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

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