Zero-Downtime MySQL to Aurora Migration: An Enterprise-Grade AWS DMS Runbook
Modernizing databases is rarely about “just moving data.” It is about consistency, safety, rollback readiness, and zero downtime. In this post, I walk through a production-proven MySQL → Amazon Aurora MySQL migration using AWS Database Migration Service (DMS) with Full Load + Change Data Capture (CDC). This guide is based on real-world enterprise migrations and focuses on what actually breaks in production—and how to prevent it. Components • Source: MySQL (on-premises or EC2) • Target: Amazon Aurora MySQL (private subnets) • Migration Engine: AWS DMS (Full Load + CDC) • Networking: VPC, private subnets, NAT Gateway • Access: Bastion host for controlled administration • Observability: CloudWatch logs and metrics Why This Architecture Works • No application downtime during bulk load • Continuous replication via binlogs • Controlled, reversible cutover ...