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Control plane machine set configuration - Managing control plane machines | Machine management | OKD 4.15
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Control plane machine set configuration

This example YAML snippet shows the base structure for a control plane machine set custom resource (CR).

Sample YAML for a control plane machine set custom resource

The base of the ControlPlaneMachineSet CR is structured the same way for all platforms.

Sample ControlPlaneMachineSet CR YAML file
apiVersion: machine.openshift.io/v1
kind: ControlPlaneMachineSet
metadata:
  name: cluster (1)
  namespace: openshift-machine-api
spec:
  replicas: 3 (2)
  selector:
    matchLabels:
      machine.openshift.io/cluster-api-cluster: <cluster_id> (3)
      machine.openshift.io/cluster-api-machine-role: master
      machine.openshift.io/cluster-api-machine-type: master
  state: Active (4)
  strategy:
    type: RollingUpdate (5)
  template:
    machineType: machines_v1beta1_machine_openshift_io
    machines_v1beta1_machine_openshift_io:
      failureDomains:
        platform: <platform> (6)
        <platform_failure_domains> (7)
      metadata:
        labels:
          machine.openshift.io/cluster-api-cluster: <cluster_id>
          machine.openshift.io/cluster-api-machine-role: master
          machine.openshift.io/cluster-api-machine-type: master
      spec:
        providerSpec:
          value:
            <platform_provider_spec> (8)
1 Specifies the name of the ControlPlaneMachineSet CR, which is cluster. Do not change this value.
2 Specifies the number of control plane machines. Only clusters with three control plane machines are supported, so the replicas value is 3. Horizontal scaling is not supported. Do not change this value.
3 Specifies the infrastructure ID that is based on the cluster ID that you set when you provisioned the cluster. You must specify this value when you create a ControlPlaneMachineSet CR. If you have the OpenShift CLI (oc) installed, you can obtain the infrastructure ID by running the following command: 
$ oc get -o jsonpath='{.status.infrastructureName}{"\n"}' infrastructure cluster
4 Specifies the state of the Operator. When the state is Inactive, the Operator is not operational. You can activate the Operator by setting the value to Active.

Before you activate the Operator, you must ensure that the ControlPlaneMachineSet CR configuration is correct for your cluster requirements. For more information about activating the Control Plane Machine Set Operator, see "Getting started with control plane machine sets".
5 Specifies the update strategy for the cluster. The allowed values are OnDelete and RollingUpdate. The default value is RollingUpdate. For more information about update strategies, see "Updating the control plane configuration".
6 Specifies the cloud provider platform name. Do not change this value.
7 Specifies the <platform_failure_domains> configuration for the cluster. The format and values of this section are provider-specific. For more information, see the sample failure domain configuration for your cloud provider.
8 Specifies the <platform_provider_spec> configuration for the cluster. The format and values of this section are provider-specific. For more information, see the sample provider specification for your cloud provider.
Additional resources

Provider-specific configuration options

The <platform_provider_spec> and <platform_failure_domains> sections of the control plane machine set manifests are provider specific. For provider-specific configuration options for your cluster, see the following resources: