# Docker Management

Build, optimize, and troubleshoot Docker containers and images.

- Repository: https://github.com/BagelHole/DevOps-Security-Agent-Skills (1187 stars)
- Category: Testing
- License: MIT
- Last updated: 2026-05-22
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add BagelHole/DevOps-Security-Agent-Skills --skill docker-management -g -a claude-code -y`
Codex: `npx skills add BagelHole/DevOps-Security-Agent-Skills --skill docker-management -g -a codex -y`
Cursor: `npx skills add BagelHole/DevOps-Security-Agent-Skills --skill docker-management -g -a cursor -y`
Gemini CLI: `npx skills add BagelHole/DevOps-Security-Agent-Skills --skill docker-management -g -a gemini-cli -y`

## Description

Build, optimize, and troubleshoot Docker containers and images. Create efficient Dockerfiles, manage container lifecycle, configure networking and volumes, and debug container issues. Use when working with Docker, containerization, or container troubleshooting.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Docker Management

Build, run, and manage Docker containers for application deployment and development.

## When to Use This Skill

Use this skill when:
- Creating and optimizing Dockerfiles
- Building and tagging Docker images
- Running and managing containers
- Debugging container issues
- Configuring Docker networking and volumes
- Implementing container security best practices

## Prerequisites

- Docker Engine installed (20.10+)
- Basic command line knowledge
- Understanding of application deployment

## Dockerfile Best Practices

### Multi-Stage Build

```dockerfile
# Build stage
FROM node:20-alpine AS builder
WORKDIR /app
COPY package*.json ./
RUN npm ci --only=production
COPY . .
RUN npm run build

# Production stage
FROM node:20-alpine AS production
WORKDIR /app
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nodejs -u 1001
COPY --from=builder --chown=nodejs:nodejs /app/dist ./dist
COPY --from=builder --chown=nodejs:nodejs /app/node_modules ./node_modules
USER nodejs
EXPOSE 3000
CMD ["node", "dist/index.js"]
```

### Layer Optimization

```dockerfile
FROM python:3.12-slim

# Install dependencies first (cached unless requirements change)
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy application code (changes frequently)
COPY . .

CMD ["python", "app.py"]
```

### Security Hardening

```dockerfile
FROM node:20-alpine

# Create non-root user
RUN addgroup -g 1001 appgroup && \
    adduser -u 1001 -G appgroup -D appuser

WORKDIR /app

# Copy with proper ownership
COPY --chown=appuser:appgroup . .

# Drop privileges
USER appuser

# Use exec form for proper signal handling
CMD ["node", "server.js"]
```

## Building Images

### Basic Build

```bash
# Build with tag
docker build -t myapp:1.0 .

# Build with build args
docker build --build-arg NODE_ENV=production -t myapp:prod .

# Build for specific platform
docker build --platform linux/amd64 -t myapp:amd64 .

The rest: https://github.com/BagelHole/DevOps-Security-Agent-Skills/blob/HEAD/devops/containers/docker-management/SKILL.md