Ceph Authentication failures when accessing the RADOS Gateway.

What is Ceph Authentication failures when accessing the RADOS Gateway.

Understanding Ceph and RADOS Gateway

Ceph is a highly scalable distributed storage system that provides object, block, and file storage in a unified system. The RADOS Gateway (RGW) is a component of Ceph that provides an HTTP REST interface to the RADOS object store, making it compatible with Amazon S3 and OpenStack Swift APIs.

Identifying the Symptom: RGW_AUTH_FAILURE

When accessing the RADOS Gateway, you might encounter an RGW_AUTH_FAILURE error. This typically manifests as failed authentication attempts, preventing access to the object storage via the gateway.

Understanding the Issue: RGW_AUTH_FAILURE

The RGW_AUTH_FAILURE error indicates that the authentication process has failed. This can occur due to several reasons, most commonly incorrect credentials or misconfigured settings in either the client or the RADOS Gateway itself.

Common Causes

Incorrect access key or secret key. Misconfigured user permissions or policies. Network issues preventing proper communication.

Steps to Fix the RGW_AUTH_FAILURE Issue

To resolve the RGW_AUTH_FAILURE error, follow these steps:

Step 1: Verify Credentials

Ensure that the access key and secret key being used are correct. You can verify the credentials by checking the user configuration in the Ceph dashboard or using the Ceph CLI:

ceph auth list

Ensure that the keys match those configured in your client application.

Step 2: Check User Configuration

Verify that the user has the necessary permissions to access the resources. You can list the users and their capabilities using:

radosgw-admin user info --uid=

Ensure that the user has the appropriate permissions and policies set.

Step 3: Review Configuration Files

Check the configuration files for any discrepancies. The ceph.conf file and the RGW configuration should be reviewed to ensure they are correctly set up. Pay particular attention to the sections related to authentication and access control.

Step 4: Network and Firewall Settings

Ensure that there are no network issues or firewall settings blocking access to the RADOS Gateway. Verify that the necessary ports are open and that there is no network segmentation preventing communication.

Additional Resources

For more detailed information on configuring and troubleshooting Ceph and the RADOS Gateway, refer to the official Ceph Documentation and the RGW Troubleshooting Guide.