[CentOS-virt] turning off udev for eth0

Wed Jan 4 08:48:35 UTC 2012
Grant McWilliams <grantmasterflash at gmail.com>

On Tue, Jan 3, 2012 at 8:52 AM, James B. Byrne <byrnejb at harte-lyne.ca>wrote:

> I have set up a kvm host and configured a standard clone
> prototype for generating new guests. One persistent (pun
> intended) annoyance when cloning is the behaviour of udev
> with respect to the virtual network interface.
> The prototype is configured with just eth0 having a
> dedicated IP addr.  When the prototype is cloned udev
> creates rules for both eth0 and eth1 in the clone.
> Because eth1 does not exist in the cloned guest one has to
> manually edit /etc/udev/rules.d/70-persistent-net.rules to
> get rid of the bogus entries and then restart the clone
> instance to have the changes take effect. All this does is
> return the new guest to the prototype eth0 configuration.
> Is there no way to alter udev's behaviour?  Is udev even
> needed on a server system using virtual hardware?
> Altering the rules file not a big deal in itself but it
> adds needless busywork when setting up a new guest.
> --
> ***          E-Mail is NOT a SECURE channel          ***
> James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
> Harte & Lyne Limited          http://www.harte-lyne.ca
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> Hamilton, Ontario             fax: +1 905 561 0757
> Canada  L8E 3C3
I do this on VM clones. It depends on your OS but where I've had to do it
is with Ubuntu VMs. I'm not sure where exactly they set that in CentOS but
I'd start looking in /lib/udev/rules.d/75-persistent-net-generator.rules

Grant McWilliams
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