Section 8 · System administration

systemd-network-generator.8

Package: systemd

SYSTEMD−NETWORK−GENERATOR.SERVICE

NAME
SYNOPSIS
DESCRIPTION
KERNEL COMMAND LINE OPTIONS
CREDENTIALS
SEE ALSO

NAME

systemd-network-generator.service, systemd-network-generator − Generate network configuration from the kernel command line

SYNOPSIS

systemd−network−generator.service

/usr/lib/systemd/systemd−network−generator

DESCRIPTION

systemd−network−generator.service is a system service that translates ip= and related settings on the kernel command line (see below) into systemd.network(5), systemd.netdev(5), and systemd.link(5) configuration files understood by systemd-networkd.service(8) and systemd-udevd.service(8).

Files are generated in /run/systemd/network/.

Note: despite the name, this generator executes as a normal systemd service and is not an implementation of the systemd.generator(7) concept.

KERNEL COMMAND LINE OPTIONS

This tool understands the following options:

ip=, nameserver=, rd.route=, rd.peerdns=

Translated into systemd.network(5) files.

In addition to the parameters dracut.cmdline(7) defines the ip= option accepts the special value “link−local”. If selected, the network interfaces will be configured for link−local addressing (IPv4LL, IPv6LL) only, DHCP or IPv6RA will not be enabled.

Added in version 245.

ifname=, net.ifname_policy=

Translated into systemd.link(5) files.

Added in version 245.

vlan=, bond=, bridge=, bootdev=

Translated into systemd.netdev(5) files.

Added in version 245.

See dracut.cmdline(7) and systemd-udevd.service(8) for option syntax and details.

CREDENTIALS

systemd−network−generator supports the service credentials logic as implemented by ImportCredential=/LoadCredential=/SetCredential= (see systemd.exec(5) for details). The following credentials are used when passed in:

network.conf.*, network.link.*, network.netdev.*, network.network.*

These credentials should contain valid networkd.conf(5), systemd.link(5), systemd.netdev(5), systemd.network(5) configuration data. From each matching credential a separate file is created. Example: a passed credential network.link.50−foobar will be copied into a configuration file 50−foobar.link.

Note that the resulting files are created world−readable, it’s hence recommended to not include secrets in these credentials, but supply them via separate credentials directly to systemd−networkd.service.

Added in version 256.

Note that by default the systemd−network−generator.service unit file is set up to inherit the these credentials from the service manager.