Chapter 2. Manually scaling a machine set
You can add or remove an instance of a machine in a machine set.
If you need to modify aspects of a machine set outside of scaling, see Modifying a machine set.
If you enabled the cluster-wide proxy and scale up workers not included in
networking.machineNetwork.cidrfrom the installation configuration, you must add the workers to the Proxy object’s
noProxyfield to prevent connection issues.
This process is not applicable for clusters with manually provisioned machines. You can use the advanced machine management and scaling capabilities only in clusters where the Machine API is operational.
2.2. Scaling a machine set manually
To add or remove an instance of a machine in a machine set, you can manually scale the machine set.
This guidance is relevant to fully automated, installer-provisioned infrastructure installations. Customized, user-provisioned infrastructure installations do not have machine sets.
Install an OpenShift Container Platform cluster and the
Log in to
ocas a user with
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
Scale the machine set:
$ oc scale --replicas=2 machineset <machineset> -n openshift-machine-api
$ oc edit machineset <machineset> -n openshift-machine-api
You can scale the machine set up or down. It takes several minutes for the new machines to be available.
2.3. The machine set deletion policy
Oldest are the three supported deletion options. The default is
Random, meaning that random machines are chosen and deleted when scaling machine sets down. The deletion policy can be set according to the use case by modifying the particular machine set:
spec: deletePolicy: <delete_policy> replicas: <desired_replica_count>
Specific machines can also be prioritized for deletion by adding the annotation
machine.openshift.io/cluster-api-delete-machine to the machine of interest, regardless of the deletion policy.
By 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 machine set to
0 unless you first relocate the router pods.
Custom machine sets can be used for use cases requiring that services run on specific nodes and that those services are ignored by the controller when the worker machine sets are scaling down. This prevents service disruption.