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.
70 lines
2.0 KiB
Python
Executable File
70 lines
2.0 KiB
Python
Executable File
#!/usr/bin/python
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"""
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Build a simple network from scratch, using mininet primitives.
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This is more complicated than using the higher-level classes,
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but it exposes the configuration details and allows customization.
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For most tasks, the higher-level API will be preferable.
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"""
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from mininet.net import Mininet
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from mininet.node import Node
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from mininet.link import Link
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from mininet.log import setLogLevel, info
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from mininet.util import quietRun
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from time import sleep
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def scratchNet( cname='controller', cargs='-v ptcp:' ):
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"Create network from scratch using Open vSwitch."
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info( "*** Creating nodes\n" )
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controller = Node( 'c0', inNamespace=False )
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switch = Node( 's0', inNamespace=False )
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h0 = Node( 'h0' )
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h1 = Node( 'h1' )
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info( "*** Creating links\n" )
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Link( h0, switch )
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Link( h1, switch )
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info( "*** Configuring hosts\n" )
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h0.setIP( '192.168.123.1/24' )
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h1.setIP( '192.168.123.2/24' )
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info( str( h0 ) + '\n' )
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info( str( h1 ) + '\n' )
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info( "*** Starting network using Open vSwitch\n" )
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controller.cmd( cname + ' ' + cargs + '&' )
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switch.cmd( 'ovs-vsctl del-br dp0' )
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switch.cmd( 'ovs-vsctl add-br dp0' )
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for intf in switch.intfs.values():
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switch.cmd( 'ovs-vsctl add-port dp0 %s\n' % intf )
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# Note: controller and switch are in root namespace, and we
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# can connect via loopback interface
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switch.cmd( 'ovs-vsctl set-controller dp0 tcp:127.0.0.1:6633' )
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info( '*** Waiting for switch to connect to controller' )
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while 'is_connected' not in quietRun( 'ovs-vsctl show' ):
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sleep( 1 )
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info( '.' )
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info( '\n' )
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info( "*** Running test\n" )
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h0.cmdPrint( 'ping -c1 ' + h1.IP() )
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info( "*** Stopping network\n" )
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controller.cmd( 'kill %' + cname )
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switch.cmd( 'ovs-vsctl del-br dp0' )
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switch.deleteIntfs()
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info( '\n' )
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if __name__ == '__main__':
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setLogLevel( 'info' )
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info( '*** Scratch network demo (kernel datapath)\n' )
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Mininet.init()
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scratchNet()
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