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How to Customize a NIC Name
Using a systemd Link File
You can create a systemd https://www.freedesktop.org/software/systemd/man/systemd.link.html[link file] with Ignition configs.
For example, to name NIC with the MAC address `12:34:56:78:9a:bc` to "infra", place a systemd link file at `/etc/systemd/network/25-infra.link` using the xref:producing-ign.adoc[Butane] config snippet shown below:
Example: Customize NIC via systemd Link File
variant: fcos
version: {butane-latest-stable-spec}
storage:
files:
- path: /etc/systemd/network/25-infra.link
mode: 0644
contents:
inline: |
[Match]
MACAddress=12:34:56:78:9a:bc
[Link]
Name=infra
Using Udev Rules
Similarly, also through Ignition configs, to name NIC with the MAC address `12:34:56:78:9a:bc` to "infra", create a https://man7.org/linux/man-pages/man7/udev.7.html[udev rule] at `/etc/udev/rules.d/80-ifname.rules` using the xref:producing-ign.adoc[Butane] config snippet shown below:
Example: Customize NIC via Udev Rules
variant: fcos
version: {butane-latest-stable-spec}
storage:
files:
- path: /etc/udev/rules.d/80-ifname.rules
mode: 0644
contents:
inline: |
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="12:34:56:78:9a:bc", ATTR{type}=="1", NAME="infra"
Networking in the Initramfs via Kernel Arguments
If networking in the initramfs is required, the kernel argument `ifname=` will dynamically create a udev rule to change the name of a NIC.
Currently, unlike other parts of the networking config from the initramfs (e.g. static IPs, hostnames, etc.), these udev rules are not persisted into the real root. If the custom name needs to be applied to the real root, either a link file or udev rule must be created, as shown above. See xref:https://github.com/coreos/fedora-coreos-tracker/issues/553[this issue] for more details.
For example, to give the NIC with the MAC address `12:34:56:78:9a:bc` a name of "infra", provide a `ifname=infra:12:34:56:78:9a:bc` kernel argument. A udev rule would be created in the initramfs like:
# cat /etc/udev/rules.d/80-ifname.rules
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="12:34:56:78:9a:bc", ATTR{type}=="1", NAME="infra"

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# cat /etc/udev/rules.d/80-ifname.rules
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="12:34:56:78:9a:bc", ATTR{type}=="1", NAME="infra"
4 years ago
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Source string description
type: delimited block -
Flags
no-wrap, placeholders:r"`[\w.\/\-_=@&*:$●+~()\] ]*`", read-only
Source string location
./pages/customize-nic.adoc:52
String age
4 years ago
Last updated
a year ago
Source string age
4 years ago
Translation file
pot/master/pages/customize-nic.pot, string 15