Cloud Infrastructure Migration from AWS to a Cost-Optimized Private Cloud

Client

Confidential

Challenge

The client needed to migrate their entire AWS infrastructure to an alternative cloud provider to reduce costs and eliminate vendor lock-in. The key requirements were minimal downtime, zero functionality loss, and a reliable rollback strategy.

Solution

1. Audit & Planning
  • Full inventory of AWS resources (EC2, RDS, S3, VPC)
  • Service mapping: AWS β†’ target cloud equivalents
  • Phased migration plan with clear milestones
  • Rollback strategy for each stage
2. Infrastructure Preparation
  • Terraform for IaC on the target platform
  • VPC, subnets, and security groups configuration
  • Managed PostgreSQL and Redis deployment
  • Object Storage setup (S3-compatible)
3. Data Migration
  • Database replication via DMS
  • S3 β†’ Object Storage sync
  • Docker image transfer to private Container Registry
  • Full validation on staging environment
4. Production Cutover
  • DNS failover for gradual traffic switching
  • Real-time metrics monitoring during cutover
  • AWS kept on standby for emergency rollback
  • Final cutover completed in 2 hours

Technologies

AWS
AWS
Terraform
Terraform
Prometheus
Prometheus
Grafana
Grafana
GitLab CI
GitLab CI

Results

βœ… Cost reduction: 40% savings (from $15k to $9k/month)
βœ… Downtime: only 2 hours vs. 8 hours planned
βœ… Vendor independence: full exit from AWS with no functionality loss
βœ… Performance: maintained at the same level post-migration
βœ… Compliance: data residency and security requirements met

Architecture

graph LR A[AWS: EC2, RDS, S3] --> B[Terraform] B --> C[Yandex Cloud: Compute, PostgreSQL, Object Storage]

Duration

2 weeks (planning + migration)

Starting price

from $1,500