App Engine app must integrate with an on‑premises database that must not be reachable over the public Internet. What should you do?
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Correct answer: Deploy to App Engine flexible environment and use Cloud VPN to access the on‑premises database..
Why this is the answer
The App Engine flexible environment runs your application in Docker containers on Compute Engine virtual machines, allowing it to reside within a Google Cloud VPC network. This enables the use of Cloud VPN to establish a secure, private connection to your on-premises network and database. The App Engine standard environment is a sandboxed environment and cannot directly connect to a VPC network via Cloud VPN. App Engine firewall rules control inbound traffic to your App Engine application, not outbound connections to external resources like an on-premises database. Therefore, using the flexible environment with Cloud VPN is the correct approach for secure private connectivity.
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