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,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 topologiesbuild(): 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 nameaddHost(): adds a host to a topology and returns the host nameaddLink(): 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 networkstart(): starts your networkpingAll(): tests connectivity by trying to have all nodes ping each otherstop(): stops your networknet.hosts: all the hosts in a networkdumpNodeConnections(): 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/pythonfrom mininet.topo import Topofrom mininet.net import Mininetfrom mininet.util import irange,dumpNodeConnectionsfrom mininet.log import setLogLevelclass 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 hostsh1 h2 h3 h4 h5 h6 h7 h8 h9 h10 *** Starting controllerc0 *** Starting 2 switchess1 s2 ...Dumping host connectionsh1 h1-eth0:s1-eth1h2 h2-eth0:s1-eth2h3 h3-eth0:s1-eth3h4 h4-eth0:s1-eth4h5 h5-eth0:s1-eth5h6 h6-eth0:s2-eth1h7 h7-eth0:s2-eth2h8 h8-eth0:s2-eth3h9 h9-eth0:s2-eth4h10 h10-eth0:s2-eth5Testing network connectivity*** Ping: testing ping reachabilityh1 -> 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 controllersc0 *** Stopping 11 links...........*** Stopping 2 switchess1 s2 *** Stopping 10 hostsh1 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 ：
shell 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