Lessons from Production Migrations: Troubleshooting Complex Issues with AWS Application Migration Service
Migration and Modernization Blog
This article presents four real-world troubleshooting scenarios from enterprise migrations using AWS Application Migration Service, with practical resolution strategies for production workloads.
- MGN agent installation failure resolved by switching to agentless migration; corrupted disk recovered using rsync over SSH
- Encrypted non-root drive made inaccessible post-cutover; resolved via EBS snapshot copy, offline decryption, and drive letter reassignment
- Java web application blocking every 2 hours caused by EBS initialization delay and database connection pool misconfiguration; fixed by tuning JBoss DataSource settings
- Test launch failure due to initramfs file rename and XFS metadata corruption; resolved by filesystem repair on source before migration
- Pre-migration assessment including encryption status, filesystem health checks, and fstab validation prevents most cutover issues
- Post-cutover stabilization window of 3-5 days with CloudWatch monitoring and application-level tuning is essential
Thorough pre-migration server audits and documented fallback approaches significantly reduce mean time to resolution and build confidence across successive migration waves.
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