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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 | <!-- | |
572eb058 ZJS |
6 | SPDX-License-Identifier: LGPL-2.1+ |
7 | ||
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8 | This file is part of systemd. |
9 | ||
10 | Copyright 2016 Lennart Poettering | |
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11 | --> |
12 | ||
e7e11bbf | 13 | <refentry id="nss-systemd" conditional='ENABLE_NSS_SYSTEMD'> |
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14 | |
15 | <refentryinfo> | |
16 | <title>nss-systemd</title> | |
17 | <productname>systemd</productname> | |
18 | ||
19 | <authorgroup> | |
20 | <author> | |
21 | <contrib>Developer</contrib> | |
22 | <firstname>Lennart</firstname> | |
23 | <surname>Poettering</surname> | |
24 | <email>lennart@poettering.net</email> | |
25 | </author> | |
26 | </authorgroup> | |
27 | </refentryinfo> | |
28 | ||
29 | <refmeta> | |
30 | <refentrytitle>nss-systemd</refentrytitle> | |
31 | <manvolnum>8</manvolnum> | |
32 | </refmeta> | |
33 | ||
34 | <refnamediv> | |
35 | <refname>nss-systemd</refname> | |
36 | <refname>libnss_systemd.so.2</refname> | |
37 | <refpurpose>Provide UNIX user and group name resolution for dynamic users and groups.</refpurpose> | |
38 | </refnamediv> | |
39 | ||
40 | <refsynopsisdiv> | |
41 | <para><filename>libnss_systemd.so.2</filename></para> | |
42 | </refsynopsisdiv> | |
43 | ||
44 | <refsect1> | |
45 | <title>Description</title> | |
46 | ||
47 | <para><command>nss-systemd</command> is a plug-in module for the GNU Name Service Switch (NSS) functionality of the | |
48 | GNU C Library (<command>glibc</command>), providing UNIX user and group name resolution for dynamic users and | |
49 | groups allocated through the <varname>DynamicUser=</varname> option in systemd unit files. See | |
50 | <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details on | |
51 | this option.</para> | |
52 | ||
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53 | <para>This module also ensures that the root and nobody users and groups (i.e. the users/groups with the UIDs/GIDs |
54 | 0 and 65534) remain resolvable at all times, even if they aren't listed in <filename>/etc/passwd</filename> or | |
55 | <filename>/etc/group</filename>, or if these files are missing.</para> | |
56 | ||
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57 | <para>To activate the NSS module, add <literal>systemd</literal> to the lines starting with |
58 | <literal>passwd:</literal> and <literal>group:</literal> in <filename>/etc/nsswitch.conf</filename>.</para> | |
59 | ||
60 | <para>It is recommended to place <literal>systemd</literal> after the <literal>files</literal> or | |
61 | <literal>compat</literal> entry of the <filename>/etc/nsswitch.conf</filename> lines so that | |
62 | <filename>/etc/passwd</filename> and <filename>/etc/group</filename> based mappings take precedence.</para> | |
63 | </refsect1> | |
64 | ||
65 | <refsect1> | |
66 | <title>Example</title> | |
67 | ||
68 | <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables | |
69 | <command>nss-systemd</command> correctly:</para> | |
70 | ||
71 | <programlisting>passwd: compat mymachines <command>systemd</command> | |
72 | group: compat mymachines <command>systemd</command> | |
73 | shadow: compat | |
74 | ||
75555c28 | 75 | hosts: files mymachines resolve [!UNAVAIL=return] dns myhostname |
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76 | networks: files |
77 | ||
78 | protocols: db files | |
79 | services: db files | |
80 | ethers: db files | |
81 | rpc: db files | |
82 | ||
83 | netgroup: nis</programlisting> | |
84 | ||
85 | </refsect1> | |
86 | ||
87 | <refsect1> | |
88 | <title>See Also</title> | |
89 | <para> | |
90 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
91 | <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
92 | <citerefentry><refentrytitle>nss-resolve</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
93 | <citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
94 | <citerefentry><refentrytitle>nss-mymachines</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
95 | <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
96 | <citerefentry project='man-pages'><refentrytitle>getent</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
97 | </para> | |
98 | </refsect1> | |
99 | ||
100 | </refentry> |