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