nss-mymachines.xml revision b938cb902c3b5bca807a94b277672c64d6767886
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<refentry id="nss-mymachines" conditional='ENABLE_MACHINED'>
<refentryinfo>
<title>nss-mymachines</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-mymachines</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname>nss-mymachines</refname>
<refname>libnss_mymachines.so.2</refname>
<refpurpose>Provide hostname resolution for local
container instances.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<para><filename>libnss_mymachines.so.2</filename></para>
</refsynopsisdiv>
<refsect1>
<title>Description</title>
<para><command>nss-mymachines</command> is a plugin for the GNU
Name Service Switch (NSS) functionality of the GNU C Library
(<command>glibc</command>), providing hostname resolution for
container names of containers running locally that are registered
with
<citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
The container names are resolved to the IP addresses of the
specific container, ordered by their scope.</para>
<para>The module also resolves user IDs used by containers to user
names indicating the container name, and back.</para>
<para>To activate the NSS modules, <literal>mymachines</literal>
has to be added to the lines starting with
<literal>hosts:</literal>, <literal>passwd:</literal> and
<literal>group:</literal> in
<filename>/etc/nsswitch.conf</filename>.</para>
<para>It is recommended to place <literal>mymachines</literal>
near the end of the <filename>nsswitch.conf</filename> lines to
make sure that its mappings are only used as fallback, and any
other mappings, such as DNS or <filename>/etc/hosts</filename>
based mappings, take precedence.</para>
</refsect1>
<refsect1>
<title>Example</title>
<para>Here's an example <filename>/etc/nsswitch.conf</filename>
file that enables <command>mymachines</command> correctly:</para>
<programlisting>passwd: compat <command>mymachines</command>
group: compat <command>mymachines</command>
shadow: compat
hosts: files resolve <command>mymachines</command> 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-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
<citerefentry><refentrytitle>nss-resolve</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>,
<citerefentry project='man-pages'><refentrytitle>getent</refentrytitle><manvolnum>1</manvolnum></citerefentry>
</para>
</refsect1>
</refentry>