Docker Deployment

Name: docker-deployment
Rating: 76
Author: Luminous-Banking

Assist with Docker containerization, image building, and deployment workflows.

Quick Start

When helping with Docker tasks:

•Identify the task type (build, run, compose, debug)
•Review existing Docker configuration
•Implement changes following best practices
•Test the configuration

Dockerfile Best Practices

Multi-Stage Builds

Use multi-stage builds to minimize image size:

dockerfile

# Build stage
FROM python:3.11-slim as builder
WORKDIR /app
COPY requirements.txt .
RUN pip install --user -r requirements.txt

# Production stage
FROM python:3.11-slim
WORKDIR /app
COPY --from=builder /root/.local /root/.local
COPY . .
ENV PATH=/root/.local/bin:$PATH
CMD ["python", "main.py"]

Layer Optimization

•Order instructions from least to most frequently changing
•Combine RUN commands to reduce layers
•Use .dockerignore to exclude unnecessary files

Security

•Use specific image tags (not latest)
•Run as non-root user when possible
•Scan images for vulnerabilities
•Don't include secrets in images

Docker Compose Patterns

Development Setup

yaml

services:
  app:
    build: .
    volumes:
      - .:/app  # Mount for hot reload
    environment:
      - DEBUG=true
    ports:
      - "8000:8000"

Production Setup

yaml

services:
  app:
    image: myapp:${VERSION:-latest}
    restart: unless-stopped
    environment:
      - DEBUG=false
    deploy:
      resources:
        limits:
          memory: 512M

Common Tasks

Build and Run

bash

# Build image
docker build -t myapp:latest .

# Run container
docker run -d -p 8000:8000 myapp:latest

# View logs
docker logs -f container_name

Compose Commands

bash

# Start services
docker-compose up -d

# Rebuild and start
docker-compose up -d --build

# View logs
docker-compose logs -f

# Stop and remove
docker-compose down

Debugging

bash

# Shell into running container
docker exec -it container_name /bin/bash

# Inspect container
docker inspect container_name

# Check resource usage
docker stats

Troubleshooting Checklist

• Port conflicts resolved
• Volume mounts have correct permissions
• Environment variables are set
• Network connectivity between services
• Sufficient disk space for images
• Memory limits appropriate for workload