Loki is a horizontally scalable, highly available, multi-tenant log aggregation system inspired by Prometheus. It is designed to be cost-effective and easy to operate, focusing on storing and querying logs from various sources. Loki does not index the content of the logs, but rather a set of labels for each log stream, making it efficient and fast for querying logs.
When using Loki, you might encounter the error message: 'failed to authenticate with storage backend'. This error indicates that Loki is unable to establish a connection with the configured storage backend due to authentication issues.
The error typically arises when Loki attempts to connect to the storage backend, such as AWS S3, Google Cloud Storage, or any other supported backend, but fails due to incorrect or missing authentication credentials. This can disrupt the log ingestion and querying process, leading to incomplete or missing log data.
To resolve the authentication error, follow these steps:
Ensure that the credentials used by Loki to access the storage backend are correct. Check the configuration file for any typos or incorrect values. For example, if using AWS S3, verify the aws_access_key_id and aws_secret_access_key in your Loki configuration.
Ensure that the IAM role or user associated with the credentials has the necessary permissions to access the storage backend. For AWS S3, the IAM policy should include permissions like s3:PutObject, s3:GetObject, and s3:ListBucket.
If the credentials are expired, generate new ones and update the Loki configuration accordingly. For AWS, you can create new access keys in the IAM Management Console.
For more information on configuring storage backends in Loki, refer to the official Loki Configuration Documentation. If you continue to experience issues, consider reaching out to the Grafana Community for support.
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