Re: [Devil-linux-develop] Assign network interface names.

[Serge L. <ser...@gm...>]

On 03/24/2012 03:12 PM, Bruce Smith wrote:
>>> I did a little research and it sounds like many virtualized
>>> environments reuse MAC address ranges assigned to other manufacturers,
>>> so I guess they don't want a conflict.
>> I'd say if  we have more than 1 NIC in a VM, we have to fixate name<->  mac
>> regardless of possible conflict (if there is a conflict, we have to re-generate
>> mac addresses - but it's a bit different story). To be honest, I don't
>> understand the reason of ignoring NIC name persistence in VM, but those line
>> were intentionally added - so, the reason apparently exists. It goads my
>> curiosity :)
>
> I don't understand it either.
Hmm. I'll ask udev developers.

>
> Does KVM keep the same Mac address every time it boots the same VM?
> (if not, then it makes sense)
It's configurable. Usually mac addresses are "static" for each VM.
>
>>> Is there a file in /lib/udev/rules.d/ that has a rule to omit KVM
>>> devices?  (like "75-persistent-net-generator.rules")  If so, I'd be
>>> okay with editing the file to remove the VM rules, or just removing
>>> that file.
>> Yes, it's exactly "75-persistent-net-generator.rules" file. Done as a patch
>> because we cannot remove the rules file.
>
> Why can't the file just be removed in the install script?
Technically it's not a problem to remove a file, but it is a rule 
(configuration) file for write_net_rules which generates 
/etc/udev/rules.d/70-persistent-net.rules. It's a pretty big config, we removed 
only a small part from it. If we delete the file, write_net_rules will work 
incorrectly.

Serge