Why Docker
Containerization ensures consistency across environments, simplifies deployment, and enables horizontal scaling. Docker has become the standard for deploying production services.
Containerizing Your Application
Dockerfile
FROM python:3.11-slim
WORKDIR /app
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt
COPY . .
EXPOSE 8000
CMD ["gunicorn", "app:app", "-b", "0.0.0.0:8000"]Build and Run
docker build -t context-manager .
docker run -p 8000:8000 context-managerDocker Compose Setup
Compose orchestrates multi-container deploymentsโyour app, database, cache, and supporting services.
version: '3.8'
services:
app:
build: .
ports: ["8000:8000"]
depends_on: [db, redis]
db:
image: postgres:15
volumes: ["pg_data:/var/lib/postgresql/data"]
redis:
image: redis:7-alpine
volumes:
pg_data:Production Considerations
Use multi-stage builds to reduce image size. Implement health checks. Configure resource limits. Use secrets management for credentials. Set up logging drivers for centralized log collection.
Orchestration
For production, consider Kubernetes or managed container services. They provide auto-scaling, rolling deployments, and self-healing capabilities essential for production workloads.