mininet/examples/popen.py at nat-cmd · infinityhacks/mininet

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#!/usr/bin/python

"""

This example monitors a number of hosts using host.popen() and

pmonitor()

"""

from mininet.net import Mininet

from mininet.node import CPULimitedHost

from mininet.topo import SingleSwitchTopo

from mininet.log import setLogLevel

from mininet.util import custom, pmonitor

def monitorhosts( hosts=5, sched='cfs' ):

"Start a bunch of pings and monitor them using popen"

mytopo = SingleSwitchTopo( hosts )

cpu = .5 / hosts

myhost = custom( CPULimitedHost, cpu=cpu, sched=sched )

net = Mininet( topo=mytopo, host=myhost )

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:

print "<%s>: %s" % ( host.name, line.strip() )

# Done

net.stop()

if __name__ == '__main__':

setLogLevel( 'info' )

monitorhosts( hosts=5 )