[systemd-devel] 70-persistent-net.rules

[Harald Hoyer]

Am 11.04.2013 12:55, schrieb Reindl Harald:
> 
> 
> Am 11.04.2013 12:41, schrieb Colin Guthrie:
>> 'Twas brillig, and Andrey Borzenkov at 11/04/13 10:25 did gyre and gimble:
>>> On Thu, Apr 11, 2013 at 2:50 AM, Reindl Harald <h.reindl at thelounge.net> wrote:
>>>> /usr/share/doc/systemd/README.Fedora-18
>>>>
>>>> - A hacky workaround that allows udev to rename network interfaces into
>>>>   kernel's ethX namespace has been re-added. This is to support users who still
>>>>   rely on udev rules such as 70-persistent-net.rules generated in previous
>>>>   Fedora releases to name their network interfaces. Note that the workaround is
>>>>   only temporary and will go away in a future Fedora release
>>>> ______________________________________
>>>>
>>>> PLEASE DO NOT remove this mechanism
>>>>
>>>> well, you are not creating it since a long time, BUT do not
>>>> stop use this config file if it is present!
>>>>
>>>
>>> Mmm ... if rules file exists in correct directory it of course will be
>>> used. Or do you mean to not remove auto-generation of this file?
>>
>> Isn't the mechanism used to shuffle around conflictingly named
>> interfaces gone from udev these days (it is after all racy and buggy).
>>
>> If so then things might not work nicely when processing the old rules.
>> Users should be strongly encouraged to migrate to the persistent network
>> interface names which avoids the design flaws inherent with the
>> previously approach.
> 
> that is all nice in theory
> in real life there are THOUSANDS of setups with only one ethernet interface
> there are THOUSANDS of virtual machines with only one network interface
> there are THOUSANDS of virtual machines with only two NICs and no race-problems

Just add "net.ifnames=0 biosdevname=0" to the kernel command line and you don't
need any 70-persistent-net.rules. Udev will not try to rename your interfaces.

Only
$ rpm -qf /lib/udev/rename_device
initscripts-9.45-2.fc19.x86_64

kicks in and renames interfaces according to the ifcfg-* files, if HWADDR is
set, and if there are no conflicts.