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#!/usr/bin/env python
"""
This example monitors a number of hosts using host.popen() and
pmonitor()
"""
from mininet.net import Mininet
from mininet.topo import SingleSwitchTopo
from mininet.log import setLogLevel, info
from mininet.util import pmonitor
def monitorhosts( hosts=5 ):
"Start a bunch of pings and monitor them using popen"
mytopo = SingleSwitchTopo( hosts )
net = Mininet( topo=mytopo, waitConnected=True )
net.start()
# Start a bunch of pings
popens = {}
last = net.hosts[ -1 ]
for host in net.hosts:
popens[ host ] = host.popen( "ping -c5 %s" % last.IP() )
last = host
# Monitor them and print output
for host, line in pmonitor( popens ):
if host:
info( "<%s>: %s" % ( host.name, line ) )
# Done
net.stop()
if __name__ == '__main__':
setLogLevel( 'info' )
monitorhosts( hosts=5 )
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