You can make changes to a MachineSet, such as adding labels, changing the instance type, or changing block storage.

If you need to scale a MachineSet without making other changes, see Manually scaling a MachineSet.

Modifying a MachineSet

To make changes to a MachineSet, edit the MachineSet YAML. Then, remove all machines associated with the MachineSet by deleting each machine 'or scaling down the MachineSet to 0 replicas. Then, scale the replicas back to the desired number. Changes you make to a MachineSet do not affect existing machines.

If you need to scale a MachineSet without making other changes, you do not need to delete the machines.

By default, the OKD router pods are deployed on workers. Because the router is required to access some cluster resources, including the web console, do not scale the worker MachineSet to 0 unless you first relocate the router pods.

Prerequisites
  • Install an OKD cluster and the oc command line.

  • Log in to oc as a user with cluster-admin permission.

Procedure
  1. Edit the MachineSet:

    $ oc edit machineset <machineset> -n openshift-machine-api
  2. Scale down the MachineSet to 0:

    $ oc scale --replicas=0 machineset <machineset> -n openshift-machine-api

    Or:

    $ oc edit machineset <machineset> -n openshift-machine-api

    Wait for the machines to be removed.

  3. Scale up the MachineSet as needed:

    $ oc scale --replicas=2 machineset <machineset> -n openshift-machine-api

    Or:

    $ oc edit machineset <machineset> -n openshift-machine-api

    Wait for the machines to start. The new Machines contain changes you made to the Machineset.