[ovirt-users] MAC spoofing for specific VMs

[Christopher Young]

Does anyone see a reason why simply installing the EL7 latest rpm for
this on an ovirt node/RHEV-H system would not work or would be a bad
solution to getting this working with ovirt-node/RHEV-H?  I don't want
to do something that is either lost on reboot or would cause issues in
the future.

Thoughts?

On Tue, May 12, 2015 at 2:24 PM, Christopher Young
<mexigabacho at gmail.com> wrote:
> Yep.  I had found that and applied it.  Great solution!   I actually wrote
> about it to the zen load balancer list.  I will add it here for
> semi-documentation:
>
> ------
>  just wanted to follow-up so that it is documented on how to get this
> working on oVirt/RHEV.  I had to install a VDSM hook to allow mac-spoofing
> as a VM custom property like so (on each node):
>
> yum install vdsm-hook-macspoof
>
> That requires a restart of vdsmd on the node as well as a process on the
> oVirt/RHEV engine:
>
> engine-config -s "UserDefinedVMProperties=macspoof=(true|false)"
>
> Which then requires a restart of the oVirt/RHEV engine.
>
> After that, there will be an available custom properly on the VM called
> 'macspoof' that can be set to 'true'.  Once I did this and shutdown/powered
> on the VMs, the cluster setup now completes successfully.  You learn
> something every day.
>
> Thanks for pointing me in the right direction.  The one thing I wish I had
> on these VMs is the ovirt-guest-agent which would likely work except that
> Debian 6 doesn't seem to have python-ethtool package/deps.  If there are any
> plans to update the version of Debian that ZLB is based on, let me know.
>
> -----
>
> On Tue, May 12, 2015 at 5:43 AM, Dan Kenigsberg <danken at redhat.com> wrote:
>>
>> On Mon, May 11, 2015 at 02:12:22PM -0400, Christopher Young wrote:
>> > I'm working on some load-balancing solutions and they appear to require
>> > MAC
>> > spoofing.  I did some searching and reading and as I understand it, you
>> > can
>> > disable the MAC spoofing protection through a few methods.
>> >
>> > I was wondering about the best manner to enable this for the VMs that
>> > require it and not across the board (if that is even possible).  I'd
>> > like
>> > to just allow my load-balancer VMs to do what they need to, but keep the
>> > others untouched as a security mechanism.
>> >
>> > If anyone has any advice on the best method to handle this scenario, I
>> > would greatly appreciate it.  It seems that this might turn into some
>> > type
>> > of feature request, though I'm not sure if this is something that has to
>> > be
>> > done at the Linux bridge level, the port level, or the VM level.  Any
>> > explanations into that would also help in my education.
>>
>> You can enable mac spoofing per VM or per vNIC using vdsm-hook-macspoof.
>> See more details on the hook's README file
>>
>>
>> https://gerrit.ovirt.org/gitweb?p=vdsm.git;a=blob;f=vdsm_hooks/macspoof/README;h=6bd11c1cb8ba2603d432fc8826eeb35738136c92;hb=79781a1945ceff6849a6a2b66cb5c4a1a5f8d874
>
>