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authorLennart Poettering <lennart@poettering.net>2015-08-26 11:00:09 +0200
committerLennart Poettering <lennart@poettering.net>2015-08-26 11:00:09 +0200
commit0d6868f9ae83c06b23676eec0726e1f37adce30e (patch)
tree35d5bb5e8f4b2c7f4770f25f543481abc5aeda1f /man/nss-resolve.xml
parent2dc6b11d29ae09f59de314bad24ad196b0d14277 (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 plugin 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.</para>
+
+ <para>To activate the NSS module, <literal>resolve</literal>
+ has to be added 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 the <filename>nsswitch.conf</filename> line (but after the
+ <literal>files</literal> entry), 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>
+ </refsect1>
+
+ <refsect1>
+ <title>Example</title>
+
+ <para>Here's an example <filename>/etc/nsswitch.conf</filename>
+ file, that enables <command>resolve</command> correctly:</para>
+
+<programlisting>passwd: compat
+group: compat
+shadow: compat
+
+hosts: files <command>resolve</command> mymachines myhostname
+networks: files
+
+protocols: db files
+services: db files
+ethers: db files
+rpc: db files
+
+netgroup: nis</programlisting>
+
+ <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>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>nss-mymachines</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
+ <citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+
+</refentry>