What Is Application Migration to Cloud?
Application migration to cloud is the process of moving software applications from on-premise infrastructure to cloud platforms like AWS, Azure, or Google Cloud. The migration strategy depends on application architecture, business requirements, and the desired level of cloud-native optimization.
The 6 Rs of Cloud Migration
AWS defines six migration strategies, each with different levels of effort, cost, and cloud optimization.
| Strategy | Description | Effort | Cloud Optimization |
|---|---|---|---|
| Rehost (Lift & Shift) | Move as-is to cloud VMs | Low | Minimal |
| Replatform (Lift & Reshape) | Minor optimizations during migration | Medium | Moderate |
| Refactor (Re-architect) | Rebuild for cloud-native architecture | High | Maximum |
| Repurchase | Replace with SaaS solution | Medium | N/A (SaaS) |
| Retire | Decommission unused applications | Low | N/A |
| Retain | Keep on-premise for now | None | None |
Cloud Migration Process
A structured migration follows five phases: discovery, planning, migration, optimization, and ongoing management.
- Discovery: Inventory applications, dependencies, and data flows
- Planning: Select migration strategy per application, design target architecture
- Migration: Execute migration in waves, validate functionality
- Optimization: Right-size resources, implement auto-scaling, optimize costs
- Management: Ongoing monitoring, security, and optimization
Common Cloud Migration Challenges
The most common challenges are data migration complexity, application dependency mapping, downtime management, and cost overruns.
- Data migration: Large datasets require careful transfer planning
- Dependencies: Hidden application interdependencies cause failures
- Downtime: Business-critical apps need zero or near-zero downtime strategies
- Security: Cloud security differs from on-premise models
- Skills gap: Teams may lack cloud-native expertise
Choosing a Cloud Migration Partner
Evaluate migration partners on multi-cloud expertise, migration tooling, and post-migration managed services.
Opsio provides cloud migration services across AWS, Azure, and GCP. Contact us to plan your migration.
Frequently Asked Questions
How long does app migration to cloud take?
Simple rehost: 2-4 weeks per application. Complex refactoring: 3-6 months. Enterprise-wide migration: 6-18 months in waves.
What is the 6 Rs migration framework?
Six strategies: Rehost, Replatform, Refactor, Repurchase, Retire, and Retain. Each offers different levels of effort and cloud optimization.
How much does cloud migration cost?
$5,000-$50,000 for simple workloads. $100,000-$500,000+ for enterprise migrations. Costs depend on complexity and strategy.
What is the biggest risk in cloud migration?
Inadequate dependency mapping leading to application failures after migration. Thorough discovery prevents this.
Should I rehost or refactor?
Rehost for quick migration with minimal disruption. Refactor when you need cloud-native benefits like auto-scaling, microservices, or serverless architecture.