Deploy Flask application From Dockerfile on OpenShift

Step 1. Create Dockerfile on https://github.com/IBM/deploy-python-openshift-tutorial.git

from alpine:latest
RUN apk add --no-cache py3-pip \
    && pip3 install --upgrade pip
WORKDIR /app
COPY . /app
RUN pip3 --no-cache-dir install -r requirements.txt
EXPOSE 5000
ENTRYPOINT ["python3"]
CMD ["helloworld.py"]

Step 2. create helloworld.py in same repository

from flask import Flask  # From module flask import class Flask
app = Flask(__name__)    # Construct an instance of Flask class for our webapp

@app.route('/')   # URL '/' to be handled by main() route handler
def main():
    """Say hello"""
    return 'Hello, world!'

if __name__ == '__main__':  # Script executed directly?
    print("Hello World! Built with a Docker file.")
    app.run(host="0.0.0.0", port=5000, debug=True,use_reloader=True)

Step 3. Create a demo project on OpenShift console and create an application with “From Dockerfile”

Step 4. input git url https://github.com/IBM/deploy-python-openshift-tutorial.git and port number 5000

Step 5. You will find new application once build completed

Step 6. open the url to verify the Flask web application