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man: document how to use --network-interface= during boot

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Fixes: #18793
This commit is contained in:
Lennart Poettering 2021-03-03 17:28:09 +01:00
parent a60d064748
commit 44a8ad7a24
1 changed files with 48 additions and 31 deletions
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79
man/systemd-nspawn.xml
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@ -801,46 +801,59 @@
<varlistentry>
<term><option>--network-interface=</option></term>
<listitem><para>Assign the specified network interface to the
container. This will remove the specified interface from the
calling namespace and place it in the container. When the
container terminates, it is moved back to the host namespace.
Note that <option>--network-interface=</option> implies
<option>--private-network</option>. This option may be used
more than once to add multiple network interfaces to the
container.</para></listitem>
<listitem><para>Assign the specified network interface to the container. This will remove the
specified interface from the calling namespace and place it in the container. When the container
terminates, it is moved back to the calling namespace. Note that
<option>--network-interface=</option> implies <option>--private-network</option>. This option may be
used more than once to add multiple network interfaces to the container.</para>
<para>Note that any network interface specified this way must already exist at the time the container
is started. If the container shall be started automatically at boot via a
<filename>systemd-nspawn@.service</filename> unit file instance, it might hence make sense to add a
unit file drop-in to the service instance
(e.g. <filename>/etc/systemd/system/systemd-nspawn@foobar.service.d/50-network.conf</filename>) with
contents like the following:</para>
<programlisting>[Unit]
Wants=sys-subsystem-net-devices-ens1.device
After=sys-subsystem-net-devices-ens1.device</programlisting>
<para>This will make sure that activation of the container service will be delayed until the
<literal>ens1</literal> network interface has shown up. This is required since hardware probing is
fully asynchronous, and network interfaces might be discovered only later during the boot process,
after the container would normally be started without these explicit dependencies.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><option>--network-macvlan=</option></term>
<listitem><para>Create a <literal>macvlan</literal> interface
of the specified Ethernet network interface and add it to the
container. A <literal>macvlan</literal> interface is a virtual
interface that adds a second MAC address to an existing
physical Ethernet link. The interface in the container will be
named after the interface on the host, prefixed with
<literal>mv-</literal>. Note that
<option>--network-macvlan=</option> implies
<option>--private-network</option>. This option may be used
more than once to add multiple network interfaces to the
container.</para></listitem>
<listitem><para>Create a <literal>macvlan</literal> interface of the specified Ethernet network
interface and add it to the container. A <literal>macvlan</literal> interface is a virtual interface
that adds a second MAC address to an existing physical Ethernet link. The interface in the container
will be named after the interface on the host, prefixed with <literal>mv-</literal>. Note that
<option>--network-macvlan=</option> implies <option>--private-network</option>. This option may be
used more than once to add multiple network interfaces to the container.</para>
<para>As with <option>--network-interface=</option>, the underlying Ethernet network interface must
already exist at the time the container is started, and thus similar unit file drop-ins as described
above might be useful.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--network-ipvlan=</option></term>
<listitem><para>Create an <literal>ipvlan</literal> interface
of the specified Ethernet network interface and add it to the
container. An <literal>ipvlan</literal> interface is a virtual
interface, similar to a <literal>macvlan</literal> interface,
which uses the same MAC address as the underlying interface.
The interface in the container will be named after the
interface on the host, prefixed with <literal>iv-</literal>.
Note that <option>--network-ipvlan=</option> implies
<option>--private-network</option>. This option may be used
more than once to add multiple network interfaces to the
container.</para></listitem>
<listitem><para>Create an <literal>ipvlan</literal> interface of the specified Ethernet network
interface and add it to the container. An <literal>ipvlan</literal> interface is a virtual interface,
similar to a <literal>macvlan</literal> interface, which uses the same MAC address as the underlying
interface. The interface in the container will be named after the interface on the host, prefixed
with <literal>iv-</literal>. Note that <option>--network-ipvlan=</option> implies
<option>--private-network</option>. This option may be used more than once to add multiple network
interfaces to the container.</para>
<para>As with <option>--network-interface=</option>, the underlying Ethernet network interface must
already exist at the time the container is started, and thus similar unit file drop-ins as described
above might be useful.</para></listitem>
</varlistentry>
<varlistentry>
@ -907,7 +920,11 @@
this option is used, the host side of the Ethernet link will use the <literal>vb-</literal> prefix
instead of <literal>ve-</literal>. Regardless of the used naming prefix the same network interface
name length limits imposed by Linux apply, along with the complications this creates (for details see
above).</para></listitem>
above).</para>
<para>As with <option>--network-interface=</option>, the underlying bridge network interface must
already exist at the time the container is started, and thus similar unit file drop-ins as described
above might be useful.</para></listitem>
</varlistentry>
<varlistentry>