Mininet: не удается найти необходимый исполняемый (ref) контроллер ⇐ Linux

[Anonymous]

Код: Выделить всё

sudo mn --version
2.2.2

sudo mn --help
Usage: mn [options]
(type mn -h for details)

The mn utility creates Mininet network from the command line. It can create
parametrized topologies, invoke the Mininet CLI, and run tests.

Options:
-h, --help            show this help message and exit
--switch=SWITCH       default|ivs|lxbr|ovs|ovsbr|ovsk|user[,param=value...]
ovs=OVSSwitch default=OVSSwitch ovsk=OVSSwitch
lxbr=LinuxBridge user=UserSwitch ivs=IVSSwitch
ovsbr=OVSBridge
--host=HOST           cfs|proc|rt[,param=value...]
rt=CPULimitedHost{'sched': 'rt'} proc=Host
cfs=CPULimitedHost{'sched': 'cfs'}
--controller=CONTROLLER
default|none|nox|ovsc|ref|remote|ryu[,param=value...]
ovsc=OVSController none=NullController
remote=RemoteController default=DefaultController
nox=NOX ryu=Ryu ref=Controller
.......
.......

sudo mn --controller ref
*** Creating network
*** Adding controller
*** Adding hosts:
h1 h2
*** Adding switches:
s1
*** Adding links:
(h1, s1) (h2, s1)
*** Configuring hosts
h1 h2
*** Starting controller
c0 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)

Как решить проблему с контроллером?

Подробнее здесь: https://stackoverflow.com/questions/785 ... controller