Chapter 12. Managing control plane machines 12.1. About control plane machine sets With control plane machine sets, you can automate management of the control plane machine resources within your OpenShift Container Platform cluster. Important Control plane machine sets cannot manage compute machines, and compute machine sets cannot manage control plane machines. Control plane machine sets provide for control plane machines similar management capabilities as compute machine sets provide for compute machines. However, these two types of machine sets are separate custom resources defined within the Machine API and have several fundamental differences in their architecture and functionality. 12.1.1. Control Plane Machine Set Operator overview The Control Plane Machine Set Operator uses the ControlPlaneMachineSet custom resource (CR) to automate management of the control plane machine resources within your OpenShift Container Platform cluster. When the state of the cluster control plane machine set is set to Active , the Operator ensures that the cluster has the correct number of control plane machines with the specified configuration. This allows the automated replacement of degraded control plane machines and rollout of changes to the control plane. A cluster has only one control plane machine set, and the Operator only manages objects in the openshift-machine-api namespace. 12.1.2. Control Plane Machine Set Operator limitations The Control Plane Machine Set Operator has the following limitations: Only Amazon Web Services (AWS), Microsoft Azure, and VMware vSphere clusters are supported. Clusters that do not have preexisting machines that represent the control plane nodes cannot use a control plane machine set or enable the use of a control plane machine set after installation. Generally, preexisting control plane machines are only present if a cluster was installed using infrastructure provisioned by the installation program. To determine if a cluster has the required preexisting control plane machines, run the following command as a user with administrator privileges: USD oc get machine \ -n openshift-machine-api \ -l machine.openshift.io/cluster-api-machine-role=master Example output showing preexisting control plane machines NAME PHASE TYPE REGION ZONE AGE <infrastructure_id>-master-0 Running m6i.xlarge us-west-1 us-west-1a 5h19m <infrastructure_id>-master-1 Running m6i.xlarge us-west-1 us-west-1b 5h19m <infrastructure_id>-master-2 Running m6i.xlarge us-west-1 us-west-1a 5h19m Example output missing preexisting control plane machines No resources found in openshift-machine-api namespace. The Operator requires the Machine API Operator to be operational and is therefore not supported on clusters with manually provisioned machines. When installing a OpenShift Container Platform cluster with manually provisioned machines for a platform that creates an active generated ControlPlaneMachineSet custom resource (CR), you must remove the Kubernetes manifest files that define the control plane machine set as instructed in the installation process. Only clusters with three control plane machines are supported. Horizontal scaling of the control plane is not supported. Deploying Azure control plane machines on Ephemeral OS disks increases risk for data loss and is not supported. Deploying control plane machines as AWS Spot Instances or Azure Spot VMs is not supported. Important Attempting to deploy control plane machines as AWS Spot Instances or Azure Spot VMs might cause the cluster to lose etcd quorum. A cluster that loses all control plane machines simultaneously is unrecoverable. Making changes to the control plane machine set during or prior to installation is not supported. You must make any changes to the control plane machine set only after installation. 12.1.3. Additional resources Control Plane Machine Set Operator reference ControlPlaneMachineSet custom resource 12.2. Getting started with control plane machine sets The process for getting started with control plane machine sets depends on the state of the ControlPlaneMachineSet custom resource (CR) in your cluster. Clusters with an active generated CR Clusters that have a generated CR with an active state use the control plane machine set by default. No administrator action is required. Clusters with an inactive generated CR For clusters that include an inactive generated CR, you must review the CR configuration and activate the CR . Clusters without a generated CR For clusters that do not include a generated CR, you must create and activate a CR with the appropriate configuration for your cluster. If you are uncertain about the state of the ControlPlaneMachineSet CR in your cluster, you can verify the CR status . 12.2.1. Supported cloud providers In OpenShift Container Platform 4.12, the control plane machine sets are supported for Amazon Web Services (AWS), Microsoft Azure, and VMware vSphere clusters. The status of the control plane machine set after installation depends on your cloud provider and the version of OpenShift Container Platform that you installed on your cluster. Table 12.1. Control plane machine set implementation for OpenShift Container Platform 4.12 Cloud provider Active by default Generated CR Manual CR required Amazon Web Services (AWS) X [1] X Microsoft Azure X VMware vSphere X AWS clusters that are upgraded to version 4.12 from an earlier version require CR activation . 12.2.2. Checking the control plane machine set custom resource state You can verify the existence and state of the ControlPlaneMachineSet custom resource (CR). Procedure Determine the state of the CR by running the following command: USD oc get controlplanemachineset.machine.openshift.io cluster \ --namespace openshift-machine-api A result of Active indicates that the ControlPlaneMachineSet CR exists and is activated. No administrator action is required. A result of Inactive indicates that a ControlPlaneMachineSet CR exists but is not activated. A result of NotFound indicates that there is no existing ControlPlaneMachineSet CR. steps To use the control plane machine set, you must ensure that a ControlPlaneMachineSet CR with the correct settings for your cluster exists. If your cluster has an existing CR, you must verify that the configuration in the CR is correct for your cluster. If your cluster does not have an existing CR, you must create one with the correct configuration for your cluster. 12.2.3. Activating the control plane machine set custom resource To use the control plane machine set, you must ensure that a ControlPlaneMachineSet custom resource (CR) with the correct settings for your cluster exists. On a cluster with a generated CR, you must verify that the configuration in the CR is correct for your cluster and activate it. Note For more information about the parameters in the CR, see "Control plane machine set configuration". Procedure View the configuration of the CR by running the following command: USD oc --namespace openshift-machine-api edit controlplanemachineset.machine.openshift.io cluster Change the values of any fields that are incorrect for your cluster configuration. When the configuration is correct, activate the CR by setting the .spec.state field to Active and saving your changes. Important To activate the CR, you must change the .spec.state field to Active in the same oc edit session that you use to update the CR configuration. If the CR is saved with the state left as Inactive , the control plane machine set generator resets the CR to its original settings. Additional resources Control Plane Machine Set Operator configuration 12.2.4. Creating a control plane machine set custom resource To use the control plane machine set, you must ensure that a ControlPlaneMachineSet custom resource (CR) with the correct settings for your cluster exists. On a cluster without a generated CR, you must create the CR manually and activate it. Note For more information about the structure and parameters of the CR, see "Control plane machine set configuration". Procedure Create a YAML file using the following template: Control plane machine set CR YAML file template apiVersion: machine.openshift.io/v1 kind: ControlPlaneMachineSet metadata: name: cluster namespace: openshift-machine-api spec: replicas: 3 selector: matchLabels: machine.openshift.io/cluster-api-cluster: <cluster_id> 1 machine.openshift.io/cluster-api-machine-role: master machine.openshift.io/cluster-api-machine-type: master state: Active 2 strategy: type: RollingUpdate 3 template: machineType: machines_v1beta1_machine_openshift_io machines_v1beta1_machine_openshift_io: failureDomains: platform: <platform> 4 <platform_failure_domains> 5 metadata: labels: machine.openshift.io/cluster-api-cluster: <cluster_id> 6 machine.openshift.io/cluster-api-machine-role: master machine.openshift.io/cluster-api-machine-type: master spec: providerSpec: value: <platform_provider_spec> 7 1 Specify 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: USD oc get -o jsonpath='{.status.infrastructureName}{"\n"}' infrastructure cluster 2 Specify 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 . Important Before you activate the CR, you must ensure that its configuration is correct for your cluster requirements. 3 Specify the update strategy for the cluster. The allowed values are OnDelete and RollingUpdate . The default value is RollingUpdate . 4 Specify your cloud provider platform name. The allowed values are AWS , Azure , and VSphere . 5 Add 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. Note VMware vSphere does not support failure domains. For vSphere clusters, replace <platform_failure_domains> with an empty failureDomains: parameter. 6 Specify the infrastructure ID. 7 Add 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. Refer to the sample YAML for a control plane machine set CR and populate your file with values that are appropriate for your cluster configuration. Refer to the sample failure domain configuration and sample provider specification for your cloud provider and update those sections of your file with the appropriate values. When the configuration is correct, activate the CR by setting the .spec.state field to Active and saving your changes. Create the CR from your YAML file by running the following command: USD oc create -f <control_plane_machine_set>.yaml where <control_plane_machine_set> is the name of the YAML file that contains the CR configuration. Additional resources Control Plane Machine Set Operator configuration Sample YAML for configuring Amazon Web Services clusters Sample YAML for configuring Microsoft Azure clusters Sample YAML for configuring VMware vSphere clusters 12.3. Control plane machine set configuration These example YAML file and snippets demonstrate the base structure for a control plane machine set custom resource (CR) and platform-specific samples for failure domain and provider specification configurations. 12.3.1. 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: USD 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 . Important 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. Note VMware vSphere does not support failure domains. 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 Getting started with control plane machine sets Updating the control plane configuration Provider-specific configuration The <platform_provider_spec> and <platform_failure_domains> sections of the control plane machine set resources are provider-specific. Refer to the example YAML for your cluster: Sample YAML snippets for configuring Amazon Web Services clusters Sample YAML snippets for configuring Microsoft Azure clusters Sample YAML snippets for configuring VMware vSphere clusters 12.3.2. Sample YAML for configuring Amazon Web Services clusters Some sections of the control plane machine set CR are provider-specific. The example YAML in this section show failure domain and provider specification configurations for an Amazon Web Services (AWS) cluster. 12.3.2.1. Sample AWS failure domain configuration The control plane machine set concept of a failure domain is analogous to existing AWS concept of an Availability Zone (AZ) . The ControlPlaneMachineSet CR spreads control plane machines across multiple failure domains when possible. When configuring AWS failure domains in the control plane machine set, you must specify the availability zone name and the subnet to use. Sample AWS failure domain values failureDomains: aws: - placement: availabilityZone: <aws_zone_a> 1 subnet: 2 filters: - name: tag:Name values: - <cluster_id>-private-<aws_zone_a> 3 type: Filters 4 - placement: availabilityZone: <aws_zone_b> 5 subnet: filters: - name: tag:Name values: - <cluster_id>-private-<aws_zone_b> 6 type: Filters platform: AWS 7 1 Specifies an AWS availability zone for the first failure domain. 2 Specifies a subnet configuration. In this example, the subnet type is Filters , so there is a filters stanza. 3 Specifies the subnet name for the first failure domain, using the infrastructure ID and the AWS availability zone. 4 Specifies the subnet type. The allowed values are: ARN , Filters and ID . The default value is Filters . 5 Specifies the subnet name for an additional failure domain, using the infrastructure ID and the AWS availability zone. 6 Specifies the cluster's infrastructure ID and the AWS availability zone for the additional failure domain. 7 Specifies the cloud provider platform name. Do not change this value. 12.3.2.2. Sample AWS provider specification When you create a control plane machine set for an existing cluster, the provider specification must match the providerSpec configuration in the control plane machine CR that is created by the installation program. You can omit any field that is set in the failure domain section of the CR. In the following example, <cluster_id> is the infrastructure ID that is based on the cluster ID that you set when you provisioned the cluster. If you have the OpenShift CLI installed, you can obtain the infrastructure ID by running the following command: USD oc get -o jsonpath='{.status.infrastructureName}{"\n"}' infrastructure cluster Sample AWS providerSpec values providerSpec: value: ami: id: ami-<ami_id_string> 1 apiVersion: machine.openshift.io/v1beta1 blockDevices: - ebs: 2 encrypted: true iops: 0 kmsKey: arn: "" volumeSize: 120 volumeType: gp3 credentialsSecret: name: aws-cloud-credentials 3 deviceIndex: 0 iamInstanceProfile: id: <cluster_id>-master-profile 4 instanceType: m6i.xlarge 5 kind: AWSMachineProviderConfig 6 loadBalancers: 7 - name: <cluster_id>-int type: network - name: <cluster_id>-ext type: network metadata: creationTimestamp: null metadataServiceOptions: {} placement: 8 region: <region> 9 securityGroups: - filters: - name: tag:Name values: - <cluster_id>-master-sg 10 subnet: {} 11 userDataSecret: name: master-user-data 12 1 Specifies the Red Hat Enterprise Linux CoreOS (RHCOS) Amazon Machine Images (AMI) ID for the cluster. The AMI must belong to the same region as the cluster. If you want to use an AWS Marketplace image, you must complete the OpenShift Container Platform subscription from the AWS Marketplace to obtain an AMI ID for your region. 2 Specifies the configuration of an encrypted EBS volume. 3 Specifies the secret name for the cluster. Do not change this value. 4 Specifies the AWS Identity and Access Management (IAM) instance profile. Do not change this value. 5 Specifies the AWS instance type for the control plane. 6 Specifies the cloud provider platform type. Do not change this value. 7 Specifies the internal ( int ) and external ( ext ) load balancers for the cluster. Note You can omit the external ( ext ) load balancer parameters on private OpenShift Container Platform clusters. 8 This parameter is configured in the failure domain, and is shown with an empty value here. If a value specified for this parameter differs from the value in the failure domain, the Operator overwrites it with the value in the failure domain. 9 Specifies the AWS region for the cluster. 10 Specifies the control plane machines security group. 11 This parameter is configured in the failure domain, and is shown with an empty value here. If a value specified for this parameter differs from the value in the failure domain, the Operator overwrites it with the value in the failure domain. 12 Specifies the control plane user data secret. Do not change this value. Additional resources Enabling Amazon Web Services features for control plane machines 12.3.3. Sample YAML for configuring Microsoft Azure clusters Some sections of the control plane machine set CR are provider-specific. The example YAML in this section show failure domain and provider specification configurations for an Azure cluster. 12.3.3.1. Sample Azure failure domain configuration The control plane machine set concept of a failure domain is analogous to existing Azure concept of an Azure availability zone . The ControlPlaneMachineSet CR spreads control plane machines across multiple failure domains when possible. When configuring Azure failure domains in the control plane machine set, you must specify the availability zone name. Sample Azure failure domain values failureDomains: azure: 1 - zone: "1" - zone: "2" - zone: "3" platform: Azure 2 1 Each instance of zone specifies an Azure availability zone for a failure domain. 2 Specifies the cloud provider platform name. Do not change this value. 12.3.3.2. Sample Azure provider specification When you create a control plane machine set for an existing cluster, the provider specification must match the providerSpec configuration in the control plane Machine CR that is created by the installation program. You can omit any field that is set in the failure domain section of the CR. In the following example, <cluster_id> is the infrastructure ID that is based on the cluster ID that you set when you provisioned the cluster. If you have the OpenShift CLI installed, you can obtain the infrastructure ID by running the following command: USD oc get -o jsonpath='{.status.infrastructureName}{"\n"}' infrastructure cluster Sample Azure providerSpec values providerSpec: value: acceleratedNetworking: true apiVersion: machine.openshift.io/v1beta1 credentialsSecret: name: azure-cloud-credentials 1 namespace: openshift-machine-api diagnostics: {} image: 2 offer: "" publisher: "" resourceID: /resourceGroups/<cluster_id>-rg/providers/Microsoft.Compute/galleries/gallery_<cluster_id>/images/<cluster_id>-gen2/versions/412.86.20220930 3 sku: "" version: "" internalLoadBalancer: <cluster_id>-internal 4 kind: AzureMachineProviderSpec 5 location: <region> 6 managedIdentity: <cluster_id>-identity metadata: creationTimestamp: null name: <cluster_id> networkResourceGroup: <cluster_id>-rg osDisk: 7 diskSettings: {} diskSizeGB: 1024 managedDisk: storageAccountType: Premium_LRS osType: Linux publicIP: false publicLoadBalancer: <cluster_id> 8 resourceGroup: <cluster_id>-rg subnet: <cluster_id>-master-subnet 9 userDataSecret: name: master-user-data 10 vmSize: Standard_D8s_v3 vnet: <cluster_id>-vnet zone: "" 11 1 Specifies the secret name for the cluster. Do not change this value. 2 Specifies the image details for your control plane machine set. 3 Specifies an image that is compatible with your instance type. The Hyper-V generation V2 images created by the installation program have a -gen2 suffix, while V1 images have the same name without the suffix. 4 Specifies the internal load balancer for the control plane. This field might not be preconfigured but is required in both the ControlPlaneMachineSet and control plane Machine CRs. 5 Specifies the cloud provider platform type. Do not change this value. 6 Specifies the region to place control plane machines on. 7 Specifies the disk configuration for the control plane. 8 Specifies the public load balancer for the control plane. Note You can omit the publicLoadBalancer parameter on private OpenShift Container Platform clusters that have user-defined outbound routing. 9 Specifies the subnet for the control plane. 10 Specifies the control plane user data secret. Do not change this value. 11 This parameter is configured in the failure domain, and is shown with an empty value here. If a value specified for this parameter differs from the value in the failure domain, the Operator overwrites it with the value in the failure domain. Additional resources Enabling Microsoft Azure features for control plane machines 12.3.4. Sample YAML for configuring VMware vSphere clusters Some sections of the control plane machine set CR are provider-specific. The example YAML in this section shows a provider specification configuration for a VMware vSphere cluster. 12.3.4.1. Sample vSphere provider specification When you create a control plane machine set for an existing cluster, the provider specification must match the providerSpec configuration in the control plane machine CR that is created by the installation program. Sample vSphere providerSpec values providerSpec: value: apiVersion: machine.openshift.io/v1beta1 credentialsSecret: name: vsphere-cloud-credentials 1 diskGiB: 120 2 kind: VSphereMachineProviderSpec 3 memoryMiB: 16384 4 metadata: creationTimestamp: null network: 5 devices: - networkName: <vm_network_name> numCPUs: 4 6 numCoresPerSocket: 4 7 snapshot: "" template: <vm_template_name> 8 userDataSecret: name: master-user-data 9 workspace: datacenter: <vcenter_datacenter_name> 10 datastore: <vcenter_datastore_name> 11 folder: <path_to_vcenter_vm_folder> 12 resourcePool: <vsphere_resource_pool> 13 server: <vcenter_server_ip> 14 1 Specifies the secret name for the cluster. Do not change this value. 2 Specifies the VM disk size for the control plane machines. 3 Specifies the cloud provider platform type. Do not change this value. 4 Specifies the memory allocated for the control plane machines. 5 Specifies the network on which the control plane is deployed. 6 Specifies the number of CPUs allocated for the control plane machines. 7 Specifies the number of cores for each control plane CPU. 8 Specifies the vSphere VM template to use, such as user-5ddjd-rhcos . 9 Specifies the control plane user data secret. Do not change this value. 10 Specifies the vCenter Datacenter for the control plane. 11 Specifies the vCenter Datastore for the control plane. 12 Specifies the path to the vSphere VM folder in vCenter, such as /dc1/vm/user-inst-5ddjd . 13 Specifies the vSphere resource pool for your VMs. 14 Specifies the vCenter server IP or fully qualified domain name. 12.4. Managing control plane machines with control plane machine sets Control plane machine sets automate several essential aspects of control plane management. 12.4.1. Replacing a control plane machine To replace a control plane machine in a cluster that has a control plane machine set, you delete the machine manually. The control plane machine set replaces the deleted machine with one using the specification in the control plane machine set custom resource (CR). Procedure List the control plane machines in your cluster by running the following command: USD oc get machines \ -l machine.openshift.io/cluster-api-machine-role==master \ -n openshift-machine-api Delete a control plane machine by running the following command: USD oc delete machine \ -n openshift-machine-api \ <control_plane_machine_name> 1 1 Specify the name of the control plane machine to delete. Note If you delete multiple control plane machines, the control plane machine set replaces them according to the configured update strategy: For clusters that use the default RollingUpdate update strategy, the Operator replaces one machine at a time until each machine is replaced. For clusters that are configured to use the OnDelete update strategy, the Operator creates all of the required replacement machines simultaneously. Both strategies maintain etcd health during control plane machine replacement. 12.4.2. Updating the control plane configuration You can make changes to the configuration of the machines in the control plane by updating the specification in the control plane machine set custom resource (CR). The Control Plane Machine Set Operator monitors the control plane machines and compares their configuration with the specification in the control plane machine set CR. When there is a discrepancy between the specification in the CR and the configuration of a control plane machine, the Operator marks that control plane machine for replacement. Note For more information about the parameters in the CR, see "Control plane machine set configuration". Prerequisites Your cluster has an activated and functioning Control Plane Machine Set Operator. Procedure Edit your control plane machine set CR by running the following command: USD oc edit controlplanemachineset.machine.openshift.io cluster \ -n openshift-machine-api Change the values of any fields that you want to update in your cluster configuration. Save your changes. steps For clusters that use the default RollingUpdate update strategy, the control plane machine set propagates changes to your control plane configuration automatically. For clusters that are configured to use the OnDelete update strategy, you must replace your control plane machines manually. 12.4.2.1. Automatic updates to the control plane configuration The RollingUpdate update strategy automatically propagates changes to your control plane configuration. This update strategy is the default configuration for the control plane machine set. For clusters that use the RollingUpdate update strategy, the Operator creates a replacement control plane machine with the configuration that is specified in the CR. When the replacement control plane machine is ready, the Operator deletes the control plane machine that is marked for replacement. The replacement machine then joins the control plane. If multiple control plane machines are marked for replacement, the Operator protects etcd health during replacement by repeating this replacement process one machine at a time until it has replaced each machine. 12.4.2.2. Manual updates to the control plane configuration You can use the OnDelete update strategy to propagate changes to your control plane configuration by replacing machines manually. Manually replacing machines allows you to test changes to your configuration on a single machine before applying the changes more broadly. For clusters that are configured to use the OnDelete update strategy, the Operator creates a replacement control plane machine when you delete an existing machine. When the replacement control plane machine is ready, the etcd Operator allows the existing machine to be deleted. The replacement machine then joins the control plane. If multiple control plane machines are deleted, the Operator creates all of the required replacement machines simultaneously. The Operator maintains etcd health by preventing more than one machine being removed from the control plane at once. 12.4.3. Enabling Amazon Web Services features for control plane machines You can enable Amazon Web Services (AWS) features on control plane machines by changing the configuration of your control plane machine set. When you save an update to the control plane machine set, the Control Plane Machine Set Operator updates the control plane machines according to your configured update strategy. 12.4.3.1. Restricting the API server to private After you deploy a cluster to Amazon Web Services (AWS), you can reconfigure the API server to use only the private zone. Prerequisites Install the OpenShift CLI ( oc ). Have access to the web console as a user with admin privileges. Procedure In the web portal or console for your cloud provider, take the following actions: Locate and delete the appropriate load balancer component: For AWS, delete the external load balancer. The API DNS entry in the private zone already points to the internal load balancer, which uses an identical configuration, so you do not need to modify the internal load balancer. Delete the api.USDclustername.USDyourdomain DNS entry in the public zone. Remove the external load balancers by deleting the following lines in the control plane machine set custom resource: providerSpec: value: loadBalancers: - name: lk4pj-ext 1 type: network 2 - name: lk4pj-int type: network 1 2 Delete this line. 12.4.3.2. Changing the Amazon Web Services instance type by using a control plane machine set You can change the Amazon Web Services (AWS) instance type that your control plane machines use by updating the specification in the control plane machine set custom resource (CR). Prerequisites Your AWS cluster uses a control plane machine set. Procedure Edit the following line under the providerSpec field: providerSpec: value: ... instanceType: <compatible_aws_instance_type> 1 1 Specify a larger AWS instance type with the same base as the selection. For example, you can change m6i.xlarge to m6i.2xlarge or m6i.4xlarge . Save your changes. 12.4.3.3. Machine set options for the Amazon EC2 Instance Metadata Service You can use machine sets to create machines that use a specific version of the Amazon EC2 Instance Metadata Service (IMDS). Machine sets can create machines that allow the use of both IMDSv1 and IMDSv2 or machines that require the use of IMDSv2. Note Using IMDSv2 is only supported on AWS clusters that were created with OpenShift Container Platform version 4.7 or later. Important Before configuring a machine set to create machines that require IMDSv2, ensure that any workloads that interact with the AWS metadata service support IMDSv2. 12.4.3.3.1. Configuring IMDS by using machine sets You can specify whether to require the use of IMDSv2 by adding or editing the value of metadataServiceOptions.authentication in the machine set YAML file for your machines. Prerequisites To use IMDSv2, your AWS cluster must have been created with OpenShift Container Platform version 4.7 or later. Procedure Add or edit the following lines under the providerSpec field: providerSpec: value: metadataServiceOptions: authentication: Required 1 1 To require IMDSv2, set the parameter value to Required . To allow the use of both IMDSv1 and IMDSv2, set the parameter value to Optional . If no value is specified, both IMDSv1 and IMDSv2 are allowed. 12.4.3.4. Machine sets that deploy machines as Dedicated Instances You can create a machine set running on AWS that deploys machines as Dedicated Instances. Dedicated Instances run in a virtual private cloud (VPC) on hardware that is dedicated to a single customer. These Amazon EC2 instances are physically isolated at the host hardware level. The isolation of Dedicated Instances occurs even if the instances belong to different AWS accounts that are linked to a single payer account. However, other instances that are not dedicated can share hardware with Dedicated Instances if they belong to the same AWS account. Instances with either public or dedicated tenancy are supported by the Machine API. Instances with public tenancy run on shared hardware. Public tenancy is the default tenancy. Instances with dedicated tenancy run on single-tenant hardware. 12.4.3.4.1. Creating Dedicated Instances by using machine sets You can run a machine that is backed by a Dedicated Instance by using Machine API integration. Set the tenancy field in your machine set YAML file to launch a Dedicated Instance on AWS. Procedure Specify a dedicated tenancy under the providerSpec field: providerSpec: placement: tenancy: dedicated 12.4.4. Enabling Microsoft Azure features for control plane machines You can enable Microsoft Azure features on control plane machines by changing the configuration of your control plane machine set. When you save an update to the control plane machine set, the Control Plane Machine Set Operator updates the control plane machines according to your configured update strategy. 12.4.4.1. Restricting the API server to private After you deploy a cluster to Microsoft Azure, you can reconfigure the API server to use only the private zone. Prerequisites Install the OpenShift CLI ( oc ). Have access to the web console as a user with admin privileges. Procedure In the web portal or console for your cloud provider, take the following actions: Locate and delete the appropriate load balancer component: For Azure, delete the api-internal rule for the load balancer. Delete the api.USDclustername.USDyourdomain DNS entry in the public zone. Remove the external load balancers by deleting the following lines in the control plane machine set custom resource: providerSpec: value: loadBalancers: - name: lk4pj-ext 1 type: network 2 - name: lk4pj-int type: network 1 2 Delete this line. 12.4.4.2. Selecting an Azure Marketplace image You can create a machine set running on Azure that deploys machines that use the Azure Marketplace offering. To use this offering, you must first obtain the Azure Marketplace image. When obtaining your image, consider the following: While the images are the same, the Azure Marketplace publisher is different depending on your region. If you are located in North America, specify redhat as the publisher. If you are located in EMEA, specify redhat-limited as the publisher. The offer includes a rh-ocp-worker SKU and a rh-ocp-worker-gen1 SKU. The rh-ocp-worker SKU represents a Hyper-V generation version 2 VM image. The default instance types used in OpenShift Container Platform are version 2 compatible. If you plan to use an instance type that is only version 1 compatible, use the image associated with the rh-ocp-worker-gen1 SKU. The rh-ocp-worker-gen1 SKU represents a Hyper-V version 1 VM image. Important Installing images with the Azure marketplace is not supported on clusters with 64-bit ARM instances. Prerequisites You have installed the Azure CLI client (az) . Your Azure account is entitled for the offer and you have logged into this account with the Azure CLI client. Procedure Display all of the available OpenShift Container Platform images by running one of the following commands: North America: USD az vm image list --all --offer rh-ocp-worker --publisher redhat -o table Example output Offer Publisher Sku Urn Version ------------- -------------- ------------------ -------------------------------------------------------------- -------------- rh-ocp-worker RedHat rh-ocp-worker RedHat:rh-ocp-worker:rh-ocpworker:4.8.2021122100 4.8.2021122100 rh-ocp-worker RedHat rh-ocp-worker-gen1 RedHat:rh-ocp-worker:rh-ocp-worker-gen1:4.8.2021122100 4.8.2021122100 EMEA: USD az vm image list --all --offer rh-ocp-worker --publisher redhat-limited -o table Example output Offer Publisher Sku Urn Version ------------- -------------- ------------------ -------------------------------------------------------------- -------------- rh-ocp-worker redhat-limited rh-ocp-worker redhat-limited:rh-ocp-worker:rh-ocp-worker:4.8.2021122100 4.8.2021122100 rh-ocp-worker redhat-limited rh-ocp-worker-gen1 redhat-limited:rh-ocp-worker:rh-ocp-worker-gen1:4.8.2021122100 4.8.2021122100 Note Regardless of the version of OpenShift Container Platform that you install, the correct version of the Azure Marketplace image to use is 4.8. If required, your VMs are automatically upgraded as part of the installation process. Inspect the image for your offer by running one of the following commands: North America: USD az vm image show --urn redhat:rh-ocp-worker:rh-ocp-worker:<version> EMEA: USD az vm image show --urn redhat-limited:rh-ocp-worker:rh-ocp-worker:<version> Review the terms of the offer by running one of the following commands: North America: USD az vm image terms show --urn redhat:rh-ocp-worker:rh-ocp-worker:<version> EMEA: USD az vm image terms show --urn redhat-limited:rh-ocp-worker:rh-ocp-worker:<version> Accept the terms of the offering by running one of the following commands: North America: USD az vm image terms accept --urn redhat:rh-ocp-worker:rh-ocp-worker:<version> EMEA: USD az vm image terms accept --urn redhat-limited:rh-ocp-worker:rh-ocp-worker:<version> Record the image details of your offer, specifically the values for publisher , offer , sku , and version . Add the following parameters to the providerSpec section of your machine set YAML file using the image details for your offer: Sample providerSpec image values for Azure Marketplace machines providerSpec: value: image: offer: rh-ocp-worker publisher: redhat resourceID: "" sku: rh-ocp-worker type: MarketplaceWithPlan version: 4.8.2021122100 12.4.4.3. Enabling Azure boot diagnostics You can enable boot diagnostics on Azure machines that your machine set creates. Prerequisites Have an existing Microsoft Azure cluster. Procedure Add the diagnostics configuration that is applicable to your storage type to the providerSpec field in your machine set YAML file: For an Azure Managed storage account: providerSpec: diagnostics: boot: storageAccountType: AzureManaged 1 1 Specifies an Azure Managed storage account. For an Azure Unmanaged storage account: providerSpec: diagnostics: boot: storageAccountType: CustomerManaged 1 customerManaged: storageAccountURI: https://<storage-account>.blob.core.windows.net 2 1 Specifies an Azure Unmanaged storage account. 2 Replace <storage-account> with the name of your storage account. Note Only the Azure Blob Storage data service is supported. Verification On the Microsoft Azure portal, review the Boot diagnostics page for a machine deployed by the machine set, and verify that you can see the serial logs for the machine. 12.4.4.4. Machine sets that deploy machines with ultra disks as data disks You can create a machine set running on Azure that deploys machines with ultra disks. Ultra disks are high-performance storage that are intended for use with the most demanding data workloads. Additional resources Microsoft Azure ultra disks documentation 12.4.4.4.1. Creating machines with ultra disks by using machine sets You can deploy machines with ultra disks on Azure by editing your machine set YAML file. Prerequisites Have an existing Microsoft Azure cluster. Procedure Create a custom secret in the openshift-machine-api namespace using the master data secret by running the following command: USD oc -n openshift-machine-api \ get secret <role>-user-data \ 1 --template='{{index .data.userData | base64decode}}' | jq > userData.txt 2 1 Replace <role> with master . 2 Specify userData.txt as the name of the new custom secret. In a text editor, open the userData.txt file and locate the final } character in the file. On the immediately preceding line, add a , . Create a new line after the , and add the following configuration details: "storage": { "disks": [ 1 { "device": "/dev/disk/azure/scsi1/lun0", 2 "partitions": [ 3 { "label": "lun0p1", 4 "sizeMiB": 1024, 5 "startMiB": 0 } ] } ], "filesystems": [ 6 { "device": "/dev/disk/by-partlabel/lun0p1", "format": "xfs", "path": "/var/lib/lun0p1" } ] }, "systemd": { "units": [ 7 { "contents": "[Unit]\nBefore=local-fs.target\n[Mount]\nWhere=/var/lib/lun0p1\nWhat=/dev/disk/by-partlabel/lun0p1\nOptions=defaults,pquota\n[Install]\nWantedBy=local-fs.target\n", 8 "enabled": true, "name": "var-lib-lun0p1.mount" } ] } 1 The configuration details for the disk that you want to attach to a node as an ultra disk. 2 Specify the lun value that is defined in the dataDisks stanza of the machine set you are using. For example, if the machine set contains lun: 0 , specify lun0 . You can initialize multiple data disks by specifying multiple "disks" entries in this configuration file. If you specify multiple "disks" entries, ensure that the lun value for each matches the value in the machine set. 3 The configuration details for a new partition on the disk. 4 Specify a label for the partition. You might find it helpful to use hierarchical names, such as lun0p1 for the first partition of lun0 . 5 Specify the total size in MiB of the partition. 6 Specify the filesystem to use when formatting a partition. Use the partition label to specify the partition. 7 Specify a systemd unit to mount the partition at boot. Use the partition label to specify the partition. You can create multiple partitions by specifying multiple "partitions" entries in this configuration file. If you specify multiple "partitions" entries, you must specify a systemd unit for each. 8 For Where , specify the value of storage.filesystems.path . For What , specify the value of storage.filesystems.device . Extract the disabling template value to a file called disableTemplating.txt by running the following command: USD oc -n openshift-machine-api get secret <role>-user-data \ 1 --template='{{index .data.disableTemplating | base64decode}}' | jq > disableTemplating.txt 1 Replace <role> with master . Combine the userData.txt file and disableTemplating.txt file to create a data secret file by running the following command: USD oc -n openshift-machine-api create secret generic <role>-user-data-x5 \ 1 --from-file=userData=userData.txt \ --from-file=disableTemplating=disableTemplating.txt 1 For <role>-user-data-x5 , specify the name of the secret. Replace <role> with master . Edit your control plane machine set CR by running the following command: USD oc --namespace openshift-machine-api edit controlplanemachineset.machine.openshift.io cluster Add the following lines in the positions indicated: apiVersion: machine.openshift.io/v1beta1 kind: ControlPlaneMachineSet spec: template: spec: metadata: labels: disk: ultrassd 1 providerSpec: value: ultraSSDCapability: Enabled 2 dataDisks: 3 - nameSuffix: ultrassd lun: 0 diskSizeGB: 4 deletionPolicy: Delete cachingType: None managedDisk: storageAccountType: UltraSSD_LRS userDataSecret: name: <role>-user-data-x5 4 1 Specify a label to use to select a node that is created by this machine set. This procedure uses disk.ultrassd for this value. 2 3 These lines enable the use of ultra disks. For dataDisks , include the entire stanza. 4 Specify the user data secret created earlier. Replace <role> with master . Save your changes. For clusters that use the default RollingUpdate update strategy, the Operator automatically propagates the changes to your control plane configuration. For clusters that are configured to use the OnDelete update strategy, you must replace your control plane machines manually. Verification Validate that the machines are created by running the following command: USD oc get machines The machines should be in the Running state. For a machine that is running and has a node attached, validate the partition by running the following command: USD oc debug node/<node-name> -- chroot /host lsblk In this command, oc debug node/<node-name> starts a debugging shell on the node <node-name> and passes a command with -- . The passed command chroot /host provides access to the underlying host OS binaries, and lsblk shows the block devices that are attached to the host OS machine. steps To use an ultra disk on the control plane, reconfigure your workload to use the control plane's ultra disk mount point. 12.4.4.4.2. Troubleshooting resources for machine sets that enable ultra disks Use the information in this section to understand and recover from issues you might encounter. 12.4.4.4.2.1. Incorrect ultra disk configuration If an incorrect configuration of the ultraSSDCapability parameter is specified in the machine set, the machine provisioning fails. For example, if the ultraSSDCapability parameter is set to Disabled , but an ultra disk is specified in the dataDisks parameter, the following error message appears: StorageAccountType UltraSSD_LRS can be used only when additionalCapabilities.ultraSSDEnabled is set. To resolve this issue, verify that your machine set configuration is correct. 12.4.4.4.2.2. Unsupported disk parameters If a region, availability zone, or instance size that is not compatible with ultra disks is specified in the machine set, the machine provisioning fails. Check the logs for the following error message: failed to create vm <machine_name>: failure sending request for machine <machine_name>: cannot create vm: compute.VirtualMachinesClient#CreateOrUpdate: Failure sending request: StatusCode=400 -- Original Error: Code="BadRequest" Message="Storage Account type 'UltraSSD_LRS' is not supported <more_information_about_why>." To resolve this issue, verify that you are using this feature in a supported environment and that your machine set configuration is correct. 12.4.4.4.2.3. Unable to delete disks If the deletion of ultra disks as data disks is not working as expected, the machines are deleted and the data disks are orphaned. You must delete the orphaned disks manually if desired. 12.4.4.5. Enabling customer-managed encryption keys for a machine set You can supply an encryption key to Azure to encrypt data on managed disks at rest. You can enable server-side encryption with customer-managed keys by using the Machine API. An Azure Key Vault, a disk encryption set, and an encryption key are required to use a customer-managed key. The disk encryption set must be in a resource group where the Cloud Credential Operator (CCO) has granted permissions. If not, an additional reader role is required to be granted on the disk encryption set. Prerequisites Create an Azure Key Vault instance . Create an instance of a disk encryption set . Grant the disk encryption set access to key vault . Procedure Configure the disk encryption set under the providerSpec field in your machine set YAML file. For example: providerSpec: value: osDisk: diskSizeGB: 128 managedDisk: diskEncryptionSet: id: /subscriptions/<subscription_id>/resourceGroups/<resource_group_name>/providers/Microsoft.Compute/diskEncryptionSets/<disk_encryption_set_name> storageAccountType: Premium_LRS Additional resources Azure documentation about customer-managed keys 12.4.4.6. Accelerated Networking for Microsoft Azure VMs Accelerated Networking uses single root I/O virtualization (SR-IOV) to provide Microsoft Azure VMs with a more direct path to the switch. This enhances network performance. This feature can be enabled after installation. 12.4.4.6.1. Limitations Consider the following limitations when deciding whether to use Accelerated Networking: Accelerated Networking is only supported on clusters where the Machine API is operational. Accelerated Networking requires an Azure VM size that includes at least four vCPUs. To satisfy this requirement, you can change the value of vmSize in your machine set. For information about Azure VM sizes, see Microsoft Azure documentation . 12.4.4.6.2. Enabling Accelerated Networking on an existing Microsoft Azure cluster You can enable Accelerated Networking on Azure by adding acceleratedNetworking to your machine set YAML file. Prerequisites Have an existing Microsoft Azure cluster where the Machine API is operational. Procedure Add the following to the providerSpec field: providerSpec: value: acceleratedNetworking: true 1 vmSize: <azure-vm-size> 2 1 This line enables Accelerated Networking. 2 Specify an Azure VM size that includes at least four vCPUs. For information about VM sizes, see Microsoft Azure documentation . Verification On the Microsoft Azure portal, review the Networking settings page for a machine provisioned by the machine set, and verify that the Accelerated networking field is set to Enabled . 12.5. Control plane resiliency and recovery You can use the control plane machine set to improve the resiliency of the control plane for your OpenShift Container Platform cluster. 12.5.1. High availability and fault tolerance with failure domains When possible, the control plane machine set spreads the control plane machines across multiple failure domains. This configuration provides high availability and fault tolerance within the control plane. This strategy can help protect the control plane when issues arise within the infrastructure provider. 12.5.1.1. Failure domain platform support and configuration The control plane machine set concept of a failure domain is analogous to existing concepts on cloud providers. Not all platforms support the use of failure domains. Table 12.2. Failure domain support matrix Cloud provider Support for failure domains Provider nomenclature Amazon Web Services (AWS) X Availability Zone (AZ) Microsoft Azure X Azure availability zone VMware vSphere Not applicable The failure domain configuration in the control plane machine set custom resource (CR) is platform-specific. For more information about failure domain parameters in the CR, see the sample failure domain configuration for your provider. Additional resources Sample Amazon Web Services failure domain configuration Sample Microsoft Azure failure domain configuration 12.5.1.2. Balancing control plane machines The control plane machine set balances control plane machines across the failure domains that are specified in the custom resource (CR). When possible, the control plane machine set uses each failure domain equally to ensure appropriate fault tolerance. If there are fewer failure domains than control plane machines, failure domains are selected for reuse alphabetically by name. For clusters with no failure domains specified, all control plane machines are placed within a single failure domain. Some changes to the failure domain configuration cause the control plane machine set to rebalance the control plane machines. For example, if you add failure domains to a cluster with fewer failure domains than control plane machines, the control plane machine set rebalances the machines across all available failure domains. 12.5.2. Recovery of failed control plane machines The Control Plane Machine Set Operator automates the recovery of control plane machines. When a control plane machine is deleted, the Operator creates a replacement with the configuration that is specified in the ControlPlaneMachineSet custom resource (CR). For clusters that use control plane machine sets, you can configure a machine health check. The machine health check deletes unhealthy control plane machines so that they are replaced. Important If you configure a MachineHealthCheck resource for the control plane, set the value of maxUnhealthy to 1 . This configuration ensures that the machine health check takes no action when multiple control plane machines appear to be unhealthy. Multiple unhealthy control plane machines can indicate that the etcd cluster is degraded or that a scaling operation to replace a failed machine is in progress. If the etcd cluster is degraded, manual intervention might be required. If a scaling operation is in progress, the machine health check should allow it to finish. Additional resources Deploying machine health checks 12.5.3. Quorum protection with machine lifecycle hooks For OpenShift Container Platform clusters that use the Machine API Operator, the etcd Operator uses lifecycle hooks for the machine deletion phase to implement a quorum protection mechanism. By using a preDrain lifecycle hook, the etcd Operator can control when the pods on a control plane machine are drained and removed. To protect etcd quorum, the etcd Operator prevents the removal of an etcd member until it migrates that member onto a new node within the cluster. This mechanism allows the etcd Operator precise control over the members of the etcd quorum and allows the Machine API Operator to safely create and remove control plane machines without specific operational knowledge of the etcd cluster. 12.5.3.1. Control plane deletion with quorum protection processing order When a control plane machine is replaced on a cluster that uses a control plane machine set, the cluster temporarily has four control plane machines. When the fourth control plane node joins the cluster, the etcd Operator starts a new etcd member on the replacement node. When the etcd Operator observes that the old control plane machine is marked for deletion, it stops the etcd member on the old node and promotes the replacement etcd member to join the quorum of the cluster. The control plane machine Deleting phase proceeds in the following order: A control plane machine is slated for deletion. The control plane machine enters the Deleting phase. To satisfy the preDrain lifecycle hook, the etcd Operator takes the following actions: The etcd Operator waits until a fourth control plane machine is added to the cluster as an etcd member. This new etcd member has a state of Running but not ready until it receives the full database update from the etcd leader. When the new etcd member receives the full database update, the etcd Operator promotes the new etcd member to a voting member and removes the old etcd member from the cluster. After this transition is complete, it is safe for the old etcd pod and its data to be removed, so the preDrain lifecycle hook is removed. The control plane machine status condition Drainable is set to True . The machine controller attempts to drain the node that is backed by the control plane machine. If draining fails, Drained is set to False and the machine controller attempts to drain the node again. If draining succeeds, Drained is set to True . The control plane machine status condition Drained is set to True . If no other Operators have added a preTerminate lifecycle hook, the control plane machine status condition Terminable is set to True . The machine controller removes the instance from the infrastructure provider. The machine controller deletes the Node object. YAML snippet demonstrating the etcd quorum protection preDrain lifecycle hook apiVersion: machine.openshift.io/v1beta1 kind: Machine metadata: ... spec: lifecycleHooks: preDrain: - name: EtcdQuorumOperator 1 owner: clusteroperator/etcd 2 ... 1 The name of the preDrain lifecycle hook. 2 The hook-implementing controller that manages the preDrain lifecycle hook. Additional resources Lifecycle hooks for the machine deletion phase 12.6. Troubleshooting the control plane machine set Use the information in this section to understand and recover from issues you might encounter. 12.6.1. Checking the control plane machine set custom resource state You can verify the existence and state of the ControlPlaneMachineSet custom resource (CR). Procedure Determine the state of the CR by running the following command: USD oc get controlplanemachineset.machine.openshift.io cluster \ --namespace openshift-machine-api A result of Active indicates that the ControlPlaneMachineSet CR exists and is activated. No administrator action is required. A result of Inactive indicates that a ControlPlaneMachineSet CR exists but is not activated. A result of NotFound indicates that there is no existing ControlPlaneMachineSet CR. steps To use the control plane machine set, you must ensure that a ControlPlaneMachineSet CR with the correct settings for your cluster exists. If your cluster has an existing CR, you must verify that the configuration in the CR is correct for your cluster. If your cluster does not have an existing CR, you must create one with the correct configuration for your cluster. Additional resources Activating the control plane machine set custom resource Creating a control plane machine set custom resource 12.6.2. Adding a missing Azure internal load balancer The internalLoadBalancer parameter is required in both the ControlPlaneMachineSet and control plane Machine custom resources (CRs) for Azure. If this parameter is not preconfigured on your cluster, you must add it to both CRs. For more information about where this parameter is located in the Azure provider specification, see the sample Azure provider specification. The placement in the control plane Machine CR is similar. Procedure List the control plane machines in your cluster by running the following command: USD oc get machines \ -l machine.openshift.io/cluster-api-machine-role==master \ -n openshift-machine-api For each control plane machine, edit the CR by running the following command: USD oc edit machine <control_plane_machine_name> Add the internalLoadBalancer parameter with the correct details for your cluster and save your changes. Edit your control plane machine set CR by running the following command: USD oc edit controlplanemachineset.machine.openshift.io cluster \ -n openshift-machine-api Add the internalLoadBalancer parameter with the correct details for your cluster and save your changes. steps For clusters that use the default RollingUpdate update strategy, the Operator automatically propagates the changes to your control plane configuration. For clusters that are configured to use the OnDelete update strategy, you must replace your control plane machines manually. Additional resources Sample Azure provider specification 12.6.3. Recovering a degraded etcd Operator Certain situations can cause the etcd Operator to become degraded. For example, while performing remediation, the machine health check might delete a control plane machine that is hosting etcd. If the etcd member is not reachable at that time, the etcd Operator becomes degraded. When the etcd Operator is degraded, manual intervention is required to force the Operator to remove the failed member and restore the cluster state. Procedure List the control plane machines in your cluster by running the following command: USD oc get machines \ -l machine.openshift.io/cluster-api-machine-role==master \ -n openshift-machine-api \ -o wide Any of the following conditions might indicate a failed control plane machine: The STATE value is stopped . The PHASE value is Failed . The PHASE value is Deleting for more than ten minutes. Important Before continuing, ensure that your cluster has two healthy control plane machines. Performing the actions in this procedure on more than one control plane machine risks losing etcd quorum and can cause data loss. If you have lost the majority of your control plane hosts, leading to etcd quorum loss, then you must follow the disaster recovery procedure "Restoring to a cluster state" instead of this procedure. Edit the machine CR for the failed control plane machine by running the following command: USD oc edit machine <control_plane_machine_name> Remove the contents of the lifecycleHooks parameter from the failed control plane machine and save your changes. The etcd Operator removes the failed machine from the cluster and can then safely add new etcd members. Additional resources Restoring to a cluster state 12.7. Disabling the control plane machine set The .spec.state field in an activated ControlPlaneMachineSet custom resource (CR) cannot be changed from Active to Inactive . To disable the control plane machine set, you must delete the CR so that it is removed from the cluster. When you delete the CR, the Control Plane Machine Set Operator performs cleanup operations and disables the control plane machine set. The Operator then removes the CR from the cluster and creates an inactive control plane machine set with default settings. 12.7.1. Deleting the control plane machine set To stop managing control plane machines with the control plane machine set on your cluster, you must delete the ControlPlaneMachineSet custom resource (CR). Procedure Delete the control plane machine set CR by running the following command: USD oc delete controlplanemachineset.machine.openshift.io cluster \ -n openshift-machine-api Verification Check the control plane machine set custom resource state. A result of Inactive indicates that the removal and replacement process is successful. A ControlPlaneMachineSet CR exists but is not activated. 12.7.2. Checking the control plane machine set custom resource state You can verify the existence and state of the ControlPlaneMachineSet custom resource (CR). Procedure Determine the state of the CR by running the following command: USD oc get controlplanemachineset.machine.openshift.io cluster \ --namespace openshift-machine-api A result of Active indicates that the ControlPlaneMachineSet CR exists and is activated. No administrator action is required. A result of Inactive indicates that a ControlPlaneMachineSet CR exists but is not activated. A result of NotFound indicates that there is no existing ControlPlaneMachineSet CR. 12.7.3. Re-enabling the control plane machine set To re-enable the control plane machine set, you must ensure that the configuration in the CR is correct for your cluster and activate it. Additional resources Activating the control plane machine set custom resource

Commands:
oc get machine -n openshift-machine-api -l machine.openshift.io/cluster-api-machine-role=master
NAME PHASE TYPE REGION ZONE AGE <infrastructure_id>-master-0 Running m6i.xlarge us-west-1 us-west-1a 5h19m <infrastructure_id>-master-1 Running m6i.xlarge us-west-1 us-west-1b 5h19m <infrastructure_id>-master-2 Running m6i.xlarge us-west-1 us-west-1a 5h19m
No resources found in openshift-machine-api namespace.
oc get controlplanemachineset.machine.openshift.io cluster --namespace openshift-machine-api
oc --namespace openshift-machine-api edit controlplanemachineset.machine.openshift.io cluster
apiVersion: machine.openshift.io/v1 kind: ControlPlaneMachineSet metadata: name: cluster namespace: openshift-machine-api spec: replicas: 3 selector: matchLabels: machine.openshift.io/cluster-api-cluster: <cluster_id> 1 machine.openshift.io/cluster-api-machine-role: master machine.openshift.io/cluster-api-machine-type: master state: Active 2 strategy: type: RollingUpdate 3 template: machineType: machines_v1beta1_machine_openshift_io machines_v1beta1_machine_openshift_io: failureDomains: platform: <platform> 4 <platform_failure_domains> 5 metadata: labels: machine.openshift.io/cluster-api-cluster: <cluster_id> 6 machine.openshift.io/cluster-api-machine-role: master machine.openshift.io/cluster-api-machine-type: master spec: providerSpec: value: <platform_provider_spec> 7
oc get -o jsonpath='{.status.infrastructureName}{"\n"}' infrastructure cluster
oc create -f <control_plane_machine_set>.yaml
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
oc get -o jsonpath='{.status.infrastructureName}{"\n"}' infrastructure cluster
failureDomains: aws: - placement: availabilityZone: <aws_zone_a> 1 subnet: 2 filters: - name: tag:Name values: - <cluster_id>-private-<aws_zone_a> 3 type: Filters 4 - placement: availabilityZone: <aws_zone_b> 5 subnet: filters: - name: tag:Name values: - <cluster_id>-private-<aws_zone_b> 6 type: Filters platform: AWS 7
oc get -o jsonpath='{.status.infrastructureName}{"\n"}' infrastructure cluster
providerSpec: value: ami: id: ami-<ami_id_string> 1 apiVersion: machine.openshift.io/v1beta1 blockDevices: - ebs: 2 encrypted: true iops: 0 kmsKey: arn: "" volumeSize: 120 volumeType: gp3 credentialsSecret: name: aws-cloud-credentials 3 deviceIndex: 0 iamInstanceProfile: id: <cluster_id>-master-profile 4 instanceType: m6i.xlarge 5 kind: AWSMachineProviderConfig 6 loadBalancers: 7 - name: <cluster_id>-int type: network - name: <cluster_id>-ext type: network metadata: creationTimestamp: null metadataServiceOptions: {} placement: 8 region: <region> 9 securityGroups: - filters: - name: tag:Name values: - <cluster_id>-master-sg 10 subnet: {} 11 userDataSecret: name: master-user-data 12
failureDomains: azure: 1 - zone: "1" - zone: "2" - zone: "3" platform: Azure 2
oc get -o jsonpath='{.status.infrastructureName}{"\n"}' infrastructure cluster
providerSpec: value: acceleratedNetworking: true apiVersion: machine.openshift.io/v1beta1 credentialsSecret: name: azure-cloud-credentials 1 namespace: openshift-machine-api diagnostics: {} image: 2 offer: "" publisher: "" resourceID: /resourceGroups/<cluster_id>-rg/providers/Microsoft.Compute/galleries/gallery_<cluster_id>/images/<cluster_id>-gen2/versions/412.86.20220930 3 sku: "" version: "" internalLoadBalancer: <cluster_id>-internal 4 kind: AzureMachineProviderSpec 5 location: <region> 6 managedIdentity: <cluster_id>-identity metadata: creationTimestamp: null name: <cluster_id> networkResourceGroup: <cluster_id>-rg osDisk: 7 diskSettings: {} diskSizeGB: 1024 managedDisk: storageAccountType: Premium_LRS osType: Linux publicIP: false publicLoadBalancer: <cluster_id> 8 resourceGroup: <cluster_id>-rg subnet: <cluster_id>-master-subnet 9 userDataSecret: name: master-user-data 10 vmSize: Standard_D8s_v3 vnet: <cluster_id>-vnet zone: "" 11
providerSpec: value: apiVersion: machine.openshift.io/v1beta1 credentialsSecret: name: vsphere-cloud-credentials 1 diskGiB: 120 2 kind: VSphereMachineProviderSpec 3 memoryMiB: 16384 4 metadata: creationTimestamp: null network: 5 devices: - networkName: <vm_network_name> numCPUs: 4 6 numCoresPerSocket: 4 7 snapshot: "" template: <vm_template_name> 8 userDataSecret: name: master-user-data 9 workspace: datacenter: <vcenter_datacenter_name> 10 datastore: <vcenter_datastore_name> 11 folder: <path_to_vcenter_vm_folder> 12 resourcePool: <vsphere_resource_pool> 13 server: <vcenter_server_ip> 14
oc get machines -l machine.openshift.io/cluster-api-machine-role==master -n openshift-machine-api
oc delete machine -n openshift-machine-api <control_plane_machine_name> 1
oc edit controlplanemachineset.machine.openshift.io cluster -n openshift-machine-api
providerSpec: value: loadBalancers: - name: lk4pj-ext 1 type: network 2 - name: lk4pj-int type: network
providerSpec: value: instanceType: <compatible_aws_instance_type> 1
providerSpec: value: metadataServiceOptions: authentication: Required 1
providerSpec: placement: tenancy: dedicated
providerSpec: value: loadBalancers: - name: lk4pj-ext 1 type: network 2 - name: lk4pj-int type: network
az vm image list --all --offer rh-ocp-worker --publisher redhat -o table
Offer Publisher Sku Urn Version ------------- -------------- ------------------ -------------------------------------------------------------- -------------- rh-ocp-worker RedHat rh-ocp-worker RedHat:rh-ocp-worker:rh-ocpworker:4.8.2021122100 4.8.2021122100 rh-ocp-worker RedHat rh-ocp-worker-gen1 RedHat:rh-ocp-worker:rh-ocp-worker-gen1:4.8.2021122100 4.8.2021122100
az vm image list --all --offer rh-ocp-worker --publisher redhat-limited -o table
Offer Publisher Sku Urn Version ------------- -------------- ------------------ -------------------------------------------------------------- -------------- rh-ocp-worker redhat-limited rh-ocp-worker redhat-limited:rh-ocp-worker:rh-ocp-worker:4.8.2021122100 4.8.2021122100 rh-ocp-worker redhat-limited rh-ocp-worker-gen1 redhat-limited:rh-ocp-worker:rh-ocp-worker-gen1:4.8.2021122100 4.8.2021122100
az vm image show --urn redhat:rh-ocp-worker:rh-ocp-worker:<version>
az vm image show --urn redhat-limited:rh-ocp-worker:rh-ocp-worker:<version>
az vm image terms show --urn redhat:rh-ocp-worker:rh-ocp-worker:<version>
az vm image terms show --urn redhat-limited:rh-ocp-worker:rh-ocp-worker:<version>
az vm image terms accept --urn redhat:rh-ocp-worker:rh-ocp-worker:<version>
az vm image terms accept --urn redhat-limited:rh-ocp-worker:rh-ocp-worker:<version>
providerSpec: value: image: offer: rh-ocp-worker publisher: redhat resourceID: "" sku: rh-ocp-worker type: MarketplaceWithPlan version: 4.8.2021122100
providerSpec: diagnostics: boot: storageAccountType: AzureManaged 1
providerSpec: diagnostics: boot: storageAccountType: CustomerManaged 1 customerManaged: storageAccountURI: https://<storage-account>.blob.core.windows.net 2
oc -n openshift-machine-api get secret <role>-user-data \ 1 --template='{{index .data.userData | base64decode}}' | jq > userData.txt 2
"storage": { "disks": [ 1 { "device": "/dev/disk/azure/scsi1/lun0", 2 "partitions": [ 3 { "label": "lun0p1", 4 "sizeMiB": 1024, 5 "startMiB": 0 } ] } ], "filesystems": [ 6 { "device": "/dev/disk/by-partlabel/lun0p1", "format": "xfs", "path": "/var/lib/lun0p1" } ] }, "systemd": { "units": [ 7 { "contents": "[Unit]\nBefore=local-fs.target\n[Mount]\nWhere=/var/lib/lun0p1\nWhat=/dev/disk/by-partlabel/lun0p1\nOptions=defaults,pquota\n[Install]\nWantedBy=local-fs.target\n", 8 "enabled": true, "name": "var-lib-lun0p1.mount" } ] }
oc -n openshift-machine-api get secret <role>-user-data \ 1 --template='{{index .data.disableTemplating | base64decode}}' | jq > disableTemplating.txt
oc -n openshift-machine-api create secret generic <role>-user-data-x5 \ 1 --from-file=userData=userData.txt --from-file=disableTemplating=disableTemplating.txt
oc --namespace openshift-machine-api edit controlplanemachineset.machine.openshift.io cluster
apiVersion: machine.openshift.io/v1beta1 kind: ControlPlaneMachineSet spec: template: spec: metadata: labels: disk: ultrassd 1 providerSpec: value: ultraSSDCapability: Enabled 2 dataDisks: 3 - nameSuffix: ultrassd lun: 0 diskSizeGB: 4 deletionPolicy: Delete cachingType: None managedDisk: storageAccountType: UltraSSD_LRS userDataSecret: name: <role>-user-data-x5 4
oc get machines
oc debug node/<node-name> -- chroot /host lsblk
StorageAccountType UltraSSD_LRS can be used only when additionalCapabilities.ultraSSDEnabled is set.
failed to create vm <machine_name>: failure sending request for machine <machine_name>: cannot create vm: compute.VirtualMachinesClient#CreateOrUpdate: Failure sending request: StatusCode=400 -- Original Error: Code="BadRequest" Message="Storage Account type 'UltraSSD_LRS' is not supported <more_information_about_why>."
providerSpec: value: osDisk: diskSizeGB: 128 managedDisk: diskEncryptionSet: id: /subscriptions/<subscription_id>/resourceGroups/<resource_group_name>/providers/Microsoft.Compute/diskEncryptionSets/<disk_encryption_set_name> storageAccountType: Premium_LRS
providerSpec: value: acceleratedNetworking: true 1 vmSize: <azure-vm-size> 2
apiVersion: machine.openshift.io/v1beta1 kind: Machine metadata: spec: lifecycleHooks: preDrain: - name: EtcdQuorumOperator 1 owner: clusteroperator/etcd 2
oc get controlplanemachineset.machine.openshift.io cluster --namespace openshift-machine-api
oc get machines -l machine.openshift.io/cluster-api-machine-role==master -n openshift-machine-api
oc edit machine <control_plane_machine_name>
oc edit controlplanemachineset.machine.openshift.io cluster -n openshift-machine-api
oc get machines -l machine.openshift.io/cluster-api-machine-role==master -n openshift-machine-api -o wide
oc edit machine <control_plane_machine_name>
oc delete controlplanemachineset.machine.openshift.io cluster -n openshift-machine-api
oc get controlplanemachineset.machine.openshift.io cluster --namespace openshift-machine-api