man/systemd-networkd.service.xml

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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>[Bridge]</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                         </variablelist>
 106                 </refsect2>
 107
 108                 <refsect2><title>Networks</title>
 109                         <para>Network files must have the extension <filename>.network</filename>;
 110                         other extensions are ignored. Networks are applied to links whenever the links
 111                         appear.</para>
 112
 113                         <para>The network file contains a <literal>[Match]</literal> section,
 114                         which determines if a given network file may be applied to a given device;
 115                         and a <literal>[Network]</literal> section specifying how the device should
 116                         be configured. The first (in lexical order) of the network files that
 117                         matches a given device is applied.</para>
 118
 119                         <para>A network file is said to match a device if each of the entries in the
 120                         <literal>[Match]</literal> section matches, or if the section is empty.
 121                         The following keys are accepted:</para>
 122
 123                         <variablelist class='network-directives'>
 124                                 <varlistentry>
 125                                         <term><varname>MACAddress</varname></term>
 126                                         <listitem>
 127                                                 <para>The hardware address.</para>
 128                                         </listitem>
 129                                 </varlistentry>
 130                                 <varlistentry>
 131                                         <term><varname>Path</varname></term>
 132                                         <listitem>
 133                                                 <para>The persistent path, as exposed by the udev
 134                                                 property <literal>ID_PATH</literal>.</para>
 135                                         </listitem>
 136                                 </varlistentry>
 137                                 <varlistentry>
 138                                         <term><varname>Driver</varname></term>
 139                                         <listitem>
 140                                                 <para>The driver currently bound to the device, as
 141                                                 exposed by the udev property <literal>DRIVER</literal>.
 142                                                 </para>
 143                                         </listitem>
 144                                 </varlistentry>
 145                                 <varlistentry>
 146                                         <term><varname>Type</varname></term>
 147                                         <listitem>
 148                                                 <para>The device type, as exposed by the udev property
 149                                                 <literal>DEVTYPE</literal>.</para>
 150                                         </listitem>
 151                                 </varlistentry>
 152                                 <varlistentry>
 153                                         <term><varname>Name</varname></term>
 154                                         <listitem>
 155                                                 <para>The device name, as exposed by the udev property
 156                                                 <literal>INTERFACE</literal>.</para>
 157                                         </listitem>
 158                                 </varlistentry>
 159                         </variablelist>
 160
 161                         <para>The <literal>[Network]</literal> section accepts the following keys:</para>
 162
 163                         <variablelist class='network-directives'>
 164                                 <varlistentry>
 165                                         <term><varname>Description</varname></term>
 166                                         <listitem>
 167                                                 <para>A description of the device. This is only used for
 168                                                 presentation purposes.</para>
 169                                         </listitem>
 170                                 </varlistentry>
 171                                 <varlistentry>
 172                                         <term><varname>Address</varname></term>
 173                                         <listitem>
 174                                                 <para>A static IPv4 or IPv6 address and its prefix length,
 175                                                 separated by a '/' character. The format of the address must
 176                                                 be as described in
 177                                                 <citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>
 178                                                 . This is a short-hand for an [Address] section only containing an Address key (see below).</para>
 179                                         </listitem>
 180                                 </varlistentry>
 181                                 <varlistentry>
 182                                         <term><varname>Gateway</varname></term>
 183                                         <listitem>
 184                                                 <para>The gateway address, which must be in the format described in
 185                                                 <citerefentry><refentrytitle>inet_pton</refentrytitle><manvolnum>3</manvolnum></citerefentry>
 186                                                 . This is a short-hand for a [Route] section only containing a Gateway key.</para>
 187                                         </listitem>
 188                                 </varlistentry>
 189                                 <varlistentry>
 190                                         <term><varname>Bridge</varname></term>
 191                                         <listitem>
 192                                                 <para>The name of the bridge to add the configured link to.</para>
 193                                         </listitem>
 194                                 </varlistentry>
 195                         </variablelist>
 196
 197                         <para>The <literal>[Address]</literal> section accepts the following keys:</para>
 198
 199                         <variablelist class='network-directives'>
 200                                 <varlistentry>
 201                                         <term><varname>Address</varname></term>
 202                                         <listitem>
 203                                                 <para>As in the <literal>[Network]</literal> section.</para>
 204                                         </listitem>
 205                                 </varlistentry>
 206                                 <varlistentry>
 207                                         <term><varname>Label</varname></term>
 208                                         <listitem>
 209                                                 <para>An address label.</para>
 210                                         </listitem>
 211                                 </varlistentry>
 212                         </variablelist>
 213
 214                         <para>The <literal>[Route]</literal> section accepts the following keys:</para>
 215
 216                         <variablelist class='network-directives'>
 217                                 <varlistentry>
 218                                         <term><varname>Gateway</varname></term>
 219                                         <listitem>
 220                                                 <para>As in the <literal>[Network]</literal> section.</para>
 221                                         </listitem>
 222                                 </varlistentry>
 223                                 <varlistentry>
 224                                         <term><varname>Destination</varname></term>
 225                                         <listitem>
 226                                                 <para>The destination prefix of the route. Possibly followed by a slash and the
 227                                                 prefixlength, if ommitted a full-length host route is assumed.</para>
 228                                         </listitem>
 229                                 </varlistentry>
 230                        </variablelist>
 231                 </refsect2>
 232         </refsect1>
 233
 234         <refsect1>
 235                 <title>See Also</title>
 236                 <para>
 237                         <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
 238                         <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
 239                 </para>
 240         </refsect1>
 241
 242 </refentry>