[ovirt-users] adding an ip on a host that run a vm connected to that bridge

[Nathanaël Blanchet]

Le 17/01/2016 16:38, Dan Kenigsberg a écrit :
> On Fri, Jan 15, 2016 at 05:02:13PM +0100, Nathanaël Blanchet wrote:
>> Why is it forbiden to add an address (static or dhcp) to bridge on a host
>> that runs a vm which is connected to that bridge?
>> As a workaround, I can put manually an address for that bridge on that host
>> and refresh capabilities.
> Historically, Vdsm has modified its network definition by first tearing
> it down, and then setting it up again. The first step cannot succeed if
> the bridge is being used by VMs.
>
> In ovirt-3.6 we have introduced the ability to change the network's
> layer 2 connectivity while VMs are using it. Users can now replace a
> single NIC with a bond, or change the network's vlan ID, without
> migrating the VMs away.
>
> However, we have not implemented a similar change of layer 3
> connectivity. It's doable, but not done (yet?).
>
>> Is it a desired feature?
> You should tell us!
>
> I think it's nice, and would like to see it one day. It would not harm
> if you open an RFE, stating your motivation for this. After all,
> adding/changing an IP address is quite rare, and usually can be
> postponed to a time where the host is not used.
Not totally agree : in my case, I wanted to change the migration network 
from one to an other, but it engine prevents me to do it unless I assign 
an IP address to the dedicated bridge on each host... I fortunately can 
do it with ifconfig/iproute2.
> Dan.

-- 
Nathanaël Blanchet

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