App Engine flexible environment Ruby: Cloud SQL Auth Proxy v2 for connections
Google Cloud's App Engine flexible environment for Ruby will adopt Cloud SQL Auth Proxy v2 as its built-in sidecar container for Cloud SQL connections. This update provides modern security patches and supports MySQL 8.4 and later versions. While mandatory from August 2026, users can apply the change immediately by restarting VMs or deploying a new application version. This impacts developers leveraging App Engine flexible environment with Ruby to interact with Cloud SQL instances.
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- App Engine flexible environment Ruby
Starting from August 2026, to provide modern security patches and support for MySQL 8.4 and later, the App Engine flexible environment uses Cloud SQL Auth Proxy v2 as the built-in sidecar container for connections to Cloud SQL. To use the latest Cloud SQL Auth Proxy container immediately, restart your VMs or deploy a new version of your application.
https://docs.cloud.google.com/release-notes#August_20_2026
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