Hello all,
I am trying to implement a SPAN port in combination with a KVM guest as
a SPAN monitor. I have two bridges set up, one for guest network and
the other for the SPAN port, in conjunction with a dedicated NIC port
for each bridge (eth1 for guest networking and eth2 for SPAN). I have
the physical switch connected to eth2 sending SPAN output to this
dedicated network port (eth2). I have it working by using modifying the
OVS database's mirror table to mirror traffic from the dedicated SPAN
NIC to the virtual port connected to the VM.
In KVM when a VM is shutdown, the virtual interface is deleted, and when
the VM is started back up, a new interface is created by libvirt and
added to (both) bridges. The issue is that when the new interface is
created, it gets a new UUID, which of course will need to be added back
into the mirror table as the output_port.
Is there any way to get UUID persistence for these virtual interfaces?
If not, is there a clean way to query the DB to get the UUID of a named
port? If I could just consistently get the UUID of the port using a
shell script I can have this working when the VM is started up.
Thanks for your help.
-Sean
P.S.: I am working on documenting this out, as well as my steps for
using bridging with OVS and KVM. If we decide it's helpful I am more
than happy to contribute it.
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