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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | SYNOPSIS | DESCRIPTION | CONFIGURATION FILES | SEE ALSO | COLOPHON |
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SYSTEMD-N...D.SERVICE(8) systemd-networkd.serviceSYSTEMD-N...D.SERVICE(8)
systemd-networkd.service, systemd-networkd - Network manager
systemd-networkd.service
/usr/lib/systemd/systemd-networkd
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).
See org.freedesktop.network1(5) and org.freedesktop.LogControl1(5)
for a description of the D-Bus API.
The configuration files are read from the files located in the
system network directory /usr/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).
networkctl(1), systemd(1), systemd.link(5), systemd.network(5),
systemd.netdev(5), systemd-networkd-wait-online.service(8),
systemd-network-generator.service(8), org.freedesktop.network1(5)
This page is part of the systemd (systemd system and service
manager) project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have a
bug report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-08-11.) If you discover any rendering
problems in this HTML version of the page, or you believe there is
a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
systemd 258~rc2 SYSTEMD-N...D.SERVICE(8)
Pages that refer to this page: networkctl(1), resolvectl(1), systemd-nspawn(1), systemd-vmspawn(1), hostname(5), networkd.conf(5), org.freedesktop.network1(5), org.freedesktop.resolve1(5), resolved.conf(5), systemd.link(5), systemd.netdev(5), systemd.network(5), timesyncd.conf(5), systemd.directives(7), systemd.index(7), systemd.system-credentials(7), systemd-networkd-wait-online.service(8), systemd-network-generator.service(8), systemd-resolved.service(8), systemd-timesyncd.service(8)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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