dbis_core/docs/deployment.md

Deployment Guide

This guide provides comprehensive instructions for deploying the DBIS Core Banking System to production.

Deployment Architecture

graph TB
    subgraph "Production Environment"
        LB[Load Balancer]
        
        subgraph "Application Tier"
            APP1[App Instance 1]
            APP2[App Instance 2]
            APPN[App Instance N]
        end
        
        subgraph "Database Tier"
            DB_PRIMARY[(Primary Database)]
            DB_REPLICA1[(Replica 1)]
            DB_REPLICA2[(Replica 2)]
        end
        
        subgraph "Cache Tier"
            CACHE1[(Redis 1)]
            CACHE2[(Redis 2)]
        end
        
        subgraph "Monitoring"
            METRICS[Metrics Collector]
            LOGS[Log Aggregator]
        end
        
        LB --> APP1
        LB --> APP2
        LB --> APPN
        
        APP1 --> DB_PRIMARY
        APP2 --> DB_PRIMARY
        APPN --> DB_PRIMARY
        
        DB_PRIMARY --> DB_REPLICA1
        DB_PRIMARY --> DB_REPLICA2
        
        APP1 --> CACHE1
        APP2 --> CACHE2
        
        APP1 --> METRICS
        APP2 --> METRICS
        APPN --> METRICS
        
        APP1 --> LOGS
        APP2 --> LOGS
        APPN --> LOGS
    end

CI/CD Pipeline

graph LR
    subgraph "CI/CD Pipeline"
        COMMIT[Git Commit]
        BUILD[Build]
        TEST[Run Tests]
        LINT[Lint & Format]
        SECURITY[Security Scan]
        DEPLOY[Deploy]
    end
    
    COMMIT --> BUILD
    BUILD --> TEST
    TEST --> LINT
    LINT --> SECURITY
    SECURITY --> DEPLOY

Production Setup

Environment Variables

All required environment variables must be set in production:

• DATABASE_URL - PostgreSQL connection string
• JWT_SECRET - Must be at least 32 characters, use strong random string
• ALLOWED_ORIGINS - Comma-separated list of allowed CORS origins (no wildcards)
• NODE_ENV - Set to production
• LOG_LEVEL - Recommended: info or warn
• HSM_ENABLED - Set to true if using HSM hardware

Database Migrations

1. Generate Prisma client:

   npx prisma generate
   

2. Run migrations:

   npx prisma migrate deploy
   

3. Verify migration status:

   npx prisma migrate status
   

Build Process

1. Install dependencies:

   npm ci
   

2. Generate Prisma client:

   npx prisma generate
   

3. Build TypeScript:

   npm run build
   

4. Start the application:

   npm start
   

Health Checks

The application provides a health check endpoint at /health that verifies:

• Database connectivity
• HSM availability (if enabled)
• Application status

Monitoring Setup

1. Configure logging to external service (if needed)
2. Set up metrics collection (Prometheus)
3. Configure alerting for critical errors
4. Monitor database performance

Security Checklist

• All environment variables validated
• JWT_SECRET is strong and secure
• CORS origins are properly configured
• HSM is enabled and configured
• Database credentials are secure
• Rate limiting is configured
• Security headers are enabled (Helmet)
• Audit logging is enabled

Scaling Considerations

• Use connection pooling for database
• Consider horizontal scaling with load balancer
• Monitor resource usage
• Set up database read replicas if needed

Deployment Recommendations

Infrastructure as Code

Priority: High

1. Infrastructure Automation

   • Description: Use Infrastructure as Code (IaC) for all infrastructure
   • Implementation:
     • Use Terraform or CloudFormation
     • Version control infrastructure code
     • Automate provisioning and updates
   • Impact: Ensures consistent infrastructure and reduces manual errors
   • Dependencies: IaC tool configured, cloud provider access

2. Environment Management

   • Description: Separate environments for dev, staging, production
   • Implementation:
     • Use environment-specific configurations
     • Never use production data in dev
     • Secure environment variables
   • Impact: Prevents production issues and data leaks
   • Dependencies: Environment separation configured

Deployment Strategy

Priority: High

1. Blue-Green Deployment

   • Description: Implement blue-green deployment strategy
   • Implementation:
     • Deploy new version alongside current version
     • Switch traffic after validation
     • Keep previous version for rollback
   • Impact: Enables zero-downtime deployments
   • Dependencies: Load balancer, deployment automation

2. Database Migration Strategy

   • Description: Safe database migration process
   • Implementation:
     • Test migrations in staging
     • Backup before migrations
     • Plan rollback procedures
     • Use migration versioning
   • Impact: Prevents data loss and downtime
   • Dependencies: Database backup system, migration tools

Monitoring & Alerting

Priority: Critical

1. Health Monitoring

   • Description: Comprehensive health monitoring
   • Implementation:
     • Monitor application health endpoints
     • Track database connectivity
     • Monitor HSM availability
     • Set up alerting for failures
   • Impact: Enables proactive issue detection
   • Dependencies: Monitoring infrastructure, alerting system

2. Performance Monitoring

   • Description: Monitor system performance
   • Implementation:
     • Track API response times
     • Monitor database query performance
     • Track resource utilization
     • Set performance alerts
   • Impact: Enables performance optimization
   • Dependencies: APM tools, metrics collection

Disaster Recovery

Priority: Critical

1. Backup Strategy

   • Description: Automated backup system
   • Implementation:
     • Daily full backups
     • Hourly incremental backups
     • Store backups in multiple locations
     • Test restore procedures regularly
   • Impact: Enables recovery from data loss
   • Dependencies: Backup storage, backup automation

2. Multi-Region Deployment

   • Description: Deploy across multiple regions
   • Implementation:
     • Deploy active-active in primary regions
     • Implement cross-region replication
     • Test failover procedures
     • Monitor cross-region latency
   • Impact: Ensures availability during regional outages
   • Dependencies: Multi-region infrastructure, replication configured

For more detailed recommendations, see RECOMMENDATIONS.md and monitoring.md.