Deploying a minimal flask app in docker - server connection issues

Question

I have an app who\'s only dependency is flask, which runs fine outside docker and binds to the default port 5000. Here is the full source:

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Answer 1

First of all in your python script you need to change code from

app.run()

to

app.run(host="0.0.0.0")

Second, In your docker file, last line should be like

CMD ["flask", "run", "-h", "0.0.0.0", "-p", "5000"]

And on host machine if 0.0.0.0:5000 doesn't work then you should try with localhost:5000

Note - The CMD command has to be proper. Because CMD command provide defaults for executing container.