我负责的工作：

（1）、前期工作思路设计及方案选定、讲解

（2）、后期代码修正

（3）、视频制作

负载均衡程序

程序流程图

代码



from mininet.topo import Topo

class MyTopo( Topo ):

    "Simple topology example."

    def __init__( self ):

        # Initialize topology

        Topo.__init__( self )

        sw1 = self.addSwitch('s1')

        sw2 = self.addSwitch('s2')

        sw3 = self.addSwitch('s3')

        sw4 = self.addSwitch('s4')

        h1 = self.addHost('h1')

        h2 = self.addHost('h2')

        h3 = self.addHost('h3')

        h4 = self.addHost('h4')

        self.addLink(h1,sw1,1)

        self.addLink(sw1,sw2,2,1)

        self.addLink(sw1,sw4,3,2)

        self.addLink(sw1,sw3,4,1)

        self.addLink(sw2,sw4,2,1)

        self.addLink(sw3,sw4,2,3)

        self.addLink(sw4,h2,4)

        self.addLink(sw4,h3,5)

        self.addLink(sw4,h4,6)

topos = { 'mytopo': ( lambda: MyTopo() ) }

//拓扑




import httplib2

import time

class OdlUtil:

    url = ''

    def __init__(self, host, port):

        self.url = 'http://' + host + ':' + str(port)

    def install_flow(self, container_name='default',username="admin", password="admin"):

        http = httplib2.Http()

        http.add_credentials(username, password)

        headers = {'Accept': 'application/json'}

        flow_name = 'flow_' + str(int(time.time()*1000))

        h1h4body1 ='{"flow": [{"id": "1","match": {"ethernet-match":'

               	'{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.4/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "4"},"order": "0"}]}}]},'

            	'"priority": "101","cookie": "1","table_id": "0"}]}'

        mh1h4body1 ='{"flow": [{"id": "1","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.4/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "4"},"order": "0"}]}}]},'

            	'"priority": "102","cookie": "1","table_id": "0"}]}'

	h1h4body2 ='{"flow": [{"id": "5","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.4/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "2"},"order": "0"}]}}]},'

            	'"priority": "100","cookie": "5","table_id": "0"}]}'

	mh1h4body2 ='{"flow": [{"id": "5","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.4/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "2"},"order": "0"}]}}]},'

            	'"priority": "102","cookie": "5","table_id": "0"}]}'

	h1h4body3 ='{"flow": [{"id": "6","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.4/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "3"},"order": "0"}]}}]},'

            	'"priority": "99","cookie": "6","table_id": "0"}]}'

	mh1h4body3 ='{"flow": [{"id": "6","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.4/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "3"},"order": "0"}]}}]},'

            	'"priority": "102","cookie": "6","table_id": "0"}]}'

        h1h2body1 ='{"flow": [{"id": "1","match": {"ethernet-match":'

               	'{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.2/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "4"},"order": "0"}]}}]},'

            	'"priority": "101","cookie": "1","table_id": "0"}]}'

        mh1h2body1 ='{"flow": [{"id": "1","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.2/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "4"},"order": "0"}]}}]},'

            	'"priority": "102","cookie": "1","table_id": "0"}]}'

	h1h2body2 ='{"flow": [{"id": "5","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.2/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "2"},"order": "0"}]}}]},'

            	'"priority": "100","cookie": "5","table_id": "0"}]}'

	mh1h2body2 ='{"flow": [{"id": "5","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.2/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "2"},"order": "0"}]}}]},'

            	'"priority": "102","cookie": "5","table_id": "0"}]}'

	h1h2body3 ='{"flow": [{"id": "6","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.2/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "3"},"order": "0"}]}}]},'

            	'"priority": "99","cookie": "6","table_id": "0"}]}'

	mh1h2body3 ='{"flow": [{"id": "6","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.2/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "3"},"order": "0"}]}}]},'

            	'"priority": "102","cookie": "6","table_id": "0"}]}'

        h1h3body1 ='{"flow": [{"id": "1","match": {"ethernet-match":'

               	'{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.3/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "4"},"order": "0"}]}}]},'

            	'"priority": "101","cookie": "1","table_id": "0"}]}'

        mh1h3body1 ='{"flow": [{"id": "1","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.3/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "4"},"order": "0"}]}}]},'

            	'"priority": "102","cookie": "1","table_id": "0"}]}'

	h1h3body2 ='{"flow": [{"id": "5","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.3/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "2"},"order": "0"}]}}]},'

            	'"priority": "100","cookie": "5","table_id": "0"}]}'

	mh1h3body2 ='{"flow": [{"id": "5","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.3/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "2"},"order": "0"}]}}]},'

            	'"priority": "102","cookie": "5","table_id": "0"}]}'

	h1h3body3 ='{"flow": [{"id": "6","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.3/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "3"},"order": "0"}]}}]},'

            	'"priority": "99","cookie": "6","table_id": "0"}]}'

	mh1h3body3 ='{"flow": [{"id": "6","match": {"ethernet-match":'

               '{"ethernet-type": {"type": "2048"}},'

	'"ipv4-source":"10.0.0.1/32","ipv4-destination": "10.0.0.3/32"},'

            	'"instructions": {"instruction": [{"order": "0",'

                '"apply-actions": {"action": [{"output-action": {'

                '"output-node-connector": "3"},"order": "0"}]}}]},'

            	'"priority": "102","cookie": "6","table_id": "0"}]}'

        headers = {'Content-type': 'application/json'}

	num=0

	while num < 4 :

        	response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/1', body=mh1h4body1, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/1', body=mh1h3body1, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/1', body=mh1h2body1, method='PUT',headers=headers)

		time.sleep(0.1)

        	response, content = http.request(uri='http://127.0.01:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/1', body=h1h4body1, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.01:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/5', body=mh1h4body2, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.01:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/1', body=h1h3body1, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.01:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/5', body=mh1h3body2, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.01:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/1', body=h1h2body1, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.01:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/5', body=mh1h2body2, method='PUT',headers=headers)

		time.sleep(0.1)

        	response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/5', body=h1h4body2, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/6', body=mh1h4body3, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/5', body=h1h3body2, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/6', body=mh1h3body3, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/5', body=h1h2body2, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/6', body=mh1h2body3, method='PUT',headers=headers)

		time.sleep(0.1)

        	response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/6', body=h1h4body3, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/6', body=h1h3body3, method='PUT',headers=headers)

        	response, content = http.request(uri='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/6', body=h1h2body3, method='PUT',headers=headers)

        print(content.decode())

odl = OdlUtil('127.0.0.1', '8181')

odl.install_flow()

代码思路

拓扑结构

代码分析

因为对该拓扑结构，只需要在s1处进行负载均衡，s2、s3、s4到任何目的主机或交换机的链路都是唯一的，所以不需要考虑负载均衡。

我们原本打算尝试更复杂一些的可以实现在节点上进行阻塞判断的负载均衡，但因为ODL方面编程的资料我们能找到的不是很充足，而且关于北向接口可以参考的实例程序几乎没有，再加之Python入门水平实在十分有限，因此也一度决定改用Ryu尝试开发，因为我们找到了北邮李呈所写的一个简单的负载均衡，可以进行参考。然而最终也是因为许多接口的用法、代码不能理解而无法成功开发。因为时间有限，又在期末时期学业十分紧张，我们最终选择了在群内学长分析的简单的以Python连接ODL然后下发流表的方式，实现一个简单的分时机制进行负载均衡。具体方法是为每一条链路分配相等时长的时间片，这里设置为0.1s。具体算法的原理是：首先将端口2出发的链路优先级设为最高（102），每一次分配时间片时，将下一条链路的优先级设为最高（102），上一次最高优先级的链路设为最低（当前最低值-1），反复循环，即可实现在2，3，4链路上按分时机制进行负载均衡。

应用到我们选用的具体拓扑上，就是：

2端口，优先级102（最高）
0.1s后
3端口，优先级102
2端口，优先级101（102-1）
0.1s后
4端口，优先级102
3端口，优先级100（101-1）
0.1s后
4端口，优先级99（100-1）

演示视频

SDN负载均衡演示

SDN负载均衡的更多相关文章

  1. SDN期末作业-通过SDN的应用实现负载均衡

    负载均衡程序 1.程序链接:https://github.com/424baopu/software/tree/master/LoadBalance 2.场景 topo: 场景描述: 服务器host ...

  2. SDN期末作业——负载均衡

    作业链接 期末作业 1.负载均衡程序 代码 2.演示视频 地址 3.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 4.个人 ...

  3. 基于SDN网络的负载均衡研究与实现

    为什么需要软件定义网络 1.网络缺乏可扩展性,创新正在停滞不前.   我们最新的研究发现,几乎每两个组织中就有一个认为需要将网络功能扩展为采用SDN的主要业务触发因素,而不是其他催化剂.这一统计数据一 ...

  4. 《SDN期末作业——实现负载均衡》

    队名:取个队名真难 一.网络拓扑(场景二) 二.负载均衡程序 1.建立拓扑的代码 拓扑 2.下发组表流表的代码 下发组表流表 三.演示视频 1.目的 服务器h2,h3,h4上各自有不同的服务,h1是客 ...

  5. SDN第五次上机作业--基于组表的简单负载均衡

    0.作业链接 http://www.cnblogs.com/easteast/p/8125383.html 1.实验目的 1.搭建如下拓扑并连接控制器 2.下发相关流表和组表实现负载均衡 3.抓包分析 ...

  6. 高性能Linux服务器 第11章 构建高可用的LVS负载均衡集群

    高性能Linux服务器 第11章 构建高可用的LVS负载均衡集群 libnet软件包<-依赖-heartbeat(包含ldirectord插件(需要perl-MailTools的rpm包)) l ...

  7. centos LB负载均衡集群 三种模式区别 LVS/NAT 配置 LVS/DR 配置 LVS/DR + keepalived配置 nginx ip_hash 实现长连接 LVS是四层LB 注意down掉网卡的方法 nginx效率没有LVS高 ipvsadm命令集 测试LVS方法 第三十三节课

    centos   LB负载均衡集群 三种模式区别 LVS/NAT 配置  LVS/DR 配置  LVS/DR + keepalived配置  nginx ip_hash 实现长连接  LVS是四层LB ...

  8. 【大型网站技术实践】初级篇：借助LVS+Keepalived实现负载均衡

    一.负载均衡:必不可少的基础手段 1.1 找更多的牛来拉车吧 当前大多数的互联网系统都使用了服务器集群技术,集群即将相同服务部署在多台服务器上构成一个集群整体对外提供服务,这些集群可以是Web应用服务 ...

  9. Windows平台分布式架构实践 - 负载均衡

    概述 最近.NET的世界开始闹腾了,微软官方终于加入到了对.NET跨平台的支持,并且在不久的将来,我们在VS里面写的代码可能就可以通过Mono直接在Linux和Mac上运行.那么大家(开发者和企业)为 ...

随机推荐

  1. 线程池ThreadPoolExecutor的一种扩展办法

    概述 在JAVA的世界里,如果想并行的执行一些任务,可以使用ThreadPoolExecutor. 大部分情况下直接使用ThreadPoolExecutor就可以满足要求了,但是在某些场景下,比如瞬时 ...

  2. [NOI 2016]优秀的拆分

    Description 题库链接 给你一个长度为 \(n\) 的只含小写字母的字符串 \(S\) ,计算其子串有多少优秀的拆分. 如果一个字符串能被表示成 \(AABB\) 的形式,其中 \(A,B\ ...

  3. 分布式理论(二)——Base 理论

    前言 在前文 分布式理论(一) -- CAP 定理 中,我们说,CAP 不可能同时满足,而分区容错是对于分布式系统而言,是必须的.最后,我们说,如果系统能够同时实现 CAP 是再好不过的了,所以出现了 ...

  4. AssemblyInfo.cs 详解

    前言 ? .net工程(包括Web和WinForm)的Properties文件夹下自动生成一个名为AssemblyInfo.cs的文件,一般情况下我们很少直接改动该文件.但我们实际上通过另一个形式操作 ...

  5. [日常] Go语言圣经--包和文件-导入包习题

    1.每个包都有一个全局唯一的导入路径 2.按照惯例,一个包的名字和包的导入路径的最后一个字段相同 练习 2.2: 写一个通用的单位转换程序,用类似cf程序的方式从命令行读取参数,如果缺省的话则是从标准 ...

  6. python 系列文章汇总(持续更新...）

    引言 不知不觉已经写了好几篇 python 相关的随笔了,从刚开始的门外汉到现在已经对 python 有一些入门了,时间也已经过去了一个多月. 写博客真是好处多多,不仅能提供整理自己学习的知识点,梳理 ...

  7. 【奇技淫巧】绕过waf写文件

    今天偶然利用此命令干成了大事,老司机一看就懂命令用法百度搜到的,希望对各位表哥有用echo 48 65 6C 6C 6F 2C 57 6F 72 6C 64 21 >hex.txt::生成 he ...

  8. 2017萌新的ACM之旅参考代码

    地址:https://vjudge.net/contest/180794#overview A #include <iostream> using namespace std; int m ...

  9. JavaSE——线程通信

    线程通信: 如果线程A和线程B持有同一个MyObject类的对象object,这两个线程会去调用不同的方法,但是它们是同步执行的,比如:线程B需要等待线程A执行完了methodA()方法之后,它才能执 ...

  10. 标准工作流（AWE）邮件通知

    今天遇到一个问题,UAT环境收不到流程待办,最终审批,最终拒绝等邮件. 检查了PT_WF_NOTIFICATION包的Notification类中的Send方法,发现如果app服务器在psappsrv ...