[systemd-devel] Udev won't rename interfaces that are already UP

[Reindl Harald]

Am 18.02.2015 um 21:12 schrieb Mantas Mikulėnas:
> On Wed, Feb 18, 2015 at 10:10 PM, Giancarlo Razzolini
> <grazzolini at gmail.com <mailto:grazzolini at gmail.com>> wrote:
>
>     But, in both cases, I need to flush the interface and set it
>     status to DOWN before the initramfs handle the init to systemd. I took a
>     look at the: src/udev/udev-builtin-net_id.c file and it seems indeed
>     that it won't rename an interface that is UP. An error is shown in the
>     journalctl by udev saying the interface couldn't be renamed. I do handle
>     with this already, but I was wondering if systemd-udevd shouldn't rename
>     the interface regardless of it state, since the early userspace
>
> It's so much not that udev won't do this – the kernel actually won't let
> it to:
>
> # ip link set eth0 up
> # ip link set eth0 name fred0
> RTNETLINK answers: Device or resource busy

and hopefully that keeps this way

* configurations rely on eth0, eth1... exists
* they are sane and fine
* firewall rules may depend on them

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