Bob Lantz
ee15ce2243
Although we could use print() from __future__, this messes up scripts which use examples as modules. The simple, if not nicest for 2.7, solution is to use info(), output() and other mininet.log functions. The disadvantage is that we may have to adjust things if we change info() to add automatic newlines, but we can burn that bridge in Mininet 3.x.
38 lines
1.0 KiB
Python
Executable File
38 lines
1.0 KiB
Python
Executable File
#!/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, info
|
|
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:
|
|
info( "<%s>: %s" % ( host.name, line ) )
|
|
# Done
|
|
net.stop()
|
|
|
|
if __name__ == '__main__':
|
|
setLogLevel( 'info' )
|
|
monitorhosts( hosts=5 )
|