Scale Up a High Availability Cluster

This guide walks through adding a node to an existing Ella Core high-availability cluster.

Prerequisites

• A running HA cluster deployed (see Deploy a High Availability Cluster).
• A prepared host with Ella Core installed per the Install guide with cluster.bind-address set in the configuration file.

Add a node

1. Open the Cluster page on any node in the cluster.
2. Click Add Node, click Mint Token, and copy the token.
3. Start Ella Core on the new host.
4. Open the new node's UI in a browser. Click on Join an existing cluster instead, paste the token, enter the cluster address of a node already in the cluster, and click Join.
5. On the Cluster page, verify the new node appears and is shown as Healthy.