Knowledge Discovery 25.4
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 2025 Open Text
Version 25.4 | Last updated October 2025

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Product: Knowledge Discovery 25.4

Topic Title: Cluster Requirements