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