GAE flex Connection String to first generation CloudSQL

Question

I have a GAE flex application that uses sqlalchemy/mysql. I also have a Google CloadSQL mysql instance First Generation. Is it possible to connect a GAE flex environment to a First Generation CloudSQL instance without connecting as an external app (and thus needing to whitelist the world). The Google documentation states to use /cloudsql/<INSTANCE_CONNECTION_NAME> as the connection string. I've tried many different flavors, but I'm still unsuccessful.

Examples: mysql+pymysql://user:password@/cloudsql/<INSTANCE_CONNECTION_NAME> mysql+pymysql:///cloudsql/<INSTANCE_CONNECTION_NAME>

Is there a different driver that's needed?

Thanks

Answer 1

You are correct, it is not possible to connect GAE flex to CloudSQL 1st generation.

The alternatives are:

a. Use App Engine Standard App instead.

b. Migrate the First Generation instance to a Second Generation one

Answer 2

After searching the various Google documents, IRC channels and Slack forums, i've come to the conclusion that CloudSQL Gen 1 isn't support on GAE:flex :(