Hi list, 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?
On Wed, Sep 24, 2014 at 10:04:39AM -0400, Alessandro Baggi wrote:
Hi list, 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.
There are a couple of ways to disable it listed here: http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterface...
On Wed, Sep 24, 2014 at 10:20 AM, Jonathan Billings billings@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.
On Wed, Sep 24, 2014 at 9:04 AM, Alessandro Baggi alessandro.baggi@gmail.com wrote:
Hi list, 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?
No experience yet, but it will be very valuable to us if, in fact, the names really are predictable in terms of matching up with the physical connections on similar hardware. Moving an installed disk to a different chassis or restoring a backup on a different box can be painful on systems with a large number of nics that are named in essentially random order like the older systems. So, I think it is a great idea and should have been done that way from the start, but I'm not convinced yet that it will really work on most hardware.
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Alessandro Baggi -
Jonathan Billings -
Les Mikesell