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Azure blob storage permissions and management

Tempo requires the following configuration to authenticate to and access Azure blob storage:

  • Storage Account name specified in the configuration file as storage_account_name or in the environment variable AZURE_STORAGE_ACCOUNT
  • Credentials for accessing the Storage Account; can be one of the following
    • Storage Account access key specified in the configuration file as storage_account_key or in the environment variable AZURE_STORAGE_KEY
    • An Azure Managed Identity; either system or user assigned. To use Azure Managed Identities, you’ll need to set use_managed_identity to true in the configuration file or set user_assigned_id to the client ID for the managed identity you’d like to use.
      • For a system-assigned managed identity, no additional configuration is required.
      • For a user-assigned managed identity, you’ll need to set user_assigned_id to the client ID for the managed identity in the configuration file.
    • Via Azure Workload Identity. To use Azure Workload Identity, you’ll need to enable Azure Workload Identity on your cluster, add the required label and annotation to the service account and the required pod label.

Sample configuration

This sample configuration shows how to set up Azure blob storage using Helm charts and an access key from Kubernetes secrets.

yaml
tempo:
  storage:
    trace:
      backend: azure
      azure:
        container_name: container-name
        storage_account_name: storage-account-name
        storage_account_key: ${STORAGE_ACCOUNT_ACCESS_KEY}

  extraArgs:
    config.expand-env: true
  extraEnv:
    - name: STORAGE_ACCOUNT_ACCESS_KEY
      valueFrom:
        secretKeyRef:
          name: secret-name
          key: STORAGE_ACCOUNT_ACCESS_KEY

Azure blocklist polling

If you are hosting Tempo on Azure, two values may need to be updated to ensure consistent successful blocklist polling. If you are experiencing this issue, try setting blocklist_poll_tenant_index_builders to 1.

Additionally, if you are seeing DNS failures like the ones below, try increasing blocklist_poll_jitter_ms. Discussion here.

reading storage container: Head "https://tempoe**************.blob.core.windows.net/tempo/single-tenant/d8aafc48-5796-4221-ac0b-58e001d18515/meta.compacted.json?timeout=61": dial tcp: lookup tempoe**************.blob.core.windows.net on 10.0.0.10:53: dial udp 10.0.0.10:53: operation was canceled

Your final configuration may look something like:

  storage:
    trace:
      blocklist_poll_tenant_index_builders: 1
      blocklist_poll_jitter_ms: 500

(Optional) Storage Account management policy for cleaning up the storage container

The following Storage Account management policy shows an example of cleaning up files from the container after they have been deleted for a period of time.

json
{
  "id": "/subscriptions/00000000-0000-0000000000000000000000/resourceGroups/resourceGroupName/providers/Microsoft.Storage/storageAccounts/accountName/managementPolicies/default",
  "lastModifiedTime": "2021-11-30T19:19:54.855455+00:00",
  "name": "DefaultManagementPolicy",
  "policy": {
    "rules": [
      {
        "definition": {
          "actions": {
            "baseBlob": {
              "delete": {
                "daysAfterLastAccessTimeGreaterThan": null,
                "daysAfterModificationGreaterThan": 60.0
              },
              "enableAutoTierToHotFromCool": null,
              "tierToArchive": null,
              "tierToCool": null
            },
            "snapshot": null,
            "version": null
          },
          "filters": {
            "blobIndexMatch": null,
            "blobTypes": [
              "blockBlob"
            ],
            "prefixMatch": [
              "tempo-data"
            ]
          }
        },
        "enabled": true,
        "name": "TempoBlobRetention",
        "type": "Lifecycle"
      },
      {
        "definition": {
          "actions": {
            "baseBlob": null,
            "snapshot": null,
            "version": {
              "delete": {
                "daysAfterCreationGreaterThan": 7.0
              },
              "tierToArchive": null,
              "tierToCool": null
            }
          },
          "filters": {
            "blobIndexMatch": null,
            "blobTypes": [
              "blockBlob"
            ],
            "prefixMatch": []
          }
        },
        "enabled": true,
        "name": "VersionRetention",
        "type": "Lifecycle"
      }
    ]
  },
  "resourceGroup": "resource-group-name",
  "type": "Microsoft.Storage/storageAccounts/managementPolicies"
}