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networkd: add support for resolved hook for DHCP server

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Let's synthesize DNS RRs for leases handed out by our DHCP server. This
way local VMs can have resolvable hostnames locally.

This does not implement reverse look ups for now. We can add this
later in similar fashion.
This commit is contained in:
Lennart Poettering
2025-10-13 09:57:48 +02:00
parent f041d40dee
commit a7fa29b1b5
21 changed files with 434 additions and 15 deletions
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17
man/systemd.network.xml
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@@ -4201,6 +4201,23 @@ ServerAddress=192.168.0.1/24</programlisting>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>LocalLeaseDomain=</varname></term>
<listitem>
<para>Takes a DNS domain name as argument. If specified,
<citerefentry><refentrytitle>systemd-networkd.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
will integrate with
<citerefentry><refentrytitle>systemd-resolved.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
and ensure that the hostnames associated with each handed out DHCP lease may be resolved to the IP
addresses of the lease. The hostnames are suffixed with the specified domain name.</para>
<para>Note that this purely about hostname resolution on the local system, i.e. from programs with
access to the same <filename>systemd-resolved</filename> instances via D-Bus IPC, Varlink IPC, or
the local DNS stub.</para>
<xi:include href="version-info.xml" xpointer="v259"/>
</listitem>
</varlistentry>
</variablelist>
</refsect1>