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409093fe | 1 | <?xml version='1.0'?> <!--*-nxml-*--> |
3a54a157 | 2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" |
409093fe | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
0307f791 | 4 | <!-- SPDX-License-Identifier: LGPL-2.1+ --> |
409093fe | 5 | |
e7e11bbf | 6 | <refentry id="nss-systemd" conditional='ENABLE_NSS_SYSTEMD'> |
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7 | |
8 | <refentryinfo> | |
9 | <title>nss-systemd</title> | |
10 | <productname>systemd</productname> | |
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11 | </refentryinfo> |
12 | ||
13 | <refmeta> | |
14 | <refentrytitle>nss-systemd</refentrytitle> | |
15 | <manvolnum>8</manvolnum> | |
16 | </refmeta> | |
17 | ||
18 | <refnamediv> | |
19 | <refname>nss-systemd</refname> | |
20 | <refname>libnss_systemd.so.2</refname> | |
21 | <refpurpose>Provide UNIX user and group name resolution for dynamic users and groups.</refpurpose> | |
22 | </refnamediv> | |
23 | ||
24 | <refsynopsisdiv> | |
25 | <para><filename>libnss_systemd.so.2</filename></para> | |
26 | </refsynopsisdiv> | |
27 | ||
28 | <refsect1> | |
29 | <title>Description</title> | |
30 | ||
31 | <para><command>nss-systemd</command> is a plug-in module for the GNU Name Service Switch (NSS) functionality of the | |
32 | GNU C Library (<command>glibc</command>), providing UNIX user and group name resolution for dynamic users and | |
33 | groups allocated through the <varname>DynamicUser=</varname> option in systemd unit files. See | |
34 | <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for details on | |
35 | this option.</para> | |
36 | ||
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37 | <para>This module also ensures that the root and nobody users and groups (i.e. the users/groups with the UIDs/GIDs |
38 | 0 and 65534) remain resolvable at all times, even if they aren't listed in <filename>/etc/passwd</filename> or | |
39 | <filename>/etc/group</filename>, or if these files are missing.</para> | |
40 | ||
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41 | <para>To activate the NSS module, add <literal>systemd</literal> to the lines starting with |
42 | <literal>passwd:</literal> and <literal>group:</literal> in <filename>/etc/nsswitch.conf</filename>.</para> | |
43 | ||
44 | <para>It is recommended to place <literal>systemd</literal> after the <literal>files</literal> or | |
45 | <literal>compat</literal> entry of the <filename>/etc/nsswitch.conf</filename> lines so that | |
46 | <filename>/etc/passwd</filename> and <filename>/etc/group</filename> based mappings take precedence.</para> | |
47 | </refsect1> | |
48 | ||
49 | <refsect1> | |
50 | <title>Example</title> | |
51 | ||
52 | <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables | |
53 | <command>nss-systemd</command> correctly:</para> | |
54 | ||
94f760ec | 55 | <!-- synchronize with other nss-* man pages and factory/etc/nsswitch.conf --> |
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56 | <programlisting>passwd: compat mymachines <command>systemd</command> |
57 | group: compat mymachines <command>systemd</command> | |
58 | shadow: compat | |
59 | ||
75555c28 | 60 | hosts: files mymachines resolve [!UNAVAIL=return] dns myhostname |
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61 | networks: files |
62 | ||
63 | protocols: db files | |
64 | services: db files | |
65 | ethers: db files | |
66 | rpc: db files | |
67 | ||
68 | netgroup: nis</programlisting> | |
69 | ||
70 | </refsect1> | |
71 | ||
72 | <refsect1> | |
73 | <title>See Also</title> | |
74 | <para> | |
75 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
76 | <citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
77 | <citerefentry><refentrytitle>nss-resolve</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
78 | <citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
79 | <citerefentry><refentrytitle>nss-mymachines</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
80 | <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
81 | <citerefentry project='man-pages'><refentrytitle>getent</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
82 | </para> | |
83 | </refsect1> | |
84 | ||
85 | </refentry> |