[CentOS] Centos 7 + SystemD + Predictable Network Interface Names

Wed Sep 24 15:44:00 UTC 2014
Les Mikesell <lesmikesell at gmail.com>

On Wed, Sep 24, 2014 at 10:20 AM, Jonathan Billings <billings at negate.org> wrote:
>> I'm trying Centos7 and using systemD. I've noticed that interfaces
>> name does not have anymore eth0,eth1, ethN but a different name.
>> What do you think about predictable network if name assigned by systemd?
> For what its worth, there was a change in device naming in CentOS 6
> (going from eth0 -> em1, for example) which affected a subset of
> hardware out there (We saw it on Dell hardware, mostly).  We had
> already managed to deal with the fact tha 'eth0' is no longer
> guarenteed (in scripts, usually by looking in /sys/class/net/), so
> dealing with non-eth0-naming wasn't a huge surprise, however, the way
> devices are named changed.  For what it's worth, I am not thrilled
> with the incredibly complex names but I understand their utility.

eth0 was never guaranteed to be the 'right' interface - or even to
exist in some circumstances with udev naming.  If scripts using fixed
names ever worked it was mostly a matter of luck.

   Les Mikesell
     lesmikesell at gmail.com