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Development Container Rules and Guidelines

Overview

This document outlines the rules, standards, and best practices that all development containers in this project must follow.

1. Container Security Rules

1.1 User Management

  • REQUIRED: All containers MUST run as non-root users
  • REQUIRED: Use specific UID/GID (1001:1001) for consistency
  • PROHIBITED: Never run applications as root user
  • REQUIRED: Set proper file permissions and ownership

1.2 Image Security

  • REQUIRED: Use official base images from trusted registries
  • REQUIRED: Pin specific image versions (avoid latest tag)
  • REQUIRED: Regularly update base images for security patches
  • REQUIRED: Scan images for vulnerabilities before deployment

1.3 Network Security

  • REQUIRED: Expose only necessary ports
  • REQUIRED: Use internal networks for service communication
  • PROHIBITED: Bind containers to 0.0.0.0 in production
  • REQUIRED: Implement proper firewall rules

2. Performance Standards

2.1 Resource Limits

  • REQUIRED: Set memory limits for all containers
  • REQUIRED: Set CPU limits to prevent resource starvation
  • REQUIRED: Use multi-stage builds to minimize image size
  • REQUIRED: Clean up unnecessary files and cache

2.2 Optimization Rules

  • REQUIRED: Use .dockerignore to exclude unnecessary files
  • REQUIRED: Minimize the number of layers in Dockerfiles
  • REQUIRED: Use caching strategies for dependencies
  • REQUIRED: Implement health checks for all services

3. Development Environment Rules

3.1 Code Organization

  • REQUIRED: Mount source code as volumes for live editing
  • REQUIRED: Preserve node_modules in separate volume
  • REQUIRED: Use consistent directory structure across environments
  • REQUIRED: Implement hot reload for development

3.2 Environment Configuration

  • REQUIRED: Use environment-specific configuration files
  • REQUIRED: Never hardcode secrets or sensitive data
  • REQUIRED: Use .env files for environment variables
  • REQUIRED: Provide .env.example with all required variables

3.3 Debugging Support

  • REQUIRED: Enable debugging ports in development containers
  • REQUIRED: Support for IDE integration (VS Code, etc.)
  • REQUIRED: Implement comprehensive logging
  • REQUIRED: Provide development-specific tools and utilities

4. Data Management Rules

4.1 Volume Management

  • REQUIRED: Use named volumes for persistent data
  • REQUIRED: Implement proper backup strategies
  • REQUIRED: Separate application data from logs
  • REQUIRED: Use read-only volumes where appropriate

4.2 Database Integration

  • REQUIRED: Use containerized databases for development
  • REQUIRED: Implement database migration scripts
  • REQUIRED: Provide database seeding for development
  • REQUIRED: Use connection pooling and proper connection management

5. Service Integration Rules

5.1 Service Communication

  • REQUIRED: Use Docker networks for service communication
  • REQUIRED: Implement service discovery mechanisms
  • REQUIRED: Use environment variables for service configuration
  • REQUIRED: Implement proper retry and timeout strategies

5.2 External Dependencies

  • REQUIRED: Document all external service dependencies
  • REQUIRED: Provide mock services for development
  • REQUIRED: Implement graceful degradation for unavailable services
  • REQUIRED: Use health checks for dependency validation

6. Monitoring and Logging Rules

6.1 Logging Standards

  • REQUIRED: Use structured logging (JSON format)
  • REQUIRED: Implement different log levels (debug, info, warn, error)
  • REQUIRED: Never log sensitive information
  • REQUIRED: Use centralized logging for production

6.2 Health Monitoring

  • REQUIRED: Implement health check endpoints
  • REQUIRED: Monitor resource usage
  • REQUIRED: Set up alerting for critical issues
  • REQUIRED: Implement graceful shutdown procedures

7. Testing Requirements

7.1 Container Testing

  • REQUIRED: Test container builds in CI/CD pipeline
  • REQUIRED: Validate container security configurations
  • REQUIRED: Test service communication between containers
  • REQUIRED: Implement integration tests for the full stack

7.2 Test Environment

  • REQUIRED: Provide isolated test containers
  • REQUIRED: Use test-specific databases and services
  • REQUIRED: Clean up test data after test runs
  • REQUIRED: Parallel test execution support

8. CI/CD Integration Rules

8.1 Build Pipeline

  • REQUIRED: Automated container building and testing
  • REQUIRED: Security scanning in build pipeline
  • REQUIRED: Automated deployment to staging environments
  • REQUIRED: Rollback capabilities for failed deployments

8.2 Version Management

  • REQUIRED: Tag container images with version numbers
  • REQUIRED: Use semantic versioning for releases
  • REQUIRED: Maintain compatibility between versions
  • REQUIRED: Document breaking changes

9. Documentation Requirements

9.1 Container Documentation

  • REQUIRED: Document all environment variables
  • REQUIRED: Provide setup and usage instructions
  • REQUIRED: Document troubleshooting procedures
  • REQUIRED: Maintain up-to-date README files

9.2 Architecture Documentation

  • REQUIRED: Document container architecture and dependencies
  • REQUIRED: Provide service interaction diagrams
  • REQUIRED: Document deployment procedures
  • REQUIRED: Maintain change logs

10. Compliance and Governance

10.1 Security Compliance

  • REQUIRED: Regular security audits
  • REQUIRED: Compliance with organizational security policies
  • REQUIRED: Vulnerability scanning and remediation
  • REQUIRED: Access control and authentication

10.2 Code Quality

  • REQUIRED: Code review for all Dockerfile changes
  • REQUIRED: Automated linting and formatting
  • REQUIRED: Performance benchmarking
  • REQUIRED: Regular dependency updates

Enforcement

These rules are enforced through:

  • Automated CI/CD pipeline checks
  • Code review requirements
  • Security scanning tools
  • Performance monitoring
  • Regular audits

Violations

Violations of these rules will result in:

  1. Build pipeline failures
  2. Mandatory code review and fixes
  3. Security assessment and remediation
  4. Documentation of lessons learned

Updates

This document is reviewed and updated quarterly or when significant changes are made to the development environment.

Last Updated: 2024-01-01 Version: 1.0