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man: document new varlink service
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Lennart Poettering
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@ -108,7 +108,7 @@ example, introspection is not available, and the resolver logic is not used.
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## Other Services
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The `systemd` project provides two other services implementing this
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The `systemd` project provides three other services implementing this
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interface. Specifically:
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1. `io.systemd.DynamicUser` → This service is implemented by the service
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@ -119,6 +119,10 @@ interface. Specifically:
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and provides records for the users and groups defined by the home
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directories it manages.
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3. `io.systemd.Machine` → This service is implemented by
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`systemd-machined.service` and provides records for the users and groups used
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by local containers that use user namespacing.
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Other projects are invited to implement these services too. For example it
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would make sense for LDAP/ActiveDirectory projects to implement these
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interfaces, which would provide them a way to do per-user resource management
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@ -35,8 +35,8 @@
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> (for its
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<varname>DynamicUser=</varname> feature, see
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<citerefentry><refentrytitle>systemd.exec</refentrytitle><manvolnum>5</manvolnum></citerefentry> for
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details) or
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<citerefentry><refentrytitle>systemd-homed.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
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details),
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<citerefentry><refentrytitle>systemd-homed.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>, or <citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>.</para>
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<para>This module also ensures that the root and nobody users and groups (i.e. the users/groups with the UIDs/GIDs
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0 and 65534) remain resolvable at all times, even if they aren't listed in <filename>/etc/passwd</filename> or
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@ -55,7 +55,7 @@
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</refsect1>
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<refsect1>
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<title>Example</title>
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<title>Configuration in <filename>/etc/nsswitch.conf</filename></title>
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<para>Here is an example <filename>/etc/nsswitch.conf</filename> file that enables
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<command>nss-systemd</command> correctly:</para>
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@ -77,6 +77,47 @@ netgroup: nis</programlisting>
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</refsect1>
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<refsect1>
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<title>Example: Mappings provided by <filename>systemd-machined.service</filename></title>
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<para>The container <literal>rawhide</literal> is spawned using
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<citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>:
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</para>
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<programlisting># systemd-nspawn -M rawhide --boot --network-veth --private-users=pick
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Spawning container rawhide on /var/lib/machines/rawhide.
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Selected user namespace base 20119552 and range 65536.
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...
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$ machinectl --max-addresses=3
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MACHINE CLASS SERVICE OS VERSION ADDRESSES
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rawhide container systemd-nspawn fedora 30 169.254.40.164 fe80::94aa:3aff:fe7b:d4b9
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$ getent passwd vu-rawhide-0 vu-rawhide-81
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vu-rawhide-0:*:20119552:65534:vu-rawhide-0:/:/usr/sbin/nologin
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vu-rawhide-81:*:20119633:65534:vu-rawhide-81:/:/usr/sbin/nologin
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$ getent group vg-rawhide-0 vg-rawhide-81
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vg-rawhide-0:*:20119552:
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vg-rawhide-81:*:20119633:
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$ ps -o user:15,pid,tty,command -e|grep '^vu-rawhide'
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vu-rawhide-0 692 ? /usr/lib/systemd/systemd
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vu-rawhide-0 731 ? /usr/lib/systemd/systemd-journald
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vu-rawhide-192 734 ? /usr/lib/systemd/systemd-networkd
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vu-rawhide-193 738 ? /usr/lib/systemd/systemd-resolved
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vu-rawhide-0 742 ? /usr/lib/systemd/systemd-logind
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vu-rawhide-81 744 ? /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only
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vu-rawhide-0 746 ? /usr/sbin/sshd -D ...
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vu-rawhide-0 752 ? /usr/lib/systemd/systemd --user
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vu-rawhide-0 753 ? (sd-pam)
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vu-rawhide-0 1628 ? login -- zbyszek
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vu-rawhide-1000 1630 ? /usr/lib/systemd/systemd --user
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vu-rawhide-1000 1631 ? (sd-pam)
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vu-rawhide-1000 1637 pts/8 -zsh
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</programlisting>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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@ -85,6 +126,9 @@ netgroup: nis</programlisting>
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<citerefentry><refentrytitle>nss-resolve</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>nss-myhostname</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>nss-mymachines</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-userdbd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-homed.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>nsswitch.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
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<citerefentry project='man-pages'><refentrytitle>getent</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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@ -116,6 +116,13 @@
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<citerefentry><refentrytitle>systemd-importd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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is also available, which implements importing, exporting, and downloading of container and VM images.
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</para>
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<para>For each container registered with <filename>systemd-machined.service</filename> that employs user
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namespacing, users/groups are synthesized for the used UIDs/GIDs. These are made available to the system
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using the <ulink url="https://systemd.io/USER_GROUP_API">User/Group Record Lookup API via
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Varlink</ulink>, and thus may be resolved with
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<citerefentry><refentrytitle>userdbctl</refentrytitle><manvolnum>1</manvolnum></citerefentry> or the
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usual glibc NSS calls.</para>
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</refsect1>
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<refsect1>
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@ -186,6 +186,15 @@
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available to the system.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>io.systemd.Machine</constant></term>
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<listitem><para>This service is provided by
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<citerefentry><refentrytitle>systemd-machined.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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and synthesizes records for all users/groups used by a container that employs user
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namespacing.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><constant>io.systemd.Multiplexer</constant></term>
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