Deploying Docker Container Registry on Azure App Service Issue - azure

Question

I am unable to rum Docker Container Registry on the Azure App service. I have a flask app and the following is the Dockerfile of it:-
FROM python:3.8-slim-buster
WORKDIR /usr/src/app
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt
# copy project
WORKDIR /usr/src/app
COPY . /usr/src/app/
# expose port 80
EXPOSE 80
CMD ["gunicorn", "-w", "4", "-b", "0.0.0.0:80", "app:app"]
I have deployed the docker image on the Container Registry. I have also set WEBSITES_PORT to 80 under App Service -> Application Settings.
Even after doing that, I get the following error:-
ERROR - Container XYZ didn't respond to HTTP pings on port: 80, failing site start.
I have tried running it locally and it works fine. But, it just does not seem to work on the Azure App service. Any help is highly appreciated.

Answer 1

I don't see an issue in the code you posted but to verify, here is a configuration for a Flask app with a Gunicorn server that works on a containerized Azure App Service:
app.py
from flask import Flask
app = Flask(__name__)
#app.route("/")
def hello_world():
return "<p>Hello World!</p>"
Dockerfile
FROM python:3.8-slim-buster
ADD app.py app.py
ADD requirements.txt requirements.txt
RUN pip install --upgrade pip
RUN python3 -m pip install -r requirements.txt
EXPOSE 80
CMD ["gunicorn", "--bind=0.0.0.0:80", "app:app"]
requirements.txt
flask
gunicorn
I assume you selected "Docker Container" when you created the Azure App Service?
And then simply chose your image?