Thanos is an open-source project that provides highly available Prometheus setup with long term storage capabilities. It is designed to scale out Prometheus by providing a global query view, unlimited storage, and downsampling capabilities. Thanos Sidecar is a component that runs alongside Prometheus, enabling it to upload data to object storage and query data from it.
When using Thanos, you might encounter an error message stating: sidecar: failed to upload block
. This indicates that the Sidecar component is unable to upload a block of data to the configured object storage.
In your logs, you may see entries similar to:
level=error ts=2023-10-01T12:34:56.789Z caller=sidecar.go:123 msg="failed to upload block" err="upload failed: access denied"
The error typically arises due to network connectivity problems or insufficient permissions to access the object storage. The Sidecar component needs to communicate with the storage backend to upload blocks, and any disruption in this process can lead to the error.
To resolve the issue, follow these steps:
Ensure that the network path between the Thanos Sidecar and the object storage is open. You can use tools like ping
or curl
to test connectivity:
ping your-object-storage-endpoint.comcurl -v http://your-object-storage-endpoint.com
Ensure that the credentials used by the Sidecar have the necessary permissions to upload data. This typically involves checking the IAM roles or access keys:
s3:PutObject
and s3:PutObjectAcl
.Storage Object Creator
role.Double-check the configuration of the Sidecar to ensure that the storage endpoint and credentials are correctly set. Refer to the Thanos Sidecar documentation for configuration details.
By ensuring network connectivity and verifying permissions, you can resolve the sidecar: failed to upload block
error. Proper configuration and access rights are crucial for the seamless operation of Thanos Sidecar. For further assistance, consult the Thanos troubleshooting guide.
(Perfect for DevOps & SREs)
(Perfect for DevOps & SREs)