Mininet Cannot find required executable controller

问题:

Whenever I want to run sshd.py example in mininet or some custome code I have written myself I get

*** Creating network
*** Adding controller
*** Adding hosts:
h1 h2 h3 h4 h5 
*** Adding switches:
s1 
*** Adding links:
(h1, s1) (h2, s1) (h3, s1) (h4, s1) (h5, s1) 
*** Configuring hosts
h1 h2 h3 h4 h5 
*** Starting controller
Cannot find required executable controller.
Please make sure that it is installed and available in your $PATH:
(/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin)

Though $ sudo mn --test pingall works fine!

I guess I should find the open flow controller executable and add it to the path but I don't know where is it located. but the test create a controller and works fine!

I have tried to reinstalling mininet with

$ ~/mininet/util/install.sh -a or [-fnv]

回答1:

Stumbled upon the same issue with mininet on Ubuntu. Try to explicitly specify the controller class when constructing a Mininet object, e.g. instead of

net = Mininet(topo)

do

from mininet.node import OVSController

net = Mininet(topo = topo, controller = OVSController)

That solved the problem in my case.

回答2:

In the newst versions of OVS, the ovs-controller was renamed to test-controller.

First install the openvswitch-testcontroller if you haven't with the following command:

 sudo apt-get install openvswitch-testcontroller

Second, create a symbolic link to the test-controller:

 sudo ln /usr/bin/ovs-testcontroller /usr/bin/controller 

That works for me.

You also, can review this link: http://installfights.blogspot.com.co/2016/09/cannot-find-required-executable.html

回答3:

I wish the message was like

Cannot find required executable "controller".

Anyway, as long as you have ovs-controller installed e.g. provided by 'openvswitch-controller' package on debian like platform, all you have to do is

sudo ln /usr/bin/ovs-controller /usr/bin/controller

回答4:

I had the same problem and I solved it by installing the new version of mininet (2.1.0). With the 2.0.0 version I couldn't do anything.

回答5:

ubuntu@ubuntu:~$ cd mininet/examples
ubuntu@ubuntu:~/mininet/examples$ dir
baresshd.py  hwintf.py       multipoll.py   scratchnetuser.py
consoles.py  limit.py        multitest.py   simpleperf.py
controllers2.py  linearbandwidth.py  popenpoll.py   sshd.py
controllers.py   milsontest.py       popen.py       tree1024.py
cpu.py       miniedit.py         README     treeping64.py
emptynet.py  multiping.py        scratchnet.py
ubuntu@ubuntu:~/mininet/examples$ nano sshd.py
ubuntu@ubuntu:~/mininet/examples$ sudo python sshd.py

Have you tried this?

OR, if you using sudo mn command then try :

sudo mn --controller=remote

回答6:

I had the same problem, so I removed mininet and instead installing again with "apt-get install mininet", I downloaded the source and installed everything that is included in the Mininet VM. This solved the problem.

Just check out the "Option 2: Native Installation from Source" on the website: http://mininet.org/download/#option-1-mininet-vm-installation-easy-recommended

回答7:

There is a problem with installation as far as I perceived. I tried the mininet VM and everything works fine in it.