目录
0x00 Mininet
尝试理解一下mininet,话说mininet是基于python编写的，代码结构清晰，简直清醒脱俗（(≧▽≦)/啦啦啦），附上链接mininet,mark一下。
0x01 Important classes, methods, functions
简单记录一下比较重要的类和方法
Important classes, methods, functions and variables in the above code include:
Topo: the base class for Mininet topologies
build(): The method to override in your topology class. Constructor parameters (n) will be passed through to it automatically by Topo.__init__().
addSwitch(): adds a switch to a topology and returns the switch name
addHost(): adds a host to a topology and returns the host name
addLink(): adds a bidirectional link to a topology (and returns a link key, but this is not important). Links in Mininet are bidirectional unless noted otherwise.
Mininet: main class to create and manage a network
start(): starts your network
pingAll(): tests connectivity by trying to have all nodes ping each other
stop(): stops your network
net.hosts: all the hosts in a network
dumpNodeConnections(): dumps connections to/from a set of nodes.
setLogLevel( 'info' | 'debug' | 'output' ): set Mininet's default output level; 'info' is recommended as it provides useful information.
0x02 Sample
自己写了一个简单的，h1~h5链接到s1, h6~h10链接到s2,然后s1和s2互联
一开始想着SingleSwitchTopo的方法来写LinearTopo，结果一直报错，╮(╯_╰)╭，明明人家代码都写好了
SingleSwitchTopo是Single switch connected to k hosts，而Linear topology of k switches, with n hosts per switch
#!/usr/bin/python
from mininet.topo import Topo
from mininet.net import Mininet
from mininet.util import irange,dumpNodeConnections
from mininet.log import setLogLevel
class LinearTopo(Topo):
""
"""Linear topology of k switches, with n hosts per switch."""
""
def __init__(self, k=2, n=5,**opts):
"""k:number of switches (and hosts)"""
"""hconf: host configuration options"""
"""lconf: ling configuration options"""
super(LinearTopo, self).__init__(**opts)
self.n = n
self.k = k
"""creates 2 switchs"""
switch1 = self.addSwitch('s1')
switch2 = self.addSwitch('s2')
"""creates h1~h5 and addLink switch1"""
for i in irange(1,n):
host = self.addHost('h%s' %i)
self.addLink(host,switch1)
"""creates h6~h10 and addLink switch2"""
for i in irange(n+1,n+5):
host =self.addHost('h%s' %i)
self.addLink(host,switch2)
"""addLink switch1 and switch2"""
self.addLink(switch1,switch2)
def simpleTest():
"Create and test a simple network"
topo = LinearTopo(k=2,n=5)
net = Mininet(topo)
#start the network
net.start()
print "Dumping host connections"
dumpNodeConnections(net.hosts)
#test the connections of the network
print "Testing network connectivity"
net.pingAll()
#Test the bandwidth of the h* and h*
print "Testing bandwidth between h1 and h2"
h1, h2 = net.get('h1', 'h2')
net.iperf((h1,h2))
print "Testing bandwidth between h10 and h1"
h10, h1 = net.get('h10', 'h1')
net.iperf((h10,h1))
#stop the network
net.stop()
if __name__== '__main__':
# Tell mininet to print useful information
setLogLevel('info')
simpleTest()
0x04 run in shell
命令行直接运行
#将代码保存到一个文件中
sudo vi test.py
#运行
sudo python test.py
0x05 Output
*** Creating network
*** Adding controller
*** Adding hosts:
h1 h2 h3 h4 h5 h6 h7 h8 h9 h10
*** Adding switches:
s1 s2
*** Adding links:
(h1, s1) (h2, s1) (h3, s1) (h4, s1) (h5, s1) (h6, s2) (h7, s2) (h8, s2) (h9, s2) (h10, s2) (s1, s2)
*** Configuring hosts
h1 h2 h3 h4 h5 h6 h7 h8 h9 h10
*** Starting controller
c0
*** Starting 2 switches
s1 s2 ...
Dumping host connections
h1 h1-eth0:s1-eth1
h2 h2-eth0:s1-eth2
h3 h3-eth0:s1-eth3
h4 h4-eth0:s1-eth4
h5 h5-eth0:s1-eth5
h6 h6-eth0:s2-eth1
h7 h7-eth0:s2-eth2
h8 h8-eth0:s2-eth3
h9 h9-eth0:s2-eth4
h10 h10-eth0:s2-eth5
Testing network connectivity
*** Ping: testing ping reachability
h1 -> h2 h3 h4 h5 h6 h7 h8 h9 h10
h2 -> h1 h3 h4 h5 h6 h7 h8 h9 h10
h3 -> h1 h2 h4 h5 h6 h7 h8 h9 h10
h4 -> h1 h2 h3 h5 h6 h7 h8 h9 h10
h5 -> h1 h2 h3 h4 h6 h7 h8 h9 h10
h6 -> h1 h2 h3 h4 h5 h7 h8 h9 h10
h7 -> h1 h2 h3 h4 h5 h6 h8 h9 h10
h8 -> h1 h2 h3 h4 h5 h6 h7 h9 h10
h9 -> h1 h2 h3 h4 h5 h6 h7 h8 h10
h10 -> h1 h2 h3 h4 h5 h6 h7 h8 h9
*** Results: 0% dropped (90/90 received)
Testing bandwidth between h1 and h2
*** Iperf: testing TCP bandwidth between h1 and h2
*** Results: ['35.8 Gbits/sec', '35.8 Gbits/sec']
Testing bandwidth between h10 and h1
*** Iperf: testing TCP bandwidth between h10 and h1
*** Results: ['36.4 Gbits/sec', '36.4 Gbits/sec']
*** Stopping 1 controllers
c0
*** Stopping 11 links
...........
*** Stopping 2 switches
s1 s2
*** Stopping 10 hosts
h1 h2 h3 h4 h5 h6 h7 h8 h9 h10
*** Done
0x06 Problems
遇到的问题:
一.Mininet只能使用python2使用python3不行，即使用外部库也不行，
二.PyCharm配置root运行文件
一开始我没有使用shell来运行，而是使用了PyCharm来跑，然后出现了一个问题，就是Mininet must run as a root,即必须以管理员身份进行，所以需要在PyCharm上设置管理员运行，具体做法：
- 1.在/usr/bin/目录下新建文件 python_sudo.sh ：
sudo gedit /usr/bin/python_sudo.sh
在文件中写入下列代码：
#! /bin/bash
sudo python $*
- 2.给sh文件赋予权限：
cd /usr/bin/
sudo chmod a+x python_sudo.sh
- 3.编辑visudo(其他工具有点问题):
sudo visudo
- 4.在最后一行输入,然后保存：
%sudo ALL=NOPASSWD: /usr/bin/python
- 5.将pycharm 中的
File→Settings→Project Interpreter
置换为自己写的python_sudo.sh，在下图选中框右边有个小齿轮，点那个进行Add就OK了
- 6.同理可以对python3等进行设定，只要在将python改成对应版本就可以(前提是在这个目录下已安装)
0x07 Paint
一个能用画图工具
sudo apt-get install kolourpaint4
然后搜paint就OK了