Cloud Migration Checklist: 12 Steps to a Smooth Transition

Cloud migration isn't just "move everything to AWS." Done well, it transforms your infrastructure. Done poorly, it costs more than what you had before and adds complexity without benefit.

Here's the checklist I use with every migration project.

Phase 1: Assessment

1. Inventory Everything

Before you move anything, know what you have:

All servers and their configurations
Applications and their dependencies
Databases and data volumes
Network configurations
Current monthly infrastructure costs

You can't plan a move if you don't know what you're moving.

2. Classify Your Workloads

Not everything should move to the cloud the same way. For each application, decide:

Rehost (lift and shift): Move as-is. Fastest but fewest benefits.
Replatform (lift and optimize): Make minor adjustments to leverage cloud features.
Refactor: Rebuild to be cloud-native. Most benefit, most effort.
Retire: Turn it off. You'd be surprised how many apps nobody uses.

3. Choose Your Cloud Provider

Consider:

Where is your team's existing expertise?
What managed services do you need? (specific databases, ML tools, etc.)
Where are your customers geographically?
What are the compliance requirements?

There's no universally "best" provider. AWS has the most services, Azure integrates best with Microsoft shops, and GCP excels at data and ML workloads.

Phase 2: Planning

4. Design Your Architecture

Key decisions:

Networking: VPC layout, subnets, security groups
Compute: VMs vs. containers vs. serverless
Storage: Block, object, or file storage for each use case
Database: Managed services vs. self-hosted

5. Plan for Security

Security in the cloud is different from on-premises:

Identity and access management — least privilege, always
Encryption — at rest and in transit
Network security — security groups, NACLs, private subnets
Compliance — ensure your cloud setup meets your regulatory requirements

6. Estimate Costs

Use the provider's pricing calculator. Account for:

Compute and storage costs
Data transfer costs (this catches people off guard)
Managed service fees
Reserved instances vs. on-demand pricing

Add a 20% buffer. Migration always costs more than the estimate.

Phase 3: Execution

7. Set Up the Landing Zone

Before migrating anything:

Create accounts/subscriptions with proper organization
Configure networking and VPN/interconnect
Set up monitoring and logging
Implement backup policies
Configure IAM roles and policies

8. Migrate in Phases

Never do a "big bang" migration. Start with low-risk, low-complexity workloads:

Static websites and simple applications
Development and testing environments
Non-critical production workloads
Critical production systems

9. Run in Parallel

Keep your old systems running until the new ones are verified:

Run both environments simultaneously
Compare performance and behavior
Have a rollback plan ready
Only cut over when you're confident

Phase 4: Optimization

10. Right-Size Resources

After migration, your cloud resources are almost certainly over-provisioned. After two weeks of production data:

Review CPU and memory utilization
Downsize instances that are consistently under 40% utilization
Consider reserved instances for stable workloads

11. Implement Cost Controls

Set up billing alerts at 50%, 75%, and 90% of budget
Use auto-scaling to match capacity to demand
Schedule non-production environments to shut down after hours
Review and terminate unused resources monthly

12. Document Everything

Update your documentation:

Architecture diagrams
Runbooks for common operations
Disaster recovery procedures
Onboarding guides for new team members

The Most Important Rule

Don't rush. A cloud migration done in three months that works is infinitely better than one done in three weeks that doesn't. Take the time to plan, test, and validate at every step.

Planning a migration? Get in touch for a free cloud assessment. I'll help you build a migration plan that minimizes risk and maximizes value.