Is it possible to use Google App Engine with Google Cloud VPN?

Question

The documentation from Google is not really clear about it. Here ( https://cloud.google.com/compute/docs/vpn/overview ) it says

Google Cloud VPN secu

Answer 1

Google Cloud VPN securely connects your existing network to your Google Cloud Platform (GCP) network through an IPsec VPN connection. Therefore, only resources that are connected to GCP networks can communicate through Cloud VPN tunnels.

App Engine Flexible Environment is based on Google Compute Engine and consequently can connect to your remote network via Cloud VPNs. As described in this article, you can specify network settings in your app.yaml configuration file of your GAE Flexible application.

Answer 2

Google App Engine standard CAN'T use VPN directly, however the new Flexible Google App Engine (now officially released, no longer in beta) CAN use it directly. Just set up google cloud VPN and your network from the console and make sure to include the network in your app.yaml file.

Flexible App Engine is be the easiest way for new applications to utilize VPN connections since there won't be any migration headaches.

For a standard app engine application that can't be ported over to flexible for whatever reason, you CAN still use a VPN connection - however, it requires a service to be running on flexible app engine (or compute engine), and your app will need to interface with it somehow. This may be the simplest method, as migrating from standard to flexible is not the simplest of tasks. I know - I've done it.