title: Docker logs command doesn't show any logs
body: <p>I have a flask app in python which is built into an image , when I try to run it using the command </p>
  
  <p><code>docker logs -f f7e2cd41c0706b7a26d9ff5821aa1d792c685826d1c9707422a2a5dfa2e33796</code></p>
  
  <p>It is not showing any logs , it should at least show that flask app has started right ? Note that I am able to hit the flask API from the host and it is working.There are many print statements in the code for this API to have worked , so <strong>those print statements should have come in the logs</strong>. Am I missing something here ?</p>
  
  <p>Dockerfile is :</p>
  
  <pre><code>FROM python:3.6.8
  
  WORKDIR /app
  COPY . /app
  
  #RUN apt-get update -y
  #RUN apt-get install python-pip -y
  
  RUN pip install -r requirements.txt
  
  EXPOSE 5001
  
  WORKDIR Flask/
  RUN chmod -x main.py ;
  
  CMD ["python", "main.py"]
  </code></pre>