The following diagram illustrates a cutover strategy for live zero-downtime migration. In this method, the data is continuously replicated to the destination, and you perform most of the functional validation and integration testing at the destination while the application is still up and running:
In the replication process, the source on-premise database and target cloud database are always in sync. When all the integration and validation tests are completed successfully and the application is ready for cutover, you can take a blue-green approach to do the cutover. You will learn more about blue-green deployments in Chapter 12, DevOps and Solution Architecture Framework.
Initially, the application continues to run both on-premises and in the cloud, resulting in traffic being distributed between the two sides. You can increase traffic to cloud applications gradually until all the traffic is directed to the new...
