Am 10.02.22 um 13:48 schrieb Kevin P. Fleming:
Package: systemd
Version: 247.3-6
Severity: normal

Dear Maintainer,

Recently I renamed some *.link files on a headless server (changing the names
inside the files to match), but after rebooting the server I was unable to
access it. After much head-scratching I realized that the previous *.link files
had been copied into the initramfs during a kernel package installation some
time in the past, and the new files conflicted with the old ones, so systemd-
networkd could not bring up the network interfaces.

After searching the bug tracker I see that a number of people have been caught
in this 'trap', and the advice given has been to run update-initramfs after
making changes (or adding) *.link files. While that certainly does cure the
problem, I can't find any documentation in the installed system which would
have lead me to know that I needed to do that.

Have I overlooked documentation of this behavior? It doesn't appear in, and it doesn't appear in the 'networkd' section of
README.Debian.gz for the systemd package. I can't be certain that this is
Debian-specific behavior (an inquiry about that on the systemd-devel list
hasn't elicited any responses), but it's definitely not 'upstream' behavior.

Please consider documenting this in at least those two places in a very obvious
way. I wish there was a more direct way to notify users that an initramfs
update will be required, but short of having a daemon watch
/etc/systemd/network for changes I can't think of any way to do that.

I'd be happy to provide a patch to add this documentation to those two files if
that would be welcome. Thanks for your time and consideration.

A patch (or merge request) for README.Debian would be much appreciated.

I don't think we should start patching the upstream documentation, as this will be a maintenance burden.

Since the renaming is actually done by udev, the documentation should probably go in udev.README.Debian.

It already has some existing notes in that regard which could be extended/amended.

You could cross-reference the udev.README.Debian from systemd.README.Debian to avoid unnecessary duplication.

If you want to learn more about how the actual pieces fit together, see
$ dpkg -L udev | grep initramfs-tools

specifically /usr/share/initramfs-tools/hooks/udev

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