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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">
-
-<!--
- This file is part of systemd.
-
- Copyright 2016 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-
-<refentry id="nss-systemd">
-
- <refentryinfo>
- <title>nss-systemd</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>nss-systemd</refentrytitle>
- <manvolnum>8</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>nss-systemd</refname>
- <refname>libnss_systemd.so.2</refname>
- <refpurpose>Provide UNIX user and group name resolution for dynamic users and groups.</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <para><filename>libnss_systemd.so.2</filename></para>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><command>nss-systemd</command> is a plug-in module for the GNU Name Service Switch (NSS) functionality of the
- GNU C Library (<command>glibc</command>), providing UNIX user and group name resolution for dynamic users and
- groups allocated through the <varname>DynamicUser=</varname> option in systemd unit files. See
- <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details on
- this option.</para>
-
- <para>This module also ensures that the root and nobody users and groups (i.e. the users/groups with the UIDs/GIDs
- 0 and 65534) remain resolvable at all times, even if they aren't listed in <filename>/etc/passwd</filename> or
- <filename>/etc/group</filename>, or if these files are missing.</para>
-
- <para>To activate the NSS module, add <literal>systemd</literal> to the lines starting with
- <literal>passwd:</literal> and <literal>group:</literal> in <filename>/etc/nsswitch.conf</filename>.</para>
-
- <para>It is recommended to place <literal>systemd</literal> after the <literal>files</literal> or
- <literal>compat</literal> entry of the <filename>/etc/nsswitch.conf</filename> lines so that
- <filename>/etc/passwd</filename> and <filename>/etc/group</filename> based mappings take precedence.</para>
- </refsect1>
-
- <refsect1>
- <title>Example</title>
-
- <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables
- <command>nss-systemd</command> correctly:</para>
-
- <programlisting>passwd: compat mymachines <command>systemd</command>
-group: compat mymachines <command>systemd</command>
-shadow: compat
-
-hosts: files mymachines resolve [!UNAVAIL=return] dns myhostname
-networks: files
-
-protocols: db files
-services: db files
-ethers: db files
-rpc: db files
-
-netgroup: nis</programlisting>
-
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>nss-resolve</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>nss-mymachines</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry project='man-pages'><refentrytitle>getent</refentrytitle><manvolnum>1</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>