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python - 如何从 docker 容器内部发送 post 请求？

问题描述

我正在尝试从服务器的 docker 容器内部发送发布请求。容器运行良好，直到它尝试发出发布请求，此时它只是挂起。

服务器具有已通过 ping 命令测试的 Internet 连接。

这是它挂起的代码

while not send_flag:
        print('Attempting to send post')
        r = requests.post(
            'https://notarealaddress.fake', 
            headers = header,
            data = json.dumps(payload))
        if r.json()["status"] == 'success':
            print('Successfully Pushed')
            send_flag = True
        else:
            print('Failed to send alert with response:\n {}'.format(r.json()))
            sleep(60)

在“尝试发送帖子”之后，我看不到任何后面的打印语句，强制退出程序时收到的错误是：

  File "./main.py", line 16, in <module>
    send_incident(payload)
File "/usr/src/app/pagerduty_functions.py", line 50, in send_incident
data = json.dumps(payload))
File "/usr/local/lib/python3.6/site-packages/requests/api.py", line 116, in post
return request('post', url, data=data, json=json, **kwargs)
File "/usr/local/lib/python3.6/site-packages/requests/api.py", line 60, in request
return session.request(method=method, url=url, **kwargs)
File "/usr/local/lib/python3.6/site-packages/requests/sessions.py", line 533, in request
resp = self.send(prep, **send_kwargs)
File "/usr/local/lib/python3.6/site-packages/requests/sessions.py", line 646, in send
r = adapter.send(request, **kwargs)
File "/usr/local/lib/python3.6/site-packages/requests/adapters.py", line 449, in send
timeout=timeout
File "/usr/local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 600, in urlopen
chunked=chunked)
File "/usr/local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 343, in _make_request
self._validate_conn(conn)
File "/usr/local/lib/python3.6/site-packages/urllib3/connectionpool.py", line 839, in _validate_conn
conn.connect()
File "/usr/local/lib/python3.6/site-packages/urllib3/connection.py", line 301, in connect
conn = self._new_conn()
File "/usr/local/lib/python3.6/site-packages/urllib3/connection.py", line 159, in _new_conn
(self._dns_host, self.port), self.timeout, **extra_kw)
File "/usr/local/lib/python3.6/site-packages/urllib3/util/connection.py", line 70, in create_connection
sock.connect(sa)

当从我的本地机器运行时，Docker 映像运行成功，所以我发现很难识别问题。

标签： pythondocker

解决方案

无论您运行什么镜像，您都需要先通过以下方法检查容器的 ip 和域名连接。

您可以在下面替换您的域名。

sudo docker run -it python ping www.google.com
PING www.google.com (172.217.160.68) 56(84) bytes of data.
64 bytes from tsa01s09-in-f4.1e100.net (172.217.160.68): icmp_seq=1 ttl=54 time=2.53 ms
64 bytes from tsa01s09-in-f4.1e100.net (172.217.160.68): icmp_seq=2 ttl=54 time=2.59 ms
64 bytes from tsa01s09-in-f4.1e100.net (172.217.160.68): icmp_seq=3 ttl=54 time=2.65 ms
64 bytes from tsa01s09-in-f4.1e100.net (172.217.160.68): icmp_seq=4 ttl=54 time=2.59 ms

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