Migration Guide
Migrate from S3 to Cloud Storage
Migrate AWS S3 buckets to Google Cloud Storage. Use gsutil or Storage Transfer Service, remap bucket policies and lifecycle rules.
What you get
Risk assessment
Blockers, warnings, and unknowns ranked by severity
Effort estimate
Hours, t-shirt size, and role breakdown
Cost estimate
Labor, infrastructure, and tooling cost range
Migration steps
Ordered execution plan with durations
Open questions
What still needs to be answered before you start
Draft config or code
Starter configs when the migration path supports it
Why teams migrate from S3 to Cloud Storage
Good fit when
- +Teams moving storage alongside compute to GCP.
- +Organizations wanting simpler storage classes and lifecycle management.
- +Teams leveraging GCP analytics (BigQuery) that need data co-located.
Strengths
- Uniform bucket-level access simplifies permission management.
- Storage Transfer Service handles large-scale migrations automatically.
- Native integration with BigQuery for direct querying of stored data.
Tradeoffs
- S3 bucket policies and ACLs map differently to Cloud Storage IAM.
- S3 event notifications (to Lambda) need equivalent Cloud Functions/Pub/Sub setup.
- Some S3 features (Object Lock, S3 Select) have different Cloud Storage equivalents.
Migration notes
- Use gsutil rsync or Storage Transfer Service for data migration.
- Remap S3 bucket policies to Cloud Storage IAM bindings.
- Translate S3 lifecycle rules to Cloud Storage lifecycle management.
- Update application code to use Cloud Storage client libraries or S3-compatible API.
How it works
Describe your migration
Select S3 as source and Cloud Storage as target. Add context about your setup — configs, docs, architecture notes.
Keshro runs the analysis
Keshro researches the path, finds similar past migrations, and generates a structured assessment with risks, effort, cost, and steps.
Get your plan
Review the migration plan, refine it with your team, and use it as a living document during execution.
Related migrations
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