My name is Andreea and I am a member of LiSA team. LiSA stands for Linux
Switching Appliance and offers a software switch that switches
packets at Layer 2 and Layer 3. It is an open source project under development,
you can find more about it from lisa.mindbit.ro or from
https://github.com/lisa-project/.
One of the development directions of LiSA is to integrate it into libvirt.
First I'll state the motivation for such an integration and then I will
describe a use case.
The main reasons for extending libvirt network component with LiSA are related
to the fact that different hypervisors offer different switching engines with
different capabilities. By integrating LiSA into libvirt, the virtual machines
would connect to LiSA switch ports as they were linked through a physical
switch. Hence, with LiSA, the switching engine would offer the same switching
capabilities independent of hypervisor.
Moreover, if I understand correctly, in libvirt switching configurations are
possible either through a set of commands in virsh or directly within a XML
file. One of LiSA components is swcli that is a CLI for configuring and
retrieving configurations of the software switch. Through swcli, the switching
configurations (including VLANs, trunk or access mode interfaces etc.) are made
through a CISCO-IOS like set of commands. I think this is a nice-to-have
because it would separate complex network configurations from NIC
configuration. That is, through libvirt the machines would just connect to the
switch and other switching configurations, simple or complex, would be made
from swcli. In other words, the XML file would remain simple and readable while
the user would still be able to make switching specific configurations. In
conclusion, LiSA and libvirt would make a great
team for building a complex networking model, without complicating the setup of
a virtual network.
Scenario of where LiSA fits into libvirt
===========================
I thought at the following scenario: two virtual machines linked together
through a LiSA switch, i.e. the LiSA switch being the physical machine running
LiSA. We, LiSA team, started by studying the virt-manager interface and figured
out that an entry in the "Source device" drop down list when configuring a
domain NIC should suffice our goal for the moment. When applying these changes,
the XML configuration file should contain an interface tag of type
"lisa-switch" or something similar. Therefore, a patch to libvirt for
integrating LiSA would contain:
- the implementation of two functions
- virNetDevLisaAddPort
- virNetDevLisaRemovePort
- and a new interface type (XML level) for network configuration.
I would like to have your feedback on the ideas above.
Thanks,
Andreea
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