[Engine-devel] Network Wiring

[Simon Grinberg]

----- Original Message -----
> From: "Livnat Peer" <lpeer at redhat.com>
> To: "Alona Kaplan" <alkaplan at redhat.com>
> Cc: "Simon Grinberg" <simon at redhat.com>, engine-devel at ovirt.org
> Sent: Tuesday, November 20, 2012 8:57:20 AM
> Subject: Re: [Engine-devel] Network Wiring
> 
> On 18/11/12 17:06, Alona Kaplan wrote:
> > 
> >>> <snip>
> >>>
> >>>>>> purge a network while it is connected to VMs: Link-Down on
> >>>>>> all
> >>>>>> nics
> >>>>>> and connect to the empty/no network. (Yes I know, it's not
> >>>>>> par
> >>>>>> of
> >>>>>> the
> >>>>>> feature, but you know someone will ask for it soon :))
> >>>>>
> >>>>> It should not be hard to implement; In
> >>>>> http://wiki.ovirt.org/wiki/Feature/DetailedNetworkWiring#New_API
> >>>>> I
> >>>>> suggest passing
> >>>>> no 'network' element to mean "connected to nothing".
> >>>>>
> >>>> I don't really understand why changing the link state to down is
> >>>> not enough?
> >>>> What is the added value of connecting "unwired" nic to a none
> >>>> network?
> >>>
> >>> It is not a big deal of a difference, but the semantics of having
> >>> no
> >>> network is clear: you can run the VM if networks are missing, you
> >>> can
> >>> remove a network when the VM is running. When a VM is associated
> >>> to
> >>> a
> >>> network, but its link state is down, the "right" semantics is
> >>> more
> >>> vague.
> >>
> >> Indeed :)
> >>
> >> Plus consider the use case of hooks providing the networking -
> >> they
> >> still need the engine to assign the MAC and type (like the CISCO
> >> hook).
> >> If you force a logical network on each nic, it means you have to
> >> invent a dummy LN and define it as non-required and set the global
> >> config to allow VMs to run on hosts that do not have this networks
> >> -
> >> Too messy. Though sometimes desirable since the network name may
> >> be
> >> a hint to the hook, there are cases it's not.
> >>
> >> -> No LN means this VM can run on any host! with implicit
> >> assumption
> >> that someone else takes care of connecting it to the proper
> >> network.
> >>
> >> Note that in this case you may still want the network with link
> >> state
> >> up and be allowed to bring the link up/down so it's for sure not
> >> the
> >> case as 'unwired/link down but connected to arbitrary network'
> >>
> > 
> > I"ve added "none" network option to the wiki.
> > Any more comments? Do we have green light to start working on the
> > feature?
> 
> +1 for the high level design naming and behavior.

+1 as well, I think we've converged here. 

> 
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> 
>