[libvirt-users] [netcf] Why netcf can not rename a existing physical interface dynamically by itself?

[jiahu]

On 05/23/2014 04:56 PM, Laine Stump wrote:
> On 05/23/2014 06:46 AM, Jianwei Hu wrote:
>> Hi All,
>>
>> I have a usage question about netcf. Why netcf can not rename a existing physical interface dynamically by itself?
> The name of a physical interface is determined by lower levels of the
> operating system, and can't be modified by netcf. the configuration that
> is setup by netcf can only reference an *existing* physical device nam[root at rhel6 ~]# ip link set name jiahu eth1
> [root at rhel6 ~]# ifconfig jiahu
> jiahu     Link encap:Ethernet  HWaddr 00:1B:21:27:4E:CE
>            BROADCAST MULTICAST  MTU:1500  Metric:1
>            RX packets:0 errors:0 dropped:0 overruns:0 frame:0
>            TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>            collisions:0 txqueuelen:1000
>            RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
>
> [root at rhel6 ~]# ifup jiahu
>
> Determining IP information for jiahu... done.
> e,
> it can't rename it.
OK, thanks, but I think we can use ip command line to rename existing NIC.

[root at rhel6 ~]# ip link set name jiahu eth1
[root at rhel6 ~]# ifconfig jiahu
jiahu     Link encap:Ethernet  HWaddr 00:1B:21:27:4E:CE
           BROADCAST MULTICAST  MTU:1500  Metric:1
           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

[root at rhel6 ~]# ifup jiahu

Determining IP information for jiahu... done.

>> If you have any other method, please share to me, or can we add support for it in netcf?
> One source of information is here:
>
>   
> http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames/
>
> (although that only completely applies to systems running recent
> systemd, e.g. Fedora 20, but not to RHEL6 as you appear to be running)
>
> There is a reference there of how to change an interface name in a
> system that isn't using "predictable network interface names" (or
> biosdevname, which was a short-lived alternative attempt at a solution
> to the same problem): modify the file
> /etc/udev/rules.d/70-persistent-net.rules. You'll need to reboot the
> system for this to take effect.
>