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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 2014 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="systemd-resolved.service" conditional='ENABLE_RESOLVED'>
-
- <refentryinfo>
- <title>systemd-resolved.service</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Tom</firstname>
- <surname>Gundersen</surname>
- <email>teg@jklm.no</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>systemd-resolved.service</refentrytitle>
- <manvolnum>8</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>systemd-resolved.service</refname>
- <refname>systemd-resolved</refname>
- <refpurpose>Network Name Resolution manager</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <para><filename>systemd-resolved.service</filename></para>
- <para><filename>/usr/lib/systemd/systemd-resolved</filename></para>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><command>systemd-resolved</command> is a system service that provides network name resolution to local
- applications. It implements a caching and validating DNS/DNSSEC stub resolver, as well as an LLMNR resolver and
- responder. In addition it maintains the <filename>/run/systemd/resolve/resolv.conf</filename> file for
- compatibility with traditional Linux programs. This file may be symlinked from
- <filename>/etc/resolv.conf</filename>.</para>
-
- <para>The glibc NSS module
- <citerefentry><refentrytitle>nss-resolve</refentrytitle><manvolnum>8</manvolnum></citerefentry> is required to
- permit glibc's NSS resolver functions to resolve host names via <command>systemd-resolved</command>.</para>
-
- <para>The DNS servers contacted are determined from the global
- settings in <filename>/etc/systemd/resolved.conf</filename>, the
- per-link static settings in <filename>/etc/systemd/network/*.network</filename> files,
- and the per-link dynamic settings received over DHCP. See
- <citerefentry><refentrytitle>resolved.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- and
- <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details. To improve compatibility,
- <filename>/etc/resolv.conf</filename> is read in order to discover
- configured system DNS servers, but only if it is not a symlink
- to <filename>/run/systemd/resolve/resolv.conf</filename> (see above).</para>
-
- <para><command>systemd-resolved</command> synthesizes DNS RRs for the following cases:</para>
-
- <itemizedlist>
- <listitem><para>The local, configured hostname is resolved to
- all locally configured IP addresses ordered by their scope, or
- — if none are configured — the IPv4 address 127.0.0.2 (which
- is on the local loopback) and the IPv6 address ::1 (which is the
- local host).</para></listitem>
-
- <listitem><para>The hostnames <literal>localhost</literal> and
- <literal>localhost.localdomain</literal> (as well as any hostname
- ending in <literal>.localhost</literal> or <literal>.localhost.localdomain</literal>)
- are resolved to the IP addresses 127.0.0.1 and ::1.</para></listitem>
-
- <listitem><para>The hostname <literal>gateway</literal> is
- resolved to all current default routing gateway addresses,
- ordered by their metric. This assigns a stable hostname to the
- current gateway, useful for referencing it independently of the
- current network configuration state.</para></listitem>
-
- <listitem><para>The mappings defined in <filename>/etc/hosts</filename> are resolved to their configured
- addresses and back.</para></listitem>
- </itemizedlist>
-
- <para>Lookup requests are routed to the available DNS servers
- and LLMNR interfaces according to the following rules:</para>
-
- <itemizedlist>
- <listitem><para>Lookups for the special hostname
- <literal>localhost</literal> are never routed to the
- network. (A few other, special domains are handled the same way.)</para></listitem>
-
- <listitem><para>Single-label names are routed to all local
- interfaces capable of IP multicasting, using the LLMNR
- protocol. Lookups for IPv4 addresses are only sent via LLMNR on
- IPv4, and lookups for IPv6 addresses are only sent via LLMNR on
- IPv6. Lookups for the locally configured host name and the
- <literal>gateway</literal> host name are never routed to
- LLMNR.</para></listitem>
-
- <listitem><para>Multi-label names are routed to all local
- interfaces that have a DNS sever configured, plus the globally
- configured DNS server if there is one. Address lookups from the
- link-local address range are never routed to
- DNS.</para></listitem>
- </itemizedlist>
-
- <para>If lookups are routed to multiple interfaces, the first
- successful response is returned (thus effectively merging the
- lookup zones on all matching interfaces). If the lookup failed on
- all interfaces, the last failing response is returned.</para>
-
- <para>Routing of lookups may be influenced by configuring
- per-interface domain names. See
- <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details. Lookups for a hostname ending in one of the
- per-interface domains are exclusively routed to the matching
- interfaces.</para>
-
- <para>Note that <filename>/run/systemd/resolve/resolv.conf</filename> should not be used directly by applications,
- but only through a symlink from <filename>/etc/resolv.conf</filename>.</para>
-
- <para>See the <ulink url="http://www.freedesktop.org/wiki/Software/systemd/resolved"> resolved D-Bus API
- Documentation</ulink> for information about the APIs <filename>systemd-resolved</filename> provides.</para>
-
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>resolved.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>dnssec-trust-anchors.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>nss-resolve</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd-resolve</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry project='man-pages'><refentrytitle>resolv.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry project='man-pages'><refentrytitle>hosts</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>