mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-12-24 21:34:08 +03:00
08540a9591
This adds -Dnss-resolve= and -Dnss-mymachines= meson options. By using this option, e.g., resolved can be built without nss-resolve. When no nss modules are built, then test-nss is neither built. Also, This changes the option name -Dmyhostname= to -Dnss-myhostname= for consistency to other nss related options. Closes #9596.
95 lines
4.0 KiB
XML
95 lines
4.0 KiB
XML
<?xml version='1.0'?>
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
|
|
<!--
|
|
SPDX-License-Identifier: LGPL-2.1+
|
|
-->
|
|
|
|
<refentry id="nss-resolve" conditional='ENABLE_NSS_RESOLVE'>
|
|
|
|
<refentryinfo>
|
|
<title>nss-resolve</title>
|
|
<productname>systemd</productname>
|
|
</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>. Specifically, it is recommended to place
|
|
<literal>resolve</literal> early in <filename>/etc/nsswitch.conf</filename>'s <literal>hosts:</literal> line (but
|
|
after the <literal>files</literal> or <literal>mymachines</literal> entries), right before the
|
|
<literal>dns</literal> entry if it exists, followed by <literal>[!UNAVAIL=return]</literal>, to ensure DNS queries
|
|
are always routed via
|
|
<citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry> if it is
|
|
running, but are routed to <command>nss-dns</command> if this service is not available.</para>
|
|
|
|
<para>Note that <command>systemd-resolved</command> will synthesize DNS resource
|
|
records in a few cases, for example for <literal>localhost</literal> and the
|
|
current hostname, see
|
|
<citerefentry><refentrytitle>systemd-resolved</refentrytitle><manvolnum>8</manvolnum></citerefentry>
|
|
for the full list. This duplicates the functionality of
|
|
<citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
|
|
but it is still recommended (see examples below) to keep
|
|
<command>nss-myhostname</command> configured in
|
|
<filename>/etc/nsswitch.conf</filename>, to keep those names resolveable if
|
|
<command>systemd-resolved</command> is not running.</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>
|
|
</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>
|