Node Pools

A NodePool is a scalable set of worker nodes associated with a HostedCluster. NodePool machine architectures remain consistent within a specific pool and are independent of the underlying machine architecture of the control plane.

Note

Please ensure you modify the appropriate fields to align with your laboratory environment.

Warning

Before a day-1 patch, the release image set in the HostedCluster should use the digest rather than the tag. (e.g quay.io/openshift-release-dev/ocp-release@sha256:e3ba11bd1e5e8ea5a0b36a75791c90f29afb0fdbe4125be4e48f69c76a5c47a0)

This is how one looks like:

apiVersion: hypershift.openshift.io/v1beta1
kind: NodePool
metadata:
  creationTimestamp: null
  name: hosted-dual
  namespace: clusters
spec:
  arch: amd64
  clusterName: hosted-dual
  management:
    autoRepair: false
    upgradeType: InPlace
  nodeDrainTimeout: 0s
  nodeVolumeDetachTimeout: 0s
  platform:
    type: Agent
  release:
    image: registry.hypershiftbm.lab:5000/openshift/release-images:4.14.0-0.nightly-2023-08-29-102237
  replicas: 0
status:
  replicas: 0

Details:

  • All the nodes included in this NodePool will be based on the Openshift version 4.14.0-0.nightly-2023-08-29-102237.
  • The Upgrade type is set to InPlace, indicating that the same bare-metal node will be reused during an upgrade.
  • Autorepair is set to false because the node will not be recreated when it disappears.
  • Replicas are set to 0 because we intend to scale them when needed.

You can find more information about NodePool in the NodePool documentation.

To deploy this object, simply follow the same procedure as before:

oc apply -f 02-nodepool.yaml

And this is how the NodePool looks like at this point:

NAMESPACE   NAME          CLUSTER   DESIRED NODES   CURRENT NODES   AUTOSCALING   AUTOREPAIR   VERSION                              UPDATINGVERSION   UPDATINGCONFIG   MESSAGE
clusters    hosted-dual   hosted    0                               False         False        4.14.0-0.nightly-2023-08-29-102237

Important

Keep the nodepool replicas to 0 until all the steps are in place.