
Moving 25+ live apps across Azure tenants
A cross-tenant Azure migration of 25+ live customer apps, 6 storage accounts and about 2 TB of files, with no data lost.
25+live customer apps moved, with no data lost
29,687files (about 2 TB) copied and verified
50+hostnames tested before and after the switch
Situation
- About 25 customer apps (websites, mobile-app backends and admin panels) ran in one Azure subscription.
- The subscription ran on credits that were about to run out. When they did, Azure would disable it and every site would go offline.
- The apps stored about 9,600 file links signed for the old storage, so a plain copy would have broken images and documents.
Task
- Move servers, databases, about 2 TB of files and every domain to a new subscription in a different Azure tenant.
- No data loss, minimal downtime and nothing customers would notice.
Action
- Snapshotted the server disks, copied them across tenants and rebuilt the server in the new subscription.
- Recreated 6 storage accounts with identical settings and copied every file into them.
- Re-signed about 9,600 stored file links and repointed every app's configuration to the new storage.
- Lowered DNS TTLs in advance, switched the domains and tested all 50+ hostnames before and after.
Result
- 25+ live customer apps moved, with no data lost
- 29,687 files (about 2 TB) copied and verified
- 50+ hostnames tested before and after the switch
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