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4.6.4. I/O Statistics

To get the network statistics, you'll need the name of the host interface that the domain is connected to (usually vnetX). To find it, retrieve the domain XML description (libvirt modifies it at the runtime). Then, look for devices/interface/target[@dev] element(s):

Example 4.45. Get the network I/O statistics

#!/usr/bin/env python3
import sys
import libvirt
from xml.etree import ElementTree

domName = 'Fedora22-x86_64-1'

conn = None
    conn ="qemu:///system")
except libvirt.libvirtError as e:
    print(repr(e), file=sys.stderr)

dom = conn.lookupByID(5)
if dom == None:
    print('Failed to find the domain '+domName, file=sys.stderr)

tree = ElementTree.fromstring(dom.XMLDesc())
iface = tree.find('devices/interface/target').get('dev')
stats = dom.interfaceStats(iface)
print('read bytes:    '+str(stats[0]))
print('read packets:  '+str(stats[1]))
print('read errors:   '+str(stats[2]))
print('read drops:    '+str(stats[3]))
print('write bytes:   '+str(stats[4]))
print('write packets: '+str(stats[5]))
print('write errors:  '+str(stats[6]))
print('write drops:   '+str(stats[7]))

The interfaceStats method returns the number of bytes (packets) received (transmitted), and the number of reception/transmission errors.