Virtual Bridge "Network" for Sandbox

[Laine Stump]

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 :-)