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Creating a Windows MachineSet object on Nutanix

You can use a MachineSet custom resource (CR) to add a Windows compute node to your Nutanix cluster, where you can run Windows container workloads.

For example, you might create infrastructure Windows machine sets and related machines so that you can move supporting Windows workloads to the new Windows machines. For more information about machine sets, see "Overview of machine management" in the Additional resources section.

Prerequisites

  • You installed the Windows Machine Config Operator (WMCO) using Operator Lifecycle Manager (OLM).

  • You are using a supported Windows Server as the operating system image.

  • You added a new DNS entry for the internal API server URL, api-int.<cluster_name>.<base_domain>, that points to the external API server URL, api.<cluster_name>.<base_domain>. This can be a CNAME or an additional A record.

Sample YAML for a Windows MachineSet object on Nutanix

This sample YAML defines a Windows MachineSet object running on Nutanix that the Windows Machine Config Operator (WMCO) can react upon.

apiVersion: machine.openshift.io/v1beta1
kind: MachineSet
metadata:
  labels:
    machine.openshift.io/cluster-api-cluster: <infrastructure_id> (1)
  name: <infrastructure_id>-windows-worker-<zone> (2)
  namespace: openshift-machine-api
spec:
  replicas: 1
  selector:
    matchLabels:
      machine.openshift.io/cluster-api-cluster: <infrastructure_id> (1)
      machine.openshift.io/cluster-api-machineset: <infrastructure_id>-windows-worker-<zone> (2)
  template:
    metadata:
      labels:
        machine.openshift.io/cluster-api-cluster: <infrastructure_id> (1)
        machine.openshift.io/cluster-api-machine-role: worker
        machine.openshift.io/cluster-api-machine-type: worker
        machine.openshift.io/cluster-api-machineset: <infrastructure_id>-windows-worker-<zone> (2)
        machine.openshift.io/os-id: Windows (3)
    spec:
      metadata:
        labels:
          node-role.kubernetes.io/worker: "" (4)
      providerSpec:
        value:
          apiVersion: machine.openshift.io/v1
          bootType: "" (5)
          categories: null
          cluster: (6)
            type: uuid
            uuid: <cluster_uuid>
          credentialsSecret:
            name: nutanix-credentials (7)
          image: (8)
            name: <image_id>
            type: name
          kind: NutanixMachineProviderConfig (9)
          memorySize: 16Gi (10)
          project:
            type: ""
          subnets: (11)
          - type: uuid
            uuid: <subnet_uuid>
          systemDiskSize: 120Gi (12)
          userDataSecret:
            name: windows-user-data (13)
          vcpuSockets: 4 (14)
          vcpusPerSocket: 1 (15)
1 Specify the infrastructure ID that is based on the cluster ID that you set when you provisioned the cluster. You can obtain the infrastructure ID by running the following command: 
$ oc get -o jsonpath='{.status.infrastructureName}{"\n"}' infrastructure cluster
2 Specify the infrastructure ID, worker label, and zone.
3 Configure the compute machine set as a Windows machine.
4 Configure the Windows node as a compute machine.
5 Specifies the boot type that the compute machines use. For more information about boot types, see Understanding UEFI, Secure Boot, and TPM in the Virtualized Environment. Valid values are Legacy, SecureBoot, or UEFI. The default is Legacy.

You must use the Legacy boot type in OKD 4.18.
6 Specifies a Nutanix Prism Element cluster configuration. In this example, the cluster type is uuid, so there is a uuid stanza.
7 Specifies the secret name for the cluster. Do not change this value.
8 Specifies the image to use. Use an image from an existing default compute machine set for the cluster.
9 Specifies the cloud provider platform type. Do not change this value.
10 Specifies the amount of memory for the cluster in Gi.
11 Specifies a subnet configuration. In this example, the subnet type is uuid, so there is a uuid stanza.
12 Specifies the size of the system disk in Gi.
13 Specifies the name of the secret in the user data YAML file that is in the openshift-machine-api namespace. Use the value that installation program populates in the default compute machine set.
14 Specifies the number of vCPU sockets.
15 Specifies the number of vCPUs per socket.

Creating a compute machine set

In addition to the compute machine sets created by the installation program, you can create your own compute machine sets to dynamically manage the machine compute resources for specific workloads of your choice. Use the OKD CLI to automate node provisioning.

Prerequisites

  • Deploy an OKD cluster.

  • Install the OpenShift CLI (oc).

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

Procedure

  1. Create a new YAML file that contains the compute machine set custom resource (CR) sample and is named <file_name>.yaml.

    Ensure that you set the <clusterID> and <role> parameter values.

  2. Optional: If you are not sure which value to set for a specific field, you can check an existing compute machine set from your cluster.

    1. To list the compute machine sets in your cluster, run the following command:

      $ oc get machinesets -n openshift-machine-api
      Example output
      NAME                                DESIRED   CURRENT   READY   AVAILABLE   AGE
agl030519-vplxk-worker-us-east-1a   1         1         1       1           55m
agl030519-vplxk-worker-us-east-1b   1         1         1       1           55m
agl030519-vplxk-worker-us-east-1c   1         1         1       1           55m
agl030519-vplxk-worker-us-east-1d   0         0                             55m
agl030519-vplxk-worker-us-east-1e   0         0                             55m
agl030519-vplxk-worker-us-east-1f   0         0                             55m

    2. To view values of a specific compute machine set custom resource (CR), run the following command:

      $ oc get machineset <machineset_name> \
  -n openshift-machine-api -o yaml
      Example output
      apiVersion: machine.openshift.io/v1beta1
kind: MachineSet
metadata:
  labels:
    machine.openshift.io/cluster-api-cluster: <infrastructure_id>
  name: <infrastructure_id>-<role>
  namespace: openshift-machine-api
spec:
  replicas: 1
  selector:
    matchLabels:
      machine.openshift.io/cluster-api-cluster: <infrastructure_id>
      machine.openshift.io/cluster-api-machineset: <infrastructure_id>-<role>
  template:
    metadata:
      labels:
        machine.openshift.io/cluster-api-cluster: <infrastructure_id>
        machine.openshift.io/cluster-api-machine-role: <role>
        machine.openshift.io/cluster-api-machine-type: <role>
        machine.openshift.io/cluster-api-machineset: <infrastructure_id>-<role>
    spec:
      providerSpec:
        ...

      where:

      metadata.labels.machine.openshift.io/cluster-api-cluster

      Specifies the cluster infrastructure ID.

      metadata.labels.name

      Specifies a default node label.

      For clusters that have user-provisioned infrastructure, a compute machine set can only create worker and infra type machines.
      spec.template.metadata.spec.providerSpec

      Specifies the values of the compute machine set CR. The values are platform-specific. For more information about <providerSpec> parameters in the CR, see the sample compute machine set CR configuration for your provider.

  3. Create a MachineSet CR by running the following command:

    $ oc create -f <file_name>.yaml
Verification

  • View the list of compute machine sets by running the following command:

    $ oc get machineset -n openshift-machine-api
    Example output
    NAME                                DESIRED   CURRENT   READY   AVAILABLE   AGE
agl030519-vplxk-infra-us-east-1a    1         1         1       1           11m
agl030519-vplxk-worker-us-east-1a   1         1         1       1           55m
agl030519-vplxk-worker-us-east-1b   1         1         1       1           55m
agl030519-vplxk-worker-us-east-1c   1         1         1       1           55m
agl030519-vplxk-worker-us-east-1d   0         0                             55m
agl030519-vplxk-worker-us-east-1e   0         0                             55m
agl030519-vplxk-worker-us-east-1f   0         0                             55m

    When the new compute machine set is available, the DESIRED and CURRENT values match. If the compute machine set is not available, wait a few minutes and run the command again.

Additional resources