Contents

Chapter 1

What's Included

This chapter covers the core features and capabilities of Cloud Migration Playbook.

What's Included

CategoryFilesDescription
Terraformlanding_zone.tf, migration_hub.tf, dns_cutover.tf, dms_replication.tf, variables.tfIaC for landing zone, Migration Hub, DMS, and DNS cutover
CloudFormationmigration-hub-setup.yamlAWS Application Migration Service setup
Scriptsmigration_readiness_checker.py, dependency_mapper.py, rollback_planner.py, wave_planner.pyAssessment, dependency mapping, rollback planning, wave scheduling
Docsarchitecture.md, migration_phases.md, rollback_procedures.md, validation_checklist.mdDeep reference docs for every migration phase
Exampleswave_plan.yaml, assessment_template.jsonReady-to-use planning documents

Migration Strategy Overview (The 6 R's)

┌─────────────┬──────────────┬───────────────────────────────────────────┐
│ Strategy    │ Effort       │ When to use                               │
├─────────────┼──────────────┼───────────────────────────────────────────┤
│ Rehost      │ Low          │ Lift-and-shift. Fast migration, optimize  │
│ (Lift&Shift)│              │ later. Best for meeting a deadline.       │
├─────────────┼──────────────┼───────────────────────────────────────────┤
│ Replatform  │ Low-Medium   │ Minor cloud optimizations during move.    │
│ (Lift&Tinker│              │ E.g., move to managed DB (RDS).          │
├─────────────┼──────────────┼───────────────────────────────────────────┤
│ Refactor    │ High         │ Rearchitect for cloud-native. Containers, │
│             │              │ serverless, microservices.                │
├─────────────┼──────────────┼───────────────────────────────────────────┤
│ Repurchase  │ Medium       │ Replace with SaaS. E.g., on-prem CRM →   │
│             │              │ Salesforce, Exchange → O365.              │
├─────────────┼──────────────┼───────────────────────────────────────────┤
│ Retire      │ None         │ Decommission. No longer needed.           │
├─────────────┼──────────────┼───────────────────────────────────────────┤
│ Retain      │ None         │ Keep on-prem. Not a fit for cloud yet.    │
└─────────────┴──────────────┴───────────────────────────────────────────┘

Prerequisites

  • AWS Account with Organizations set up (recommended)
  • Terraform >= 1.5.0
  • Python >= 3.10 (stdlib only -- no pip packages needed)
  • AWS CLI configured with admin credentials for the migration account
  • Network connectivity between source and target environments (VPN or Direct Connect)
Chapter 2

Quick Start

Follow this guide to get Cloud Migration Playbook up and running in your environment.

Quick Start

1. Run Migration Readiness Assessment

bash
python3 scripts/migration_readiness_checker.py
# Generates a scored assessment of your migration readiness

2. Map Application Dependencies

bash
python3 scripts/dependency_mapper.py
# Produces a dependency graph and wave grouping suggestions

3. Generate Wave Plan

bash
python3 scripts/wave_planner.py --total-apps 50 --wave-size 8
# Creates a phased migration schedule with risk scoring

4. Deploy Landing Zone

bash
cd terraform/
cp terraform.tfvars.example terraform.tfvars
# Edit terraform.tfvars with your values
terraform init && terraform plan && terraform apply

5. Plan Rollback Strategy

bash
python3 scripts/rollback_planner.py
# Generates rollback procedures for each migration pattern

Migration Phases

This playbook follows a proven 5-phase approach:

Phase 1          Phase 2        Phase 3         Phase 4         Phase 5
DISCOVER    →    PLAN      →    MIGRATE    →    VALIDATE   →    OPTIMIZE
                                                                    
Assessment       Wave plan      Execute per     Functional      Right-size
Dependency map   Landing zone   wave:           Performance     Cost optimize
6R decisions     Rollback plan  - Rehost        Security        Decommission
Readiness score  DMS setup      - Replatform    Compliance      RI purchases
                 DNS planning   - Refactor      Rollback test

See docs/migration_phases.md for detailed guidance on each phase.

Cost Notes

  • AWS Migration Hub: Free (tracking and visibility)
  • Application Migration Service: Free for 90 days per source server, then $0.042/hour
  • DMS Replication Instances: $0.018-$0.636/hour depending on instance type
  • Data Transfer In: Free (AWS does not charge for inbound data transfer)
  • Direct Connect: $0.03-$0.09/GB depending on port speed + partner charges
  • Landing Zone infrastructure: Varies, typically $200-500/month for VPC, VPN, Transit Gateway
Chapter 3
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