·期末作业验收
期末作业
负载均衡程序
小组分工
小组：incredible five
构建拓扑：俞鋆
编写程序：陈绍纬、周龙荣
程序调试和视频录制：陈辉、林德望
程序思路
初步搭建场景二拓扑
from mininet.topo import Topoclass MyTopo( Topo ): def __init__( self ): # Initialize topology Topo.__init__( self ) # Add hosts and switches h1 = self.addHost( 'h1' ) h2 = self.addHost( 'h2' ) h3 = self.addHost( 'h3' ) h4 = self.addHost( 'h4' ) s1 = self.addSwitch( 's1' ) s2 = self.addSwitch( 's2' ) s3 = self.addSwitch( 's3' ) s4 = self.addSwitch( 's4' ) # Add links self.addLink( s1, h1, 1, 0 ) self.addLink( s1, s2, 2, 1 ) self.addLink( s1, s3, 3, 1 ) self.addLink( s1, s4, 4, 1 ) self.addLink( s2, s4, 2, 2 ) self.addLink( s3, s4, 2, 3 ) self.addLink( s4, h2, 4, 0 ) self.addLink( s4, h3, 5, 0 ) self.addLink( s4, h4, 6, 0 )topos = { 'mytopo': ( lambda: MyTopo() ) } 场景二默认包从s1-s4路径发送，所以先给s2、s3下发流表，使之通行。
我们小组没有去底层交换机收集信息，再对数据处理得到动态负载均衡（没掌握好这块内容），最后小组讨论，将s1-s4、s1-s2-s4、s1-s3-s4三条线路默认1：2:2的关系，以经历的线路为基准进行负载均衡。
对s4下发流表，使用hardtime机制，让3条线路在一段时间内的占比为2:1:1以达到负载均衡。#!/usr/bin/python# -*- coding:UTF-8 -*-import httplib2import timeclass OdlUtil: http = httplib2.Http() url = '' def __init__(self, host, port): self.url = 'http://' + host + ':' + port def install_flow(self, container_name='default',username="admin", password="admin"): self.http.add_credentials(username, password) flow_name = 'flow_' + str(int(time.time()*1000)) h2_s4_s2_1 = ''' {"flow-node-inventory:flow": [ {"id": "1","flow-name": "s4_s2_1","cookie": 256, "hard-timeout":4,"instructions": { "instruction": [{"order": 0,"apply-actions": { "action": [{"order": 0,"output-action": { "output-node-connector": "2"}}]}}]}, "priority": 1000,"table_id": 0,"match": { "ipv4-destination": "10.0.0.1/32","in-port": "4", "ethernet-match": {"ethernet-type": {"type": 2048}}}}]} ''' h2_s4_s1_1 = ''' {"flow-node-inventory:flow": [ {"id": "0","flow-name": "s4_s2_1","cookie": 256, "hard-timeout":2,"instructions": { "instruction": [{"order": 0,"apply-actions": { "action": [{"order": 0,"output-action": { "output-node-connector": "1"}}]}}]}, "priority": 1005,"table_id": 0,"match": { "ipv4-destination": "10.0.0.1/32","in-port": "4", "ethernet-match": {"ethernet-type": {"type": 2048}}}}]} ''' h2_s4_s3_1 = ''' {"flow-node-inventory:flow": [ {"id": "2","flow-name": "s4_s2_1","cookie": 256, "hard-timeout":3,"instructions": { "instruction": [{"order": 0,"apply-actions": { "action": [{"order": 0,"output-action": { "output-node-connector": "3"}}]}}]}, "priority": 1002,"table_id": 0,"match": { "ipv4-destination": "10.0.0.1/32","in-port": "4", "ethernet-match": {"ethernet-type": {"type": 2048}}}}]} ''' h3_s4_s2_1=''' {"flow-node-inventory:flow": [ {"id": "4","flow-name": "s4_s2_1","cookie": 256, "hard-timeout":4,"instructions": { "instruction": [{"order": 0,"apply-actions": { "action": [{"order": 0,"output-action": { "output-node-connector": "2"}}]}}]}, "priority": 1000,"table_id": 0,"match": { "ipv4-destination": "10.0.0.1/32","in-port": "5", "ethernet-match": {"ethernet-type": {"type": 2048}}}}]} ''' h3_s4_s1_1 = ''' {"flow-node-inventory:flow": [ {"id": "3","flow-name": "s4_s2_1","cookie": 256, "hard-timeout":2,"instructions": { "instruction": [{"order": 0,"apply-actions": { "action": [{"order": 0,"output-action": { "output-node-connector": "1"}}]}}]}, "priority": 1005,"table_id": 0,"match": { "ipv4-destination": "10.0.0.1/32","in-port": "5", "ethernet-match": {"ethernet-type": {"type": 2048}}}}]} ''' h3_s4_s3_1 = ''' {"flow-node-inventory:flow": [ {"id": "5","flow-name": "s4_s2_1","cookie": 256, "hard-timeout":3,"instructions": { "instruction": [{"order": 0,"apply-actions": { "action": [{"order": 0,"output-action": { "output-node-connector": "3"}}]}}]}, "priority": 1002,"table_id": 0,"match": { "ipv4-destination": "10.0.0.1/32","in-port": "5", "ethernet-match": {"ethernet-type": {"type": 2048}}}}]} ''' h4_s4_s2_1 = ''' {"flow-node-inventory:flow": [ {"id": "7","flow-name": "s4_s2_1","cookie": 256, "hard-timeout":4,"instructions": { "instruction": [{"order": 0,"apply-actions": { "action": [{"order": 0,"output-action": { "output-node-connector": "2"}}]}}]}, "priority": 1000,"table_id": 0,"match": { "ipv4-destination": "10.0.0.1/32","in-port": "6", "ethernet-match": {"ethernet-type": {"type": 2048}}}}]} ''' h4_s4_s1_1 = ''' {"flow-node-inventory:flow": [ {"id": "6","flow-name": "s4_s2_1","cookie": 256, "hard-timeout":2,"instructions": { "instruction": [{"order": 0,"apply-actions": { "action": [{"order": 0,"output-action": { "output-node-connector": "1"}}]}}]}, "priority": 1005,"table_id": 0,"match": { "ipv4-destination": "10.0.0.1/32","in-port": "6", "ethernet-match": {"ethernet-type": {"type": 2048}}}}]} ''' h4_s4_s3_1 = ''' {"flow-node-inventory:flow": [ {"id": "8","flow-name": "s4_s2_1","cookie": 256, "hard-timeout":3,"instructions": { "instruction": [{"order": 0,"apply-actions": { "action": [{"order": 0,"output-action": { "output-node-connector": "3"}}]}}]}, "priority": 1002,"table_id": 0,"match": { "ipv4-destination": "10.0.0.1/32","in-port": "6", "ethernet-match": {"ethernet-type": {"type": 2048}}}}]} ''' headers = {'Content-type': 'application/json'} num=0 while num < 4 : response, content = self.http.request(uri='http://192.168.81.133:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:4/flow-node-inventory:table/0/flow/0', body=h2_s4_s1_1, method='PUT',headers=headers) response, content = self.http.request(uri='http://192.168.81.133:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:4/flow-node-inventory:table/0/flow/1', body=h2_s4_s2_1, method='PUT',headers=headers) response, content = self.http.request(uri='http://192.168.81.133:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:4/flow-node-inventory:table/0/flow/2', body=h2_s4_s3_1, method='PUT',headers=headers) response, content = self.http.request(uri='http://192.168.81.133:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:4/flow-node-inventory:table/0/flow/3', body=h3_s4_s1_1, method='PUT',headers=headers) response, content = self.http.request(uri='http://192.168.81.133:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:4/flow-node-inventory:table/0/flow/4', body=h3_s4_s2_1, method='PUT',headers=headers) response, content = self.http.request(uri='http://192.168.81.133:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:4/flow-node-inventory:table/0/flow/5', body=h3_s4_s3_1, method='PUT',headers=headers) response, content = self.http.request(uri='http://192.168.81.133:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:4/flow-node-inventory:table/0/flow/6', body=h4_s4_s1_1, method='PUT',headers=headers) response, content = self.http.request(uri='http://192.168.81.133:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:4/flow-node-inventory:table/0/flow/7', body=h4_s4_s2_1, method='PUT',headers=headers) response, content = self.http.request(uri='http://192.168.81.133:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:4/flow-node-inventory:table/0/flow/8', body=h4_s4_s3_1, method='PUT',headers=headers) print("success") time.sleep(4) print(content.decode())if __name__=='__main__': odl = OdlUtil('192.168.81.133', '8181') odl.install_flow() 课程总结
SDN只有半学期，但我感觉学到的内容是非常多的。
理论+上机，不仅是课还有作业，这样的形式让我对一些知识掌握程度很高。- 软件定义网络，让我了解到了以后网络的发展前景，它会如何发展，为什么会往这个方向发展。而在SDN中最重要的就是控制器。我也随之了解 odl floodlight ryu这些控制器。
- mininet的使用，如何可视化建立拓扑以及用py语言建立拓扑，一些常规mininet命令的使用。
- odl查看拓扑，下发流表、组表。结合python脚本对odl下发流表。
- 抓包，不过是很表面的了解
- 再一次熟练了ubuntu系统的使用。
负载均衡的原理，如何去实现！！！