A complete guide to planning and executing an AWS-to-GCP migration project. Covers service mapping, migration tooling, phase splitting, TCO estimation, and the organizational success factors.
| Strategy | Description | Use case |
|---|---|---|
| Rehost (Lift & Shift) | EC2 → GCE as-is | Fast migration |
| Replatform | EC2 → Cloud Run / GKE Autopilot | Operational efficiency |
| Repurchase | Switch to SaaS | Commercial solutions |
| Refactor / Re-architect | Cloud-native rewrite | Long-term competitiveness |
| Retire | Decommission | Unneeded systems |
| Retain | Keep on AWS | Hard to migrate / cost rationale |
| AWS | GCP |
|---|---|
| EC2 | Compute Engine (GCE) |
| ECS | Cloud Run (simple) / GKE Autopilot |
| EKS | GKE |
| Lambda | Cloud Functions 2nd gen |
| Fargate | Cloud Run / GKE Autopilot |
| Elastic Beanstalk | App Engine / Cloud Run |
| S3 | Cloud Storage |
| EFS / FSx | Filestore |
| RDS | Cloud SQL |
| Aurora | AlloyDB |
| Aurora DSQL | Spanner |
| DynamoDB | Firestore / Bigtable |
| ElastiCache | Memorystore |
| Redshift | BigQuery |
| Athena | BigQuery / BigLake |
| EMR | Dataproc |
| Kinesis | Pub/Sub + Dataflow |
| SNS / SQS | Pub/Sub + Cloud Tasks |
| EventBridge | Eventarc |
| Step Functions | Workflows / Cloud Composer |
| CloudFront | Cloud CDN / Media CDN |
| Route 53 | Cloud DNS |
| VPC | VPC (Global) |
| Direct Connect | Cloud Interconnect |
| IAM | IAM (+ Cloud Identity) |
| KMS | Cloud KMS / HSM / EKM |
| CloudWatch | Cloud Monitoring + Logging |
| X-Ray | Cloud Trace |
| Bedrock | Vertex AI Model Garden |
| SageMaker | Vertex AI |
| CodeBuild / CodeDeploy | Cloud Build / Cloud Deploy |
| ECR | Artifact Registry |
| WAF | Cloud Armor |
| Method | Use case | Pricing |
|---|---|---|
| Storage Transfer Service (online) | S3 → GCS, scheduled sync | AWS egress + standard GCS pricing |
| Transfer Appliance | PB scale, low-bandwidth on-prem | $300/month + shipping |
| BigQuery Data Transfer | Redshift → BigQuery | Free + Redshift egress |
| Datastream | Real-time CDC | $0.30/GB |
| Cloud Interconnect | Dedicated line | VLAN Attachment + standard egress |
Why migrate from AWS to GCP?
Cost optimization (Sustained Use Discount / TPU), stronger AI and data analytics (BigQuery / Gemini), better container UX (Cloud Run / GKE Autopilot), and as part of a multi-cloud strategy.
How long does a migration take?
Small (10 apps): 3-6 months. Medium (50-100 apps): 12-18 months. Large (500+ apps): 24-36 months. A phase-by-phase approach is the realistic option.
What is the AWS to GCP service mapping?
EC2 to GCE, ECS to Cloud Run / GKE, Lambda to Cloud Functions, S3 to Cloud Storage, RDS to Cloud SQL, Aurora to AlloyDB, DynamoDB to Firestore / Bigtable, Redshift to BigQuery, and so on.
What about egress charges?
AWS to GCP egress incurs roughly $0.09/GB on the AWS side. For large data migrations, use Cloud Storage Transfer Service Online (pull-based) or Transfer Appliance (physical).
How long is the parallel-operation period?
Typically 3-6 months: both clouds running with data synchronized. You want to minimize it because of egress costs and operational load.
Can my AWS knowledge be reused?
About 80% of the concepts overlap (VPC / IAM / Compute / Storage, etc.). The deltas can be learned in 2-4 weeks. AWS SAP holders can typically pass GCP PCA in 1-2 months.
What are common failure patterns?
Big-bang (one-shot) migration is dangerous. Phase splitting with minimal-impact validation at each phase is essential. Organizationally, early alignment with the cost owner (CFO) is also key.
How do I estimate TCO?
Google Cloud Migration Center can automatically estimate AWS-to-GCP TCO. Typical savings are 15-30% (Sustained Use Discount + CUD + TPU, etc.).
Related Articles - Migration / Multi-cloud
GCP vs AWS ストレージ・DB 徹底比較｜GCS/S3・BigQuery/Redshift・Spanner/DynamoDB (2026)
GCP と AWS のストレージ・データベースを徹底比較。Cloud Storage vs S3、BigQuery vs Redshift、Spanner vs DynamoDB / Aurora DSQL、Cloud SQL vs RDS、AlloyDB vs Aurora、Firestore vs DynamoDB、Bigtable vs DynamoDB を 2026 年最新版で網羅。
GCP vs AWS コンピュート徹底比較｜EC2/GCE・GKE/EKS・Lambda/Cloud Run・料金 (2026)
GCP と AWS のコンピュートサービスを徹底比較。Compute Engine vs EC2、GKE vs EKS、Cloud Run vs Lambda、App Engine vs Elastic Beanstalk、GPU/TPU、Arm 系 (Axion vs Graviton)、料金体系・Sustained Use Discount を 2026 年最新版で網羅。
Database Migration Service (DMS) 完全ガイド｜Oracle/MySQL/PG → Cloud SQL/AlloyDB (GCP)
Google Cloud Database Migration Service の全機能解説。Oracle / MySQL / PostgreSQL / SQL Server / MongoDB → Cloud SQL / AlloyDB / BigQuery / Firestore 移行。Heterogeneous 移行、Continuous Migration、料金、AWS DMS 比較を 2026 年最新版で網羅。
Cloud Storage 完全ガイド｜料金・Storage Class・Lifecycle・AWS S3 比較 (GCP)
Google Cloud Storage の全機能解説。Storage Class (Standard/Nearline/Coldline/Archive)、Multi-region、Object Lifecycle、Versioning、Signed URL、Uniform IAM、AWS S3 / Azure Blob 比較を網羅。
Note: Google Cloud and AWS are trademarks of their respective owners. For the latest, see the official Migration Center page.
Practice with certification-focused question sets
Go to the GCP exam prep pageNicheeLab Editorial Team
NicheeLab editorial team focused on data engineering and cloud certification learning. Content is structured around practical study needs and official exam domains.
Google Cloud Certification Roadmap (2026)
Choose your GCP certification path — Foundational, Associate...
CDL Cloud Digital Leader: Complete Exam Guide (2026)
Pass the Cloud Digital Leader exam — cloud business value, G...
GAIL Generative AI Leader: Complete Exam Guide (2026)
Pass the Generative AI Leader exam — Gemini, Vertex AI, Work...
Vertex AI Fundamentals for GCP Certs (2026)
Vertex AI basics every cert candidate needs — Workbench, Pip...
Associate Cloud Engineer (ACE): Complete Guide (2026)
Pass the Associate Cloud Engineer exam — Console, gcloud, pr...