Chapter 4. Installing 4.1. Preparing your cluster for OpenShift Virtualization Review this section before you install OpenShift Virtualization to ensure that your cluster meets the requirements. Important You can use any installation method, including user-provisioned, installer-provisioned, or assisted installer, to deploy OpenShift Container Platform. However, the installation method and the cluster topology might affect OpenShift Virtualization functionality, such as snapshots or live migration. Single-node OpenShift differences You can install OpenShift Virtualization on a single-node cluster. See About single-node OpenShift for more information. Single-node OpenShift does not support high availability, which results in the following differences: Pod disruption budgets are not supported. Live migration is not supported. Templates or virtual machines that use data volumes or storage profiles must not have the evictionStrategy set. FIPS mode If you install your cluster in FIPS mode , no additional setup is required for OpenShift Virtualization. IPv6 You cannot run OpenShift Virtualization on a single-stack IPv6 cluster. ( BZ#2193267 ) 4.1.1. Hardware and operating system requirements Review the following hardware and operating system requirements for OpenShift Virtualization. Supported platforms On-premise bare metal servers Amazon Web Services bare metal instances. See Deploy OpenShift Virtualization on AWS Bare Metal Nodes for details. IBM Cloud Bare Metal Servers. See Deploy OpenShift Virtualization on IBM Cloud Bare Metal Nodes for details. Important Installing OpenShift Virtualization on AWS bare metal instances or on IBM Cloud Bare Metal Servers is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope . Bare metal instances or servers offered by other cloud providers are not supported. CPU requirements Supported by Red Hat Enterprise Linux (RHEL) 8 Support for Intel 64 or AMD64 CPU extensions Intel VT or AMD-V hardware virtualization extensions enabled NX (no execute) flag enabled Storage requirements Supported by OpenShift Container Platform Warning If you deploy OpenShift Virtualization with Red Hat OpenShift Data Foundation, you must create a dedicated storage class for Windows virtual machine disks. See Optimizing ODF PersistentVolumes for Windows VMs for details. Operating system requirements Red Hat Enterprise Linux CoreOS (RHCOS) installed on worker nodes Note RHEL worker nodes are not supported. If your cluster uses worker nodes with different CPUs, live migration failures can occur because different CPUs have different capabilities. To avoid such failures, use CPUs with appropriate capacity for each node and set node affinity on your virtual machines to ensure successful migration. See Configuring a required node affinity rule for more information. Additional resources About RHCOS . Red Hat Ecosystem Catalog for supported CPUs. Supported storage . 4.1.2. Physical resource overhead requirements OpenShift Virtualization is an add-on to OpenShift Container Platform and imposes additional overhead that you must account for when planning a cluster. Each cluster machine must accommodate the following overhead requirements in addition to the OpenShift Container Platform requirements. Oversubscribing the physical resources in a cluster can affect performance. Important The numbers noted in this documentation are based on Red Hat's test methodology and setup. These numbers can vary based on your own individual setup and environments. 4.1.2.1. Memory overhead Calculate the memory overhead values for OpenShift Virtualization by using the equations below. Cluster memory overhead Additionally, OpenShift Virtualization environment resources require a total of 2179 MiB of RAM that is spread across all infrastructure nodes. Virtual machine memory overhead 1 Number of virtual CPUs requested by the virtual machine 2 Number of virtual graphics cards requested by the virtual machine If your environment includes a Single Root I/O Virtualization (SR-IOV) network device or a Graphics Processing Unit (GPU), allocate 1 GiB additional memory overhead for each device. 4.1.2.2. CPU overhead Calculate the cluster processor overhead requirements for OpenShift Virtualization by using the equation below. The CPU overhead per virtual machine depends on your individual setup. Cluster CPU overhead OpenShift Virtualization increases the overall utilization of cluster level services such as logging, routing, and monitoring. To account for this workload, ensure that nodes that host infrastructure components have capacity allocated for 4 additional cores (4000 millicores) distributed across those nodes. Each worker node that hosts virtual machines must have capacity for 2 additional cores (2000 millicores) for OpenShift Virtualization management workloads in addition to the CPUs required for virtual machine workloads. Virtual machine CPU overhead If dedicated CPUs are requested, there is a 1:1 impact on the cluster CPU overhead requirement. Otherwise, there are no specific rules about how many CPUs a virtual machine requires. 4.1.2.3. Storage overhead Use the guidelines below to estimate storage overhead requirements for your OpenShift Virtualization environment. Cluster storage overhead 10 GiB is the estimated on-disk storage impact for each node in the cluster when you install OpenShift Virtualization. Virtual machine storage overhead Storage overhead per virtual machine depends on specific requests for resource allocation within the virtual machine. The request could be for ephemeral storage on the node or storage resources hosted elsewhere in the cluster. OpenShift Virtualization does not currently allocate any additional ephemeral storage for the running container itself. 4.1.2.4. Example As a cluster administrator, if you plan to host 10 virtual machines in the cluster, each with 1 GiB of RAM and 2 vCPUs, the memory impact across the cluster is 11.68 GiB. The estimated on-disk storage impact for each node in the cluster is 10 GiB and the CPU impact for worker nodes that host virtual machine workloads is a minimum of 2 cores. 4.1.3. Object maximums You must consider the following tested object maximums when planning your cluster: OpenShift Container Platform object maximums . OpenShift Virtualization object maximums . 4.1.4. Restricted network environments If you install OpenShift Virtualization in a restricted environment with no internet connectivity, you must configure Operator Lifecycle Manager for restricted networks . If you have limited internet connectivity, you can configure proxy support in Operator Lifecycle Manager to access the Red Hat-provided OperatorHub. 4.1.5. Live migration Live migration has the following requirements: Shared storage with ReadWriteMany (RWX) access mode. Sufficient RAM and network bandwidth. If the virtual machine uses a host model CPU, the nodes must support the virtual machine's host model CPU. Note You must ensure that there is enough memory request capacity in the cluster to support node drains that result in live migrations. You can determine the approximate required spare memory by using the following calculation: The default number of migrations that can run in parallel in the cluster is 5. 4.1.6. Snapshots and cloning See OpenShift Virtualization storage features for snapshot and cloning requirements. 4.1.7. Cluster high-availability options You can configure one of the following high-availability (HA) options for your cluster: Automatic high availability for installer-provisioned infrastructure (IPI) is available by deploying machine health checks . Note In OpenShift Container Platform clusters installed using installer-provisioned infrastructure and with MachineHealthCheck properly configured, if a node fails the MachineHealthCheck and becomes unavailable to the cluster, it is recycled. What happens with VMs that ran on the failed node depends on a series of conditions. See About RunStrategies for virtual machines for more detailed information about the potential outcomes and how RunStrategies affect those outcomes. Automatic high availability for both IPI and non-IPI is available by using the Node Health Check Operator on the OpenShift Container Platform cluster to deploy the NodeHealthCheck controller. The controller identifies unhealthy nodes and uses the Self Node Remediation Operator to remediate the unhealthy nodes. Important Node Health Check Operator is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. For more information about the support scope of Red Hat Technology Preview features, see Technology Preview Features Support Scope . High availability for any platform is available by using either a monitoring system or a qualified human to monitor node availability. When a node is lost, shut it down and run oc delete node <lost_node> . Note Without an external monitoring system or a qualified human monitoring node health, virtual machines lose high availability. 4.2. Specifying nodes for OpenShift Virtualization components Specify the nodes where you want to deploy OpenShift Virtualization Operators, workloads, and controllers by configuring node placement rules. Note You can configure node placement for some components after installing OpenShift Virtualization, but there must not be virtual machines present if you want to configure node placement for workloads. 4.2.1. About node placement for virtualization components You might want to customize where OpenShift Virtualization deploys its components to ensure that: Virtual machines only deploy on nodes that are intended for virtualization workloads. Operators only deploy on infrastructure nodes. Certain nodes are unaffected by OpenShift Virtualization. For example, you have workloads unrelated to virtualization running on your cluster, and you want those workloads to be isolated from OpenShift Virtualization. 4.2.1.1. How to apply node placement rules to virtualization components You can specify node placement rules for a component by editing the corresponding object directly or by using the web console. For the OpenShift Virtualization Operators that Operator Lifecycle Manager (OLM) deploys, edit the OLM Subscription object directly. Currently, you cannot configure node placement rules for the Subscription object by using the web console. For components that the OpenShift Virtualization Operators deploy, edit the HyperConverged object directly or configure it by using the web console during OpenShift Virtualization installation. For the hostpath provisioner, edit the HostPathProvisioner object directly or configure it by using the web console. Warning You must schedule the hostpath provisioner and the virtualization components on the same nodes. Otherwise, virtualization pods that use the hostpath provisioner cannot run. Depending on the object, you can use one or more of the following rule types: nodeSelector Allows pods to be scheduled on nodes that are labeled with the key-value pair or pairs that you specify in this field. The node must have labels that exactly match all listed pairs. affinity Enables you to use more expressive syntax to set rules that match nodes with pods. Affinity also allows for more nuance in how the rules are applied. For example, you can specify that a rule is a preference, rather than a hard requirement, so that pods are still scheduled if the rule is not satisfied. tolerations Allows pods to be scheduled on nodes that have matching taints. If a taint is applied to a node, that node only accepts pods that tolerate the taint. 4.2.1.2. Node placement in the OLM Subscription object To specify the nodes where OLM deploys the OpenShift Virtualization Operators, edit the Subscription object during OpenShift Virtualization installation. You can include node placement rules in the spec.config field, as shown in the following example: apiVersion: operators.coreos.com/v1alpha1 kind: Subscription metadata: name: hco-operatorhub namespace: openshift-cnv spec: source: redhat-operators sourceNamespace: openshift-marketplace name: kubevirt-hyperconverged startingCSV: kubevirt-hyperconverged-operator.v4.10.10 channel: "stable" config: 1 1 The config field supports nodeSelector and tolerations , but it does not support affinity . 4.2.1.3. Node placement in the HyperConverged object To specify the nodes where OpenShift Virtualization deploys its components, you can include the nodePlacement object in the HyperConverged Cluster custom resource (CR) file that you create during OpenShift Virtualization installation. You can include nodePlacement under the spec.infra and spec.workloads fields, as shown in the following example: apiVersion: hco.kubevirt.io/v1beta1 kind: HyperConverged metadata: name: kubevirt-hyperconverged namespace: openshift-cnv spec: infra: nodePlacement: 1 ... workloads: nodePlacement: ... 1 The nodePlacement fields support nodeSelector , affinity , and tolerations fields. 4.2.1.4. Node placement in the HostPathProvisioner object You can configure node placement rules in the spec.workload field of the HostPathProvisioner object that you create when you install the hostpath provisioner. apiVersion: hostpathprovisioner.kubevirt.io/v1beta1 kind: HostPathProvisioner metadata: name: hostpath-provisioner spec: imagePullPolicy: IfNotPresent pathConfig: path: "</path/to/backing/directory>" useNamingPrefix: false workload: 1 1 The workload field supports nodeSelector , affinity , and tolerations fields. 4.2.1.5. Additional resources Specifying nodes for virtual machines Placing pods on specific nodes using node selectors Controlling pod placement on nodes using node affinity rules Controlling pod placement using node taints Installing OpenShift Virtualization using the CLI Installing OpenShift Virtualization using the web console Configuring local storage for virtual machines 4.2.2. Example manifests The following example YAML files use nodePlacement , affinity , and tolerations objects to customize node placement for OpenShift Virtualization components. 4.2.2.1. Operator Lifecycle Manager Subscription object 4.2.2.1.1. Example: Node placement with nodeSelector in the OLM Subscription object In this example, nodeSelector is configured so that OLM places the OpenShift Virtualization Operators on nodes that are labeled with example.io/example-infra-key = example-infra-value . apiVersion: operators.coreos.com/v1alpha1 kind: Subscription metadata: name: hco-operatorhub namespace: openshift-cnv spec: source: redhat-operators sourceNamespace: openshift-marketplace name: kubevirt-hyperconverged startingCSV: kubevirt-hyperconverged-operator.v4.10.10 channel: "stable" config: nodeSelector: example.io/example-infra-key: example-infra-value 4.2.2.1.2. Example: Node placement with tolerations in the OLM Subscription object In this example, nodes that are reserved for OLM to deploy OpenShift Virtualization Operators are labeled with the key=virtualization:NoSchedule taint. Only pods with the matching tolerations are scheduled to these nodes. apiVersion: operators.coreos.com/v1alpha1 kind: Subscription metadata: name: hco-operatorhub namespace: openshift-cnv spec: source: redhat-operators sourceNamespace: openshift-marketplace name: kubevirt-hyperconverged startingCSV: kubevirt-hyperconverged-operator.v4.10.10 channel: "stable" config: tolerations: - key: "key" operator: "Equal" value: "virtualization" effect: "NoSchedule" 4.2.2.2. HyperConverged object 4.2.2.2.1. Example: Node placement with nodeSelector in the HyperConverged Cluster CR In this example, nodeSelector is configured so that infrastructure resources are placed on nodes that are labeled with example.io/example-infra-key = example-infra-value and workloads are placed on nodes labeled with example.io/example-workloads-key = example-workloads-value . apiVersion: hco.kubevirt.io/v1beta1 kind: HyperConverged metadata: name: kubevirt-hyperconverged namespace: openshift-cnv spec: infra: nodePlacement: nodeSelector: example.io/example-infra-key: example-infra-value workloads: nodePlacement: nodeSelector: example.io/example-workloads-key: example-workloads-value 4.2.2.2.2. Example: Node placement with affinity in the HyperConverged Cluster CR In this example, affinity is configured so that infrastructure resources are placed on nodes that are labeled with example.io/example-infra-key = example-value and workloads are placed on nodes labeled with example.io/example-workloads-key = example-workloads-value . Nodes that have more than eight CPUs are preferred for workloads, but if they are not available, pods are still scheduled. apiVersion: hco.kubevirt.io/v1beta1 kind: HyperConverged metadata: name: kubevirt-hyperconverged namespace: openshift-cnv spec: infra: nodePlacement: affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: example.io/example-infra-key operator: In values: - example-infra-value workloads: nodePlacement: affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: example.io/example-workloads-key operator: In values: - example-workloads-value preferredDuringSchedulingIgnoredDuringExecution: - weight: 1 preference: matchExpressions: - key: example.io/num-cpus operator: Gt values: - 8 4.2.2.2.3. Example: Node placement with tolerations in the HyperConverged Cluster CR In this example, nodes that are reserved for OpenShift Virtualization components are labeled with the key=virtualization:NoSchedule taint. Only pods with the matching tolerations are scheduled to these nodes. apiVersion: hco.kubevirt.io/v1beta1 kind: HyperConverged metadata: name: kubevirt-hyperconverged namespace: openshift-cnv spec: workloads: nodePlacement: tolerations: - key: "key" operator: "Equal" value: "virtualization" effect: "NoSchedule" 4.2.2.3. HostPathProvisioner object 4.2.2.3.1. Example: Node placement with nodeSelector in the HostPathProvisioner object In this example, nodeSelector is configured so that workloads are placed on nodes labeled with example.io/example-workloads-key = example-workloads-value . apiVersion: hostpathprovisioner.kubevirt.io/v1beta1 kind: HostPathProvisioner metadata: name: hostpath-provisioner spec: imagePullPolicy: IfNotPresent pathConfig: path: "</path/to/backing/directory>" useNamingPrefix: false workload: nodeSelector: example.io/example-workloads-key: example-workloads-value 4.3. Installing OpenShift Virtualization using the web console Install OpenShift Virtualization to add virtualization functionality to your OpenShift Container Platform cluster. You can use the OpenShift Container Platform 4.10 web console to subscribe to and deploy the OpenShift Virtualization Operators. 4.3.1. Installing the OpenShift Virtualization Operator You can install the OpenShift Virtualization Operator from the OpenShift Container Platform web console. Prerequisites Install OpenShift Container Platform 4.10 on your cluster. Log in to the OpenShift Container Platform web console as a user with cluster-admin permissions. Procedure From the Administrator perspective, click Operators OperatorHub . In the Filter by keyword field, type OpenShift Virtualization . Select the OpenShift Virtualization tile. Read the information about the Operator and click Install . On the Install Operator page: Select stable from the list of available Update Channel options. This ensures that you install the version of OpenShift Virtualization that is compatible with your OpenShift Container Platform version. For Installed Namespace , ensure that the Operator recommended namespace option is selected. This installs the Operator in the mandatory openshift-cnv namespace, which is automatically created if it does not exist. Warning Attempting to install the OpenShift Virtualization Operator in a namespace other than openshift-cnv causes the installation to fail. For Approval Strategy , it is highly recommended that you select Automatic , which is the default value, so that OpenShift Virtualization automatically updates when a new version is available in the stable update channel. While it is possible to select the Manual approval strategy, this is inadvisable because of the high risk that it presents to the supportability and functionality of your cluster. Only select Manual if you fully understand these risks and cannot use Automatic . Warning Because OpenShift Virtualization is only supported when used with the corresponding OpenShift Container Platform version, missing OpenShift Virtualization updates can cause your cluster to become unsupported. Click Install to make the Operator available to the openshift-cnv namespace. When the Operator installs successfully, click Create HyperConverged . Optional: Configure Infra and Workloads node placement options for OpenShift Virtualization components. Click Create to launch OpenShift Virtualization. Verification Navigate to the Workloads Pods page and monitor the OpenShift Virtualization pods until they are all Running . After all the pods display the Running state, you can use OpenShift Virtualization. 4.3.2. steps You might want to additionally configure the following components: The hostpath provisioner is a local storage provisioner designed for OpenShift Virtualization. If you want to configure local storage for virtual machines, you must enable the hostpath provisioner first. 4.4. Installing OpenShift Virtualization using the CLI Install OpenShift Virtualization to add virtualization functionality to your OpenShift Container Platform cluster. You can subscribe to and deploy the OpenShift Virtualization Operators by using the command line to apply manifests to your cluster. Note To specify the nodes where you want OpenShift Virtualization to install its components, configure node placement rules . 4.4.1. Prerequisites Install OpenShift Container Platform 4.10 on your cluster. Install the OpenShift CLI ( oc ). Log in as a user with cluster-admin privileges. 4.4.2. Subscribing to the OpenShift Virtualization catalog by using the CLI Before you install OpenShift Virtualization, you must subscribe to the OpenShift Virtualization catalog. Subscribing gives the openshift-cnv namespace access to the OpenShift Virtualization Operators. To subscribe, configure Namespace , OperatorGroup , and Subscription objects by applying a single manifest to your cluster. Procedure Create a YAML file that contains the following manifest: apiVersion: v1 kind: Namespace metadata: name: openshift-cnv --- apiVersion: operators.coreos.com/v1 kind: OperatorGroup metadata: name: kubevirt-hyperconverged-group namespace: openshift-cnv spec: targetNamespaces: - openshift-cnv --- apiVersion: operators.coreos.com/v1alpha1 kind: Subscription metadata: name: hco-operatorhub namespace: openshift-cnv spec: source: redhat-operators sourceNamespace: openshift-marketplace name: kubevirt-hyperconverged startingCSV: kubevirt-hyperconverged-operator.v4.10.10 channel: "stable" 1 1 Using the stable channel ensures that you install the version of OpenShift Virtualization that is compatible with your OpenShift Container Platform version. Create the required Namespace , OperatorGroup , and Subscription objects for OpenShift Virtualization by running the following command: USD oc apply -f <file name>.yaml Note You can configure certificate rotation parameters in the YAML file. 4.4.3. Deploying the OpenShift Virtualization Operator by using the CLI You can deploy the OpenShift Virtualization Operator by using the oc CLI. Prerequisites An active subscription to the OpenShift Virtualization catalog in the openshift-cnv namespace. Procedure Create a YAML file that contains the following manifest: apiVersion: hco.kubevirt.io/v1beta1 kind: HyperConverged metadata: name: kubevirt-hyperconverged namespace: openshift-cnv spec: Deploy the OpenShift Virtualization Operator by running the following command: USD oc apply -f <file_name>.yaml Verification Ensure that OpenShift Virtualization deployed successfully by watching the PHASE of the cluster service version (CSV) in the openshift-cnv namespace. Run the following command: USD watch oc get csv -n openshift-cnv The following output displays if deployment was successful: Example output NAME DISPLAY VERSION REPLACES PHASE kubevirt-hyperconverged-operator.v4.10.10 OpenShift Virtualization 4.10.10 Succeeded 4.4.4. steps You might want to additionally configure the following components: The hostpath provisioner is a local storage provisioner designed for OpenShift Virtualization. If you want to configure local storage for virtual machines, you must enable the hostpath provisioner first. 4.5. Enabling the virtctl client The virtctl client is a command-line utility for managing OpenShift Virtualization resources. It is available for Linux, macOS, and Windows distributions. 4.5.1. Downloading and installing the virtctl client 4.5.1.1. Downloading the virtctl client Download the virtctl client by using the link provided in the ConsoleCLIDownload custom resource (CR). Procedure View the ConsoleCLIDownload object by running the following command: USD oc get ConsoleCLIDownload virtctl-clidownloads-kubevirt-hyperconverged -o yaml Download the virtctl client by using the link listed for your distribution. 4.5.1.2. Installing the virtctl client Extract and install the virtctl client after downloading from the appropriate location for your operating system. Prerequisites You must have downloaded the virtctl client. Procedure For Linux: Extract the tarball. The following CLI command extracts it into the same directory as the tarball: USD tar -xvf <virtctl-version-distribution.arch>.tar.gz Navigate the extracted folder hierachy and run the following command to make the virtctl binary executable: USD chmod +x <virtctl-file-name> Move the virtctl binary to a directory in your PATH environment variable. To check your path, run the following command: USD echo USDPATH For Windows users: Unpack and unzip the archive. Navigate the extracted folder hierarchy and double-click the virtctl executable file to install the client. Move the virtctl binary to a directory in your PATH environment variable. To check your path, run the following command: C:\> path For macOS users: Unpack and unzip the archive. Move the virtctl binary to a directory in your PATH environment variable. To check your path, run the following command: echo USDPATH 4.5.2. Additional setup options 4.5.2.1. Installing the virtctl client using the yum utility Install the virtctl client from the kubevirt-virtctl package. Procedure Install the kubevirt-virtctl package: # yum install kubevirt-virtctl 4.5.2.2. Enabling OpenShift Virtualization repositories Red Hat offers OpenShift Virtualization repositories for both Red Hat Enterprise Linux 8 and Red Hat Enterprise Linux 7: Red Hat Enterprise Linux 8 repository: cnv-4.10-for-rhel-8-x86_64-rpms Red Hat Enterprise Linux 7 repository: rhel-7-server-cnv-4.10-rpms The process for enabling the repository in subscription-manager is the same in both platforms. Procedure Enable the appropriate OpenShift Virtualization repository for your system by running the following command: # subscription-manager repos --enable <repository> 4.5.3. Additional resources Using the CLI tools for OpenShift Virtualization. 4.6. Uninstalling OpenShift Virtualization using the web console You can uninstall OpenShift Virtualization by using the OpenShift Container Platform web console . 4.6.1. Prerequisites You must have OpenShift Virtualization 4.10 installed. You must delete all virtual machines , virtual machine instances , and data volumes . Important Attempting to uninstall OpenShift Virtualization without deleting these objects results in failure. 4.6.2. Deleting the OpenShift Virtualization Operator Deployment custom resource To uninstall OpenShift Virtualization, you must first delete the OpenShift Virtualization Operator Deployment custom resource. Prerequisites Create the OpenShift Virtualization Operator Deployment custom resource. Procedure From the OpenShift Container Platform web console, select openshift-cnv from the Projects list. Navigate to the Operators Installed Operators page. Click OpenShift Virtualization . Click the OpenShift Virtualization Operator Deployment tab. Click the Options menu in the row containing the kubevirt-hyperconverged custom resource. In the expanded menu, click Delete HyperConverged Cluster . Click Delete in the confirmation window. Navigate to the Workloads Pods page to verify that only the Operator pods are running. Open a terminal window and clean up the remaining resources by running the following command: USD oc delete apiservices v1alpha3.subresources.kubevirt.io -n openshift-cnv 4.6.3. Deleting the OpenShift Virtualization catalog subscription To finish uninstalling OpenShift Virtualization, delete the OpenShift Virtualization catalog subscription. Prerequisites An active subscription to the OpenShift Virtualization catalog Procedure Navigate to the Operators OperatorHub page. Search for OpenShift Virtualization and then select it. Click Uninstall . Note You can now delete the openshift-cnv namespace. 4.6.4. Deleting a namespace using the web console You can delete a namespace by using the OpenShift Container Platform web console. Note If you do not have permissions to delete the namespace, the Delete Namespace option is not available. Procedure Navigate to Administration Namespaces . Locate the namespace that you want to delete in the list of namespaces. On the far right side of the namespace listing, select Delete Namespace from the Options menu . When the Delete Namespace pane opens, enter the name of the namespace that you want to delete in the field. Click Delete . 4.7. Uninstalling OpenShift Virtualization using the CLI You can uninstall OpenShift Virtualization by using the OpenShift Container Platform CLI . 4.7.1. Prerequisites You must have OpenShift Virtualization 4.10 installed. You must delete all virtual machines , virtual machine instances , and data volumes . Important Attempting to uninstall OpenShift Virtualization without deleting these objects results in failure. 4.7.2. Deleting OpenShift Virtualization You can delete OpenShift Virtualization by using the CLI. Prerequisites Install the OpenShift CLI ( oc ). Access to a OpenShift Virtualization cluster using an account with cluster-admin permissions. Note When you delete the subscription of the OpenShift Virtualization operator in the OLM by using the CLI, the ClusterServiceVersion (CSV) object is not deleted from the cluster. To completely uninstall OpenShift Virtualization, you must explicitly delete the CSV. Procedure Delete the HyperConverged custom resource: USD oc delete HyperConverged kubevirt-hyperconverged -n openshift-cnv Delete the subscription of the OpenShift Virtualization operator in the Operator Lifecycle Manager (OLM): USD oc delete subscription kubevirt-hyperconverged -n openshift-cnv Set the cluster service version (CSV) name for OpenShift Virtualization as an environment variable: USD CSV_NAME=USD(oc get csv -n openshift-cnv -o=jsonpath="{.items[0].metadata.name}") Delete the CSV from the OpenShift Virtualization cluster by specifying the CSV name from the step: USD oc delete csv USD{CSV_NAME} -n openshift-cnv OpenShift Virtualization is uninstalled when a confirmation message indicates that the CSV was deleted successfully: Example output clusterserviceversion.operators.coreos.com "kubevirt-hyperconverged-operator.v4.10.10" deleted

Commands:
Memory overhead per infrastructure node ~ 150 MiB
Memory overhead per worker node ~ 360 MiB
Memory overhead per virtual machine ~ (1.002 * requested memory) + 146 MiB + 8 MiB * (number of vCPUs) \ 1 + 16 MiB * (number of graphics devices) 2
CPU overhead for infrastructure nodes ~ 4 cores
CPU overhead for worker nodes ~ 2 cores + CPU overhead per virtual machine
Aggregated storage overhead per node ~ 10 GiB
Product of (Maximum number of nodes that can drain in parallel) and (Highest total VM memory request allocations across nodes)
apiVersion: operators.coreos.com/v1alpha1 kind: Subscription metadata: name: hco-operatorhub namespace: openshift-cnv spec: source: redhat-operators sourceNamespace: openshift-marketplace name: kubevirt-hyperconverged startingCSV: kubevirt-hyperconverged-operator.v4.10.10 channel: "stable" config: 1
apiVersion: hco.kubevirt.io/v1beta1 kind: HyperConverged metadata: name: kubevirt-hyperconverged namespace: openshift-cnv spec: infra: nodePlacement: 1 workloads: nodePlacement:
apiVersion: hostpathprovisioner.kubevirt.io/v1beta1 kind: HostPathProvisioner metadata: name: hostpath-provisioner spec: imagePullPolicy: IfNotPresent pathConfig: path: "</path/to/backing/directory>" useNamingPrefix: false workload: 1
apiVersion: operators.coreos.com/v1alpha1 kind: Subscription metadata: name: hco-operatorhub namespace: openshift-cnv spec: source: redhat-operators sourceNamespace: openshift-marketplace name: kubevirt-hyperconverged startingCSV: kubevirt-hyperconverged-operator.v4.10.10 channel: "stable" config: nodeSelector: example.io/example-infra-key: example-infra-value
apiVersion: operators.coreos.com/v1alpha1 kind: Subscription metadata: name: hco-operatorhub namespace: openshift-cnv spec: source: redhat-operators sourceNamespace: openshift-marketplace name: kubevirt-hyperconverged startingCSV: kubevirt-hyperconverged-operator.v4.10.10 channel: "stable" config: tolerations: - key: "key" operator: "Equal" value: "virtualization" effect: "NoSchedule"
apiVersion: hco.kubevirt.io/v1beta1 kind: HyperConverged metadata: name: kubevirt-hyperconverged namespace: openshift-cnv spec: infra: nodePlacement: nodeSelector: example.io/example-infra-key: example-infra-value workloads: nodePlacement: nodeSelector: example.io/example-workloads-key: example-workloads-value
apiVersion: hco.kubevirt.io/v1beta1 kind: HyperConverged metadata: name: kubevirt-hyperconverged namespace: openshift-cnv spec: infra: nodePlacement: affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: example.io/example-infra-key operator: In values: - example-infra-value workloads: nodePlacement: affinity: nodeAffinity: requiredDuringSchedulingIgnoredDuringExecution: nodeSelectorTerms: - matchExpressions: - key: example.io/example-workloads-key operator: In values: - example-workloads-value preferredDuringSchedulingIgnoredDuringExecution: - weight: 1 preference: matchExpressions: - key: example.io/num-cpus operator: Gt values: - 8
apiVersion: hco.kubevirt.io/v1beta1 kind: HyperConverged metadata: name: kubevirt-hyperconverged namespace: openshift-cnv spec: workloads: nodePlacement: tolerations: - key: "key" operator: "Equal" value: "virtualization" effect: "NoSchedule"
apiVersion: hostpathprovisioner.kubevirt.io/v1beta1 kind: HostPathProvisioner metadata: name: hostpath-provisioner spec: imagePullPolicy: IfNotPresent pathConfig: path: "</path/to/backing/directory>" useNamingPrefix: false workload: nodeSelector: example.io/example-workloads-key: example-workloads-value
apiVersion: v1 kind: Namespace metadata: name: openshift-cnv --- apiVersion: operators.coreos.com/v1 kind: OperatorGroup metadata: name: kubevirt-hyperconverged-group namespace: openshift-cnv spec: targetNamespaces: - openshift-cnv --- apiVersion: operators.coreos.com/v1alpha1 kind: Subscription metadata: name: hco-operatorhub namespace: openshift-cnv spec: source: redhat-operators sourceNamespace: openshift-marketplace name: kubevirt-hyperconverged startingCSV: kubevirt-hyperconverged-operator.v4.10.10 channel: "stable" 1
oc apply -f <file name>.yaml
apiVersion: hco.kubevirt.io/v1beta1 kind: HyperConverged metadata: name: kubevirt-hyperconverged namespace: openshift-cnv spec:
oc apply -f <file_name>.yaml
watch oc get csv -n openshift-cnv
NAME DISPLAY VERSION REPLACES PHASE kubevirt-hyperconverged-operator.v4.10.10 OpenShift Virtualization 4.10.10 Succeeded
oc get ConsoleCLIDownload virtctl-clidownloads-kubevirt-hyperconverged -o yaml
tar -xvf <virtctl-version-distribution.arch>.tar.gz
chmod +x <virtctl-file-name>
echo USDPATH
C:\> path
echo USDPATH
yum install kubevirt-virtctl
subscription-manager repos --enable <repository>
oc delete apiservices v1alpha3.subresources.kubevirt.io -n openshift-cnv
oc delete HyperConverged kubevirt-hyperconverged -n openshift-cnv
oc delete subscription kubevirt-hyperconverged -n openshift-cnv
CSV_NAME=USD(oc get csv -n openshift-cnv -o=jsonpath="{.items[0].metadata.name}")
oc delete csv USD{CSV_NAME} -n openshift-cnv
clusterserviceversion.operators.coreos.com "kubevirt-hyperconverged-operator.v4.10.10" deleted