схемы именования сетевых устройств (Network device naming schemes)
Описание (Description)
Network interfaces names and MAC addresses may be generated based
on certain stable interface attributes. This is possible when
there is enough information about the device to generate those
attributes and the use of this information is configured. This
page describes interface naming, i.e. what possible names may be
generated. Those names are generated by the
systemd-udevd.service(8) builtin net_id and exported as udev
properties (ID_NET_NAME_ONBOARD=, ID_NET_LABEL_ONBOARD=,
ID_NET_NAME_PATH=, ID_NET_NAME_SLOT=).
Names and MAC addresses are derived from various stable device
metadata attributes. Newer versions of udev take more of these
attributes into account, improving (and thus possibly changing)
the names and addresses used for the same devices. Different
versions of those generation rules are called "naming schemes".
The default naming scheme is chosen at compilation time. Usually
this will be the latest implemented version, but it is also
possible to set one of the older versions to preserve
compatibility. This may be useful for example for distributions,
which may introduce new versions of systemd in stable releases
without changing the naming scheme. The naming scheme may also be
overridden using the net.naming-scheme= kernel command line
switch, see systemd-udevd.service(8). Available naming schemes
are described below.
After the udev properties have been generated, appropriate udev
rules may be used to actually rename devices based on those
properties. See the description of NamePolicy= and
MACAddressPolicy= in systemd.link(5).
Note that while the concept of network interface naming schemes
is primarily relevant in the context of systemd-udevd.service,
the systemd-nspawn(1) container manager also takes it into
account when naming network interfaces, see below.
