On 6/24/20 12:24 PM, Beniamino Galvani wrote:
> 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
Ahh, I mistakenly thought it was part of the 35network-legacy dracut module.
Thanks
>
>> - 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.
OK thanks for confirming. The documentation around this is sparse and I
couldn't quite
tell which was the right one. I thought maybe we were setting the wrong one and
that's
why NIC renaming wasn't working for me, but it was because of the no udev
helper that I
mention and you confirm below.
>
>> - 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.
Thanks for confirming. After talking with you and the team today I opened a BZ
as we
think it's a current gap in behavior between the old legacy network scripts
approach
and the NM keyfiles only approach. The BZ is:
- https://bugzilla.redhat.com/show_bug.cgi?id=1851279
In our discussions we also discussed two other things that may want to do. I
opened issues
upstream to talk about them:
- https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/479
- https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/480
Thanks again!
Dusty
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