Hello World - A Containerized Flask Web Application

cloudbuild.yaml

steps:
    # builds & pushes the container image to GCR
  - name: 'gcr.io/kaniko-project/executor:latest'
    args:
      - --destination=gcr.io/$PROJECT_ID/webapp:latest
    # deploy image to cloud run
  - name: "gcr.io/cloud-builders/gcloud"
    args: ['beta', 'run', 'deploy', 'webapp', '--image', 'gcr.io/$PROJECT_ID/webapp:latest', '--region', 'us-central1', '--platform', 'managed', '--allow-unauthenticated']

Dockerfile

FROM python:3.7-stretch
RUN apt-get update -y
RUN apt-get install -y python-pip python-dev build-essential
COPY . /app
WORKDIR /app
RUN pip install -r requirements.txt
ENTRYPOINT ["python"]
CMD ["main.py"]

index.html

<h1> Hello World from Flask Web App </h1>

main.py

import os
from flask import Flask, request

app = Flask(__name__, static_url_path='', static_folder='')

@app.route('/')
def root():
    return app.send_static_file('index.html')

PORT = int(os.environ.get("PORT", 8080))
if __name__ == '__main__':
    app.run(threaded=True,host='0.0.0.0',port=PORT)

requirements.txt

flask