Overview
To create a migration in Database Migration Service, connectivity must be established between the source instance and the Cloud SQL destination instance. There are various methods supported. Choose the one that works best for the specific workload.| Networking method | Description | Advantages | Disadvantages |
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| IP allowlist |
This method works by configuring the source database server to accept connections from the outgoing IP of the Cloud SQL instance. If you choose this method, then Database Migration Service guides you through the setup process during the migration creation. |
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| Reverse SSH tunnel through cloud-hosted VM |
Establishes connectivity from the destination to the source through a secure reverse SSH tunnel. Requires a bastion host VM in the Google Cloud Platform project as well as a machine (for example, a laptop on the network) that has connectivity to the source. Database Migration Service collects the required information at migration creation time, and auto-generates the script for setting it all up. |
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| VPC-peering |
This method works by configuring the VPCs to communicate with one another. |
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Last updated 2022-12-02 UTC.