<para>To configure low-level link settings independently of
networks, see
- <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>
- .</para>
+ <citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
<para>Network configurations applied before networkd is started
are not removed, and static configuration applied by networkd
- is not removed when networkd exits. This ensures restarting
- networkd does not cut the network connection, and, in particular,
+ is not removed when networkd exits. Dynamic configuration applied by
+ networkd may also optionally be left in place on shutdown. This ensures
+ restarting networkd does not cut the network connection, and, in particular,
that it is safe to transition between the initrd and the real root,
and back.</para>
</refsect1>
system network directory <filename>/usr/lib/systemd/network</filename>,
the volatile runtime network directory
<filename>/run/systemd/network</filename> and the local administration
- network directory <filename>/etc/systemd/network</filename>.
- All configuration files are collectively sorted and processed in lexical order,
- regardless of the directories in which they live. However, files with
- identical filenames replace each other. Files in
- <filename>/etc</filename> have the highest priority, files in
- <filename>/run</filename> take precedence over files with the same
- name in <filename>/usr/lib</filename>. This can be used to override a
- system-supplied configuration file with a local file if needed; a symlink in
- <filename>/etc</filename> with the same name as a configuration file in
- <filename>/usr/lib</filename>, pointing to <filename>/dev/null</filename>,
- disables the configuration file entirely.</para>
+ network directory <filename>/etc/systemd/network</filename>.</para>
- <refsect2><title>Virtual Network Devices</title>
- <para>Virtual Network Device files must have the extension
- <filename>.netdev</filename>; other extensions are ignored. Virtual
- network devices are created as soon as networkd is started.</para>
-
- <para>A virtual network device is only created if the
- <literal>[Match]</literal> section matches the current
- environment, or if the section is empty. The following keys are accepted:</para>
-
- <variablelist class='network-directives'>
- <varlistentry>
- <term><varname>Host=</varname></term>
- <listitem>
- <para>Matches against the hostname or machine ID of the
- host. See <literal>ConditionHost=</literal> in
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Virtualization=</varname></term>
- <listitem>
- <para>Checks whether the system is executed in a virtualized
- environment and optionally test whether it is a specific
- implementation. See <literal>ConditionVirtualization=</literal> in
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>KernelCommandLine=</varname></term>
- <listitem>
- <para>Checks whether a specific kernel command line option is
- set (or if prefixed with the exclamation mark unset). See
- <literal>ConditionKernelCommandLine=</literal> in
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Architecture=</varname></term>
- <listitem>
- <para>Checks whether the system is running on a specific
- architecture. See <literal>ConditionArchitecture=</literal> in
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details.
- </para>
- </listitem>
- </varlistentry>
- </variablelist>
-
- <para>The <literal>[NetDev]</literal> section accepts the following
- keys:</para>
-
- <variablelist class='network-directives'>
- <varlistentry>
- <term><varname>Name=</varname></term>
- <listitem>
- <para>The interface name used when creating the
- netdev. This option is compulsory.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Kind=</varname></term>
- <listitem>
- <para>The netdev kind. Currently, <literal>bridge</literal>,
- <literal>bond</literal> and <literal>vlan</literal>
- are supported. This option is compulsory.</para>
- </listitem>
- </varlistentry>
- </variablelist>
-
- <para>The <literal>[VLAN]</literal> section only applies for netdevs of kind <literal>vlan</literal>,
- and accepts the following key:</para>
-
- <variablelist class='network-directives'>
- <varlistentry>
- <term><varname>Id=</varname></term>
- <listitem>
- <para>The VLAN ID to use. An integer in the range 0–4094.
- This option is compulsory.</para>
- </listitem>
- </varlistentry>
- </variablelist>
-
- </refsect2>
-
- <refsect2><title>Networks</title>
- <para>Network files must have the extension <filename>.network</filename>;
- other extensions are ignored. Networks are applied to links whenever the links
- appear.</para>
-
- <para>The network file contains a <literal>[Match]</literal> section,
- which determines if a given network file may be applied to a given device;
- and a <literal>[Network]</literal> section specifying how the device should
- be configured. The first (in lexical order) of the network files that
- matches a given device is applied.</para>
-
- <para>A network file is said to match a device if each of the entries in the
- <literal>[Match]</literal> section matches, or if the section is empty.
- The following keys are accepted:</para>
-
- <variablelist class='network-directives'>
- <varlistentry>
- <term><varname>MACAddress=</varname></term>
- <listitem>
- <para>The hardware address.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Path=</varname></term>
- <listitem>
- <para>The persistent path, as exposed by the udev
- property <literal>ID_PATH</literal>. May contain shell
- style globs.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Driver=</varname></term>
- <listitem>
- <para>The driver currently bound to the device, as
- exposed by the udev property <literal>DRIVER</literal>
- of its parent device, or if that is not set the driver
- as exposed by <literal>ethtool -i</literal> of the
- device itself.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Type=</varname></term>
- <listitem>
- <para>The device type, as exposed by the udev property
- <literal>DEVTYPE</literal>.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Name=</varname></term>
- <listitem>
- <para>The device name, as exposed by the udev property
- <literal>INTERFACE</literal>. May contain shell style
- globs.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Host=</varname></term>
- <listitem>
- <para>Matches against the hostname or machine ID of the
- host. See <literal>ConditionHost=</literal> in
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Virtualization=</varname></term>
- <listitem>
- <para>Checks whether the system is executed in a virtualized
- environment and optionally test whether it is a specific
- implementation. See <literal>ConditionVirtualization=</literal> in
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>KernelCommandLine=</varname></term>
- <listitem>
- <para>Checks whether a specific kernel command line option is
- set (or if prefixed with the exclamation mark unset). See
- <literal>ConditionKernelCommandLine=</literal> in
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details.
- </para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Architecture=</varname></term>
- <listitem>
- <para>Checks whether the system is running on a specific
- architecture. See <literal>ConditionArchitecture=</literal> in
- <citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>
- for details.
- </para>
- </listitem>
- </varlistentry>
- </variablelist>
-
- <para>The <literal>[Network]</literal> section accepts the following keys:</para>
-
- <variablelist class='network-directives'>
- <varlistentry>
- <term><varname>Description=</varname></term>
- <listitem>
- <para>A description of the device. This is only used for
- presentation purposes.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>DHCP=</varname></term>
- <listitem>
- <para>A boolean. When true, enables basic DHCPv4 support.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Address=</varname></term>
- <listitem>
- <para>A static IPv4 or IPv6 address and its prefix length,
- separated by a <literal>/</literal> character. The format of the address must
- be as described in
- <citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- . This is a short-hand for an [Address] section only containing an Address key (see below).</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Gateway=</varname></term>
- <listitem>
- <para>The gateway address, which must be in the format described in
- <citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- . This is a short-hand for a [Route] section only containing a Gateway key.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>DNS=</varname></term>
- <listitem>
- <para>A DNS server address, which must be in the format described in
- <citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- .</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Bridge=</varname></term>
- <listitem>
- <para>The name of the bridge to add the link to.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Bond=</varname></term>
- <listitem>
- <para>The name of the bond to add the link to.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>VLAN=</varname></term>
- <listitem>
- <para>The name of a VLAN to create on the link. This option
- may be specified more than once.</para>
- </listitem>
- </varlistentry>
- </variablelist>
-
- <para>The <literal>[Address]</literal> section accepts the following keys:</para>
-
- <variablelist class='network-directives'>
- <varlistentry>
- <term><varname>Address=</varname></term>
- <listitem>
- <para>As in the <literal>[Network]</literal> section. This key is mandatory.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Broadcast=</varname></term>
- <listitem>
- <para>The broadcast address, which must be in the format described in
- <citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>
- . This key only applies to IPv4 addresses. If it is not given, it is
- derived from the <literal>Address</literal> key.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Label=</varname></term>
- <listitem>
- <para>An address label.</para>
- </listitem>
- </varlistentry>
- </variablelist>
-
- <para>The <literal>[Route]</literal> section accepts the following keys:</para>
-
- <variablelist class='network-directives'>
- <varlistentry>
- <term><varname>Gateway=</varname></term>
- <listitem>
- <para>As in the <literal>[Network]</literal> section. This key is mandatory.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>Destination=</varname></term>
- <listitem>
- <para>The destination prefix of the route. Possibly followed by a slash and the
- prefixlength, if ommitted a full-length host route is assumed.</para>
- </listitem>
- </varlistentry>
- </variablelist>
-
- <para>The <literal>[DHCPv4]</literal> section accepts the following keys:</para>
-
- <variablelist class='network-directives'>
- <varlistentry>
- <term><varname>UseDNS=</varname></term>
- <listitem>
- <para>When true (the default), the DNS servers received from the DHCP server will
- be used and take precedence over any statically configured ones.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>UseMTU=</varname></term>
- <listitem>
- <para>When true, the interface maximum transmission unit from the DHCP server will
- be used on the current link. Defaults to false.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>UseHostname=</varname></term>
- <listitem>
- <para>When true (the default), the hostname received from the DHCP server
- will be used as the transient hostname.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><varname>CriticalConnection=</varname></term>
- <listitem>
- <para>When true, the connection will never be torn down even if the DHCP lease
- expires. This is contrary to the DHCP specification, but may be the best choice
- if, say, the root filesystem relies on this connection. Defaults to false.</para>
- </listitem>
- </varlistentry>
- </variablelist>
-
- </refsect2>
+ <para>Networks are configured in <filename>.network</filename> files, see
+ <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ and virtual network devices are configured in <filename>.netdev</filename> files, see
+ <citerefentry><refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
+ </para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+ <citerefentry><refentrytitle>systemd.link</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.network</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd.netdev</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>systemd-network-wait-online.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
</para>
</refsect1>
~ianmdlvl / elogind.git / blobdiff