def testTopo():
# xterms=True, spawn xterms for all nodes after net.start()
net = Containernet(controller=Controller, link=TCLink, xterms=True)
info("*** Adding controller\n")
net.addController("c0")
info("*** Adding hosts\n")
h1 = net.addDockerHost(
"h1",
dimage="dev_test",
ip="10.0.0.1/24",
docker_args={
"cpuset_cpus": "0",
"nano_cpus": int(1e8),
"hostname": "h1"
},
)
h2 = net.addDockerHost(
"h2",
dimage="dev_test",
ip="10.0.0.2/24",
docker_args={
"cpuset_cpus": "0",
"nano_cpus": int(1e8),
"hostname": "h2"
},
)
h3 = net.addHost("h3", ip="10.0.0.3/24")
h4 = net.addHost("h4", ip="10.0.0.4/24")
info("*** Adding switch\n")
s1 = net.addSwitch("s1")
info("*** Creating links\n")
net.addLinkNamedIfce(s1, h1, bw=10, delay="100ms")
net.addLinkNamedIfce(s1, h2, bw=10, delay="100ms")
net.addLinkNamedIfce(s1, h3, bw=10, delay="100ms")
net.addLinkNamedIfce(s1, h4, bw=10, delay="100ms")
info("*** Starting network\n")
net.start()
info("*** Enter CLI\n")
info("Use help command to get CLI usages\n")
CLI(net)
info("*** Stopping network")
net.stop()
def run_net():
# To be tested parameters at runtime
loss_rates = [30]
net = Containernet(controller=Controller, link=TCLink)
info("*** Adding controller\n")
net.addController("c0")
info("*** Adding hosts\n")
h1 = net.addHost(
"h1",
cls=DockerHost,
dimage="dev_test",
ip="10.0.0.1/24",
docker_args={"cpuset_cpus": "0", "nano_cpus": int(1e8)},
)
h2 = net.addHost(
"h2",
cls=DockerHost,
dimage="dev_test",
ip="10.0.0.2/24",
docker_args={"cpuset_cpus": "0", "nano_cpus": int(1e8)},
)
info("*** Adding switch\n")
s1 = net.addSwitch("s1")
info("*** Creating links\n")
net.addLink(h1, s1, bw=10, delay="100ms", intfName1="h1-s1", intfName2="s1-h1")
net.addLink(h2, s1, bw=10, delay="100ms", intfName1="h2-s1", intfName2="s1-h2")
info("*** Starting network\n")
net.start()
info("**** Testing bandwidth between h1 and h2\n")
net.iperf((h1, h2), l4Type="UDP", udpBw="10M")
info("*** Configure the link loss rate of h1 at runtime\n")
for loss in loss_rates:
print("* The loss rate of h1 is {:.2f}%, unidirectional".format(loss))
print("* Ping test count: %d" % PING_COUNT)
host = net.get("h1")
# INFO: The parent number is defined in mininet/link.py
ret = host.cmd(
"tc qdisc change dev {} {} handle 10: netem loss {}%".format(
"h1-s1", " parent 5:1", loss
)
)
if ret != "":
print("Failed to change loss. Error:%s\n", ret)
ret = h1.cmd("ping -c %d 10.0.0.2" % PING_COUNT)
sent, received = tool.parsePing(ret)
measured = ((sent - received) / float(sent)) * 100.0
print(
"Expected loss rate: {:.2f}%, measured loss rate: {:.2f}%".format(
loss, measured
)
)
info("*** Stopping network")
net.stop()