Important: This documentation is about an older version. It's relevant only to the release noted, many of the features and functions have been updated or replaced. Please view the current version.

Grafana Mimir Operator and user guide Secure Authentication and authorization
Open source

Grafana Mimir authentication and authorization

Grafana Mimir is a multi-tenant system where tenants can query metrics and alerts that include their tenant ID. The query takes the tenant ID from the X-Scope-OrgID parameter that exists in the HTTP header of each request, for example X-Scope-OrgID: <TENANT-ID>. You can federate queries across multiple tenants by using true in -tenant-federation.enabled=true. When you specify tenant IDs, separate them with a pipe (|) character in the X-Scope-OrgID header, as in the example X-Scope-OrgID: tenant-1|tenant-2|tenant-3.

To protect Grafana Mimir from accidental or malicious calls, you must add a layer of protection such as a reverse proxy that authenticates requests and injects the appropriate tenant ID into the X-Scope-OrgID header.

Configuring Prometheus remote write

For more information about Prometheus remote write configuration, refer to remote write.

With an authenticating reverse proxy

To use bearer authentication with a token stored in a file, the remote write configuration block includes the following parameters:

  type: Bearer
  credentials_file: <PATH TO BEARER TOKEN FILE>

To use basic authentication with a username and password stored in a file, the remote write configuration block includes the following parameters:


Without an authenticating reverse proxy

To configure the X-Scope-OrgID header directly, the remote write configuration block includes the following parameters:

  "X-Scope-OrgID": <TENANT ID>

Extracting tenant ID from Prometheus labels

In trusted environments where you want to split series on Prometheus labels, you can run cortex-tenant between a Prometheus server and Grafana Mimir.

Note: cortex-tenant is a third-party community project that is not maintained by Grafana Labs.

When proxying the timeseries to Grafana Mimir, you can configure cortex-tenant to use specified labels as the X-Scope-OrgID header.

To configure cortex-tenant, refer to configuration.

Disabling multi-tenancy

To disable multi-tenant functionality, pass the following argument to every Grafana Mimir component:


After you disable multi-tenancy, Grafana Mimir components internally set the tenant ID to the string anonymous for every request.

To set an alternative tenant ID, use the flag.

Note: Not all tenant IDs are valid. For more information about tenant ID restrictions, refer to About tenant IDs.