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Asked: 2024-09-21T17:02:07+05:30 In:

I’m experiencing issues with Bazel’s remote caching when trying to utilize S3 for storage. Specifically, I’m encountering a 403 Forbidden error when attempting to access the remote cache. Has anyone faced a similar problem, and could you share potential solutions or troubleshooting steps to resolve this issue?

Hey everyone!

I hope you’re all doing well. I’ve been working with Bazel’s remote caching feature and trying to set up S3 for storage, but I keep running into a 403 Forbidden error whenever I try to access the remote cache. It’s really holding me back from making progress.

Has anyone else experienced this issue? I’d love to hear if you found any solutions or troubleshooting steps that helped resolve it. Any tips or insights would be greatly appreciated! Thanks in advance for your help!

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    3 Answers


    1. Getting a 403 Forbidden error when accessing S3 for Bazel’s remote caching can be frustrating, but it usually relates to permission issues. First, ensure that the AWS IAM role or user associated with your Bazel build has the correct permissions set up. You need to grant permissions like `s3:GetObject`, `s3:PutObject`, and possibly `s3:ListBucket` for the specific bucket you are using. Double-check the bucket policy and ensure that it allows access to the IAM role or user you’ve configured in Bazel’s settings. You may also want to verify that you are specifying the correct region where your S3 bucket is hosted.

      If the permissions seem correct and you’re still seeing this error, it may help to enable logging on your S3 bucket to capture more details about the access attempts. This can provide insights on whether the requests are reaching the bucket and if any additional conditions are being violated. Additionally, consider testing with the AWS CLI to see if you can manually upload and download files to/from the S3 bucket using the same credentials. This can help isolate whether the issue lies within the Bazel configuration or if it’s a broader access issue with the S3 bucket itself.




    2. Bazel Remote Caching Help

      Re: Bazel Remote Caching 403 Forbidden Error

      Hi there!

      I’m also new to Bazel and the remote caching setup, so I totally get how frustrating this must be! I haven’t set up S3 myself, but here are a few things that might help you troubleshoot the 403 Forbidden error:

      • Double-check your AWS S3 bucket permissions. Make sure that the user or role that Bazel is using has the right permissions to access the S3 bucket.
      • Look at your bucket policy. It should allow the necessary actions like s3:GetObject and s3:PutObject for the resources you’re trying to use.
      • Make sure you’re using the correct S3 URL in your Bazel configuration. Sometimes, a small typo can cause access issues.
      • If you have any IP restrictions on your S3 bucket, ensure that the IPs being used to connect to the remote cache are allowed.

      I hope one of these suggestions helps! If you find a solution, please share it with us. Good luck!




    3. Bazel Remote Caching Issue

      Re: Bazel Remote Caching with S3

      Hey there!

      I can definitely relate to your struggle with the 403 Forbidden error when setting up remote caching with S3. I’ve encountered similar issues in the past. Here are a few things you might want to check:

      • S3 Bucket Policy: Ensure that your bucket policy allows the necessary permissions for Bazel. You may need to grant permissions for both the action and the resources involved.
      • AWS IAM Role/Policy: Check the IAM role or user that Bazel is using to access S3. Make sure it has the proper policies attached that allow it to `GetObject`, `PutObject`, and `ListBucket` actions.
      • Endpoint Configuration: If you’re using S3 in a specific region, double-check that your endpoint is set correctly in your Bazel configuration.
      • Correct Configuration in Bazel: Review your Bazel configuration file (like `bazelrc`) to ensure that all settings for remote caching are correct, especially the credentials and Bucket name.

      If you’ve gone through these and are still running into issues, you might want to enable logging to get more detailed error messages that can point you in the right direction.

      Hopefully, this helps you troubleshoot the issue! Let us know how it goes.

      Best of luck!


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