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diff --git a/man/nss-resolve.xml b/man/nss-resolve.xml new file mode 100644 index 0000000..960d580 --- /dev/null +++ b/man/nss-resolve.xml @@ -0,0 +1,95 @@ +<?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> + + <!-- synchronize with other nss-* man pages and factory/etc/nsswitch.conf --> +<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> |