Unable to Connect to Flask App On Docker on windows

Question

I have a flask app (Dash plotly) and I want to run it on Docker. I did the following things on Linux and it ran successfully:

• The code for running the flask app: app.run_server(debug=True, host='0.0.0.0')
• expose the port in the Dockerfile: EXPOSE 8050
• The code for running the app inside the Dockerfile: CMD ["python", "./app.py"]
• From the terminal I ran: sudo docker build -t app.
• From the terminal I ran: sudo docker run -p 8050:8050 --mount type=bind,source=/,target=/tmp app

It provided me the url: 0.0.0.0.8050, and it's works fine.

However, when I downloaded Docker Toolbox on windows 10 and Did exactly the same steps it didn't launch the app on the url that was provided.

Anyone know what's the problem?

Answer 1

It's because docker isn't running natively on Windows. It's running on a virtual Linux machine on Windows. So, instead of using the 0.0.0.0 , you have to check the IP of the toolbox by using:

docker-machine ls

And then replace 0.0.0.0 with the that ip

Update:

If you want to use the host network, you can use the host mode by --network host. But please note that port forward will not work.

reference:

https://docs.docker.com/network/network-tutorial-host/