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Perform backend management with kubectl

Contributors netapp-aruldeepa juliantap netapp-dbagwell netapp-mwallis
PDFs

Learn about how to perform backend management operations by using kubectl.

Delete a backend

By deleting a TridentBackendConfig, you instruct Trident to delete/retain backends (based on deletionPolicy). To delete a backend, ensure that deletionPolicy is set to delete. To delete just the TridentBackendConfig, ensure that deletionPolicy is set to retain. This ensures the backend is still present and can be managed by using tridentctl.

Run the following command:

kubectl delete tbc <tbc-name> -n trident

Trident does not delete the Kubernetes Secrets that were in use by TridentBackendConfig. The Kubernetes user is responsible for cleaning up secrets. Care must be taken when deleting secrets. You should delete secrets only if they are not in use by the backends.

View the existing backends

Run the following command:

kubectl get tbc -n trident

You can also run tridentctl get backend -n trident or tridentctl get backend -o yaml -n trident to obtain a list of all backends that exist. This list will also include backends that were created with tridentctl.

Update a backend

There can be multiple reasons to update a backend:

  • Credentials to the storage system have changed. To update credentials, the Kubernetes Secret that is used in the TridentBackendConfig object must be updated. Trident will automatically update the backend with the latest credentials provided. Run the following command to update the Kubernetes Secret:

    kubectl apply -f <updated-secret-file.yaml> -n trident

  • Parameters (such as the name of the ONTAP SVM being used) need to be updated.

    • You can update TridentBackendConfig objects directly through Kubernetes using the following command:

      kubectl apply -f <updated-backend-file.yaml>

    • Alternatively, you can make changes to the existing TridentBackendConfig CR using the following command:

      kubectl edit tbc <tbc-name> -n trident
Note

  • If a backend update fails, the backend continues to remain in its last known configuration. You can view the logs to determine the cause by running kubectl get tbc <tbc-name> -o yaml -n trident or kubectl describe tbc <tbc-name> -n trident.

  • After you identify and correct the problem with the configuration file, you can re-run the update command.