Migration is the operation with the highest concentration of risks, and also the one where backup should never be skipped. Done right, it’s seamless for users; done wrong, it requires business recovery, time spent on troubleshooting, and may even result in loss of search engine indexing.
This page provides a specialized guide for Host Maintenance in relocation scenarios. For cloud-related migrations, see AWS Migration Services.
Common Scenarios
Changing Hosting Providers
Dissatisfaction with pricing, service, or response times. Risks are relatively low, but attention must be paid to renewal dates and data integrity.
IDC / Data Center Relocation
Data center lease expiration, line changes, or rack adjustments. Coordination between old and new facilities is required; most cases can achieve zero downtime.
Moving to/from Cloud
From IDC to cloud, or from cloud back to physical servers. Involves architectural changes (e.g., auto-scaling, high-availability groups have no direct equivalent on physical machines).
Business Consolidation
Merging multiple sites into a single environment. Requires handling conflicts in sessions, Cookies, caches, email sending, and scheduled tasks.
Changing Domain / Brand
Technically involves creating a new setup + 301 redirects. The challenge lies not in technology, but in content strategy and external link management.
Standard Procedure
- Audit Dependencies
Files, databases, scheduled tasks, crontab, external callbacks, IP whitelists, reverse proxy configurations, and mail sending sources. Missing any item will only become apparent after migration.
- Prepare Target Environment First
Build and configure the target environment completely first — environment versions, extensions, and settings must match or update to usable versions compared to the source. Do not dismantle the old before building the new.
- Full Simulation
Run a complete migration using real data, record the duration, and verify data integrity. Whether this step is performed determines whether cutover day goes smoothly or turns into a disaster.
- Incremental Sync & Parallel Operation
Perform a final incremental sync before cutover to minimize the downtime window.
- Cutover & Verification
Switch DNS resolution during off-peak hours; after switching, verify each component: homepage, admin panel, forms, login, search, scheduled tasks, and email sending.
- Monitoring & Wrap-up
Monitor for 24–72 hours to confirm stability before releasing old resources. Keep the old environment for at least 3–7 days to allow immediate rollback if issues arise.
Information Required in Advance
| Item | Why It Must Be Disclosed Early |
|---|---|
| Expiry date of current hosting | Many migration accidents occur when “the new environment isn’t ready, but the old one has expired,” leaving both offline. |
| Relationship between ICP filing and hosting provider | Changing providers typically requires an access change process with the original filing platform, which has procedural and time requirements. |
| Dependencies on fixed IPs | Third-party callbacks, payment whitelists, legacy clients, and CDN origin rules must all be updated synchronously. |
| Certificates and private keys | Must be deployed and verified in the new environment in advance; do not wait until cutover day to handle them. |
| Whether there are active write operations | Determines whether incremental sync is possible or if a full downtime window is mandatory. |
Frequently Asked Questions
Will migration affect search engine indexing?
Impact is controllable under standard procedures. The key is keeping URL paths unchanged, configuring complete 301 redirects, and submitting the sitemap to Search Console as soon as possible after switching. If the domain name also changes, the situation becomes much more complex and requires separate planning.
Is downtime mandatory?
Not necessarily. Through incremental sync + brief maintenance writes, or by switching via DNS/proxy layers, most sites can reduce downtime to just minutes or even zero. The approach depends on data volume and business type, and will be clearly specified during the solution phase.
How do we roll back if problems occur during migration?
The old environment is retained for 3–7 days; simply switch DNS resolution back to restore service. This is why we insist on “build new first, simulate, then cutover, and never delete the old environment” — every step leaves a way out.