> to
|
|
JSON user/group records, thus hiding the differences between the services as much as
|
|
possible. <constant>io.systemd.DropIn</constant> makes JSON user/group records from the aforementioned
|
|
drop-in directories available.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>See Also</title>
|
|
<para><simplelist type="inline">
|
|
<member><citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>nss-systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>userdbctl</refentrytitle><manvolnum>1</manvolnum></citerefentry></member>
|
|
<member><citerefentry><refentrytitle>systemd-homed.service</refentrytitle><manvolnum>8</manvolnum></citerefentry></member>
|
|
</simplelist></para>
|
|
</refsect1>
|
|
</refentry>
|