[ovirt-users] Nested oVirt : Unofficial network recommendations wanted

[Edward Haas]

On Fri, Sep 16, 2016 at 1:32 PM, Nicolas Ecarnot <nicolas at ecarnot.net>
wrote:

> Le 15/09/2016 à 23:27, Edward Haas a écrit :
>
>
>
> On Thu, Sep 15, 2016 at 3:43 PM, Nicolas Ecarnot <nicolas at ecarnot.net>
> wrote:
>
>> Hello,
>>
>> I'm trying to setup a nested oVirt for the first time, and according to
>> what I read around and experience, some special network settings have to be
>> chosen.
>>
>> For this first try, the bare-metal host is a Debian, running KVM, and the
>> virtual NICs are setup as macvtap in VEPA mode.
>>
>
> On what device you attached it? Bridge? the physical nic?
>
>
> On my physical host, ifconfig is showing the following devices :
> - lo, obviously
> - eth0, primary used
> - wlan0, not used, WIFI...
> - virbr0
> - virbr0-nic
>
> The last two devices were created when installing and playing with the KVM
> Virtual Machine Manager.
>
> When trying to assign one of them to a VM, the only choices are :
> - NAT
> - eth0: macvtap
> - wlan0: macvtap
> - custom
>
> and the source mode can be chosen between :
> - Bridge
> - VEPA
> - Private
> - Passthrough
>
> My main goal is simplicity, and I'd rather use simple bridging, no NAT,
> simple.
>
> What would be the simplest choice?
>

With Virtual Machine Manager you can edit-connection details and create
bridges on the host that you can connect to.
I usually use an isolated network, that does not connect to the outside
world and is limited to the host. If I need it to access the outside world,
I can either connect one of the nics to the bridge created on the host or
just create another vnic that uses nat/macvtap.
Note that VMM is mainly focused on simple VM connectivity, using it for
nested virtualization is not simple and will require from you additional
effort.


>
>
>> I'm not up to date with macvtap, but I think I understood that one of its
>> limit was that no packet could be exchanged between the host and the
>> guests. So far, this is leading me to access my own local VMs from another
>> host. Too bad.
>>
>
> I'm also witnessing frequent loss of packets.
>>
>> So far, I'm also seeing that guests can not ping each others, so I'm not
>> going further before having solved these basic issues.
>>
>
> By definition: http://virt.kernelnewbies.org/MacVTap
>
>
>>
>
> I'm remembering the good old times of lots of bridges where my VMs could
>> be reached by anyone (this was desired), but virt manager is not offering
>> me this choice. I also would like to avoid NAT for other reasons.
>>
>> To you all (4) people who are playing with nested oVirt :
>> - which is your preferred bare metal OS?
>> - which is your preferred guest (first virt level) OS?
>> - which network setups and modes are working best?
>>
>> Thank you.
>>
>> --
>> Nicolas ECARNOT
>> _______________________________________________
>> Users mailing list
>> Users at ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
>
>
> --
> Nicolas ECARNOT
>
>
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