[Engine-devel] bridgless networks

[Roy Golan]

----- Original Message -----
> From: "Itamar Heim" <iheim at redhat.com>
> To: "Roy Golan" <rgolan at redhat.com>
> Cc: engine-devel at ovirt.org
> Sent: Thursday, February 9, 2012 10:02:03 AM
> Subject: Re: [Engine-devel] bridgless networks
> 
> On 02/06/2012 04:47 PM, Roy Golan wrote:
> > Hi All
> >
> > Lately I've been working on a design of bridge-less network feature
> > in the engine.
> > You can see it in
> > http://www.ovirt.org/wiki/Features/Design/Network/Bridgeless_Networks#Bridge-less_Networks
> >
> > Please review the design.
> > Note, there are some open issues, you can find in the relevant
> > section.
> > Reviews and comments are very welcome.
> 
> 1. validations
> 1.1. do you block setting a logical network to don't allow running
> VMs
> if it has a vnic associated with it?
> 1.2. do you check on import a vnic isn't connected to a logical
> network
> which doesn't allow running VMs?
> 1.3. do you check when REST API tries to add/edit a vnic that the
> chosen
> logical network is allowed to run VMs?
> 
> 2. changes
> 2.1 can a logical network be changed between allow/disallow running
> VMs?
> 2.2 what's the flow when enabling running VMs? will the logical
> network
> become non-operational until all hosts are reconfigured with a bridge
> (if applicable)?
> what is the user flow to reconfigure the hosts (go one by one? do
> what
> (there is no change to host level config)?
> 2.3 what's the flow to not allowing to run VMs (bridge-less) - no
> need
> to make the network non operational, but same question - what should
> the
> admin do to reconfigure the hosts (no host level config change is
> needed
> by him, just a reconfigure iiuc)
> 
> Thanks,
>     Itamar
> 


Since it will take some time till we'll add a type to a nic, the whole concept of
enforcing bridging in the migration domain, namely the cluster, should be replaced with much more simple
approach - set bridged true/false during the attach action on the host (i.e setupnetworks).

This means there are no monitoring checks, no new fields to logical networks and no validations but
migration might fail in case the target network is not bridged and the underlying nic is not vNic etc.

Once we will support nic types it will be easy to add the ability to mark a network as "able to run VMs" to 
advice the attach nic action, based on the nic type to set a bridge or not. 

thoughts?