resolved: add a generic DnsSearchDomain concept

[thirdparty/systemd.git] / man / resolved.conf.xml

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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

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<refentry id="resolved.conf" conditional='ENABLE_RESOLVED'
    xmlns:xi="http://www.w3.org/2001/XInclude">
  <refentryinfo>
    <title>resolved.conf</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>resolved.conf</refentrytitle>
    <manvolnum>5</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>resolved.conf</refname>
    <refname>resolved.conf.d</refname>
    <refpurpose>Network Name Resolution configuration files</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <para><filename>/etc/systemd/resolved.conf</filename></para>
    <para><filename>/etc/systemd/resolved.conf.d/*.conf</filename></para>
    <para><filename>/run/systemd/resolved.conf.d/*.conf</filename></para>
    <para><filename>/usr/lib/systemd/resolved.conf.d/*.conf</filename></para>
  </refsynopsisdiv>

  <refsect1>
    <title>Description</title>

    <para>These configuration files control local DNS and LLMNR
    name resolution.</para>

  </refsect1>

  <xi:include href="standard-conf.xml" xpointer="main-conf" />

  <refsect1>
    <title>Options</title>

    <variablelist class='network-directives'>

      <varlistentry>
        <term><varname>DNS=</varname></term>
        <listitem><para>A space-separated list of IPv4 and IPv6
        addresses to be used as system DNS servers. DNS requests are
        sent to one of the listed DNS servers in parallel to any
        per-interface DNS servers acquired from
        <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
        For compatibility reasons, if this setting is not specified,
        the DNS servers listed in
        <filename>/etc/resolv.conf</filename> are used instead, if
        that file exists and any servers are configured in it. This
        setting defaults to the empty list.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>FallbackDNS=</varname></term>
        <listitem><para>A space-separated list of IPv4 and IPv6
        addresses to be used as the fallback DNS servers. Any
        per-interface DNS servers obtained from
        <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
        take precedence over this setting, as do any servers set via
        <varname>DNS=</varname> above or
        <filename>/etc/resolv.conf</filename>. This setting is hence
        only used if no other DNS server information is known. If this
        option is not given, a compiled-in list of DNS servers is used
        instead.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>Domains=</varname></term>
        <listitem><para>A space-separated list of search domains.  For
        compatibility reasons, if this setting is not specified, the
        search domains listed in <filename>/etc/resolv.conf</filename>
        are used instead, if that file exists and any domains are
        configured in it. This setting defaults to the empty
        list.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>LLMNR=</varname></term>
        <listitem><para>Takes a boolean argument or
        <literal>resolve</literal>. Controls Link-Local Multicast Name
        Resolution support (<ulink
        url="https://tools.ietf.org/html/rfc4795">RFC 4794</ulink>) on
        the local host. If true, enables full LLMNR responder and
        resolver support. If false, disables both. If set to
        <literal>resolve</literal>, only resolution support is enabled,
        but responding is disabled. Note that
        <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
        also maintains per-interface LLMNR settings. LLMNR will be
        enabled on an interface only if the per-interface and the
        global setting is on.</para></listitem>
      </varlistentry>

    </variablelist>
  </refsect1>

  <refsect1>
      <title>See Also</title>
      <para>
      <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd-resolved.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
      <citerefentry><refentrytitle>resolv.conf</refentrytitle><manvolnum>4</manvolnum></citerefentry>
      </para>
  </refsect1>

</refentry>