Enabling the cluster autoscaler add-on in your cluster

You can enable the add-on from the console or the command line.

Because the cluster autoscaler doesn't recognize GPU labels, it can't scale up or down based on GPU consumption.

Enabling the cluster autoscaler add-on from the console

From the {{site.data.keyword.openshiftlong_notm}} cluster dashboard, select the cluster where you want to enable autoscaling.
In the Add-ons section, locate the Cluster Autoscaler add-on and click Install

Update the container-service plug-in to the most recent version.
```
ibmcloud update && ibmcloud plugin update container-service
```

Enable the cluster-autoscaler add-on by running the following command.

ibmcloud oc cluster addon enable cluster-autoscaler --cluster CLUSTER_NAME

Example output

Enabling add-on `cluster-autoscaler` for cluster <cluster_name>...
The add-on might take several minutes to deploy and become ready for use.
OK

Verify that the add-on is installed and Ready.

ibmcloud oc cluster addon ls --cluster <cluster_name>

Example output

NAME                 Version   Health State   Health Status   
cluster-autoscaler   1.0.1     normal         Addon Ready

No worker pools are configured for scaling after enabling the add-on. To set up autoscaling on your worker pools, edit the cluster autoscaler configmap.

The cluster autoscaler has two types of updates.

Patch updates: Patch updates are delivered automatically by IBM and don't contain any feature updates or changes in the supported add-on and cluster versions.
Release updates: Release updates contain new features for the cluster autoscaler or changes in the supported add-on or cluster versions. You must manually apply release updates to your cluster autoscaler add-on.

To update the cluster autoscaler add-on:

Check the version of the cluster autoscaler add-on that is deployed in your cluster. If an update is available, review the release notes for the latest add-on version.
```
ibmcloud oc cluster addon ls --cluster <cluster_name>
```
If you upgrade your cluster to a version that isn't supported by the cluster autoscaler add-on, your apps might experience downtime and your cluster might not scale.

Update the cluster autoscaler add-on.

ibmcloud oc cluster addon update cluster-autoscaler --version <version-to-update> --cluster <cluster_name>

Verify the add-on is successfully updated and Ready.

ibmcloud oc cluster addon ls --cluster <cluster_name>

Edit the autoscaler ConfigMap to stop scaling your working pools.
From the {{site.data.keyword.openshiftlong_notm}} cluster dashboard, select the cluster where you want to enable autoscaling.
Locate the Cluster Autoscaler add-on and click Uninstall

Disable the cluster-autoscaler add-on.

ibmcloud oc cluster addon disable cluster-autoscaler --cluster <cluster_name>

Verify that the add-on was removed.

ibmcloud oc cluster addon ls --cluster <cluster_name>