如何从主机查询 docker 容器？

Question

我运行在我机器上的 docker 容器中安装服务器。我想从我的机器（主机）发送 HTTP 请求到容器内的服务器。当我在容器内发送带有 HTTP 的 GET 请求时，它会检测到服务器。但是，如果我向容器的 IP 地址发送相同的请求（这次是从容器外部的主机），它会告诉我：

Traceback (most recent call last):
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/site-packages/requests/adapters.py", line 449, in send
    timeout=timeout
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/site-packages/urllib3/connectionpool.py", line 727, in urlopen
    method, url, error=e, _pool=self, _stacktrace=sys.exc_info()[2]
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/site-packages/urllib3/util/retry.py", line 410, in increment
    raise six.reraise(type(error), error, _stacktrace)
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/site-packages/urllib3/packages/six.py", line 734, in reraise
    raise value.with_traceback(tb)
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/site-packages/urllib3/connectionpool.py", line 677, in urlopen
    chunked=chunked,
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/site-packages/urllib3/connectionpool.py", line 426, in _make_request
    six.raise_from(e, None)
  File "<string>", line 3, in raise_from
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/site-packages/urllib3/connectionpool.py", line 421, in _make_request
    httplib_response = conn.getresponse()
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/http/client.py", line 1344, in getresponse
    response.begin()
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/http/client.py", line 306, in begin
    version, status, reason = self._read_status()
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/http/client.py", line 267, in _read_status
    line = str(self.fp.readline(_MAXLINE + 1), "iso-8859-1")
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/socket.py", line 589, in readinto
    return self._sock.recv_into(b)
urllib3.exceptions.ProtocolError: ('Connection aborted.', ConnectionResetError(104, 'Connection reset by peer'))

或者这个：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/site-packages/requests/api.py", line 76, in get
    return request('get', url, params=params, **kwargs)
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/site-packages/requests/api.py", line 61, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/site-packages/requests/sessions.py", line 530, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/site-packages/requests/sessions.py", line 643, in send
    r = adapter.send(request, **kwargs)
  File "/home/user/miniconda3/envs/dl_project/lib/python3.7/site-packages/requests/adapters.py", line 516, in send
    raise ConnectionError(e, request=request)
requests.exceptions.ConnectionError: HTTPConnectionPool(host='172.17.0.2', port=8000): Max retries exceeded with url: /hello (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f5312c54690>: Failed to establish a new connection: [Errno 111] Connection refused'))

这是我启动容器时使用的命令：

docker run -it --publish 8000:8000 my_server:v1

和 Python 脚本我运行用于发送请求：

import requests
print(requests.get("http://172.17.0.2:8000/hello").text

这是我用来查找容器 IP 地址的命令：

$ docker inspect d6c7d98b9fdd | grep IP
            "LinkLocalIPv6Address": "",
            "LinkLocalIPv6PrefixLen": 0,
            "SecondaryIPAddresses": null,
            "SecondaryIPv6Addresses": null,
            "GlobalIPv6Address": "",
            "GlobalIPv6PrefixLen": 0,
            "IPAddress": "172.17.0.2",
            "IPPrefixLen": 16,
            "IPv6Gateway": "",
                    "IPAMConfig": null,
                    "IPAddress": "172.17.0.2",
                    "IPPrefixLen": 16,
                    "IPv6Gateway": "",
                    "GlobalIPv6Address": "",
                    "GlobalIPv6PrefixLen": 0,

我知道 question, but I am not using docker files to create the image (I pulled it from docker hub) so the answer does not help me. I also found 但它对我没有帮助。

预先感谢您的帮助。

Answer 1

--publish 8000:8000 制定端口转发规则，将在主机端口 8000（左值）上接收到的数据包定向到容器的端口 8000（右值）。那就是你可以用 <hostIpOrName>:8000 到达你的容器。在主机上，您可以使用 localhost:8000.

您最好不要在代码中使用容器 IP，因为它会经常更改。

还应注意，为了使其正常工作，您的后端应该监听环回 IP 地址（127.0.0.1 或类似地址）以外的内容。使用 0.0.0.0 允许应用程序接受来自任何 IP 的连接。对于 ray 这可以通过 serve.start(http_host="0.0.0.0") 来实现。

如何从主机查询 docker 容器？

How to query docker container from host?

python

network-programming

ray

docker