cluster-scaling-resize.md

copyright	years 2025, 2026
lastupdated	2026-07-30
keywords	kubernetes, rebalance, resize, node scaling, ca, autoscaler, openshift
subcollection	openshift

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Rebalancing or resizing autoscaled worker pools

{: #ca_update_worker_node_pool}

Before you can rebalance or resize your worker pool, you must remove the worker pool from the autoscaler configmap to disable autoscaling.

1. Edit iks-ca-configmap and disable the worker pool that you want to resize or rebalance by removing it from the workerPoolsConfig.json section.

   oc edit cm -n kube-system iks-ca-configmap

   {: pre}

   Example output

   apiVersion: v1
   data:
     workerPoolsConfig.json: |
       [
        {"name": "","minSize": 1,"maxSize": 2,"enabled":false}
       ]
   kind: ConfigMap

   {: screen}

2. Save the iks-ca-configmap.

3. Resize or rebalance your worker pool.

4. Optional Update your VPC worker nodes.

5. Add the worker pool to the iks-ca-configmap.

   oc edit cm -n kube-system iks-ca-configmap

   {: pre}

   Example

   apiVersion: v1
   data:
     workerPoolsConfig.json: |
       [
        {"name": "<worker_pool>","minSize": 1,"maxSize": 2,"enabled":false}
       ]
   kind: ConfigMap

   {: screen}