The Cloud Migration Journey
Cloud migration is one of the most impactful technology decisions an organization can make. When executed well, it delivers reduced costs, improved scalability, and faster innovation. When done poorly, it creates technical debt and cost overruns.
Phase 1: Assessment and Discovery
Before moving anything, you need a complete picture of what you have.
Application Portfolio Analysis Categorize every application by: - **Business criticality**: How important is this to daily operations? - **Technical complexity**: What dependencies and integrations exist? - **Cloud readiness**: How much modification is needed for cloud deployment?
The 6 R's of Migration - **Rehost** (Lift and Shift): Move as-is to cloud VMs - **Replatform**: Minor optimizations (e.g., managed databases) - **Refactor**: Re-architect for cloud-native services - **Repurchase**: Replace with SaaS alternatives - **Retire**: Decommission unnecessary applications - **Retain**: Keep on-premises for now
Phase 2: Planning
Architecture Design Design your target cloud architecture considering: - Network topology (VPCs, subnets, connectivity) - Security boundaries and compliance requirements - Data residency and sovereignty requirements - Disaster recovery and business continuity
Migration Waves Group applications into migration waves based on dependencies and risk: - **Wave 1**: Low-risk, independent applications (quick wins) - **Wave 2**: Medium-complexity applications with few dependencies - **Wave 3**: Complex, business-critical applications
Phase 3: Execution
Zero-Downtime Migration Strategies - **Database replication**: Set up continuous replication before cutover - **DNS-based cutover**: Use DNS changes for seamless traffic switching - **Feature flags**: Control which backend processes use old vs. new infrastructure
Phase 4: Optimization
Post-migration optimization is where the real value emerges: - **Right-sizing**: Match instance sizes to actual workload requirements - **Reserved instances/savings plans**: Commit to usage for significant discounts - **Auto-scaling**: Implement dynamic scaling based on demand - **Cost monitoring**: Set up FinOps practices to track and optimize spend
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