lantz
f0c726a42f
This helps with virtualenv although it can open up another security hole if you end up using an unexpected python interpreter. Overall it seems to make sense to err on the side of usability but it's good to be aware of security. However, for the remaining utility scripts that require python 2, we explicitly note this with #!/usr/bin/python2.
71 lines
2.0 KiB
Python
Executable File
71 lines
2.0 KiB
Python
Executable File
#!/usr/bin/env 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 time import sleep
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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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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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