About brvirt

brvirt displays bridges and enclosed interfaces along with corresponding KVM Virtual Machines names and virsh domain ids.

It answers one simple question: How to determine which virtual interface belongs to which virtual machine and what bridge it is in?"

Requirements

The script is compatible with python2.7 and python3+.

• brvirt uses virsh tool to list VM properties and virtual network interfaces. To install virsh use:

 # on Debian-based distros:
sudo apt-get install libvirt-bin

 # on RHEL based:
sudo yum install libvirt

• Apart from virsh, the script relies on tabulate python package to render console tables:

TABULATE_INSTALL=lib-only pip install tabulate

Usage

As simple as python brvirt.py will produce the following output which combines brctl and virsh domiflist commands output:

(brvirt) [root@leo ~]# python brvirt.py
+----------+---------------+-----------+-------------+--------------------+
| Bridge   | Interface     | VM name   | Domain ID   | Int. MAC address   |
|----------+---------------+-----------+-------------+--------------------|
| br0      | eno1          |           |             | 28:80:23:90:ea:28  |
|          | vnet0         | cobbler   | 8           | 52:54:00:5a:a9:2c  |
|          | vnet4         | nuage-dns | 4           | 52:54:00:db:45:92  |
| br1      | eno2          |           |             | 28:80:23:90:ea:29  |
|          | vnet1         | cobbler   | 8           | 52:54:00:9b:c2:dc  |
| br999    | eno2.999@eno2 |           |             | 28:80:23:90:ea:29  |
+----------+---------------+-----------+-------------+--------------------+