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commands/containerize.md

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+---
+allowed-tools: Read, Write, Edit, Bash
+argument-hint: [application-type] | --node | --python | --java | --go | --multi-stage
+description: Containerize application with optimized Docker configuration, security, and multi-stage builds
+model: claude-sonnet-4-5
+---
+
+# Application Containerization
+
+Containerize application for deployment: $ARGUMENTS
+
+## Current Application Analysis
+
+- Application type: @package.json or @setup.py or @go.mod or @pom.xml (detect runtime)
+- Existing Docker: @Dockerfile or @docker-compose.yml or @compose.yaml (if exists)
+- Dependencies: !find . -name "*requirements*.txt" -o -name "package*.json" -o -name "go.mod" | head -3
+- Port configuration: !grep -r "PORT\|listen\|bind" src/ 2>/dev/null | head -3 || echo "Port detection needed"
+- Build tools: @Makefile or build scripts detection
+
+## Task
+
+Implement production-ready containerization strategy:
+
+1. **Application Analysis and Containerization Strategy**
+   - Analyze application architecture and runtime requirements
+   - Identify application dependencies and external services
+   - Determine optimal base image and runtime environment
+   - Plan multi-stage build strategy for optimization
+   - Assess security requirements and compliance needs
+
+2. **Dockerfile Creation and Optimization**
+   - Create comprehensive Dockerfile with multi-stage builds
+   - Select minimal base images (Alpine, distroless, or slim variants)
+   - Configure proper layer caching and build optimization
+   - Implement security best practices (non-root user, minimal attack surface)
+   - Set up proper file permissions and ownership
+
+3. **Build Process Configuration**
+   - Configure .dockerignore file to exclude unnecessary files
+   - Set up build arguments and environment variables
+   - Implement build-time dependency installation and cleanup
+   - Configure application bundling and asset optimization
+   - Set up proper build context and file structure
+
+4. **Runtime Configuration**
+   - Configure application startup and health checks
+   - Set up proper signal handling and graceful shutdown
+   - Configure logging and output redirection
+   - Set up environment-specific configuration management
+   - Configure resource limits and performance tuning
+
+5. **Security Hardening**
+   - Run application as non-root user with minimal privileges
+   - Configure security scanning and vulnerability assessment
+   - Implement secrets management and secure credential handling
+   - Set up network security and firewall rules
+   - Configure security policies and access controls
+
+6. **Docker Compose Configuration**
+   - Create compose.yaml for local development
+   - Configure service dependencies and networking
+   - Set up volume mounting and data persistence
+   - Configure environment variables and secrets
+   - Set up development vs production configurations
+
+7. **Container Orchestration Preparation**
+   - Prepare configurations for Kubernetes deployment
+   - Create deployment manifests and service definitions
+   - Configure ingress and load balancing
+   - Set up persistent volumes and storage classes
+   - Configure auto-scaling and resource management
+
+8. **Monitoring and Observability**
+   - Configure application metrics and health endpoints
+   - Set up logging aggregation and centralized logging
+   - Configure distributed tracing and monitoring
+   - Set up alerting and notification systems
+   - Configure performance monitoring and profiling
+
+9. **CI/CD Integration**
+   - Configure automated Docker image building
+   - Set up image scanning and security validation
+   - Configure image registry and artifact management
+   - Set up automated deployment pipelines
+   - Configure rollback and blue-green deployment strategies
+
+10. **Testing and Validation**
+    - Test container builds and functionality
+    - Validate security configurations and compliance
+    - Test deployment in different environments
+    - Validate performance and resource utilization
+    - Test backup and disaster recovery procedures
+    - Create documentation for container deployment and management