SYSTEMD-NETWORKD.SERVICE(8)systemd-networkd.serviceSYSTEMD-NETWORKD.SERVICE(8)
NAME
systemd-networkd.service, systemd-networkd - Network manager
SYNOPSIS
systemd-networkd.service
/lib/systemd/systemd-networkd
DESCRIPTION
systemd-networkd is a system service that manages networks. It detects
and configures network devices as they appear, as well as creating
virtual network devices.
Certain low-level settings of physical network devices (e.g. device
names and altnames) as well as the creation of SR-IOV virtual functions
on physical network interfaces may be managed by systemd-udevd(8)
according to the contents of systemd.link(5) files.
systemd-networkd will create "virtual" network devices (e.g. bridges
and tunnels) based on the configuration in systemd.netdev(5) files,
respecting the [Match] sections in those files.
systemd-networkd will manage network addresses and routes for any link
for which it finds a .network file with an appropriate [Match] section,
see systemd.network(5). For those links, it will flush existing network
addresses and routes when bringing up the device (except when directed
not to). Any links not matched by one of the .network files will be
ignored. It is also possible to explicitly tell systemd-networkd to
ignore a link by using the Unmanaged=yes option, see
systemd.network(5).
When systemd-networkd exits, it generally leaves existing network
devices and configuration intact. This makes it possible to transition
from the initrd and to restart the service without breaking
connectivity. This also means that when configuration is updated and
systemd-networkd is restarted, netdev interfaces for which
configuration was removed will not be dropped, and may need to be
cleaned up manually.
systemd-networkd may be introspected and controlled at runtime using
networkctl(1).
CONFIGURATION FILES
The configuration files are read from the files located in the system
network directory /lib/systemd/network, the volatile runtime network
directory /run/systemd/network and the local administration network
directory /etc/systemd/network.
Networks are configured in .network files, see systemd.network(5), and
virtual network devices are configured in .netdev files, see
systemd.netdev(5).
SEE ALSO
networkctl(1), systemd(1), systemd.link(5), systemd.network(5),
systemd.netdev(5), systemd-networkd-wait-online.service(8), systemd-
network-generator.service(8)
systemd 252 SYSTEMD-NETWORKD.SERVICE(8)
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