| carlosmscabral | f40ecd1 | 2013-02-01 18:15:58 -0200 | [diff] [blame] | 1 | #!/usr/bin/python |
| 2 | |
| 3 | """ |
| 4 | This example monitors a number of hosts using host.popen() and |
| 5 | pmonitor() |
| 6 | """ |
| 7 | |
| 8 | from mininet.net import Mininet |
| 9 | from mininet.node import CPULimitedHost |
| 10 | from mininet.topo import SingleSwitchTopo |
| 11 | from mininet.log import setLogLevel |
| 12 | from mininet.util import custom, pmonitor |
| 13 | |
| 14 | def monitorhosts( hosts=5, sched='cfs' ): |
| 15 | "Start a bunch of pings and monitor them using popen" |
| 16 | mytopo = SingleSwitchTopo( hosts ) |
| 17 | cpu = .5 / hosts |
| 18 | myhost = custom( CPULimitedHost, cpu=cpu, sched=sched ) |
| 19 | net = Mininet( topo=mytopo, host=myhost ) |
| 20 | net.start() |
| 21 | # Start a bunch of pings |
| 22 | popens = {} |
| 23 | last = net.hosts[ -1 ] |
| 24 | for host in net.hosts: |
| 25 | popens[ host ] = host.popen( "ping -c5 %s" % last.IP() ) |
| 26 | last = host |
| 27 | # Monitor them and print output |
| 28 | for host, line in pmonitor( popens ): |
| 29 | if host: |
| 30 | print "<%s>: %s" % ( host.name, line.strip() ) |
| 31 | # Done |
| 32 | net.stop() |
| 33 | |
| 34 | if __name__ == '__main__': |
| 35 | setLogLevel( 'info' ) |
| 36 | monitorhosts( hosts=5 ) |