Migrating all projects from AWS Landing Zone to AWS Control Tower

Project overview

Project aimed to migrate all existing projects and their associated data, resources, and dependencies from AWS Landing Zone (LZ) to AWS Control Tower (CT) for one of the largest healthcare provider company in Singapore. This transition was initiated to leverage AWS Control Tower’s enhanced governance, automation, and simplified multi-account management capabilities. A key objective was to minimize downtime during the migration and to ensure uninterrupted business operations.

The challenge of project

Minimizing downtime: Maintaining operational continuity and minimizing service interruptions for active projects during the migration.
Data migration: Ensuring accurate and seamless data transfer, avoiding corruption or loss.
Complex dependencies: Migrating dependencies, such as IAM roles, networking, and policies, while ensuring compatibility with AWS Control Tower's configuration.
Customizations in AWS Landing Zone: Handling legacy customizations that did not align with AWS Control Tower's native features.
Compliance: Ensuring that all migrated accounts and resources adhered to organizational compliance and security policies.

Solution

Discovery phase: Conducted a comprehensive assessment of existing AWS Landing Zone configurations, dependencies, and customizations.
Planning and design: Developed a migration plan including a detailed timeline, resource allocation, and rollback strategies. Designed the AWS Control Tower environment to accommodate existing projects and dependencies.
Incremental migration: Adopted a phased migration approach to minimize downtime, prioritizing non-critical projects initially and using lessons learned for critical project migrations.
Automation tools: Leveraged AWS DataSync, AWS DMS, AWS CloudFormation, and custom scripts to automate account setup, data migration, and dependency transfer.
Testing and validation: Conducted rigorous testing at each phase to ensure successful migration and full functionality in the new environment.
Stakeholder communication: Maintained clear communication with all stakeholders to ensure smooth coordination and issue resolution.

Final results

Seamless transition: Successfully migrated all projects with minimal downtime, ensuring uninterrupted business operations.
Enhanced governance: Achieved better governance and compliance management through AWS Control Tower’s built-in guardrails and automation features.
Improved scalability: Enabled more efficient account provisioning and streamlined multi-account management.
Cost optimization: Reduced management overhead and costs by leveraging AWS Control Tower’s simplified processes.
Stakeholder satisfaction: Ensured alignment with organizational goals and stakeholder expectations by adhering to timelines and maintaining transparency throughout the project.

Project Details

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