I have a custom Postgres instance running on a GCE VM. I am not using CloudSQL. I'd like to use the functionality provided by the cloudsql-proxy, but when I specify my custom instance the proxy fails.
googleapi: Error 404: The Cloud SQL instance does not exist., instanceDoesNotExist
It appears that only CloudSQL instances work and I don't understand the limitation. It seems like the proxy should work on any VM with port 5432 open.
Cloud SQL Proxy can only be used with Cloud SQL instances. In the documentation About the Cloud SQL Proxy there is no mention about using it for custom databases inside GCE. As it is stated in the documentation:
The Cloud SQL Proxy provides secure access to your Cloud SQL Second Generation instances without having to whitelist IP addresses or configure SSL.
However, I found some documentation about Access control overview where you can find an alternative to it.
