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1 | <?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> |
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 2011 Lennart Poettering | |
9 | Copyright 2013 Tom Gundersen | |
10 | ||
11 | systemd is free software; you can redistribute it and/or modify it | |
12 | under the terms of the GNU Lesser General Public License as published by | |
13 | the Free Software Foundation; either version 2.1 of the License, or | |
14 | (at your option) any later version. | |
15 | ||
16 | systemd is distributed in the hope that it will be useful, but | |
17 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
19 | Lesser General Public License for more details. | |
20 | ||
21 | You should have received a copy of the GNU Lesser General Public License | |
22 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
23 | --> | |
24 | ||
25 | <refentry id="nss-resolve" conditional='ENABLE_RESOLVED'> | |
26 | ||
27 | <refentryinfo> | |
28 | <title>nss-resolve</title> | |
29 | <productname>systemd</productname> | |
30 | ||
31 | <authorgroup> | |
32 | <author> | |
33 | <contrib>Developer</contrib> | |
34 | <firstname>Lennart</firstname> | |
35 | <surname>Poettering</surname> | |
36 | <email>lennart@poettering.net</email> | |
37 | </author> | |
38 | </authorgroup> | |
39 | </refentryinfo> | |
40 | ||
41 | <refmeta> | |
42 | <refentrytitle>nss-resolve</refentrytitle> | |
43 | <manvolnum>8</manvolnum> | |
44 | </refmeta> | |
45 | ||
46 | <refnamediv> | |
47 | <refname>nss-resolve</refname> | |
48 | <refname>libnss_resolve.so.2</refname> | |
49 | <refpurpose>Provide hostname resolution via <filename>systemd-resolved.service</filename></refpurpose> | |
50 | </refnamediv> | |
51 | ||
52 | <refsynopsisdiv> | |
53 | <para><filename>libnss_resolve.so.2</filename></para> | |
54 | </refsynopsisdiv> | |
55 | ||
56 | <refsect1> | |
57 | <title>Description</title> | |
58 | ||
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59 | <para><command>nss-resolve</command> is a plug-in module for the GNU Name Service Switch (NSS) functionality of the |
60 | GNU C Library (<command>glibc</command>) enabling it to resolve host names via the | |
61 | <citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry> local network | |
62 | name resolution service. It replaces the <command>nss-dns</command> plug-in module that traditionally resolves | |
63 | hostnames via DNS.</para> | |
64 | ||
65 | <para>To activate the NSS module, add <literal>resolve</literal> to the line starting with | |
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66 | <literal>hosts:</literal> in <filename>/etc/nsswitch.conf</filename>. Specifcally, it is recommended to place |
67 | <literal>resolve</literal> early in <filename>/etc/nsswitch.conf</filename>' <literal>hosts:</literal> line (but | |
68 | after the <literal>files</literal> or <literal>mymachines</literal> entries), right before the | |
69 | <literal>dns</literal> entry if it exists, followed by <literal>[!UNAVAIL=return]</literal>, to ensure DNS queries | |
70 | are always routed via | |
71 | <citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry> if it is | |
72 | running, but are routed to <command>nss-dns</command> if this service is not available.</para> | |
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73 | </refsect1> |
74 | ||
75 | <refsect1> | |
76 | <title>Example</title> | |
77 | ||
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78 | <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables <command>nss-resolve</command> |
79 | correctly:</para> | |
0d6868f9 | 80 | |
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81 | <programlisting>passwd: compat mymachines systemd |
82 | group: compat mymachines systemd | |
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83 | shadow: compat |
84 | ||
75555c28 | 85 | hosts: files mymachines <command>resolve [!UNAVAIL=return]</command> dns myhostname |
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86 | networks: files |
87 | ||
88 | protocols: db files | |
89 | services: db files | |
90 | ethers: db files | |
91 | rpc: db files | |
92 | ||
93 | netgroup: nis</programlisting> | |
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94 | </refsect1> |
95 | ||
96 | <refsect1> | |
97 | <title>See Also</title> | |
98 | <para> | |
99 | <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, | |
100 | <citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry>, | |
409093fe | 101 | <citerefentry><refentrytitle>nss-systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
0d6868f9 | 102 | <citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
409093fe | 103 | <citerefentry><refentrytitle>nss-mymachines</refentrytitle><manvolnum>8</manvolnum></citerefentry>, |
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104 | <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry> |
105 | </para> | |
106 | </refsect1> | |
107 | ||
108 | </refentry> |