Database Migration Service (DMS) simplifies the migration of MySQL and PostgreSQL databases from on-premises, Google Compute Engine, and other clouds to Cloud SQL. It is serverless, easy to set up, and available at no additional cost. It replicates data continuously for minimal downtime migrations.

Here’s how it works:

• Provide your data source details—type of database engine, such as MySQL, PostgreSQL, Amazon RDS, or others. Pick one time or continuous replication for minimal downtime.
• Create a Cloud SQL instance as your destination.
• DMS makes connectivity to the source instance easy by providing multiple options. You can allow-list an IP address, create a reverse SSH tunnel via a cloud-hosted virtual machine, or set up VPC peering.
• Finally, test and promote the migrated instance to the primary Cloud SQL in stance