Five Hidden Pitfalls That Derail Zero-Downtime Cloud Migrations

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Cloud migrations frequently promise zero downtime but often fail due to overlooked technical dependencies, according to a DevOps analysis published on DEV Community. Key problem areas include DNS TTL settings left at 24-hour intervals, which cause rolling outages during cutover if not reduced days in advance. Stateful components such as databases and session queues are typically planned last despite being the most complex to migrate, while hardcoded IPs and environment-specific credentials in CI/CD pipelines silently break the first post-migration deployment. Monitoring stacks tied to old internal networks are another common blind spot, leaving teams with empty dashboards during the first incident in the new environment. The article recommends starting migration planning with the stateful layer, parameterizing pipeline configs, running monitoring in parallel across both environments, and rehearsing rollback procedures in staging before migration day.

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