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第七次实验

作者:互联网

实验7:基于REST API的SDN北向应用实践

一、实验目的

  1. 能够编写程序调用OpenDaylight REST API实现特定网络功能;
  2. 能够编写程序调用Ryu REST API实现特定网络功能。

二、实验环境

  1. 下载虚拟机软件Oracle VisualBox或VMware;
  2. 在虚拟机中安装Ubuntu 20.04 Desktop amd64,并完整安装Mininet、OpenDaylight(Carbon版本)、Postman和Ryu;

三、实验要求

(一)基本要求

  1. OpenDaylight

    (1) 利用Mininet平台搭建下图所示网络拓扑,并连接OpenDaylight;

    img

(2) 编写Python程序,调用OpenDaylight的北向接口下发指令删除s1上的流表数据。

#!/usr/bin/python
import requests
from requests.auth import HTTPBasicAuth
def http_delete(url):
    url= url
    headers = {'Content-Type':'application/json'}
    resp = requests.delete(url,headers=headers,auth=HTTPBasicAuth('admin', 'admin'))
    return resp

if __name__ == "__main__":
    url='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/'
    resp = http_delete(url)
    print (resp.content)

(3) 编写Python程序,调用OpenDaylight的北向接口下发硬超时流表,实现拓扑内主机h1和h3网络中断20s。

#!/usr/bin/python
import requests
from requests.auth import HTTPBasicAuth
def http_put(url,jstr):
    url= url
    headers = {'Content-Type':'application/json'}
    resp = requests.put(url,jstr,headers=headers,auth=HTTPBasicAuth('admin', 'admin'))
    return resp

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('h_timeout.json') as f:
        jstr = f.read()
    resp = http_put(url,jstr)
    print (resp.content)
{
    "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"
        }
    ]
}

(4) 编写Python程序,调用OpenDaylight的北向接口获取s1上活动的流表数。

  #!/usr/bin/python
  import requests
  import json
  from requests.auth import HTTPBasicAuth
  def http_get(url):
      url= url
      headers = {'Content-Type':'application/json'}
      resp = requests.get(url,headers=headers,auth=HTTPBasicAuth('admin','admin'))
      return resp
  
  if __name__ == "__main__":
      url='http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0'
      resp = http_get(url)
      res = json.loads(resp.text)
      # print(resp.text)
      print(len(res['flow-node-inventory:table'][0]['flow']))

  1. Ryu
    (1) 编写Python程序,调用Ryu的北向接口,实现上述OpenDaylight实验拓扑上相同的硬超时流表下发。

    #!/usr/bin/python
    import requests
    from requests.auth import HTTPBasicAuth
    def http_post(url,jstr):
        url= url
        headers = {'Content-Type':'application/json'}
        resp = requests.post(url,jstr,headers=headers)
        return resp
    
    if __name__ == "__main__":
        url='http://127.0.0.1:8080/stats/flowentry/add'
        with open('ryu_htimeout.json') as f:
            jstr = f.read()
        resp = http_post(url,jstr)
        print (resp.content)
    {
        "dpid": 1,
        "cookie": 1,
        "cookie_mask": 1,
        "table_id": 0,
        "hard_timeout": 20,
        "priority": 65535,
        "flags": 1,
        "match":{
            "in_port":1
        },
        "actions":[
            {
                "type":"OUTPUT",
                "port": 2
            }
        ]
     }
  2. (2) 利用Mininet平台搭建下图所示网络拓扑,要求支持OpenFlow 1.3协议,主机名、交换机名以及端口对应正确。拓扑生成后需连接Ryu,且Ryu应能够提供REST API服务。
    img

    (3) 整理一个Shell脚本,参考Ryu REST API的文档,利用curl命令,实现和实验2相同的VLAN。

    VLAN_IDHosts
    0 h1 h3
    1 h2 h4
  3. 心得体会
  4. 好多都是不会做,上节课因为有事请假也是没有去上课,做实验的时候也是一脸懵,感觉好难的样子,后面也是没有做出来,提取了大部分同学的代码,也请教了许多人。

标签:__,http,url,resp,headers,实验,第七次,requests
来源: https://www.cnblogs.com/lh-1226/p/15465192.html