Failed to Create Ephemeral Certificate for the Cloud SQL Instance

The error “failed to create ephemeral certificate for the Cloud SQL instance” typically occurs when your application or tool attempts to connect to a Cloud SQL instance and cannot generate the temporary SSL certificate required for secure access. This certificate is essential for Cloud SQL client connections, especially when using the Cloud SQL Auth Proxy or Application Default Credentials (ADC).

Here’s a step-by-step guide to identify and resolve this issue:

Step 1: Verify IAM Permissions

– Ensure the service account or user you’re using has the necessary permissions to connect to Cloud SQL.
– Go to the Google Cloud Console IAM page.
– Check that the account has the Cloud SQL Client role (roles/cloudsql.client).
– If missing, click Edit, then Add another role, and select Cloud SQL Client.

Step 2: Ensure Cloud SQL Admin API Is Enabled

– The Cloud SQL Admin API is required to manage ephemeral certificates.
– Visit the API Library.
– Ensure the Cloud SQL Admin API is enabled for your project

Step 3: Authenticate with Google Cloud Properly

The tool or environment must be authenticated using a method that provides access tokens:
For local development:

– Run the following command to authenticate with application default credentials:
– gcloud auth application-default login
– For deployed environments:
– Ensure your service account key is available and set:
- export GOOGLE_APPLICATION_CREDENTIALS="path/to/service-account-key.json"

Step 4: Use the Cloud SQL Auth Proxy (Recommended)

If you’re not already using it, the Cloud SQL Auth Proxy simplifies and secures connection setup.
– Download the Cloud SQL Auth Proxy.
– Run the proxy with your instance connection name:
./cloud-sql-proxy \
--credentials-file=path/to/service-account-key.json

This ensures the ephemeral certificate is handled securely.

Step 5: Check Instance and Network Configuration

– Make sure the Cloud SQL instance is running.
– If using a public IP, your IP must be authorized in the SQL instance settings.
– If using a private IP, ensure your environment is in the same VPC network or has proper VPC peering.

Step 6: Verify Certificate Creation via Logs

You can check logs in the Cloud Logging console:

– Go to Logs Explorer.
– Filter by resource.type=”cloudsql_database” and search for certificate or connection errors.

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