Navigator --------- Navigator is a Kubernetes extension for managing common stateful services. It is fully compatible with clusters provisioned by Tarmak. To get started with Navigator, we suggest following the project's `quick-start guide `_. **Note: Storage Classes** However, please note that the example manifests reference a ``storageClass`` called ``default``. See here in the example manifests: - `Cassandra `_. - `Elasticsearch `_. Tarmak clusters do not have a ``storageClass`` with this name. Instead they have ``fast`` & ``slow`` (``fast`` is the default). Omitting the ``storageClass`` setting will cause Navigator to use the default, in our case the ``fast`` class. You may also choose to specify a different name for a storage class you defined after creating the cluster. Failure to update this will cause the scheduling of database pods to fail with the following error: ``pod has unbound PersistentVolumeClaims``. Pods will remain in ``Pending`` until the PVC can be bound. **Note: Node Sizes for Elasticsearch** The `Elasticsearch example `_ creates five pods each requesting 2Gi of RAM. You may wish to provision a dedicated instance pool for this.