找不到所需的可执行 ovs 控制器：Mininet

Question

sudo python Topology.py 
N = 6
*** Creating network
*** Adding controller
*** Adding hosts:
a b c d e u 
*** Adding switches:
s1 s2 
*** Adding links:
(5.00Mbit 3ms delay 2% loss) *** Error: RTNETLINK answers: No such file or directory
(5.00Mbit 3ms delay 2% loss) *** Error: RTNETLINK answers: No such file or directory
(a, s1) (5.00Mbit 3ms delay 2% loss) *** Error: RTNETLINK answers: No such file or directory
(5.00Mbit 3ms delay 2% loss) *** Error: RTNETLINK answers: No such file or directory
(b, s1) (5.00Mbit 3ms delay 2% loss) *** Error: RTNETLINK answers: No such file or directory
(5.00Mbit 3ms delay 2% loss) *** Error: RTNETLINK answers: No such file or directory
(c, s2) (5.00Mbit 3ms delay 2% loss) *** Error: RTNETLINK answers: No such file or directory
(5.00Mbit 3ms delay 2% loss) *** Error: RTNETLINK answers: No such file or directory
(d, s2) (5.00Mbit 3ms delay 2% loss) *** Error: RTNETLINK answers: No such file or directory
(5.00Mbit 3ms delay 2% loss) *** Error: RTNETLINK answers: No such file or directory
(e, s1) Traceback (most recent call last):
  File "Topology.py", line 45, in <module>
    perfTest()
  File "Topology.py", line 33, in perfTest
    net = Mininet(topo=topo,host=CPULimitedHost,link=TCLink,controller=OVSController)
  File "/usr/lib/python2.7/dist-packages/mininet/net.py", line 172, in __init__
    self.build()
  File "/usr/lib/python2.7/dist-packages/mininet/net.py", line 442, in build
    self.buildFromTopo( self.topo )
  File "/usr/lib/python2.7/dist-packages/mininet/net.py", line 429, in buildFromTopo
    self.addLink( **params )
  File "/usr/lib/python2.7/dist-packages/mininet/net.py", line 364, in addLink
    link = cls( node1, node2, **options )
  File "/usr/lib/python2.7/dist-packages/mininet/link.py", line 534, in __init__
    params2=params )
  File "/usr/lib/python2.7/dist-packages/mininet/link.py", line 424, in __init__
    node1, node2, deleteIntfs=False )
  File "/usr/lib/python2.7/dist-packages/mininet/link.py", line 468, in makeIntfPair
    deleteIntfs=deleteIntfs )
  File "/usr/lib/python2.7/dist-packages/mininet/util.py", line 194, in makeIntfPair
    ( intf1, intf2, cmdOutput ) )
Exception: Error creating interface pair (s1-eth4,s2-eth4): RTNETLINK answers: File exists

这是我运行实现 mininet 的 python 程序时出现的错误。 我找到了一个关于相同问题的线程，但没有一种方法对我有用。

这是我的代码：

#! /usr/bin/python

from mininet.topo import Topo
from mininet.net import Mininet
from mininet.util import dumpNodeConnections
from mininet.log import setLogLevel
from mininet.node import OVSController,CPULimitedHost
from mininet.link import TCLink
from mininet.cli import CLI

class SingleSwitchTopo(Topo):
    "Single switch connected to n hosts"
    def build(self,n=2):
        print('N = %s' %(n))
        switch_1 = self.addSwitch('s1')
        switch_2 = self.addSwitch('s2')
        host=self.addHost('a')
        self.addLink(host,switch_1,bw=5,delay='3ms',loss=2,max_queue_size=300)
        host=self.addHost('b')
        self.addLink(host,switch_1,bw=5,delay='3ms',loss=2,max_queue_size=300)
        host=self.addHost('e')
        self.addLink(host,switch_1,bw=5,delay='3ms',loss=2,max_queue_size=300)
        host=self.addHost('c')
        self.addLink(host,switch_2,bw=5,delay='3ms',loss=2,max_queue_size=300)
        host=self.addHost('d')
        self.addLink(host,switch_2,bw=5,delay='3ms',loss=2,max_queue_size=300)
        host=self.addHost('u')
        self.addLink(host,switch_2,bw=5,delay='3ms',loss=2,max_queue_size=300)
        self.addLink(switch_1,switch_2,bw=15,delay='2ms')

def perfTest():
    topo = SingleSwitchTopo(6)
    net = Mininet(topo=topo,host=CPULimitedHost,link=TCLink,controller=OVSController)
    net.start()
    print "Dumping the Node Information"
    dumpNodeConnections(net.hosts)
    print "Testing the network connectivity"
    net.pingAll()
    CLI(net)
    net.stop()

if __name__ == '__main__':
    #Start mininet using perfTest Function
    setLogLevel('info')
    perfTest()

我正在尝试添加 6 台主机和 2 台交换机。有什么解决办法吗？

与此问题相关的类似帖子：Mininet Cannot find required executable controller

试过一切都是上面的线程。没有什么对我有用。

Answer 1

您的问题取决于单个开关拓扑。

当您通过 perfTest 调用函数时尝试传递 6

class SingleSwitchTopo(Topo):
  "Single switch connected to n hosts."
  def __init__(self, n=2, **opts):
    Topo.__init__(self, **opts)
    switch = self.addSwitch('s1')
    for h in range(n):
      host = self.addHost('h%s' % (h + 1))
      self.addLink(host, switch) 

如果问题仍然存在，请尝试使用 pox (pox) 等控制器配置您的代码