Chapter 3. Manually scaling a machine set

Procedure

1. View the machine sets that are in the cluster:

   $ oc get machinesets -n openshift-machine-api

   The machine sets are listed in the form of

   <clusterid>-worker-<aws-region-az>

   .

2. View the machines that are in the cluster:

   $ oc get machine -n openshift-machine-api

3. Set the annotation on the machine that you want to delete:

   $ oc annotate machine/<machine_name> -n openshift-machine-api machine.openshift.io/cluster-api-delete-machine="true"

4. Cordon and drain the node that you want to delete:

   $ oc adm cordon <node_name>
   $ oc adm drain <node_name>

5. Scale the machine set:

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

   Or:

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

   Tip

   You can alternatively apply the following YAML to scale the machine set:

   apiVersion: machine.openshift.io/v1beta1
   kind: MachineSet
   metadata:
     name: <machineset>
     namespace: openshift-machine-api
   spec:
     replicas: 2

   You can scale the machine set up or down. It takes several minutes for the new machines to be available.