Docker 容器无法访问本地网络设备

Question

I'm running a Home Assistant instance in a Docker container with an integration I'm working on connecting to a local device.

My Python looks like this, which I've tested directly on my Windows machine, it runs and connects just fine

        if self.session is None:
            self.session = aiohttp.ClientSession()
            self._close_session = True

        try:
            async with async_timeout.timeout(self.request_timeout):
                response = await self.session.request(method, url, json=data)
                LOGGER.info(response)

When running this in the container however, it fails to connect. The IP of my Windows machine is 192.168.1.174 , the IP of the device I'm trying to connect to is 192.168.1.190 . I've also tried connecting the container to a Docker network with a 192.168.1.0/24 subnet, which gave my container the IP of 192.168.1.2 , but it's still unable to reach the device.

I'm at a loss now as to what the issue could be. Any suggestions please?

Answer 1

If you are inside a container and trying to access a local device using the URL, the base image used by the container must be able to resolve hostnames to IPs or else it will not be able to connect since there is no resolution to an IP for the local device

Make sure to go inside the container and run

host google.com 

this should resolve into an IP or else you will to add that capability