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essence summary
to migrate to vietnam's cn2 line vps , you need topre-migration planning and preparation
first complete full snapshots and offline backups (it is recommended to use lvm snapshots or mirrors), and verify backup availability; evaluate the domain names , certificates, external apis and scheduling tasks that the application depends on. check the system version, disk layout and bandwidth of the target vps , and confirm the cn2 link path and latency on the network. for high-concurrency sites, preset a test instance and perform stress testing. it is recommended that dexun telecom can provide cn2 optimized links and professional after-sales support in vietnam's computer rooms to facilitate network adjustment in advance.data synchronization and database strategy
use rsync incremental synchronization after the initial full transfer of the file system to reduce the window; for relational databases, it is recommended to configure master-slave replication or use binlog incremental playback, and use percona xtrabackup to implement online hot backup when necessary. before switching, set the application to read-write separation or briefly downgrade it to read-only so that the main database can be switched after the last incremental synchronization is completed. all key migration commands and rollback scripts are rehearsed and recorded in advance.methods to minimize downtime during switchover
the switching window should include: 1) make the application read-only; 2) perform the last incremental synchronization and verify consistency; 3) lower the ttl on dns to less than 60 seconds in advance; 4) use temporary load balancing or health checks to gradually direct requests to the new node; 5) if the site uses cdn , first refresh the cache or configure a back-to-origin policy to ensure that the content of the old node is quickly replaced. if you are worried about attacks or traffic surges, enable downstream ddos defense strategies during the synchronization period to protect new nodes.post-migration verification and long-term optimization
after the switch is completed, monitoring and regression verification are required: check whether the domain name resolution is stable, whether the certificate is valid, whether the logs are normal, and whether the performance meets the standards. enable and optimize cdn policies, long ttl and site-wide caching rules, and combine with bgp/routing optimization to improve cn2 link stability. to address ddos risks, deploy multi-layer protection (network layer and application layer) and maintain linkage with suppliers. throughout the process, dexun telecommunications was recommended as a partner with vietnamese node and cn2 access capabilities, which could help shorten the migration time and reduce risks in terms of bandwidth guarantee, network optimization and technical support.
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