Executive summary
Planning and executing phased migration patterns for legacy virtual machines into AWS.
- Client type
- Enterprise IT
- Industry
- Multi-industry
Challenge
Existing VM estates lacked standard infrastructure definitions and repeatable migration patterns.
Solution
Built migration waves, standard images, and reusable infrastructure patterns to reduce variation.
Outcome
Teams achieved repeatable migration execution with stronger operational consistency.
Services
- Discovery and assessment
- Migration architecture
- Terraform foundations
Technologies
- AWS
- EC2
- VPC
- Terraform
Architecture decision
The platform approach prioritized repeatable infrastructure patterns and clear ownership boundaries.
Implementation
Implementation aligned infrastructure standards, automation flows, and team runbooks for operational consistency.
Security considerations
Baseline controls focused on identity, access boundaries, encryption, and standardized audit visibility.
Operational considerations
Runbooks, monitoring, escalation paths, and patching responsibilities were defined before onboarding workloads.
Lessons learned
Architecture standardization and cross-team ownership alignment are key for sustainable modernization.
Background
The migration program covered diverse applications with different operating requirements.
Architecture decision
A phased landing-zone approach was selected to isolate risk and support controlled onboarding.
Implementation
- Dependency mapping before migration waves
- Standardized network and IAM patterns
- Reusable Terraform modules for EC2 resources
Security considerations
Encryption standards and least-privilege role templates were embedded into deployment patterns.
Operational considerations
Monitoring, patching, and backup ownership were assigned early to avoid handover gaps.
Lessons learned
Migration succeeds when architecture, operations, and application stakeholders align on standards.