On Tue, Jun 23, 2020 at 11:07:52PM -0400, Dusty Mabe wrote:
Hi, While researching a bug reported against RHEL CoreOS I've decided to look a bit deeper into how a user would go about changing the name of a NIC on a machine to something custom. In this investigation I have some questions: - It seems as if nm-initrd-generator doesn't have support for the ifname= karg. Is that intentional?
Yes, it's intentional; interface renaming is done by the 40-network module: https://github.com/dracutdevs/dracut/blob/050/modules.d/40network/ifname-genrules.sh
- If I specify the nic name and MAC as part of the ip= line the mac specified gets set to
'cloned-mac-address' rather than 'mac-address'. Is that right?
- i.e, ip=192.168.122.111::192.168.122.1:255.255.255.0:initrdhost:nicname:none:0:52:54:00:00:00:0a
-
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/blob/master/src/initrd/nmi-cmdline-reader.c#L583
It's right. The 9th field of an ip= option is the new MAC address to assign to the interface, and so cloned-mac-address is the right property to set. The old network module also uses that field to specify the new MAC.
- Is there a udev helper that parses NM keyfiles and sets up udev rules like /lib/udev/rename_device
does for reading legacy network scripts in /etc/sysconfig/network-scripts/ ?
-
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/consistent-network-interface-device-naming_configuring-and-managing-networking#how-the-network-device-naming-works_consistent-network-interface-device-naming
- https://github.com/fedora-sysv/initscripts/blob/master/src/rename_device.c
I am not aware of such helper for NM keyfiles. Beniamino
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