實驗7：基於REST API的SDN北向應用實踐

(一)基本要求

(1)編寫Python程序，調用OpenDaylight的北向接口下發指令刪除s1上的流表數據。

def http_detele(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_detele(url)
    print(resp.content)

(2) 編寫Python程序，調用OpenDaylight的北向接口下發硬超時流表，實現拓撲內主機h1和h3網絡中斷20s。

（這里的json文件就是第4次實驗的json文件，這里不貼出來了）

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('test.json') as f:
        jstr = f.read()
    resp = http_put(url)
    print(resp.content)

（4）編寫Python程序，調用OpenDaylight的北向接口獲取s1上活動的流表數。

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/operational/opendaylight-inventory:nodes/node/openflow:1/flow-node-inventory:table/0/opendaylight-flow-table-statistics:flow-table-statistics'
    with open('test.json') as f:
        jstr = f.read()
    resp = http_get(url)
    print(resp.content)

2.ryu

（1）編寫Python程序，調用Ryu的北向接口，實現上述OpenDaylight實驗拓撲上相同的硬超時流表下發。

def http_post(url, js):
    headers = {'Content-Type': 'application/json'}
    resp = requests.post(url, jstr, headers=headers)
    print(resp)


if __name__ == '__main__':
    url = 'http://localhost:8080/stats/flowentry/add'
    with open('test.json') as f:
        jstr = f.read()
    http_post(url, jstr)

{
  "dpid": 1,
  "match": {
    "in-port": "1",
    "dl_dst": "00:00:00:00:00:03"
  },
  "priority": 65535,
  "hard_timeout": 20,
  "cookie": "2",
  "table_id": 0,
  "actions": []
}

（2） 利用Mininet平台搭建下圖所示網絡拓撲，要求支持OpenFlow 1.3協議，主機名、交換機名以及端口對應正確。拓撲生成后需連接Ryu，且Ryu應能夠提供REST API服務。

（3） 整理一個Shell腳本，參考Ryu REST API的文檔，利用curl命令，實現和實驗2相同的VLAN。

curl -X POST -d '{
  "dpid": 1,
  "match": {
    "in_port": 1
  },
  "actions": [
    {
      "type": "PUSH_VLAN",
      "ethertype": 33024
    },
    {
      "type": "SET_FIELD",
      "field": "vlan_vid",
      "value": 4096
    },
    {
      "type":"OUTPUT",
      "port": 3
    }
    ],
    "priority":5
}' http://localhost:8080/stats/flowentry/add

curl -X POST -d '
{
  "dpid": 1,
  "priority":5,
  "match": {
    "in_port": 2
  },
  "actions": [
    {
      "type": "PUSH_VLAN",
      "ethertype": 33024
    },
    {
      "type": "SET_FIELD",
      "field": "vlan_vid",
      "value": 4097
    },
    {
      "type":"OUTPUT",
      "port": 3
    }
    ]
}' http://localhost:8080/stats/flowentry/add

curl -X POST -d '
{
  "dpid": 1,
  "match": {
    "vlan_vid": 0
  },
  "actions": [
    {
      "type": "POP_VLAN",
      "ethertype": 33024
    },
    {
      "type":"OUTPUT",
      "port": 1
    }
    ],
    "priority":5
}
' http://localhost:8080/stats/flowentry/add

curl -X POST -d'
{
  "dpid": 1,
  "match": {
    "vlan_vid": 1
  },
  "actions": [
    {
      "type": "POP_VLAN",
      "ethertype": 33024
    },
    {
      "type":"OUTPUT",
      "port": 2
    }
    ],
    "priority":5
}
' http://localhost:8080/stats/flowentry/add
curl -X POST -d '{
  "dpid": 2,
  "match": {
    "in_port": 1
  },
  "actions": [
    {
      "type": "PUSH_VLAN",
      "ethertype": 33024
    },
    {
      "type": "SET_FIELD",
      "field": "vlan_vid",
      "value": 4096
    },
    {
      "type":"OUTPUT",
      "port": 3
    }
    ],
    "priority":5
}' http://localhost:8080/stats/flowentry/add

curl -X POST -d '
{
  "dpid": 2,
  "match": {
    "in_port": 2
  },
  "actions": [
    {
      "type": "PUSH_VLAN",
      "ethertype": 33024
    },
    {
      "type": "SET_FIELD",
      "field": "vlan_vid",
      "value": 4097
    },
    {
      "type":"OUTPUT",
      "port": 3
    }
    ],
    "priority":5
}' http://localhost:8080/stats/flowentry/add

curl -X POST -d '
{
  "dpid": 2,
  "match": {
    "vlan_vid": 0
  },
  "actions": [
    {
      "type": "POP_VLAN",
      "ethertype": 33024
    },
    {
      "type":"OUTPUT",
      "port": 1
    }
    ],
    "priority":5
}
' http://localhost:8080/stats/flowentry/add

curl -X POST -d'
{
  "dpid": 2,
  "match": {
    "vlan_vid": 1
  },
  "actions": [
    {
      "type": "POP_VLAN",
      "ethertype": 33024
    },
    {
      "type":"OUTPUT",
      "port": 2
    }
    ],
    "priority":5
}' http://localhost:8080/stats/flowentry/add

（二）進階

編程實現基本要求第2部分Ryu（3）中的VLAN划分。

import requests

def http_post(url, js):
    headers = {'Content-Type': 'application/json'}
    resp = requests.post(url, jstr, headers=headers)
    print(resp.content)


if __name__ == '__main__':
    url = 'http://localhost:8080/stats/flowentry/add'
    for i in range(1, 9):
        with open('%s.json' % i) as f:
            jstr = f.read()
        http_post(url, jstr)

(將流表項分開為8個json文件並且逐個讀取添加)

（三）心得

1.ODL的隨便做做就行，並不難
2.Ryu的REST API老師沒有給示例，摸清流表的格式花了好多時間
3.這是我最花時間的一次實驗，都在查資料和試錯
4.VLAN划分時記得設置優先度
5.
相關網頁開了111個，狂查資料
6.受益匪淺
7.不要白嫖給個推薦吧
8.miniedit連接ryu時要設置這個
9.gui_topology.py內自帶REST API相關組件
10.可以多去老師博客看看