How to migrate a production app to a new hosting platform

Production hosting migrations should be treated as staged risk-management projects rather than quick moves, using four phases: creating a complete inventory, running the new stack alongside the old one, preparing and rehearsing rollback procedures, and performing database and DNS cutover. Successful preparation requires administrative access, a designated decision owner, an agreed maintenance window, and ownership for every service, scheduled job, secret, data store, domain, and certificate. Parallel operation allows teams to test production-like data migrations, validate background jobs and integrations, size infrastructure, and avoid duplicate writes or cron executions while the original platform remains available. Rollback plans must establish clear triggers, decision authority, DNS reversal steps, and reliable reconciliation of writes accepted after cutover, ideally through reverse replication or replayable audit logs. Database migration choices determine downtime, with dump-and-restore being simpler but requiring a longer write freeze, while logical replication supports near-zero downtime but requires schema preparation, sequence resets, monitoring, and platform-specific permissions. DNS records should have TTLs lowered well before cutover, custom domains and certificates should be configured in advance, and only one platform should accept database writes during the transition. After stability is confirmed, teams can raise TTLs, remove temporary replication, decommission the old environment after a defined safety period, and document lessons for future migrations.

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