128 lines
5.6 KiB
XML
128 lines
5.6 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
|
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
|
|
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
|
|
<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
|
|
|
|
<refentry id="nss-mymachines" conditional='ENABLE_NSS_MYMACHINES'>
|
|
|
|
<refentryinfo>
|
|
<title>nss-mymachines</title>
|
|
<productname>systemd</productname>
|
|
</refentryinfo>
|
|
|
|
<refmeta>
|
|
<refentrytitle>nss-mymachines</refentrytitle>
|
|
<manvolnum>8</manvolnum>
|
|
</refmeta>
|
|
|
|
<refnamediv>
|
|
<refname>nss-mymachines</refname>
|
|
<refname>libnss_mymachines.so.2</refname>
|
|
<refpurpose>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 plug-in module for the GNU Name Service Switch (NSS) functionality of
|
|
the GNU C Library (<command>glibc</command>), providing hostname resolution for the 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. This
|
|
functionality only applies to containers using network namespacing (see the description of
|
|
<option>--private-network</option> in
|
|
<citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>).
|
|
Note that the name that is resolved is the one registered with <command>systemd-machined</command>, which
|
|
may be different than the hostname configured inside of the container.</para>
|
|
|
|
<para>To activate the NSS module, add <literal>mymachines</literal> to the line starting with
|
|
<literal>hosts:</literal> in <filename>/etc/nsswitch.conf</filename>.</para>
|
|
|
|
<para>It is recommended to place <literal>mymachines</literal> before the <literal>resolve</literal> or
|
|
<literal>dns</literal> entry of the <literal>hosts:</literal> line of
|
|
<filename>/etc/nsswitch.conf</filename> in order to make sure that its mappings are preferred over other
|
|
resolvers such as DNS.</para>
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Configuration in <filename>/etc/nsswitch.conf</filename></title>
|
|
|
|
<para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables
|
|
<command>nss-mymachines</command> correctly:</para>
|
|
|
|
<!-- synchronize with other nss-* man pages and factory/etc/nsswitch.conf -->
|
|
<programlisting>passwd: compat systemd
|
|
group: compat [SUCCESS=merge] systemd
|
|
shadow: compat
|
|
|
|
hosts: <command>mymachines</command> resolve [!UNAVAIL=return] files myhostname dns
|
|
networks: files
|
|
|
|
protocols: db files
|
|
services: db files
|
|
ethers: db files
|
|
rpc: db files
|
|
|
|
netgroup: nis</programlisting>
|
|
|
|
</refsect1>
|
|
|
|
<refsect1>
|
|
<title>Example: Mappings provided by <filename>nss-mymachines</filename></title>
|
|
|
|
<para>The container <literal>rawhide</literal> is spawned using
|
|
<citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>:
|
|
</para>
|
|
|
|
<programlisting># systemd-nspawn -M rawhide --boot --network-veth --private-users=pick
|
|
Spawning container rawhide on /var/lib/machines/rawhide.
|
|
Selected user namespace base 20119552 and range 65536.
|
|
...
|
|
|
|
$ machinectl --max-addresses=3
|
|
MACHINE CLASS SERVICE OS VERSION ADDRESSES
|
|
rawhide container systemd-nspawn fedora 30 169.254.40.164 fe80::94aa:3aff:fe7b:d4b9
|
|
|
|
$ ping -c1 rawhide
|
|
PING rawhide(fe80::94aa:3aff:fe7b:d4b9%ve-rawhide (fe80::94aa:3aff:fe7b:d4b9%ve-rawhide)) 56 data bytes
|
|
64 bytes from fe80::94aa:3aff:fe7b:d4b9%ve-rawhide (fe80::94aa:3aff:fe7b:d4b9%ve-rawhide): icmp_seq=1 ttl=64 time=0.045 ms
|
|
...
|
|
$ ping -c1 -4 rawhide
|
|
PING rawhide (169.254.40.164) 56(84) bytes of data.
|
|
64 bytes from 169.254.40.164 (169.254.40.164): icmp_seq=1 ttl=64 time=0.064 ms
|
|
...
|
|
|
|
# machinectl shell rawhide /sbin/ip a
|
|
Connected to machine rawhide. Press ^] three times within 1s to exit session.
|
|
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
|
|
...
|
|
2: host0@if21: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
|
|
link/ether 96:aa:3a:7b:d4:b9 brd ff:ff:ff:ff:ff:ff link-netnsid 0
|
|
inet 169.254.40.164/16 brd 169.254.255.255 scope link host0
|
|
valid_lft forever preferred_lft forever
|
|
inet6 fe80::94aa:3aff:fe7b:d4b9/64 scope link
|
|
valid_lft forever preferred_lft forever
|
|
Connection to machine rawhide terminated.
|
|
</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>machinectl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
|
|
<citerefentry><refentrytitle>nss-systemd</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>
|