init

.gitignore

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+# ignore files with below extensions
+*.pyc
+*.pyo
+*.log
+*.sqlite3
+
+# ignore below files
+.coverage
+yarn.lock
+package-lock.json
+.env.secrets
+.ash_history
+.bash_history
+
+# ignore below directories
+__pycache__/
+node_modules/
+.cache/
+.pytest_cache/

README.md

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+# Description
+
+Plain flask init project.
+
+# Instructions
+
+```bash
+$ docker-compose up
+```

app/hello.py

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+from flask import Flask
+
+
+app = Flask(__name__)
+
+@app.route('/')
+def hello_world():
+    return 'Hello, World!'

app/requirements.txt

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+Flask

app/scripts/startup.sh

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+#!/bin/ash
+
+echo "Install requirements.txt"
+pip install -r /app/requirements.txt --no-cache-dir
+
+# is $@ empty 
+if [ -z "$@" ]
+then
+    echo "Run App"
+    flask run --host=0.0.0.0 --port=$PORT
+else
+    echo "Executeing \$@ command: $@"
+    exec $@
+fi

docker-compose.yaml

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+version: "3.8"
+services:
+  app:
+    build:
+      context: ./app
+      dockerfile: ../docker/Dockerfile
+    image: flask/demo
+    container_name: flask-demo
+    hostname: flask-dev-demo
+    volumes:
+       - ./app:/app
+    # command: sleep 3600

docker/Dockerfile

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+FROM python:3.7.9-alpine
+
+ARG PORT=8000
+ENV PORT=$PORT
+ARG FLASK_APP=/app/hello.py
+ENV FLASK_APP=$FLASK_APP
+
+ENV HOME=/app
+ENV PYTHONUNBUFFERED=True
+ENV PYTHONIOENCODING=UTF-8
+
+WORKDIR /app
+COPY . /app
+
+# Fixed permissions, create exec:exec and dev:dev
+RUN sed -i '/999/d;' /etc/group
+RUN addgroup -S -g 999 exec && adduser -u 999 -s /sbin/nologin -SDHG exec exec
+RUN adduser -DH dev && adduser exec dev
+RUN chown -R exec:dev \ 
+    /app \ 
+    /usr/local/bin/ \ 
+    /usr/local/lib/python3.7/
+RUN chmod -R a-w /etc
+
+VOLUME /app
+EXPOSE ${PORT}
+
+USER exec:dev
+
+ENTRYPOINT ["/app/scripts/startup.sh"]