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Showing content from https://cloud.google.com/database-migration/docs/postgres/networking-methods below:

Networking methods | Database Migration Service

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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.

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.

• 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.

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.

• Easy to configure.
• Doesn't require any custom firewall configuration.
• Recommended for short-lived migration scenarios (POC or small database migrations).

• The bastion VM is owned and managed by you, and may incur additional costs.

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.

• Applicable if both the source and destination databases are hosted in Google Cloud, or if the source is connected to the destination VPC using a VPN (cloud-hosted or on-premises) or Cloud Interconnect.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-07-09 UTC.

[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-09 UTC."],[[["Database Migration Service requires establishing connectivity between the source database and the Cloud SQL destination instance for successful migration."],["The IP allowlist method involves configuring the source database to accept connections from the Cloud SQL instance's outgoing IP address, and is recommended for short-lived migrations."],["Reverse-SSH tunnel via cloud hosted VM method creates a secure connection from the destination to the source, requiring a bastion host VM and is also preferred for short lived migrations."],["VPC peering involves configuring VPCs to communicate with each other, and is ideal for long-running or high-volume migrations, but works if both databases are hosted in google cloud or are connected to the same VPC."]]],[]]

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