How To Delete The Day-One Machine Pool on ROSA/OSD Clusters

Solution Verified - Updated -

Environment

  • Red Hat OpenShift Service on AWS
  • OpenShift Dedicated
    • non-CCS

Issue

  • Delete the default OSD/ROSA Machine Pool
  • Change the machine size of the default Machine Pool

Resolution

Starting from September 7th, 2023, customers will be able to replace the day-one worker machine pool for ROSA and OSD non-CCS clusters on AWS. With this new feature, customers are enabled to perform the removal of the day-one MachinePool in a self-serve fashion from either OCM UI or via ROSA CLI (v1.2.26 or newer required).

Please find the steps to replace the day-one machine pool:

Pre-Requisites

  1. Deleting the day-one machine pool will only be possible after creating at least an additional machine pool without any taints and with at least two instances (in case of single-AZ cluster) or 3 instances (in case of multi-AZ cluster).
  2. Using the case-sensitive ‘Default’ name for a new machine pool is not possible since it is a reserved name used with ROSA CLI 1.2.25 and earlier versions.
  3. The new machine pool created cannot be set to Min Count: 0.

ROSA CLI

  1. List the existing machine pools:
$ rosa list machinepools -c awesome-cluster
ID      AUTOSCALING  REPLICAS  INSTANCE TYPE  LABELS    TAINTS    AVAILABILITY ZONES    SUBNETS    SPOT INSTANCES  DISK SIZE  
worker  No           3         m5.xlarge                          us-west-2a                       No              300 GiB
  1. Create a new machine pool with the instance type of your choice:
$ rosa create machinepool -c awesome-cluster --name new-machine-pool --replicas 2 --instance-type m5.2xlarge
I: Fetching instance types
I: Machine pool 'new-machine-pool' created successfully on cluster 'awesome-cluster'
I: To view all machine pools, run 'rosa list machinepools -c awesome-cluster'
  1. Ensure the new machine pool has been created successfully and that the nodes are ready;
  2. Move your workloads to the new nodes;
  3. Delete the original worker machine pool:
$ rosa delete machinepool -c awesome-cluster worker
? Are you sure you want to delete machine pool 'worker' on cluster 'awesome-cluster'? Yes
I: Successfully deleted machine pool 'worker' from cluster 'awesome-cluster'

$ rosa list machinepools -c awesome-cluster
ID                AUTOSCALING  REPLICAS  INSTANCE TYPE  LABELS    TAINTS    AVAILABILITY ZONES    SUBNETS    SPOT INSTANCES  DISK SIZE  
new-machine-pool  No           2         m5.2xlarge                         us-west-2a                       No              300 GiB

OCM UI

  1. Go go OCM, click on your cluster and go to the Machine Pools tab and click on Add machine pool:
  2. Fill the form accordingly and click on Add machine pool:
  3. Ensure the new machine pool has been created successfully and that the nodes are ready;
  4. Move your workloads to the new nodes;
  5. Back on the Machine Pools tab, click on the ellipses on the worker line and click on Delete:
  6. Click on Delete when asked to confirm the operation:

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