实验7：基于REST API的SDN北向应用实践

实验7：基于REST API的SDN北向应用实践
一、实验目的
能够编写程序调用OpenDaylight REST API实现特定网络功能；
能够编写程序调用Ryu REST API实现特定网络功能。
二、实验环境
下载虚拟机软件Oracle VisualBox或VMware；
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
编写Python程序，调用OpenDaylight的北向接口实现以下功能
（1）利用Mininet平台搭建下图所示网络拓扑，并连接OpenDaylight；

生成拓扑并连接控制器:sudo mn --topo=single,3 --controller=remote,ip=127.0.0.1,port=6633 --switch ovsk,protocols=OpenFlow13

运行 karaf 启动 ODL: ./distribution-karaf-0.6.4-Carbon/bin/karaf

浏览器访问：http://127.0.0.1:8181/index.html 访问查看。

（2）下发指令删除s1上的流表数据。

 delete.py代码

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

1 #!/usr/bin/python
 2 import requests
 3 from requests.auth import HTTPBasicAuth
 4 if __name__ == "__main__":
 5     url = 'http://127.0.0.1:8181/restconf/config/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/flow/1'
 6     with open("./timeout.json") as file:
 7         str = file.read()
 8     headers = {'Content-Type': 'application/json'}
 9     res = requests.put(url, str, headers=headers, auth=HTTPBasicAuth('admin', 'admin'))
10     print (res.content)

# timeout.json
 2 {
 3     "flow": [
 4       {
 5         "id": "1",
 6         "match": {
 7           "in-port": "1",
 8           "ethernet-match": {
 9             "ethernet-type": {
10               "type": "0x0800"
11             }
12           },
13           "ipv4-destination": "10.0.0.3/32"
14         },
15         "instructions": {
16           "instruction": [
17             {
18               "order": "0",
19               "apply-actions": {
20                 "action": [
21                   {
22                     "order": "0",
23                     "drop-action": {}
24                   }
25                 ]
26               }
27             }
28           ]
29         },
30         "flow-name": "flow",
31         "priority": "65535",
32         "hard-timeout": "20",
33         "cookie": "2",
34         "table_id": "0"
35       }
36     ]
37   }

（4） 获取s1上活动的流表数。


 get.py代码


1 #!/usr/bin/python
2 import requests
3 from requests.auth import HTTPBasicAuth
4 if __name__ == "__main__":
5     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'
6     headers = {'Content-Type': 'application/json'}
7     res = requests.get(url,headers=headers, auth=HTTPBasicAuth('admin', 'admin'))
8     print (res.content)

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

①生成拓扑并连接控制器: sudo mn --topo=single,3 --controller=remote,ip=127.0.0.1,port=6633 --
switch ovsk,protocols=OpenFlow13
②运行ryu:ryu-manager ryu/ryu/app/ofctl_rest.py ryu/ryu/app/simple_switch_13.py

1 #!/usr/bin/python
2 import requests
3 if __name__ == "__main__":
4     url = 'http://127.0.0.1:8080/stats/flowentry/add'
5     with open("./ryu_timeout.json") as file:
6         str = file.read()
7     headers = {'Content-Type': 'application/json'}
8     res = requests.post(url, str, headers=headers)
9     print (res.content)

# ryu_timeout.json
 2 {
 3     "dpid": 1,
 4     "cookie": 1,
 5     "cookie_mask": 1,
 6     "table_id": 0,
 7     "hard_timeout": 20,
 8     "priority": 65535,
 9     "flags": 1,
10     "match":{
11         "in_port":1
12     },
13     "actions":[]
14  }