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Chapter 2. Manually scaling a MachineSet
You can add or remove an instance of a machine in a MachineSet.
If you need to modify aspects of a MachineSet outside of scaling, see Modifying a MachineSet.
Prerequisites
-
If you enabled the cluster-wide proxy and scale up workers not included in
networking.machineCIDRfrom the installation configuration, you must add the workers to the Proxy object’snoProxyfield to prevent connection issues.
This process is not applicable to clusters where you manually provisioned the machines yourself. You can use the advanced machine management and scaling capabilities only in clusters where the machine API is operational.
2.1. Scaling a MachineSet manually
If you must add or remove an instance of a machine in a MachineSet, you can manually scale the MachineSet.
Prerequisites
-
Install an OpenShift Container Platform cluster and the
occommand line. -
Log in to
ocas a user withcluster-adminpermission.
Procedure
View the MachineSets that are in the cluster:
$ oc get machinesets -n openshift-machine-api
The MachineSets are listed in the form of
<clusterid>-worker-<aws-region-az>.Scale the MachineSet:
$ oc scale --replicas=2 machineset <machineset> -n openshift-machine-api
Or:
$ oc edit machineset <machineset> -n openshift-machine-api
You can scale the MachineSet up or down. It takes several minutes for the new machines to be available.
ImportantBy default, the OpenShift Container Platform 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
0unless you first relocate the router pods.
