Knowledge Discovery 26.2
Getting Started Guide

# Cluster Requirements

You must have an Ingress Controller, Storage Classes and Persistent Volumes, and metrics-server installed in your Kubernetes cluster before installing Knowledge Discovery.

## Ingress Controller

The cluster must provide an IngressController. For example on a minikube cluster, you can enable an NGINX controller and see the exposed address using `kubectl get ingress`.

## Storage Classes and Persistent Volumes

This system uses Storage Classes to provide Persistent Volumes(PV) as persistent storage for the DIH and Content components.

NOTE: uninstalling does not delete the PersistentVolumeClaims(PVCs). If you redeploy the Helm chart, it reuses any existing PV or PVCs.

values.yaml | default value | purpose
--- | --- | ---
contentStorageClass | idol-content-storage-class | Content component index and configuration
dihStorageClass | idol-dih-storage-class | DIH component data and configuration
backupArchiveStorageClass | idol-backup-archive-sc | mirror-mode Content backups. See `backupArchiveStorageClass` below

### backupArchiveStorageClass

In mirror-mode, the cluster must provide a storage class (named "idol-backup-archive-sc" by default) that can provision a PersistentVolume with `ReadWriteMany` access mode and `contentVolumeSize` space (see the "backup-archive-pvc" PersistentVolumeClaim). One Content engine is designated as the "primary" Content engine (running in the StatefulSet named "idol-child-content-primary" by default). This PersistentVolume is where the primary Content engine stores index commands and backups so that new Content mirrors can quickly initialize.

NOTE: While most volume providers support the `ReadWriteOnce` access mode required by the Content indexes, the `ReadWriteMany` mode has more limited support - see this table for an overview.

## metrics-server

The cluster must satisfy the requirements of the metrics-server deployment. For example, Kubelet certificates need to be signed by the cluster certificate authority.

Copyright 2026 Open Text
Version 26.2 | Last updated April 2026

Send documentation feedback

Close

Send documentation feedback

To send feedback using your default email client, open an email window.

Otherwise, send your feedback and the information below to MFI-swpdl.idoldocsfeedback@opentext.com.

We appreciate your feedback!

Product: Knowledge Discovery 26.2

Topic Title: Cluster Requirements