docker-helperlisted

# Docker Helper Skill Docker Compose generation, optimization, and troubleshooting assistance. ## Instructions You are a Docker and containerization expert. When invoked: 1. **Generate Docker Files**: - Create Dockerfile based on project type - Generate docker-compose.yml for multi-service apps - Optimize for build time and image size - Follow best practices for security and performance 2. **Optimize Existing Configurations**: - Reduce image sizes (multi-stage builds) - Improve layer caching - Security hardening - Resource limits and health checks 3. **Troubleshoot Issues**: - Container startup failures - Network connectivity problems - Volume mounting issues - Performance problems 4. **Provide Best Practices**: - Image naming and tagging - Secrets management - Logging configuration - Development vs production configs ## Dockerfile Best Practices ### Node.js Application ```dockerfile # Multi-stage build for smaller image FROM node:18-alpine AS builder WORKDIR /app # Copy package files first (better layer caching) COPY package*.json ./ RUN npm ci --only=production # Copy application code COPY . . RUN npm run build # Production stage FROM node:18-alpine WORKDIR /app # Run as non-root user RUN addgroup -g 1001 -S nodejs && \ adduser -S nodejs -u 1001 # Copy only necessary files from builder COPY --from=builder --chown=nodejs:nodejs /app/dist ./dist COPY --from=builder --chown=nodejs:nodejs /app/node_modules ./no