man/systemd-networkd.service.xml

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   2 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
   3         "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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   8   Copyright 2013 Tom Gundersen
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  23
  24 <refentry id="systemd-networkd.service" conditional='ENABLE_NETWORKD'>
  25
  26         <refentryinfo>
  27                 <title>systemd-networkd.service</title>
  28                 <productname>systemd</productname>
  29
  30                 <authorgroup>
  31                         <author>
  32                                 <contrib>Developer</contrib>
  33                                 <firstname>Tom</firstname>
  34                                 <surname>Gundersen</surname>
  35                                 <email>teg@jklm.no</email>
  36                         </author>
  37                 </authorgroup>
  38         </refentryinfo>
  39
  40         <refmeta>
  41                 <refentrytitle>systemd-networkd.service</refentrytitle>
  42                 <manvolnum>8</manvolnum>
  43         </refmeta>
  44
  45         <refnamediv>
  46                 <refname>systemd-networkd.service</refname>
  47                 <refname>systemd-networkd</refname>
  48                 <refpurpose>Network manager</refpurpose>
  49         </refnamediv>
  50
  51         <refsynopsisdiv>
  52                 <para><filename>systemd-networkd.service</filename></para>
  53                 <para><filename>/usr/lib/systemd/systemd-networkd</filename></para>
  54         </refsynopsisdiv>
  55
  56         <refsect1>
  57                 <title>Description</title>
  58
  59                 <para><command>systemd-networkd</command> is a system
  60                 service that manages networks. It detects and configures
  61                 network devices as they appear, as well as creating virtual
  62                 network devices.</para>
  63
  64                 <para>Network configurations applied before networkd is started
  65                 are not removed, and configuration applied by networkd are not
  66                 removed when networkd exits. This ensures restarting networkd
  67                 does not cut the network connection, and, in particular, that
  68                 it is safe to transition between the initrd and the real root,
  69                 and back.</para>
  70         </refsect1>
  71
  72         <refsect1><title>Configuration Files</title>
  73                 <para>The configuration files are read from the files located in the
  74                 system network directory <filename>/usr/lib/systemd/network</filename>,
  75                 the volatile runtime network directory
  76                 <filename>/run/systemd/network</filename> and the local administration
  77                 network directory <filename>/etc/systemd/network</filename>.
  78                 All configuration files are collectively sorted and processed in lexical order,
  79                 regardless of the directories in which they live. However, files with
  80                 identical filenames replace each other. Files in
  81                 <filename>/etc</filename> have the highest priority, files in
  82                 <filename>/run</filename> take precedence over files with the same
  83                 name in <filename>/usr/lib</filename>. This can be used to override a
  84                 system-supplied configuration file with a local file if needed; a symlink in
  85                 <filename>/etc</filename> with the same name as a configuration file in
  86                 <filename>/usr/lib</filename>, pointing to <filename>/dev/null</filename>,
  87                 disables the configuration file entirely.</para>
  88
  89                 <refsect2><title>Virtual Network Devices</title>
  90                         <para>Netdev files must have the extension <filename>.netdev</filename>;
  91                         other extensions are ignored. Virtual network devices are created as soon
  92                         as networkd is started.</para>
  93
  94                         <para>The <literal>[Netdev]</literal> section accepts the following
  95                         keys:</para>
  96
  97                         <variablelist class='network-directives'>
  98                                 <varlistentry>
  99                                         <term><varname>Name</varname></term>
 100                                         <listitem>
 101                                                 <para>The interface name used when creating the
 102                                                 bridge. This option is compulsory.</para>
 103                                         </listitem>
 104                                 </varlistentry>
 105                                 <varlistentry>
 106                                         <term><varname>Kind</varname></term>
 107                                         <listitem>
 108                                                 <para>The netdev kind. Currently, 'bridge' and 'bond' are
 109                                                 supported. This option is compulsory.</para>
 110                                         </listitem>
 111                                 </varlistentry>
 112                         </variablelist>
 113                 </refsect2>
 114
 115                 <refsect2><title>Networks</title>
 116                         <para>Network files must have the extension <filename>.network</filename>;
 117                         other extensions are ignored. Networks are applied to links whenever the links
 118                         appear.</para>
 119
 120                         <para>The network file contains a <literal>[Match]</literal> section,
 121                         which determines if a given network file may be applied to a given device;
 122                         and a <literal>[Network]</literal> section specifying how the device should
 123                         be configured. The first (in lexical order) of the network files that
 124                         matches a given device is applied.</para>
 125
 126                         <para>A network file is said to match a device if each of the entries in the
 127                         <literal>[Match]</literal> section matches, or if the section is empty.
 128                         The following keys are accepted:</para>
 129
 130                         <variablelist class='network-directives'>
 131                                 <varlistentry>
 132                                         <term><varname>MACAddress</varname></term>
 133                                         <listitem>
 134                                                 <para>The hardware address.</para>
 135                                         </listitem>
 136                                 </varlistentry>
 137                                 <varlistentry>
 138                                         <term><varname>Path</varname></term>
 139                                         <listitem>
 140                                                 <para>The persistent path, as exposed by the udev
 141                                                 property <literal>ID_PATH</literal>.</para>
 142                                         </listitem>
 143                                 </varlistentry>
 144                                 <varlistentry>
 145                                         <term><varname>Driver</varname></term>
 146                                         <listitem>
 147                                                 <para>The driver currently bound to the device, as
 148                                                 exposed by the udev property <literal>DRIVER</literal>.
 149                                                 </para>
 150                                         </listitem>
 151                                 </varlistentry>
 152                                 <varlistentry>
 153                                         <term><varname>Type</varname></term>
 154                                         <listitem>
 155                                                 <para>The device type, as exposed by the udev property
 156                                                 <literal>DEVTYPE</literal>.</para>
 157                                         </listitem>
 158                                 </varlistentry>
 159                                 <varlistentry>
 160                                         <term><varname>Name</varname></term>
 161                                         <listitem>
 162                                                 <para>The device name, as exposed by the udev property
 163                                                 <literal>INTERFACE</literal>.</para>
 164                                         </listitem>
 165                                 </varlistentry>
 166                         </variablelist>
 167
 168                         <para>The <literal>[Network]</literal> section accepts the following keys:</para>
 169
 170                         <variablelist class='network-directives'>
 171                                 <varlistentry>
 172                                         <term><varname>Description</varname></term>
 173                                         <listitem>
 174                                                 <para>A description of the device. This is only used for
 175                                                 presentation purposes.</para>
 176                                         </listitem>
 177                                 </varlistentry>
 178                                 <varlistentry>
 179                                         <term><varname>DHCP</varname></term>
 180                                         <listitem>
 181                                                 <para>A boolean. When true enables basic DHCPv4 support.</para>
 182                                         </listitem>
 183                                 </varlistentry>
 184                                 <varlistentry>
 185                                         <term><varname>Address</varname></term>
 186                                         <listitem>
 187                                                 <para>A static IPv4 or IPv6 address and its prefix length,
 188                                                 separated by a '/' character. The format of the address must
 189                                                 be as described in
 190                                                 <citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>
 191                                                 . This is a short-hand for an [Address] section only containing an Address key (see below).</para>
 192                                         </listitem>
 193                                 </varlistentry>
 194                                 <varlistentry>
 195                                         <term><varname>Gateway</varname></term>
 196                                         <listitem>
 197                                                 <para>The gateway address, which must be in the format described in
 198                                                 <citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>
 199                                                 . This is a short-hand for a [Route] section only containing a Gateway key.</para>
 200                                         </listitem>
 201                                 </varlistentry>
 202                                 <varlistentry>
 203                                         <term><varname>DNS</varname></term>
 204                                         <listitem>
 205                                                 <para>A DNS server address, which must be in the format described in
 206                                                 <citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>
 207                                                 .</para>
 208                                         </listitem>
 209                                 </varlistentry>
 210                                 <varlistentry>
 211                                         <term><varname>Bridge</varname></term>
 212                                         <listitem>
 213                                                 <para>The name of the bridge to add the configured link to.</para>
 214                                         </listitem>
 215                                 </varlistentry>
 216                                 <varlistentry>
 217                                         <term><varname>Bond</varname></term>
 218                                         <listitem>
 219                                                 <para>The name of the bond to add the configured link to.</para>
 220                                         </listitem>
 221                                 </varlistentry>
 222                         </variablelist>
 223
 224                         <para>The <literal>[Address]</literal> section accepts the following keys:</para>
 225
 226                         <variablelist class='network-directives'>
 227                                 <varlistentry>
 228                                         <term><varname>Address</varname></term>
 229                                         <listitem>
 230                                                 <para>As in the <literal>[Network]</literal> section. This key is mandatory.</para>
 231                                         </listitem>
 232                                 </varlistentry>
 233                                 <varlistentry>
 234                                         <term><varname>Label</varname></term>
 235                                         <listitem>
 236                                                 <para>An address label.</para>
 237                                         </listitem>
 238                                 </varlistentry>
 239                         </variablelist>
 240
 241                         <para>The <literal>[Route]</literal> section accepts the following keys:</para>
 242
 243                         <variablelist class='network-directives'>
 244                                 <varlistentry>
 245                                         <term><varname>Gateway</varname></term>
 246                                         <listitem>
 247                                                 <para>As in the <literal>[Network]</literal> section. This key is mandatory.</para>
 248                                         </listitem>
 249                                 </varlistentry>
 250                                 <varlistentry>
 251                                         <term><varname>Destination</varname></term>
 252                                         <listitem>
 253                                                 <para>The destination prefix of the route. Possibly followed by a slash and the
 254                                                 prefixlength, if ommitted a full-length host route is assumed.</para>
 255                                         </listitem>
 256                                 </varlistentry>
 257                         </variablelist>
 258
 259                         <para>The <literal>[DHCPv4]</literal> section accepts the following keys:</para>
 260
 261                         <variablelist class='network-directives'>
 262                                 <varlistentry>
 263                                         <term><varname>UseDNS</varname></term>
 264                                         <listitem>
 265                                                 <para>When true (the default) the DNS servers received from the DHCP server will
 266                                                 be used, and take precedence over any statically configured ones.</para>
 267                                         </listitem>
 268                                 </varlistentry>
 269                                 <varlistentry>
 270                                         <term><varname>UseMTU</varname></term>
 271                                         <listitem>
 272                                                 <para>When true the interface maximum transmission unit from the DHCP server will
 273                                                 be used on the current link. Defaults to false.</para>
 274                                         </listitem>
 275                                 </varlistentry>
 276                                 <varlistentry>
 277                                         <term><varname>UseHostname</varname></term>
 278                                         <listitem>
 279                                                 <para>When true (the default) the hostname received from the DHCP server
 280                                                 will be used as the transient hostname.</para>
 281                                         </listitem>
 282                                 </varlistentry>
 283                        </variablelist>
 284
 285                 </refsect2>
 286         </refsect1>
 287
 288         <refsect1>
 289                 <title>See Also</title>
 290                 <para>
 291                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 292                         <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 293                 </para>
 294         </refsect1>
 295
 296 </refentry>