Virtual Bridge "Network" for Sandbox

[Paul O'Rorke]

Thanks Laine,

I will take a look at Open vSwitch, it looks interesting.

I am a generalist, I need to know enough about a lot of things to get 
many different tasks done, but do not have the in depth knowledge 
required to "patch" anything.  If I manage to wrangle a working solution 
should I post it?

Needless to say I would be supportive of said feature being implemented 
by those more competent than I...

Jocularity aside, thanks for the heads up on Open vSwitch.

*Paul O'Rorke*


On 2020-06-29 9:13 a.m., Laine Stump wrote:
> On 6/29/20 11:01 AM, Paul O'Rorke wrote:
>> Hi all,
>>
>> I couldn't find any documentation on this, hopefully someone can 
>> point me in the right direction.
>>
>> I recently set up a sand-boxed environment for our developers. There 
>> are domain controller(s), workstations and servers in there.  The 
>> whole thing is running on a single host using a "Virtual Network" 
>> defined in virt-manager on that host.
>>
>> Now I find I want to add more guests and there are not enough 
>> resources on this one host.  Can I somehow make this Virtual Network 
>> available to two hosts?  I do not want to move to a bridged network 
>> and have to physically join the two hosts with a discrete link when 
>> they are already on the same subnet at the host level.
>>
>> Is that possible?
>
> You might be able to this using OpenvSwitch (iow "probably can, but I 
> don't know the details" :-)) but libvirt doesn't have anything to set 
> it up for you; you would need to create and configure the OVS switch 
> outside of libvirt, then attach the libvirt guests to that switch 
> (using "<interface type='bridge'> ... <virtualport type='openvswitch'> 
> ...")
>
> I've idly thought about having this as a libvirt feature over the 
> years, but as I never have that many guests, it was never a personal 
> priority, and it wasn't immediately clear what was the best way to 
> handle, e.g. DHCP, and routing to the outside. Definitely "patches are 
> welcome" though :-)
>
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