Networking methods

Preview

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Overview

To create a migration in the Database Migration Service for MySQL, 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
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, the Database Migration Service for MySQL guides you through the setup process during the migration creation.	Easy to configure. Doesn't require any custom firewall configuration. Recommended for short-lived migration scenarios (POC or small database migrations).	Network traffic occurs over the public Internet. Less secure. Decreased performance.
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 GCP project as well as a machine (for example, a laptop on the network) that has connectivity to the source. The Database Migration Service for MySQL collects the required information at migration creation time, and auto-generates the script for setting it all up.	Easy to configure. Doesn't require any custom firewall configuration. Recommended for short-lived migration scenarios (POC or small database migrations).	Bastion VM is owned and managed by you, and may incur additional costs.
VPC-peering	This method works by configuring the VPCs to communicate with one another.	Native Google Cloud solution. Easy to configure. High bandwidth. Recommended for long-running or high-volume migrations.	Only applicable if both the source and destination databases are hosted in GCP.
VPN	This method works by configuring an IPSec VPN tunnel, and connecting the source network and Google Cloud VPC through a secure connection over the public Internet. Uses Google Cloud VPN or any VPN solution that is set up for the internal network.	Robust and scalable connectivity solution. Medium-high bandwidth. Security built-in. Offered as a native GCP solution or from other 3rd parties.	Additional cost. Non-trivial configuration (unless already in-place).
Cloud Interconnect	Uses a highly available, low latency connection between the on-premises network and Google Cloud.	Highest bandwidth, ideal for long-running high-volume migrations.	Additional cost. Connection is not secure by default. Non-trivial configuration (unless already in-place).