Grafana Mimir operator and user guideDeploying Grafana Mimir on KubernetesDeploying Grafana Mimir with Jsonnet and TankaConfiguring the Grafana Mimir ruler with Jsonnet

Configuring the Grafana Mimir ruler with Jsonnet

The ruler is an optional component and is therefore not deployed by default when using Jsonnet. For more information about the ruler, see Grafana Mimir ruler.

To enable it, add the following Jsonnet code to the _config section:

_config+:: {
  ruler_enabled: true
  ruler_client_type: '<type>',
}

The ruler_client_type option must be one of either local, azure, aws, or s3. For more information about the options available for storing ruler state, see Grafana Mimir ruler: State.

To get started, use the local client type for initial testing:

_config+:: {
  ruler_enabled: true
  ruler_client_type: 'local',
  ruler_local_directory: '/path/to/local/directory',
}

If you are using object storage, additional configuration options are required:

  • Amazon S3 (s3)

    • ruler_storage_bucket_name
    • aws_region
  • Google Cloud Storage (gcs)

    • ruler_storage_bucket_name
  • Azure (azure)

    • ruler_storage_bucket_name
    • ruler_storage_azure_account_name
    • ruler_storage_azure_account_key

Note: You need to manually provide the storage credentials for s3 and gcs by using additional command line arguments as necessary. For more information, see Grafana Mimir configuration parameters: ruler_storage.

Operational modes

The ruler has two operational modes: internal and remote. By default, the Jsonnet deploys the ruler by using the internal operational mode. For more information about these modes, see Operational modes.

To enable the remote operational mode, add the following code to the Jsonnet:

_config+:: {
  ruler_remote_evaluation_enabled: true
}

Note: To support the remote operational mode, a separate query path is deployed to evaluate rules that consist of three additional Kubernetes deployments:

  • ruler-query-frontend
  • ruler-query-scheduler
  • ruler-querier

Migrate to remote evaluation

To perform a zero downtime migration from internal to remote rule evaluation, follow these steps:

  1. Deploy the following changes to enable remote evaluation in migration mode. Doing so causes the three new and previously listed Kubernetes deployments to start. However, they will not reconfigure the ruler to use them just yet.

    _config+:: {
      ruler_remote_evaluation_enabled: true
      ruler_remote_evaluation_migration_enabled: true
    }
    
  2. Check that all of pods for the following deployments have successfully started before moving to the next step:

    • ruler-query-frontend
    • ruler-query-scheduler
    • ruler-querier
  3. Reconfigure the ruler pods to perform remote evaluation, by deploying the following changes:

    _config+:: {
      ruler_remote_evaluation_enabled: true
    }