Re: [Engine-devel] Network Wiring

From: "Livnat Peer" <lpeer(a)redhat.com&gt; To: "Alona Kaplan" <alkaplan(a)redhat.com&gt; Cc: "Simon Grinberg" <simon(a)redhat.com&gt;, engine-devel(a)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.

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