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authorLuke Shumaker <lukeshu@lukeshu.com>2017-05-10 14:47:43 -0400
committerLuke Shumaker <lukeshu@lukeshu.com>2017-05-10 14:47:43 -0400
commit9fdd60e58532607eeda4e396bebea2c22143cac8 (patch)
tree68e002cbe5404a41f6cd0efb4d5bc34b29b6aedc /man/nss-resolve.xml
parentd3e52cd56c638be8fd8fa332a25107a3ecc2346d (diff)
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-<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
- This file is part of systemd.
-
- Copyright 2011 Lennart Poettering
- Copyright 2013 Tom Gundersen
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-
-<refentry id="nss-resolve" conditional='ENABLE_RESOLVED'>
-
- <refentryinfo>
- <title>nss-resolve</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>nss-resolve</refentrytitle>
- <manvolnum>8</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>nss-resolve</refname>
- <refname>libnss_resolve.so.2</refname>
- <refpurpose>Provide hostname resolution via <filename>systemd-resolved.service</filename></refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <para><filename>libnss_resolve.so.2</filename></para>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><command>nss-resolve</command> is a plug-in module for the GNU Name Service Switch (NSS) functionality of the
- GNU C Library (<command>glibc</command>) enabling it to resolve host names via the
- <citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry> local network
- name resolution service. It replaces the <command>nss-dns</command> plug-in module that traditionally resolves
- hostnames via DNS.</para>
-
- <para>To activate the NSS module, add <literal>resolve</literal> to the line starting with
- <literal>hosts:</literal> in <filename>/etc/nsswitch.conf</filename>.</para>
-
- <para>It is recommended to place <literal>resolve</literal> early in <filename>/etc/nsswitch.conf</filename>'
- <literal>hosts:</literal> line (but after the <literal>files</literal> or <literal>mymachines</literal> entries),
- replacing the <literal>dns</literal> entry if it exists, to ensure DNS queries are always routed via
- <citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
-
- <para>Note that <command>nss-resolve</command> will chain-load <command>nss-dns</command> if
- <filename>systemd-resolved.service</filename> is not running, ensuring that basic DNS resolution continues to work
- if the service is down.</para>
- </refsect1>
-
- <refsect1>
- <title>Example</title>
-
- <para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables <command>nss-resolve</command>
- correctly:</para>
-
-<programlisting>passwd: compat mymachines systemd
-group: compat mymachines systemd
-shadow: compat
-
-hosts: files mymachines <command>resolve [!UNAVAIL=return]</command> dns myhostname
-networks: files
-
-protocols: db files
-services: db files
-ethers: db files
-rpc: db files
-
-netgroup: nis</programlisting>
-
- <para>This keeps the <command>dns</command> module as a fallback for cases where the <command>nss-resolve</command>
- module is not installed.</para>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>nss-systemd</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>nss-mymachines</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>