<?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 is an example <filename>/etc/nsswitch.conf</filename> file that enables <command>resolve</command> correctly:</para> <programlisting>passwd: compat mymachines group: compat mymachines 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>