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实验7:基于REST API的SDN北向应用实践

时间:2022-11-04 20:11:28浏览次数:53  
标签:__ url REST headers json API SDN type requests

  • 编写Python程序,调用OpenDaylight的北向接口实现以下功能
    • 利用Mininet平台搭建下图所示网络拓扑,并连接OpenDaylight;
      sudo mn --topo=single,3 --controller=remote,ip=127.0.0.1,port=6633 --switch ovsk,protocols=OpenFlow13

      ./distribution-karaf-0.4.4-Beryllium-SR4/bin/karaf

    • 下发指令删除s1上的流表数据。

      #!/usr/bin/python
      import requests
      from requests.auth import HTTPBasicAuth
      
      if __name__ == "__main__":
         url = 'http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/'
         headers = {'Content-Type': 'application/json'}
         res = requests.delete(url, headers=headers, auth=HTTPBasicAuth('admin', 'admin'))
         print (res.content)
      
      

    • 下发硬超时流表,实现拓扑内主机h1和h3网络中断20s。

      import requests
      from requests.auth import HTTPBasicAuth
      if __name__ == "__main__":
          url = 'http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/1'
          with open("./timeout.json") as file:
              str = file.read()
          headers = {'Content-Type': 'application/json'}
          res = requests.put(url, str, headers=headers, auth=HTTPBasicAuth('admin', 'admin'))
          print (res.content)
      
      
      #以JSON格式填入流表内容 flow.json内容如下
      {
        "flow": [
          {
            "id": "1",
        "match": {
          "in-port": "1",
          "ethernet-match": {
            "ethernet-type": {
              "type": "0x0800"
            }
          },
          "ipv4-destination": "10.0.0.3/32"
        },
        "instructions": {
          "instruction": [
            {
              "order": "0",
              "apply-actions": {
                "action": [
                  {
                    "order": "0",
                    "drop-action": {}
                  }
                ]
              }
            }
          ]
        },
        "flow-name": "flow1",
        "priority": "65535",
        "hard-timeout": "20",
        "cookie": "2",
        "table_id": "0"
          }
        ]
      }
      


    • 获取s1上活动的流表数。

import requests
from requests.auth import HTTPBasicAuth

if __name__ == '__main__':
    url = 'http://127.0.0.1:8181/restconf/operational/opendaylight-inventory:nodes/node/openflow:1/' \
          'flow-node-inventory:table/0/opendaylight-flow-table-statistics:flow-table-statistics'
    headers = {'Content-Type': 'application/json'}
    response = requests.get(url=url, headers=headers, auth=HTTPBasicAuth('admin', 'admin'))
    print(response.content)

  • 编写Python程序,调用Ryu的北向接口实现以下功能
    • 实现上述OpenDaylight实验拓扑上相同的硬超时流表下发。
import requests
from requests.auth import HTTPBasicAuth

if __name__ == '__main__':
    url = 'http://127.0.0.1:8080/stats/flowentry/add'
    headers = {'Content-Type': 'application/json'}
    json = open('ryu_timeout.json').read()
    response = requests.post(url, data=json, headers=headers)
    print(response.content)

{
    "dpid": 1,
    "cookie": 1,
    "cookie_mask": 1,
    "table_id": 0,
    "hard_timeout": 20,
    "priority": 65535,
    "flags": 1,
    "match":{
        "in_port":1
    },
    "actions":[]
 }



  • 参考Ryu REST API的文档,基于VLAN实验的网络拓扑,编程实现相同的VLAN配置。
from mininet.topo import Topo

class MyTopo(Topo):
    def __init__(self):

        Topo.__init__(self)

        self.addSwitch("s1")
        self.addSwitch("s2")

        self.addHost("h1")
        self.addHost("h2")
        self.addHost("h3")
        self.addHost("h4")

        self.addLink("s1", "h1")
        self.addLink("s1", "h2")
        self.addLink("s2", "h3")
        self.addLink("s2", "h4")
        self.addLink("s1", "s2")

topos = {'mytopo': (lambda: MyTopo())}
#!/usr/bin/python
import json

import requests

if __name__ == "__main__":
    url = 'http://127.0.0.1:8080/stats/flowentry/add'
    headers = {'Content-Type': 'application/json'}
    flow1 = {
        "dpid": 1,
        "priority": 1,
        "match":{
            "in_port": 1
        },
        "actions":[
            {
                "type": "PUSH_VLAN",    
                "ethertype": 33024      
            },
            {
                "type": "SET_FIELD",
                "field": "vlan_vid",    
                "value": 4096           
            },
            {
                "type": "OUTPUT",
                "port": 3
            }
        ]
    }
    flow2 = {
        "dpid": 1,
        "priority": 1,
        "match":{
            "in_port": 2
        },
        "actions":[
            {
                "type": "PUSH_VLAN",     
                "ethertype": 33024      
            },
            {
                "type": "SET_FIELD",
                "field": "vlan_vid",     
                "value": 4097           
            },
            {
                "type": "OUTPUT",
                "port": 3
            }
        ]
    }
    flow3 = {
        "dpid": 1,
        "priority": 1,
        "match":{
            "vlan_vid": 0
        },
        "actions":[
            {
                "type": "POP_VLAN",    
                "ethertype": 33024     
            },
            {
                "type": "OUTPUT",
                "port": 1
            }
        ]
    }
    flow4 = {
        "dpid": 1,
        "priority": 1,
        "match": {
            "vlan_vid": 1
        },
        "actions": [
            {
                "type": "POP_VLAN", 
                "ethertype": 33024  
            },
            {
                "type": "OUTPUT",
                "port": 2
            }
        ]
    }
    flow5 = {
        "dpid": 2,
        "priority": 1,
        "match": {
            "in_port": 1
        },
        "actions": [
            {
                "type": "PUSH_VLAN", 
                "ethertype": 33024 
            },
            {
                "type": "SET_FIELD",
                "field": "vlan_vid", 
                "value": 4096  
            },
            {
                "type": "OUTPUT",
                "port": 3
            }
        ]
    }
    flow6 = {
        "dpid": 2,
        "priority": 1,
        "match": {
            "in_port": 2
        },
        "actions": [
            {
                "type": "PUSH_VLAN",  
                "ethertype": 33024  
            },
            {
                "type": "SET_FIELD",
                "field": "vlan_vid",  
                "value": 4097 
            },
            {
                "type": "OUTPUT",
                "port": 3
            }
        ]
    }
    flow7 = {
        "dpid": 2,
        "priority": 1,
        "match": {
            "vlan_vid": 0
        },
        "actions": [
            {
                "type": "POP_VLAN", 
                "ethertype": 33024  
            },
            {
                "type": "OUTPUT",
                "port": 1
            }
        ]
    }
    flow8 = {
        "dpid": 2,
        "priority": 1,
        "match": {
            "vlan_vid": 1
        },
        "actions": [
            {
                "type": "POP_VLAN", 
                "ethertype": 33024  
            },
            {
                "type": "OUTPUT",
                "port": 2
            }
        ]
    }
    res1 = requests.post(url, json.dumps(flow1), headers=headers)
    res2 = requests.post(url, json.dumps(flow2), headers=headers)
    res3 = requests.post(url, json.dumps(flow3), headers=headers)
    res4 = requests.post(url, json.dumps(flow4), headers=headers)
    res5 = requests.post(url, json.dumps(flow5), headers=headers)
    res6 = requests.post(url, json.dumps(flow6), headers=headers)
    res7 = requests.post(url, json.dumps(flow7), headers=headers)
    res8 = requests.post(url, json.dumps(flow8), headers=headers)



  • 个人总结
    感觉这次的实验比较难,并且感觉题量有点多,综合了前几次学习的知识点,之前的python代码的掌握没有很好,所以这次的实验让我更加意识到了这个问题,还有很多地方需要改进,做实验的时候也看了之前的ppt,并且参考了一些同学们的实验报告。
    调用ryu北向接口实现编程的第二个实验中也是参考了同学的实验报告,有一些需要注意的:
    先打开ryu ryu-manager ryu.app.simple_switch_13 ryu.app.ofctl_rest
    然后再创建拓扑sudo mn --custom topo.py --topo mytopo --mac --controller=remote,ip=127.0.0.1,port=6633 --switch ovsk,protocols=OpenFlow13
    之后需要安装插件sudo apt install curl
    然后删除流表:
    curl -X DELETE http://127.0.0.1:8080/stats/flowentry/clear/1
    curl -X DELETE http://127.0.0.1:8080/stats/flowentry/clear/2
    删完流表之后开始执行代码就可以了

标签:__,url,REST,headers,json,API,SDN,type,requests
From: https://www.cnblogs.com/mademoiselle/p/16858974.html

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