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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 | <!-- | |
52ad194e MB |
6 | SPDX-License-Identifier: LGPL-2.1+ |
7 | ||
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8 | This file is part of systemd. |
9 | ||
10 | Copyright 2014 Lennart Poettering | |
11 | ||
12 | systemd is free software; you can redistribute it and/or modify it | |
13 | under the terms of the GNU Lesser General Public License as published by | |
14 | the Free Software Foundation; either version 2.1 of the License, or | |
15 | (at your option) any later version. | |
16 | ||
17 | systemd is distributed in the hope that it will be useful, but | |
18 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
20 | Lesser General Public License for more details. | |
21 | ||
22 | You should have received a copy of the GNU Lesser General Public License | |
23 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
24 | --> | |
25 | ||
26 | <refentry id="nss-mymachines" conditional='ENABLE_MACHINED'> | |
27 | ||
28 | <refentryinfo> | |
29 | <title>nss-mymachines</title> | |
30 | <productname>systemd</productname> | |
31 | ||
32 | <authorgroup> | |
33 | <author> | |
34 | <contrib>Developer</contrib> | |
35 | <firstname>Lennart</firstname> | |
36 | <surname>Poettering</surname> | |
37 | <email>lennart@poettering.net</email> | |
38 | </author> | |
39 | </authorgroup> | |
40 | </refentryinfo> | |
41 | ||
42 | <refmeta> | |
43 | <refentrytitle>nss-mymachines</refentrytitle> | |
44 | <manvolnum>8</manvolnum> | |
45 | </refmeta> | |
46 | ||
47 | <refnamediv> | |
48 | <refname>nss-mymachines</refname> | |
49 | <refname>libnss_mymachines.so.2</refname> | |
50 | <refpurpose>Provide hostname resolution for local | |
51 | container instances.</refpurpose> | |
52 | </refnamediv> | |
53 | ||
54 | <refsynopsisdiv> | |
55 | <para><filename>libnss_mymachines.so.2</filename></para> | |
56 | </refsynopsisdiv> | |
57 | ||
58 | <refsect1> | |
59 | <title>Description</title> | |
60 | ||
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61 | <para><command>nss-mymachines</command> is a plug-in module for the GNU Name Service Switch (NSS) functionality of |
62 | the GNU C Library (<command>glibc</command>), providing hostname resolution for the names of containers running | |
63 | locally that are registered with | |
64 | <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>. The | |
65 | container names are resolved to the IP addresses of the specific container, ordered by their scope. This | |
66 | functionality only applies to containers using network namespacing.</para> | |
67 | ||
68 | <para>The module also resolves user and group IDs used by containers to user and group names indicating the | |
69 | container name, and back. This functionality only applies to containers using user namespacing.</para> | |
70 | ||
71 | <para>To activate the NSS module, add <literal>mymachines</literal> to the lines starting with | |
72 | <literal>hosts:</literal>, <literal>passwd:</literal> and <literal>group:</literal> in | |
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73 | <filename>/etc/nsswitch.conf</filename>.</para> |
74 | ||
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75 | <para>It is recommended to place <literal>mymachines</literal> after the <literal>files</literal> or |
76 | <literal>compat</literal> entry of the <filename>/etc/nsswitch.conf</filename> lines to make sure that its mappings | |
77 | are preferred over other resolvers such as DNS, but so that <filename>/etc/hosts</filename>, | |
78 | <filename>/etc/passwd</filename> and <filename>/etc/group</filename> based mappings take precedence.</para> | |
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79 | </refsect1> |
80 | ||
81 | <refsect1> | |
82 | <title>Example</title> | |
83 | ||
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84 | <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables |
85 | <command>nss-mymachines</command> correctly:</para> | |
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87 | <programlisting>passwd: compat <command>mymachines</command> systemd |
88 | group: compat <command>mymachines</command> systemd | |
7035cd9e | 89 | shadow: compat |
e735f4d4 | 90 | |
8a584da2 | 91 | hosts: files <command>mymachines</command> resolve [!UNAVAIL=return] dns myhostname |
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92 | networks: files |
93 | ||
94 | protocols: db files | |
95 | services: db files | |
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96 | ethers: db files |
97 | rpc: db files | |
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98 | |
99 | netgroup: nis</programlisting> | |
100 | ||
101 | </refsect1> | |
102 | ||
103 | <refsect1> | |
104 | <title>See Also</title> | |
105 | <para> | |
106 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
107 | <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
8a584da2 | 108 | <citerefentry><refentrytitle>nss-systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
13d276d0 | 109 | <citerefentry><refentrytitle>nss-resolve</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
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110 | <citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
111 | <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
112 | <citerefentry project='man-pages'><refentrytitle>getent</refentrytitle><manvolnum>1</manvolnum></citerefentry> | |
113 | </para> | |
114 | </refsect1> | |
115 | ||
116 | </refentry> |