Listing 1: Beispiel eines Dockerfiles

FROM debian:12-slim
RUN apt-get update
&& apt-get install -y --no-install-recommends
python3 python3-pip curl
&& rm -rf /var/lib/apt/lists/*
WORKDIR /app
COPY requirements.txt .
RUN pip3 install -r requirements.txt
COPY . .
HEALTHCHECK --interval=30s --timeout=5s
CMD curl -f http://localhost:8080/health ||
exit 1
CMD ["python3", "app.py"]


Listing 2: Anwendung mit Docker Compose

version: "3.8"
services:
app:
image: legacy-app:1.0
ports:
- "8080:8080"
environment:
DB_HOST: db
db:
image: postgres:15
volumes:
- db-data:/var/lib/postgresql/data
volumes:
db-data: