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#!/usr/bin/env python
"Monitor multiple hosts using popen()/pmonitor()"
from time import time
from signal import SIGINT
from mininet.net import Mininet
from mininet.topo import SingleSwitchTopo
from mininet.util import pmonitor
from mininet.log import setLogLevel, info
def pmonitorTest( N=3, seconds=10 ):
"Run pings and monitor multiple hosts using pmonitor"
topo = SingleSwitchTopo( N )
net = Mininet( topo, waitConnected=True )
net.start()
hosts = net.hosts
info( "Starting test...\n" )
server = hosts[ 0 ]
popens = {}
for h in hosts:
popens[ h ] = h.popen('ping', server.IP() )
info( "Monitoring output for", seconds, "seconds\n" )
endTime = time() + seconds
for h, line in pmonitor( popens, timeoutms=500 ):
if h:
info( '<%s>: %s' % ( h.name, line ) )
if time() >= endTime:
for p in popens.values():
p.send_signal( SIGINT )
net.stop()
if __name__ == '__main__':
setLogLevel( 'info' )
pmonitorTest()
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