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.
75 lines
2.4 KiB
Python
Executable File
75 lines
2.4 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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This version uses the user datapath and an explicit control network.
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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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def linkIntfs( node1, node2 ):
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"Create link from node1 to node2 and return intfs"
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link = Link( node1, node2 )
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return link.intf1, link.intf2
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def scratchNetUser( cname='controller', cargs='ptcp:' ):
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"Create network from scratch using user switch."
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# It's not strictly necessary for the controller and switches
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# to be in separate namespaces. For performance, they probably
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# should be in the root namespace. However, it's interesting to
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# see how they could work even if they are in separate namespaces.
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info( '*** Creating Network\n' )
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controller = Node( 'c0' )
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switch = Node( 's0')
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h0 = Node( 'h0' )
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h1 = Node( 'h1' )
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cintf, sintf = linkIntfs( controller, switch )
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h0intf, sintf1 = linkIntfs( h0, switch )
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h1intf, sintf2 = linkIntfs( h1, switch )
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info( '*** Configuring control network\n' )
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controller.setIP( '10.0.123.1/24', intf=cintf )
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switch.setIP( '10.0.123.2/24', intf=sintf)
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info( '*** Configuring hosts\n' )
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h0.setIP( '192.168.123.1/24', intf=h0intf )
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h1.setIP( '192.168.123.2/24', intf=h1intf )
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info( '*** Network state:\n' )
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for node in controller, switch, h0, h1:
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info( str( node ) + '\n' )
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info( '*** Starting controller and user datapath\n' )
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controller.cmd( cname + ' ' + cargs + '&' )
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switch.cmd( 'ifconfig lo 127.0.0.1' )
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intfs = str( sintf1 ), str( sintf2 )
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switch.cmd( 'ofdatapath -i ' + ','.join( intfs ) + ' ptcp: &' )
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switch.cmd( 'ofprotocol tcp:' + controller.IP() + ' tcp:localhost &' )
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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( 'kill %ofdatapath' )
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switch.cmd( 'kill %ofprotocol' )
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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 (user datapath)\n' )
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Mininet.init()
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scratchNetUser()
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