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1 | <?xml version='1.0'?> <!--*-nxml-*--> |
2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" | |
3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> | |
4 | ||
5 | <!-- | |
6 | This file is part of systemd. | |
7 | ||
8 | Copyright 2016 Lennart Poettering | |
9 | ||
10 | systemd is free software; you can redistribute it and/or modify it | |
11 | under the terms of the GNU Lesser General Public License as published by | |
12 | the Free Software Foundation; either version 2.1 of the License, or | |
13 | (at your option) any later version. | |
14 | ||
15 | systemd is distributed in the hope that it will be useful, but | |
16 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | Lesser General Public License for more details. | |
19 | ||
20 | You should have received a copy of the GNU Lesser General Public License | |
21 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
22 | --> | |
23 | ||
24 | <refentry id="nss-systemd"> | |
25 | ||
26 | <refentryinfo> | |
27 | <title>nss-systemd</title> | |
28 | <productname>systemd</productname> | |
29 | ||
30 | <authorgroup> | |
31 | <author> | |
32 | <contrib>Developer</contrib> | |
33 | <firstname>Lennart</firstname> | |
34 | <surname>Poettering</surname> | |
35 | <email>lennart@poettering.net</email> | |
36 | </author> | |
37 | </authorgroup> | |
38 | </refentryinfo> | |
39 | ||
40 | <refmeta> | |
41 | <refentrytitle>nss-systemd</refentrytitle> | |
42 | <manvolnum>8</manvolnum> | |
43 | </refmeta> | |
44 | ||
45 | <refnamediv> | |
46 | <refname>nss-systemd</refname> | |
47 | <refname>libnss_systemd.so.2</refname> | |
48 | <refpurpose>Provide UNIX user and group name resolution for dynamic users and groups.</refpurpose> | |
49 | </refnamediv> | |
50 | ||
51 | <refsynopsisdiv> | |
52 | <para><filename>libnss_systemd.so.2</filename></para> | |
53 | </refsynopsisdiv> | |
54 | ||
55 | <refsect1> | |
56 | <title>Description</title> | |
57 | ||
58 | <para><command>nss-systemd</command> is a plug-in module for the GNU Name Service Switch (NSS) functionality of the | |
59 | GNU C Library (<command>glibc</command>), providing UNIX user and group name resolution for dynamic users and | |
60 | groups allocated through the <varname>DynamicUser=</varname> option in systemd unit files. See | |
61 | <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details on | |
62 | this option.</para> | |
63 | ||
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64 | <para>This module also ensures that the root and nobody users and groups (i.e. the users/groups with the UIDs/GIDs |
65 | 0 and 65534) remain resolvable at all times, even if they aren't listed in <filename>/etc/passwd</filename> or | |
66 | <filename>/etc/group</filename>, or if these files are missing.</para> | |
67 | ||
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68 | <para>To activate the NSS module, add <literal>systemd</literal> to the lines starting with |
69 | <literal>passwd:</literal> and <literal>group:</literal> in <filename>/etc/nsswitch.conf</filename>.</para> | |
70 | ||
71 | <para>It is recommended to place <literal>systemd</literal> after the <literal>files</literal> or | |
72 | <literal>compat</literal> entry of the <filename>/etc/nsswitch.conf</filename> lines so that | |
73 | <filename>/etc/passwd</filename> and <filename>/etc/group</filename> based mappings take precedence.</para> | |
74 | </refsect1> | |
75 | ||
76 | <refsect1> | |
77 | <title>Example</title> | |
78 | ||
79 | <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables | |
80 | <command>nss-systemd</command> correctly:</para> | |
81 | ||
82 | <programlisting>passwd: compat mymachines <command>systemd</command> | |
83 | group: compat mymachines <command>systemd</command> | |
84 | shadow: compat | |
85 | ||
75555c28 | 86 | hosts: files mymachines resolve [!UNAVAIL=return] dns myhostname |
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87 | networks: files |
88 | ||
89 | protocols: db files | |
90 | services: db files | |
91 | ethers: db files | |
92 | rpc: db files | |
93 | ||
94 | netgroup: nis</programlisting> | |
95 | ||
96 | </refsect1> | |
97 | ||
98 | <refsect1> | |
99 | <title>See Also</title> | |
100 | <para> | |
101 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
102 | <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
103 | <citerefentry><refentrytitle>nss-resolve</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
104 | <citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
105 | <citerefentry><refentrytitle>nss-mymachines</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
106 | <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
107 | <citerefentry project='man-pages'><refentrytitle>getent</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
108 | </para> | |
109 | </refsect1> | |
110 | ||
111 | </refentry> |