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Discover a straightforward solution to access Google Cloud Storage from Cloud Run, including important environment variable settings and explanations.
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How to Access Google Cloud Storage from Cloud Run: A Simple Guide

If you're running a PHP project on Google Cloud Run and need easy access to Google Cloud Storage (GCS) for file handling, you might run into some hurdles. This guide addresses a common issue faced when attempting to access GCS through Cloud Run and provides a clear solution.

The Problem

You may encounter an error similar to this when trying to access Google Cloud Storage from your Cloud Run service:

[[See Video to Reveal this Text or Code Snippet]]

This error indicates that cURL is attempting to use a proxy to reach GCS but is unable to resolve the proxy settings. You mentioned that you've not configured any proxy settings but are utilizing a VPC connector configured to allow requests only to private IPs. This can lead to confusion as to why cURL would be trying to connect through a proxy.

Understanding the Issue

cURL and Proxies:

cURL is a command-line tool and library for transferring data with URLs. Often, when the error indicates "Could not resolve proxy", it suggests that cURL couldn't find the required proxy configuration.

VPC Connector:

A VPC connector allows your Cloud Run service to connect to resources in a Virtual Private Cloud (VPC). If it's configured to only handle private IP requests, that might be conflicting with the way you're trying to access GCS.

Symfony Framework:

Your project uses Symfony 5 and the flysystem library with the google-cloud-storage adapter. These tools should ideally handle the connection to GCS directly without needing complex configurations.

The Solution

After troubleshooting, the solution to this problem was discovered through the setting of environment variables. Here’s what you need to do:

Steps to Resolve the Issue

Set Appropriate Environment Variables:
You need to set the following environment variables in your Cloud Run service configuration:

[[See Video to Reveal this Text or Code Snippet]]

By setting these to empty strings, you’re indicating to cURL not to use any proxy settings when making requests to GCS.

Deploy Your Service:

After updating your environment variables, redeploy your Cloud Run service. Make sure the settings are correctly reflected in your Cloud Run environment.

Test Your Connection:

Once deployed, test your application to confirm that it can now access GCS without encountering proxy errors.

Conclusion

Accessing Google Cloud Storage from your Cloud Run services can initially seem daunting, especially with proxy-related errors hindering your progress. However, with a few key environment variable adjustments, you can successfully enable communication between your Cloud Run instance and GCS. Remember:

Ensure your environment variables are correctly set.

Monitor your service for any further connection issues.

Feel free to reach out if you encounter further challenges while working with Cloud Run and GCS—happy coding!