docker-management

1# Docker Management
2 
3Build, run, and manage Docker containers for application deployment and development.
4 
5## When to Use This Skill
6 
7Use this skill when:
8- Creating and optimizing Dockerfiles
9- Building and tagging Docker images
10- Running and managing containers
11- Debugging container issues
12- Configuring Docker networking and volumes
13- Implementing container security best practices
14 
15## Prerequisites
16 
17- Docker Engine installed (20.10+)
18- Basic command line knowledge
19- Understanding of application deployment
20 
21## Dockerfile Best Practices
22 
23### Multi-Stage Build
24 
25```dockerfile
26# Build stage
27FROM node:20-alpine AS builder
28WORKDIR /app
29COPY package*.json ./
30RUN npm ci --only=production
31COPY . .
32RUN npm run build
33 
34# Production stage
35FROM node:20-alpine AS production
36WORKDIR /app
37RUN addgroup -g 1001 -S nodejs && \
38    adduser -S nodejs -u 1001
39COPY --from=builder --chown=nodejs:nodejs /app/dist ./dist
40COPY --from=builder --chown=nodejs:nodejs /app/node_modules ./node_modules
41USER nodejs
42EXPOSE 3000
43CMD ["node", "dist/index.js"]
44```
45 
46### Layer Optimization
47 
48```dockerfile
49FROM python:3.12-slim
50 
51# Install dependencies first (cached unless requirements change)
52COPY requirements.txt .
53RUN pip install --no-cache-dir -r requirements.txt
54 
55# Copy application code (changes frequently)
56COPY . .
57 
58CMD ["python", "app.py"]
59```
60 
61### Security Hardening
62 
63```dockerfile
64FROM node:20-alpine
65 
66# Create non-root user
67RUN addgroup -g 1001 appgroup && \
68    adduser -u 1001 -G appgroup -D appuser
69…