OpenShift Container Platform

Scale up and down workloads in a hosted cluster

To scale up and down the workloads in your hosted cluster, you can use the ScaleUpAndScaleDown behavior. The compute nodes scale up when you add workloads and scale down when you delete workloads.

Prerequisites

You have created the HostedCluster and NodePool resources.

Procedure

Enable cluster autoscaling for your hosted cluster by setting the scaling behavior to ScaleUpAndScaleDown. Run the following command:

$ oc patch -n <hosted_cluster_namespace> \
  hostedcluster <hosted_cluster_name> \
  --type=merge \
  --patch='{"spec": {"autoscaling": {"scaling": "ScaleUpAndScaleDown", "maxPodGracePeriod": 60, "scaleDown": {"utilizationThresholdPercent": 50}}}}'

Remove the spec.replicas field from the NodePool resource to allow cluster autoscaler to manage the node count. Run the following command:

$ oc patch -n <hosted_cluster_namespace> \
  nodepool <node_pool_name> \
  --type=json  \
  --patch='[{"op": "remove", "path": "/spec/replicas"}]'

Enable cluster autoscaling to configure the minimum and maximum node counts for your node pools. Run the following command:

$ oc patch -n <hosted_cluster_namespace> \
  nodepool <nodepool_name> \
  --type=merge --patch='{"spec": {"autoScaling": {"max": 3, "min": 1}}}'

Verification

To verify that all compute nodes are in the Ready status, run the following command:
```
$ oc --kubeconfig <hosted_cluster_name>.kubeconfig get nodes
```