OpenShift Virtualization
OpenShift Virtualization installation, usage, and release notes
Abstract
Chapter 1. About OpenShift Virtualization
Learn about OpenShift Virtualization’s capabilities and support scope.
1.1. What you can do with OpenShift Virtualization
OpenShift Virtualization is an add-on to OpenShift Container Platform that allows you to run and manage virtual machine workloads alongside container workloads.
OpenShift Virtualization adds new objects into your OpenShift Container Platform cluster via Kubernetes custom resources to enable virtualization tasks. These tasks include:
- Creating and managing Linux and Windows virtual machines
- Connecting to virtual machines through a variety of consoles and CLI tools
- Importing and cloning existing virtual machines
- Managing network interface controllers and storage disks attached to virtual machines
- Live migrating virtual machines between nodes
An enhanced web console provides a graphical portal to manage these virtualized resources alongside the OpenShift Container Platform cluster containers and infrastructure.
OpenShift Virtualization is tested with OpenShift Container Storage (OCS) and designed to use with OCS features for the best experience.
You can use OpenShift Virtualization with either the OVN-Kubernetes or the OpenShiftSDN default Container Network Interface (CNI) network provider.
1.1.1. OpenShift Virtualization supported cluster version
OpenShift Virtualization 2.6 is supported for use on OpenShift Container Platform 4.7 clusters. To use the latest z-stream release of OpenShift Virtualization, you must first upgrade to the latest version of OpenShift Container Platform.
Chapter 2. OpenShift Virtualization release notes
2.1. About Red Hat OpenShift Virtualization
Red Hat OpenShift Virtualization enables you to bring traditional virtual machines (VMs) into OpenShift Container Platform where they run alongside containers, and are managed as native Kubernetes objects.
OpenShift Virtualization is represented by the logo.
You can use OpenShift Virtualization with either the OVN-Kubernetes or the OpenShiftSDN default Container Network Interface (CNI) network provider.
Learn more about what you can do with OpenShift Virtualization.
2.1.1. OpenShift Virtualization supported cluster version
OpenShift Virtualization 2.6 is supported for use on OpenShift Container Platform 4.7 clusters. To use the latest z-stream release of OpenShift Virtualization, you must first upgrade to the latest version of OpenShift Container Platform.
2.1.2. Supported guest operating systems
OpenShift Virtualization guests can use the following operating systems:
- Red Hat Enterprise Linux 6, 7, and 8.
- Microsoft Windows Server 2012 R2, 2016, and 2019.
- Microsoft Windows 10.
Other operating system templates shipped with OpenShift Virtualization are not supported.
2.2. Making open source more inclusive
Red Hat is committed to replacing problematic language in our code, documentation, and web properties. We are beginning with these four terms: master, slave, blacklist, and whitelist. Because of the enormity of this endeavor, these changes will be implemented gradually over several upcoming releases. For more details, see our CTO Chris Wright’s message.
2.3. New and changed features
OpenShift Virtualization is certified in Microsoft’s Windows Server Virtualization Validation Program (SVVP) to run Windows Server workloads.
The SVVP Certification applies to:
- Red Hat Enterprise Linux CoreOS workers. In the Microsoft SVVP Catalog, they are named Red Hat OpenShift Container Platform 4 on RHEL CoreOS.
- Intel and AMD CPUs.
-
Virtual machines that have the
LiveMigratable
condition set toTrue
and thespec.evictionStrategy
field set toLiveMigrate
are now migrated when a node is drained in preparation for maintenance. You can set a node to maintenance mode in the CLI by running theoc adm drain
command. You can now boot a virtual machine (VM) in Extensible Firmware Interface (EFI) mode.
NoteOpenShift Virtualization only supports a VM with Secure Boot when using EFI mode. If Secure Boot is not enabled, the VM crashes repeatedly. However, the VM might not support Secure Boot. Before you boot a VM, verify that it supports Secure Boot by checking the VM settings.
2.3.1. Installation
- Cluster administrators can now configure node placement rules for OpenShift Virtualization components, including the hostpath provisioner.
2.3.2. Storage
-
When you add a virtual machine disk to a persistent volume claim (PVC) that uses the
Filesystem
volume mode, the Containerized Data Importer (CDI) now reserves 5.5% of the PVC space for file system overhead. If the default value is not ideal for your use case, you can change the percentage that CDI reserves for this purpose. -
When preparing local storage for a virtual machine disk image, a volume might be allocated from a different node than is required by the virtual machine. To prevent scheduling problems, the Containerized Data Importer now integrates with the Kubernetes
WaitForFirstConsumer
binding mode to ensure that volumes are allocated from the correct node. - The Containerized Data Importer can now preallocate disk space to import and upload data and create blank data volumes at a faster speed.
You can now control which network the Containerized Data Importer (CDI) uses when importing virtual machine disk images by adding the following annotation to the
metadata.annotations
field of aDataVolume
object:k8s.v1.cni.cncf.io/networks: <network_name>
- If you use this annotation, the transfer pod will use both the default network from the cluster and the secondary Multus network.
2.3.3. Web console
- The virtual machine wizard has been redesigned to simplify the process of creating virtual machines by using preconfigured virtual machine templates.
- When you create a virtual machine template with the interactive wizard, selecting the Operating System will automatically select the default Flavor and Workload Type for that operating system. Virtual machines created from a virtual machine template now have these details automatically selected.
2.4. Notable technical changes
-
The procedure for installing OpenShift Virtualization in the web console has been streamlined. You can now create the
HyperConverged
custom resource immediately after installing the OpenShift Virtualization Operator by clicking Create HyperConverged. -
Previously, there was a
spec.BareMetalPlatform
field in theHyperConverged
object. This field has been removed. -
The Containerized Data Importer (CDI) configuration parameters have moved from the
CDIConfig
object to theCDI
object. All changes to the CDI configuration must now be made in thespec.config
field of theCDI
object. Istio sidecar injection to transfer pods is now disabled by default. You can override the default option by using the following annotation in the
metadata.annotations
field of aDataVolume
object:sidecar.istio.io/inject: “true”
- Set this option to enable sidecar injection to the transfer pods.
2.5. Known issues
-
A virtual machine instance (VMI) fails to migrate if the
cdrom
drive is set toreadonly: true
in the VMI spec. The following message is displayed:Operation not supported: Cannot migrate empty or read-only disk sdb
. (BZ#1927378) Some Containerized Data Importer (CDI) operations are currently not preallocated when requested. These include:
- Creating blank block disks
- Importing VMWare disk images
If a cloning operation is initiated before the source is available to be cloned, the operation stalls indefinitely. This is because the clone authorization expires before the cloning operation starts. (BZ#1855182)
-
As a workaround, delete the
DataVolume
object that is requesting the clone. When the source is available, recreate theDataVolume
object that you deleted so that the cloning operation can complete successfully.
-
As a workaround, delete the
- The Containerized Data Importer and KubeVirt depend on QEMU which does not support NFS version 3. Therefore, only NFS version 4 is supported. (BZ#1892445)
The name of the Fedora PVC in the
openshift-virtualization-os-images
namespace isfedora
, instead offedora32
. If you populated thefedora32
PVC in OpenShift Virtualization 2.5 or earlier, the virtual machine does not appear in the web console and you cannot use it to clone another virtual machine. (BZ#1913352)-
As a workaround, upload a Fedora image by naming the PVC
fedora
instead offedora32
.
-
As a workaround, upload a Fedora image by naming the PVC
When creating a HPP boot source, the data volume is
pending
with aWaitForFirstConsumer
status if a user creates the boot source using any method except the Upload local file (creates PVC) option. (BZ#1929177)As a workaround, in the Storage → Persistent Volume Claims web console screen, edit the YAML of the underlying PVC of the data volume to add the
cdi.kubevirt.io/storage.bind.immediate.requested: "true"
annotation:metadata: annotations: cdi.kubevirt.io/storage.bind.immediate.requested: "true"
If you use a Fedora image as a boot source, it is no longer attached to a template if the PVC that you used to attach the boot source was previously provisioned. (BZ#1907187) (BZ#1913352)
-
As a workaround, attach a new PVC with the name
fedora
to a template before using it to create virtual machines from boot sources.
-
As a workaround, attach a new PVC with the name
If your OpenShift Container Platform cluster uses OVN-Kubernetes as the default Container Network Interface (CNI) provider, you cannot attach a Linux bridge or bonding to the default interface of a host because of a change in the host network topology of OVN-Kubernetes. (BZ#1885605)
- As a workaround, you can use a secondary network interface connected to your host, or switch to the OpenShift SDN default CNI provider.
Running virtual machines that cannot be live migrated might block an OpenShift Container Platform cluster upgrade. This includes virtual machines that use hostpath-provisioner storage or SR-IOV network interfaces. (BZ#1858777)
As a workaround, you can reconfigure the virtual machines so that they can be powered off during a cluster upgrade. In the
spec
section of the virtual machine configuration file:-
Remove the
evictionStrategy: LiveMigrate
field. See Configuring virtual machine eviction strategy for more information on how to configure eviction strategy. -
Set the
runStrategy
field toAlways
.
-
Remove the
Live migration fails when nodes have different CPU models. Even in cases where nodes have the same physical CPU model, differences introduced by microcode updates have the same effect. This is because the default settings trigger host CPU passthrough behavior, which is incompatible with live migration. (BZ#1760028)
As a workaround, set the default CPU model in the
kubevirt-config
config map, as shown in the following example:NoteYou must make this change before starting the virtual machines that support live migration.
Open the
kubevirt-config
config map for editing by running the following command:$ oc edit configmap kubevirt-config -n openshift-cnv
Edit the config map:
kind: ConfigMap metadata: name: kubevirt-config data: default-cpu-model: "<cpu-model>" 1
- 1
- Replace
<cpu-model>
with the actual CPU model value. You can determine this value by runningoc describe node <node>
for all nodes and looking at thecpu-model-<name>
labels. Select the CPU model that is present on all of your nodes.
If you enter the wrong credentials for the RHV Manager while importing a RHV VM, the Manager might lock the admin user account because the
vm-import-operator
tries repeatedly to connect to the RHV API. (BZ#1887140)To unlock the account, log in to the Manager and enter the following command:
$ ovirt-aaa-jdbc-tool user unlock admin
Chapter 3. Installing OpenShift Virtualization
3.1. Preparing your cluster for OpenShift Virtualization
Review this section before you install OpenShift Virtualization to ensure that your cluster meets the requirements.
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.
FIPS mode
If you install your cluster in FIPS mode, no additional setup is required for OpenShift Virtualization.
3.1.1. 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
Installing OpenShift Virtualization on an AWS bare metal instance 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 https://access.redhat.com/support/offerings/techpreview/.
- 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
Operating system requirements
Red Hat Enterprise Linux CoreOS (RHCOS) installed on worker nodes
NoteRHEL worker nodes are not supported.
Additional resources
- About RHCOS
- Red Hat Ecosystem Catalog for supported CPUs
- Supported storage
3.1.2. 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.
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.
3.1.2.1. Memory overhead
Calculate the memory overhead values for OpenShift Virtualization by using the equations below.
Cluster memory overhead
Memory overhead per infrastructure node ≈ 150 MiB
Memory overhead per worker node ≈ 360 MiB
Additionally, OpenShift Virtualization environment resources require a total of 2179 MiB of RAM that is spread across all infrastructure nodes.
Virtual machine memory overhead
Memory overhead per virtual machine ≈ (1.002 * requested memory) + 146 MiB \ + 8 MiB * (number of vCPUs) \ 1 + 16 MiB * (number of graphics devices) 2
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.
3.1.2.2. 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
CPU overhead for infrastructure nodes ≈ 4 cores
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.
CPU overhead for worker nodes ≈ 2 cores + CPU overhead per virtual machine
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.
3.1.2.3. Storage overhead
Use the guidelines below to estimate storage overhead requirements for your OpenShift Virtualization environment.
Cluster storage overhead
Aggregated storage overhead per node ≈ 10 GiB
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.
3.1.2.4. 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.
3.1.3. Object maximums
You must consider the following tested object maximums when planning your cluster:
3.1.4. 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.
3.1.5. Live migration
Live migration has the following requirements:
-
Shared storage with
ReadWriteMany
(RWX) access mode - Sufficient RAM and network bandwidth
- Appropriate CPUs with sufficient capacity on the worker nodes. If the CPUs have different capacities, live migration might be very slow or fail.
3.1.6. Snapshots and cloning
See OpenShift Virtualization storage features for snapshot and cloning requirements.
3.1.7. Cluster high-availability
Automatic high availability for installer-provisioned infrastructure (IPI) is available by deploying machine health checks.
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 next 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.
3.2. 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.
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.
3.2.1. 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.
3.2.1.1. 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 theSubscription
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.WarningYou 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.
3.2.1.2. 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.v2.6.10
channel: "stable"
config: 1
- 1
- The
config
field supportsnodeSelector
andtolerations
, but it does not supportaffinity
.
3.2.1.3. 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 supportnodeSelector
,affinity
, andtolerations
fields.
3.2.1.4. 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 supportsnodeSelector
,affinity
, andtolerations
fields.
3.2.1.5. Additional resources
- 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
3.2.2. Example manifests
The following example YAML files use nodePlacement
, affinity
, and tolerations
objects to customize node placement for OpenShift Virtualization components.
3.2.2.1. Operator Lifecycle Manager Subscription object
3.2.2.1.1. 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.v2.6.10 channel: "stable" config: nodeSelector: example.io/example-infra-key: example-infra-value
3.2.2.1.2. 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.v2.6.10 channel: "stable" config: tolerations: - key: "key" operator: "Equal" value: "virtualization" effect: "NoSchedule"
3.2.2.2. HyperConverged object
3.2.2.2.1. 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
3.2.2.2.2. 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
3.2.2.2.3. 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"
3.2.2.3. HostPathProvisioner object
3.2.2.3.1. 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
3.3. 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 4.7 web console to subscribe to and deploy the OpenShift Virtualization Operators.
3.3.1. Installing the OpenShift Virtualization Operator
You can install the OpenShift Virtualization Operator from the OpenShift Container Platform web console.
Prerequisites
- Install OpenShift Container Platform 4.7 on your cluster.
-
Log in to the OpenShift Container Platform web console as a user with
cluster-admin
permissions.
Procedure
- Open a browser window and log in to the OpenShift Container Platform web console.
- 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.
- When you update OpenShift Container Platform, OpenShift Virtualization automatically updates to the next minor 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.WarningAttempting to install the OpenShift Virtualization Operator in a namespace other than
openshift-cnv
causes the installation to fail.- For Approval Strategy, ensure that Automatic, which is the default value, is selected. OpenShift Virtualization automatically updates when a new z-stream release is available.
-
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.
3.3.2. Next steps
You might want to additionally configure the following components:
- The KubeMacPool component provides a MAC address pool service for virtual machine NICs in designated namespaces. Enable a MAC address pool in a namespace by applying the KubeMacPool label to that namespace.
- 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.
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.
To specify the nodes where you want OpenShift Virtualization to install its components, configure node placement rules.
3.3.3. Prerequisites
- Install OpenShift Container Platform 4.7 on your cluster.
-
Install the OpenShift CLI (
oc
). -
Log in as a user with
cluster-admin
privileges.
3.3.4. 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.v2.6.10 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
, andSubscription
objects for OpenShift Virtualization by running the following command:$ oc apply -f <file name>.yaml
3.3.5. 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:
$ oc apply -f <file_name>.yaml
Verification
Ensure that OpenShift Virtualization deployed successfully by watching the
PHASE
of the cluster service version (CSV) in theopenshift-cnv
namespace. Run the following command:$ 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.v2.6.10 OpenShift Virtualization 2.6.10 Succeeded
3.3.6. Next steps
You might want to additionally configure the following components:
- The KubeMacPool component provides a MAC address pool service for virtual machine NICs in designated namespaces. Enable a MAC address pool in a namespace by applying the KubeMacPool label to that namespace.
- 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.
3.4. Installing 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.
You can install the virtctl
client from the OpenShift Virtualization web console or by enabling the OpenShift Virtualization repository and installing the kubevirt-virtctl
package.
3.4.1. Installing the virtctl client from the web console
You can download the virtctl
client from the Red Hat Customer Portal, which is linked to in your OpenShift Virtualization web console in the Command Line Tools page.
Prerequisites
- You must have an activated OpenShift Container Platform subscription to access the download page on the Customer Portal.
Procedure
- Access the Customer Portal by clicking the icon, which is in the upper-right corner of the web console, and selecting Command Line Tools.
- Ensure you have the appropriate version for your cluster selected from the Version: list.
-
Download the
virtctl
client for your distribution. All downloads are intar.gz
format. Extract the tarball. The following CLI command extracts it into the same directory as the tarball and is applicable for all distributions:
$ tar -xvf <virtctl-version-distribution.arch>.tar.gz
For Linux and macOS:
Navigate the extracted folder hierachy and make the
virtctl
binary executable:$ chmod +x <virtctl-file-name>
Move the
virtctl
binary to a directory on your PATH.To check your path, run:
$ echo $PATH
For Windows users:
-
Navigate the extracted folder hierarchy and double-click the
virtctl
executable file to install the client.
-
Navigate the extracted folder hierarchy and double-click the
3.4.2. 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-2.6-for-rhel-8-x86_64-rpms
-
Red Hat Enterprise Linux 7 repository:
rhel-7-server-cnv-2.6-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>
3.4.3. Installing the virtctl client
Install the virtctl
client from the kubevirt-virtctl
package.
Procedure
Install the
kubevirt-virtctl
package:# yum install kubevirt-virtctl
3.4.4. Additional resources
- Using the CLI tools for OpenShift Virtualization.
3.5. Uninstalling OpenShift Virtualization using the web console
You can uninstall OpenShift Virtualization by using the OpenShift Container Platform web console.
3.5.1. Prerequisites
- You must have OpenShift Virtualization 2.6 installed.
You must delete all virtual machines, virtual machine instances, and data volumes.
ImportantAttempting to uninstall OpenShift Virtualization without deleting these objects results in failure.
3.5.2. 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:
$ oc delete apiservices v1alpha3.subresources.kubevirt.io -n openshift-cnv
3.5.3. 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.
You can now delete the openshift-cnv
namespace.
3.5.4. Deleting a namespace using the web console
You can delete a namespace by using the OpenShift Container Platform web console.
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.
3.6. Uninstalling OpenShift Virtualization using the CLI
You can uninstall OpenShift Virtualization by using the OpenShift Container Platform CLI.
3.6.1. Prerequisites
- You must have OpenShift Virtualization 2.6 installed.
You must delete all virtual machines, virtual machine instances, and data volumes.
ImportantAttempting to uninstall OpenShift Virtualization without deleting these objects results in failure.
3.6.2. 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.
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:$ oc delete HyperConverged kubevirt-hyperconverged -n openshift-cnv
Delete the subscription of the OpenShift Virtualization operator in the Operator Lifecycle Manager (OLM):
$ oc delete subscription kubevirt-hyperconverged -n openshift-cnv
Set the cluster service version (CSV) name for OpenShift Virtualization as an environment variable:
$ CSV_NAME=$(oc get csv -n openshift-cnv -o=custom-columns=:metadata.name)
Delete the CSV from the OpenShift Virtualization cluster by specifying the CSV name from the previous step:
$ oc delete csv ${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.v2.6.10" deleted
Chapter 4. Upgrading OpenShift Virtualization
You can manually upgrade to the next minor version of OpenShift Virtualization and monitor the status of an update by using the web console.
4.1. About upgrading OpenShift Virtualization
4.1.1. How OpenShift Virtualization upgrades work
- You can upgrade to the next minor version of OpenShift Virtualization by using the OpenShift Container Platform web console to change the channel of your Operator subscription.
- You can enable automatic z-stream updates during OpenShift Virtualization installation.
- Updates are delivered via the Marketplace Operator, which is deployed during OpenShift Container Platform installation. The Marketplace Operator makes external Operators available to your cluster.
- The amount of time an update takes to complete depends on your network connection. Most automatic updates complete within fifteen minutes.
4.1.2. How OpenShift Virtualization upgrades affect your cluster
Upgrading does not interrupt virtual machine workloads.
Virtual machine pods are not restarted or migrated during an upgrade. If you need to update the
virt-launcher
pod, you must restart or live migrate the virtual machine.NoteEach virtual machine has a
virt-launcher
pod that runs the virtual machine instance. Thevirt-launcher
pod runs an instance oflibvirt
, which is used to manage the virtual machine process.
- Upgrading does not interrupt network connections.
Data volumes and their associated persistent volume claims are preserved during upgrade.
ImportantIf you have virtual machines running that cannot be live migrated, they might block an OpenShift Container Platform cluster upgrade. This includes virtual machines that use hostpath provisioner storage or SR-IOV network interfaces.
As a workaround, you can reconfigure the virtual machines so that they can be powered off automatically during a cluster upgrade. Remove the
evictionStrategy: LiveMigrate
field and set therunStrategy
field toAlways
.
4.2. Upgrading OpenShift Virtualization to the next minor version
You can manually upgrade OpenShift Virtualization to the next minor version by using the OpenShift Container Platform web console to change the channel of your Operator subscription.
Prerequisites
-
Log in to the cluster as a user with the
cluster-admin
role.
Procedure
- Access the OpenShift Container Platform web console and navigate to Operators → Installed Operators.
- Click OpenShift Virtualization to open the Operator Details page.
- Click the Subscription tab to open the Subscription Overview page.
- In the Channel pane, click the pencil icon on the right side of the version number to open the Change Subscription Update Channel window.
- Select stable. This ensures that you install the version of OpenShift Virtualization that is compatible with your OpenShift Container Platform version.
- Click Save.
Check the status of the upgrade by navigating to Operators → Installed Operators. You can also check the status by running the following
oc
command:$ oc get csv -n openshift-cnv
4.3. Monitoring upgrade status
The best way to monitor OpenShift Virtualization upgrade status is to watch the cluster service version (CSV) PHASE
. You can also monitor the CSV conditions in the web console or by running the command provided here.
The PHASE
and conditions values are approximations that are based on available information.
Prerequisites
-
Log in to the cluster as a user with the
cluster-admin
role. -
Install the OpenShift CLI (
oc
).
Procedure
Run the following command:
$ oc get csv
Review the output, checking the
PHASE
field. For example:Example output
VERSION REPLACES PHASE 2.5.0 kubevirt-hyperconverged-operator.v2.4.3 Installing 2.4.3 Replacing
Optional: Monitor the aggregated status of all OpenShift Virtualization component conditions by running the following command:
$ oc get hco -n openshift-cnv kubevirt-hyperconverged \ -o=jsonpath='{range .status.conditions[*]}{.type}{"\t"}{.status}{"\t"}{.message}{"\n"}{end}'
A successful upgrade results in the following output:
Example output
ReconcileComplete True Reconcile completed successfully Available True Reconcile completed successfully Progressing False Reconcile completed successfully Degraded False Reconcile completed successfully Upgradeable True Reconcile completed successfully
4.4. Additional resources
Chapter 5. Additional security privileges granted for kubevirt-controller and virt-launcher
The kubevirt-controller
and virt-launcher pods are granted some SELinux policies and Security Context Constraints privileges that are in addition to typical pod owners. These privileges enable virtual machines to use OpenShift Virtualization features.
5.1. Extended SELinux policies for virt-launcher pods
The container_t
SELinux policy for virt-launcher pods is extended with the following rules:
-
allow process self (tun_socket (relabelfrom relabelto attach_queue))
-
allow process sysfs_t (file (write))
-
allow process hugetlbfs_t (dir (add_name create write remove_name rmdir setattr))
-
allow process hugetlbfs_t (file (create unlink))
These rules enable the following virtualization features:
- Relabel and attach queues to its own TUN sockets, which is required to support network multi-queue. Multi-queue enables network performance to scale as the number of available vCPUs increases.
-
Allows virt-launcher pods to write information to sysfs (
/sys
) files, which is required to enable Single Root I/O Virtualization (SR-IOV). -
Read/write
hugetlbfs
entries, which is required to support huge pages. Huge pages are a method of managing large amounts of memory by increasing the memory page size.
5.2. Additional OpenShift Container Platform security context constraints and Linux capabilities for the kubevirt-controller service account
Security context constraints (SCCs) control permissions for pods. These permissions include actions that a pod, a collection of containers, can perform and what resources it can access. You can use SCCs to define a set of conditions that a pod must run with to be accepted into the system.
The kubevirt-controller
is a cluster controller that creates the virt-launcher pods for virtual machines in the cluster. These virt-launcher pods are granted permissions by the kubevirt-controller
service account.
5.2.1. Additional SCCs granted to the kubevirt-controller service account
The kubevirt-controller
service account is granted additional SCCs and Linux capabilities so that it can create virt-launcher pods with the appropriate permissions. These extended permissions allow virtual machines to take advantage of OpenShift Virtualization features that are beyond the scope of typical pods.
The kubevirt-controller
service account is granted the following SCCs:
-
scc.AllowHostDirVolumePlugin = true
This allows virtual machines to use the hostpath volume plug-in. -
scc.AllowPrivilegedContainer = false
This ensures the virt-launcher pod is not run as a privileged container. -
scc.AllowedCapabilities = []corev1.Capability{"NET_ADMIN", "NET_RAW", "SYS_NICE"}
This provides the following additional Linux capabilitiesNET_ADMIN
,NET_RAW
, andSYS_NICE
.
5.2.2. Viewing the SCC and RBAC definitions for the kubevirt-controller
You can view the SecurityContextConstraints
definition for the kubevirt-controller
by using the oc
tool:
$ oc get scc kubevirt-controller -o yaml
You can view the RBAC definition for the kubevirt-controller
clusterrole by using the oc
tool:
$ oc get clusterrole kubevirt-controller -o yaml
5.3. Additional resources
- The Red Hat Enterprise Linux Virtualization Tuning and Optimization Guide has more information on network multi-queue and huge pages.
-
The
capabilities
man page has more information on the Linux capabilities. -
The
sysfs(5)
man page has more information on sysfs. - The OpenShift Container Platform Authentication guide has more information on Security Context Constraints.
Chapter 6. Using the CLI tools
The two primary CLI tools used for managing resources in the cluster are:
-
The OpenShift Virtualization
virtctl
client -
The OpenShift Container Platform
oc
client
6.1. Prerequisites
-
You must install the
virtctl
client.
6.2. Virtctl client commands
The virtctl
client is a command-line utility for managing OpenShift Virtualization resources. The following table contains the virtctl
commands used throughout the OpenShift Virtualization documentation.
To view a list of options that you can use with a command, run it with the -h
or --help
flag. For example:
$ virtctl image-upload -h
Command | Description |
---|---|
| Start a virtual machine. |
| Stop a virtual machine. |
| Pause a virtual machine or virtual machine instance. The machine state is kept in memory. |
| Unpause a virtual machine or virtual machine instance. |
| Migrate a virtual machine. |
| Restart a virtual machine. |
| Create a service that forwards a designated port of a virtual machine or virtual machine instance and expose the service on the specified port of the node. |
| Connect to a serial console of a virtual machine instance. |
| Open a VNC connection to a virtual machine instance. |
| Upload a virtual machine image to a data volume that already exists. |
| Upload a virtual machine image to a new data volume. |
| Display the client and server version information. |
|
Display a descriptive list of |
| Return a full list of file systems available on the guest machine. |
| Return guest agent information about the operating system. |
| Return a full list of logged-in users on the guest machine. |
6.3. OpenShift Container Platform client commands
The OpenShift Container Platform oc
client is a command-line utility for managing OpenShift Container Platform resources, including the VirtualMachine
(vm
) and VirtualMachineInstance
(vmi
) object types.
You can use the -n <namespace>
flag to specify a different project.
Command | Description |
---|---|
|
Log in to the OpenShift Container Platform cluster as |
| Display a list of objects for the specified object type in the current project. |
| Display details of the specific resource in the current project. |
| Create a resource in the current project from a file name or from stdin. |
| Edit a resource in the current project. |
| Delete a resource in the current project. |
For more comprehensive information on oc
client commands, see the OpenShift Container Platform CLI tools documentation.
Chapter 7. Virtual machines
7.1. Creating virtual machines
Use one of these procedures to create a virtual machine:
- Quick Start guided tour
- Running the wizard
- Pasting a pre-configured YAML file with the virtual machine wizard
- Using the CLI
- Importing a VMware virtual machine or template with the virtual machine wizard
Do not create virtual machines in openshift-*
namespaces. Instead, create a new namespace or use an existing namespace without the openshift
prefix.
When you create virtual machines from the web console, select a virtual machine template that is configured with a boot source. Virtual machine templates with a boot source are labeled as Available boot source or they display a customized label text. Using templates with an available boot source expedites the process of creating virtual machines.
Templates without a boot source are labeled as Boot source required. You can use these templates if you complete the steps for adding a boot source to the virtual machine.
7.1.1. Using a Quick Start to create a virtual machine
The web console provides Quick Starts with instructional guided tours for creating virtual machines. You can access the Quick Starts catalog by selecting the Help menu in the Administrator perspective to view the Quick Starts catalog. When you click on a Quick Start tile and begin the tour, the system guides you through the process.
Tasks in a Quick Start begin with selecting a Red Hat template. Then, you can add a boot source and import the operating system image. Finally, you can save the custom template and use it to create a virtual machine.
Prerequisites
- Access to the website where you can download the URL link for the operating system image.
Procedure
- In the web console, select Quick Starts from the Help menu.
- Click on a tile in the Quick Starts catalog. For example: Creating a Red Hat Linux Enterprise Linux virtual machine.
- Follow the instructions in the guided tour and complete the tasks for importing an operating system image and creating a virtual machine. The Virtual Machines tab displays the virtual machine.
7.1.2. Running the virtual machine wizard to create a virtual machine
The web console features a wizard that guides you through the process of selecting a virtual machine template and creating a virtual machine. Red Hat virtual machine templates are preconfigured with an operating system image, default settings for the operating system, flavor (CPU and memory), and workload type (server). When templates are configured with a boot source, they are labeled with a customized label text or the default label text Available boot source. These templates are then ready to be used for creating virtual machines.
You can select a template from the list of preconfigured templates, review the settings, and create a virtual machine in the Create virtual machine from template wizard. If you choose to customize your virtual machine, the wizard guides you through the General, Networking, Storage, Advanced, and Review steps. All required fields displayed by the wizard are marked by a *.
Create network interface controllers (NICs) and storage disks later and attach them to virtual machines.
Procedure
- Click Workloads → Virtualization from the side menu.
- From the Virtual Machines tab or the Templates tab, click Create and select Virtual Machine with Wizard.
- Select a template that is configured with a boot source.
- Click Next to go to the Review and create step.
- Clear the Start this virtual machine after creation checkbox if you do not want to start the virtual machine now.
- Click Create virtual machine and exit the wizard or continue with the wizard to customize the virtual machine.
Click Customize virtual machine to go to the General step.
- Optional: Edit the Name field to specify a custom name for the virtual machine.
- Optional: In the Description field, add a description.
Click Next to go to the Networking step. A
nic0
NIC is attached by default.- Optional: Click Add Network Interface to create additional NICs.
- Optional: You can remove any or all NICs by clicking the Options menu and selecting Delete. A virtual machine does not need a NIC attached to be created. You can create NICs after the virtual machine has been created.
Click Next to go to the Storage step.
- Optional: Click Add Disk to create additional disks. These disks can be removed by clicking the Options menu and selecting Delete.
- Optional: Click the Options menu to edit the disk and save your changes.
- Click Next to go to the Advanced step and review the details for Cloud-init.
- Click Next to go to the Review step and review the settings for the virtual machine.
- Click Create Virtual Machine.
Click See virtual machine details to view the Overview for this virtual machine.
The virtual machine is listed in the Virtual Machines tab.
Refer to the virtual machine wizard fields section when running the web console wizard.
7.1.2.1. Virtual machine wizard fields
Name | Parameter | Description |
---|---|---|
Name |
The name can contain lowercase letters ( | |
Description | Optional description field. | |
Operating System | The primary operating system that is selected for the virtual machine in the template. You cannot edit this field when creating a virtual machine from a template. | |
Boot Source | Import via URL (creates PVC) | Import content from an image available from an HTTP or HTTPS endpoint. Example: Obtaining a URL link from the web page with the operating system image. |
Clone existing PVC (creates PVC) | Select an existent persistent volume claim available on the cluster and clone it. | |
Import via Registry (creates PVC) |
Provision virtual machine from a bootable operating system container located in a registry accessible from the cluster. Example: | |
PXE (network boot - adds network interface) | Boot an operating system from a server on the network. Requires a PXE bootable network attachment definition. | |
Persistent Volume Claim project | Project name that you want to use for cloning the PVC. | |
Persistent Volume Claim name | PVC name that should apply to this virtual machine template if you are cloning an existing PVC. | |
Mount this as a CD-ROM boot source | A CD-ROM requires an additional disk for installing the operating system. Select the checkbox to add a disk and customize it later. | |
Flavor | Tiny, Small, Medium, Large, Custom | Presets that determine the amount of CPU and memory allocated to the virtual machine. The presets displayed for Flavor are determined by the operating system. |
Workload Type | Desktop | A virtual machine configuration for use on a desktop. Ideal for consumption on a small scale. Recommended for use with the web console. |
Server | Balances performance and it is compatible with a wide range of server workloads. | |
High-Performance | A virtual machine configuration that is optimized for high-performance workloads. | |
Start this virtual machine after creation. | This checkbox is selected by default and the virtual machine starts running after creation. Clear the checkbox if you do not want the virtual machine to start when it is created. |
7.1.2.2. Networking fields
Name | Description |
---|---|
Name | Name for the network interface controller. |
Model | Indicates the model of the network interface controller. Supported values are e1000e and virtio. |
Network | List of available network attachment definitions. |
Type |
List of available binding methods. For the default pod network, |
MAC Address | MAC address for the network interface controller. If a MAC address is not specified, one is assigned automatically. |
7.1.2.3. Storage fields
Name | Selection | Description |
---|---|---|
Source | Blank (creates PVC) | Create an empty disk. |
Import via URL (creates PVC) | Import content via URL (HTTP or HTTPS endpoint). | |
Use an existing PVC | Use a PVC that is already available in the cluster. | |
Clone existing PVC (creates PVC) | Select an existing PVC available in the cluster and clone it. | |
Import via Registry (creates PVC) | Import content via container registry. | |
Container (ephemeral) | Upload content from a container located in a registry accessible from the cluster. The container disk should be used only for read-only filesystems such as CD-ROMs or temporary virtual machines. | |
Name |
Name of the disk. The name can contain lowercase letters ( | |
Size | Size of the disk in GiB. | |
Type | Type of disk. Example: Disk or CD-ROM | |
Interface | Type of disk device. Supported interfaces are virtIO, SATA, and SCSI. | |
Storage Class | The storage class that is used to create the disk. | |
Advanced → Volume Mode | Defines whether the persistent volume uses a formatted file system or raw block state. Default is Filesystem. | |
Advanced → Access Mode | Access mode of the persistent volume. Supported access modes are Single User (RWO), Shared Access (RWX), and Read Only (ROX). |
Advanced storage settings
The following advanced storage settings are available for Blank, Import via URL, and Clone existing PVC disks. These parameters are optional. If you do not specify these parameters, the system uses the default values from the kubevirt-storage-class-defaults
config map.
Name | Parameter | Description |
---|---|---|
Volume Mode | Filesystem | Stores the virtual disk on a file system-based volume. |
Block |
Stores the virtual disk directly on the block volume. Only use | |
Access Mode | Single User (RWO) | The disk can be mounted as read/write by a single node. |
Shared Access (RWX) | The disk can be mounted as read/write by many nodes. Note This is required for some features, such as live migration of virtual machines between nodes. | |
Read Only (ROX) | The disk can be mounted as read-only by many nodes. |
7.1.2.4. Cloud-init fields
Name | Description |
---|---|
Hostname | Sets a specific hostname for the virtual machine. |
Authorized SSH Keys | The user’s public key that is copied to ~/.ssh/authorized_keys on the virtual machine. |
Custom script | Replaces other options with a field in which you paste a custom cloud-init script. |
For more information on the kubevirt-storage-class-defaults
config map, see Storage defaults for data volumes.
7.1.2.5. Pasting in a pre-configured YAML file to create a virtual machine
Create a virtual machine by writing or pasting a YAML configuration file. A valid example
virtual machine configuration is provided by default whenever you open the YAML edit screen.
If your YAML configuration is invalid when you click Create, an error message indicates the parameter in which the error occurs. Only one error is shown at a time.
Navigating away from the YAML screen while editing cancels any changes to the configuration you have made.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Click Create and select Virtual Machine With YAML.
Write or paste your virtual machine configuration in the editable window.
-
Alternatively, use the
example
virtual machine provided by default in the YAML screen.
-
Alternatively, use the
- Optional: Click Download to download the YAML configuration file in its present state.
- Click Create to create the virtual machine.
The virtual machine is listed in the Virtual Machines tab.
7.1.3. Using the CLI to create a virtual machine
You can create a virtual machine from a virtualMachine
manifest.
Procedure
Edit the
VirtualMachine
manifest for your VM. For example, the following manifest configures a Red Hat Enterprise Linux (RHEL) VM:Example 7.1. Example manifest for a RHEL VM
apiVersion: kubevirt.io/v1 kind: VirtualMachine metadata: labels: app: <vm_name> 1 name: <vm_name> spec: dataVolumeTemplates: - apiVersion: cdi.kubevirt.io/v1beta1 kind: DataVolume metadata: name: <vm_name> spec: sourceRef: kind: DataSource name: rhel9 namespace: openshift-virtualization-os-images storage: resources: requests: storage: 30Gi running: false template: metadata: labels: kubevirt.io/domain: <vm_name> spec: domain: cpu: cores: 1 sockets: 2 threads: 1 devices: disks: - disk: bus: virtio name: rootdisk - disk: bus: virtio name: cloudinitdisk interfaces: - masquerade: {} name: default rng: {} features: smm: enabled: true firmware: bootloader: efi: {} resources: requests: memory: 8Gi evictionStrategy: LiveMigrate networks: - name: default pod: {} volumes: - dataVolume: name: <vm_name> name: rootdisk - cloudInitNoCloud: userData: |- #cloud-config user: cloud-user password: '<password>' 2 chpasswd: { expire: False } name: cloudinitdisk
Create a virtual machine by using the manifest file:
$ oc create -f <vm_manifest_file>.yaml
Optional: Start the virtual machine:
$ virtctl start <vm_name>
7.1.4. Virtual machine storage volume types
Storage volume type | Description |
---|---|
ephemeral | A local copy-on-write (COW) image that uses a network volume as a read-only backing store. The backing volume must be a PersistentVolumeClaim. The ephemeral image is created when the virtual machine starts and stores all writes locally. The ephemeral image is discarded when the virtual machine is stopped, restarted, or deleted. The backing volume (PVC) is not mutated in any way. |
persistentVolumeClaim | Attaches an available PV to a virtual machine. Attaching a PV allows for the virtual machine data to persist between sessions. Importing an existing virtual machine disk into a PVC by using CDI and attaching the PVC to a virtual machine instance is the recommended method for importing existing virtual machines into OpenShift Container Platform. There are some requirements for the disk to be used within a PVC. |
dataVolume |
Data volumes build on the
Specify |
cloudInitNoCloud | Attaches a disk that contains the referenced cloud-init NoCloud data source, providing user data and metadata to the virtual machine. A cloud-init installation is required inside the virtual machine disk. |
containerDisk | References an image, such as a virtual machine disk, that is stored in the container image registry. The image is pulled from the registry and attached to the virtual machine as a disk when the virtual machine is launched.
A Only RAW and QCOW2 formats are supported disk types for the container image registry. QCOW2 is recommended for reduced image size. Note
A |
emptyDisk | Creates an additional sparse QCOW2 disk that is tied to the life-cycle of the virtual machine interface. The data survives guest-initiated reboots in the virtual machine but is discarded when the virtual machine stops or is restarted from the web console. The empty disk is used to store application dependencies and data that otherwise exceeds the limited temporary file system of an ephemeral disk. The disk capacity size must also be provided. |
7.1.5. About RunStrategies for virtual machines
A RunStrategy
for virtual machines determines a virtual machine instance’s (VMI) behavior, depending on a series of conditions. The spec.runStrategy
setting exists in the virtual machine configuration process as an alternative to the spec.running
setting. The spec.runStrategy
setting allows greater flexibility for how VMIs are created and managed, in contrast to the spec.running
setting with only true
or false
responses. However, the two settings are mutually exclusive. Only either spec.running
or spec.runStrategy
can be used. An error occurs if both are used.
There are four defined RunStrategies.
Always
-
A VMI is always present when a virtual machine is created. A new VMI is created if the original stops for any reason, which is the same behavior as
spec.running: true
. RerunOnFailure
- A VMI is re-created if the previous instance fails due to an error. The instance is not re-created if the virtual machine stops successfully, such as when it shuts down.
Manual
-
The
start
,stop
, andrestart
virtctl client commands can be used to control the VMI’s state and existence. Halted
-
No VMI is present when a virtual machine is created, which is the same behavior as
spec.running: false
.
Different combinations of the start
, stop
and restart
virtctl commands affect which RunStrategy
is used.
The following table follows a VM’s transition from different states. The first column shows the VM’s initial RunStrategy
. Each additional column shows a virtctl command and the new RunStrategy
after that command is run.
Initial RunStrategy | start | stop | restart |
---|---|---|---|
Always | - | Halted | Always |
RerunOnFailure | - | Halted | RerunOnFailure |
Manual | Manual | Manual | Manual |
Halted | Always | - | - |
In OpenShift Virtualization clusters installed using installer-provisioned infrastructure, when a node fails the MachineHealthCheck and becomes unavailable to the cluster, VMs with a RunStrategy of Always
or RerunOnFailure
are rescheduled on a new node.
apiVersion: kubevirt.io/v1alpha3
kind: VirtualMachine
spec:
RunStrategy: Always 1
template:
...
- 1
- The VMI’s current
RunStrategy
setting.
7.1.6. Additional resources
The
VirtualMachineSpec
definition in the KubeVirt v0.36.5 API Reference provides broader context for the parameters and hierarchy of the virtual machine specification.NoteThe KubeVirt API Reference is the upstream project reference and might contain parameters that are not supported in OpenShift Virtualization.
-
Prepare a container disk before adding it to a virtual machine as a
containerDisk
volume. - See Deploying machine health checks for further details on deploying and enabling machine health checks.
- See Installer-provisioned infrastructure overview for further details on installer-provisioned infrastructure.
- See Configuring the SR-IOV Network Operator for further details on the SR-IOV Network Operator.
7.2. Editing virtual machines
You can update a virtual machine configuration using either the YAML editor in the web console or the OpenShift client on the command line. You can also update a subset of the parameters in the Virtual Machine Details screen.
7.2.1. Editing a virtual machine in the web console
Edit select values of a virtual machine in the web console by clicking the pencil icon next to the relevant field. Other values can be edited using the CLI.
Labels and annotations are editable for both preconfigured Red Hat templates and your custom virtual machine templates. All other values are editable only for custom virtual machine templates that users have created using the Red Hat templates or the Create Virtual Machine Template wizard.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine.
- Click the Details tab.
- Click the pencil icon to make a field editable.
- Make the relevant changes and click Save.
If the virtual machine is running, changes to Boot Order or Flavor will not take effect until you restart the virtual machine.
You can view pending changes by clicking View Pending Changes on the right side of the relevant field. The Pending Changes banner at the top of the page displays a list of all changes that will be applied when the virtual machine restarts.
7.2.2. Editing a virtual machine YAML configuration using the web console
You can edit the YAML configuration of a virtual machine in the web console. Some parameters cannot be modified. If you click Save with an invalid configuration, an error message indicates the parameter that cannot be changed.
If you edit the YAML configuration while the virtual machine is running, changes will not take effect until you restart the virtual machine.
Navigating away from the YAML screen while editing cancels any changes to the configuration you have made.
Procedure
- Click Workloads → Virtualization from the side menu.
- Select a virtual machine.
- Click the YAML tab to display the editable configuration.
- Optional: You can click Download to download the YAML file locally in its current state.
- Edit the file and click Save.
A confirmation message shows that the modification has been successful and includes the updated version number for the object.
7.2.3. Editing a virtual machine YAML configuration using the CLI
Use this procedure to edit a virtual machine YAML configuration using the CLI.
Prerequisites
- You configured a virtual machine with a YAML object configuration file.
-
You installed the
oc
CLI.
Procedure
Run the following command to update the virtual machine configuration:
$ oc edit <object_type> <object_ID>
- Open the object configuration.
- Edit the YAML.
If you edit a running virtual machine, you need to do one of the following:
- Restart the virtual machine.
Run the following command for the new configuration to take effect:
$ oc apply <object_type> <object_ID>
7.2.4. Adding a virtual disk to a virtual machine
Use this procedure to add a virtual disk to a virtual machine.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
- Click the Disks tab.
In the Add Disk window, specify the Source, Name, Size, Type, Interface, and Storage Class.
-
Optional: In the Advanced list, specify the Volume Mode and Access Mode for the virtual disk. If you do not specify these parameters, the system uses the default values from the
kubevirt-storage-class-defaults
config map.
-
Optional: In the Advanced list, specify the Volume Mode and Access Mode for the virtual disk. If you do not specify these parameters, the system uses the default values from the
- Click Add.
If the virtual machine is running, the new disk is in the pending restart state and will not be attached until you restart the virtual machine.
The Pending Changes banner at the top of the page displays a list of all changes that will be applied when the virtual machine restarts.
For more information on the kubevirt-storage-class-defaults
config map, see Storage defaults for data volumes.
7.2.4.1. Storage fields
Name | Selection | Description |
---|---|---|
Source | Blank (creates PVC) | Create an empty disk. |
Import via URL (creates PVC) | Import content via URL (HTTP or HTTPS endpoint). | |
Use an existing PVC | Use a PVC that is already available in the cluster. | |
Clone existing PVC (creates PVC) | Select an existing PVC available in the cluster and clone it. | |
Import via Registry (creates PVC) | Import content via container registry. | |
Container (ephemeral) | Upload content from a container located in a registry accessible from the cluster. The container disk should be used only for read-only filesystems such as CD-ROMs or temporary virtual machines. | |
Name |
Name of the disk. The name can contain lowercase letters ( | |
Size | Size of the disk in GiB. | |
Type | Type of disk. Example: Disk or CD-ROM | |
Interface | Type of disk device. Supported interfaces are virtIO, SATA, and SCSI. | |
Storage Class | The storage class that is used to create the disk. | |
Advanced → Volume Mode | Defines whether the persistent volume uses a formatted file system or raw block state. Default is Filesystem. | |
Advanced → Access Mode | Access mode of the persistent volume. Supported access modes are Single User (RWO), Shared Access (RWX), and Read Only (ROX). |
Advanced storage settings
The following advanced storage settings are available for Blank, Import via URL, and Clone existing PVC disks. These parameters are optional. If you do not specify these parameters, the system uses the default values from the kubevirt-storage-class-defaults
config map.
Name | Parameter | Description |
---|---|---|
Volume Mode | Filesystem | Stores the virtual disk on a file system-based volume. |
Block |
Stores the virtual disk directly on the block volume. Only use | |
Access Mode | Single User (RWO) | The disk can be mounted as read/write by a single node. |
Shared Access (RWX) | The disk can be mounted as read/write by many nodes. Note This is required for some features, such as live migration of virtual machines between nodes. | |
Read Only (ROX) | The disk can be mounted as read-only by many nodes. |
7.2.5. Adding a network interface to a virtual machine
Use this procedure to add a network interface to a virtual machine.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
- Click the Network Interfaces tab.
- Click Add Network Interface.
- In the Add Network Interface window, specify the Name, Model, Network, Type, and MAC Address of the network interface.
- Click Add.
If the virtual machine is running, the new network interface is in the pending restart state and changes will not take effect until you restart the virtual machine.
The Pending Changes banner at the top of the page displays a list of all changes that will be applied when the virtual machine restarts.
7.2.5.1. Networking fields
Name | Description |
---|---|
Name | Name for the network interface controller. |
Model | Indicates the model of the network interface controller. Supported values are e1000e and virtio. |
Network | List of available network attachment definitions. |
Type |
List of available binding methods. For the default pod network, |
MAC Address | MAC address for the network interface controller. If a MAC address is not specified, one is assigned automatically. |
7.2.6. Editing CD-ROMs for Virtual Machines
Use the following procedure to edit CD-ROMs for virtual machines.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
- Click the Disks tab.
- Click the Options menu for the CD-ROM that you want to edit and select Edit.
- In the Edit CD-ROM window, edit the fields: Source, Persistent Volume Claim, Name, Type, and Interface.
- Click Save.
7.3. Editing boot order
You can update the values for a boot order list by using the web console or the CLI.
With Boot Order in the Virtual Machine Overview page, you can:
- Select a disk or network interface controller (NIC) and add it to the boot order list.
- Edit the order of the disks or NICs in the boot order list.
- Remove a disk or NIC from the boot order list, and return it back to the inventory of bootable sources.
7.3.1. Adding items to a boot order list in the web console
Add items to a boot order list by using the web console.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
- Click the Details tab.
- Click the pencil icon that is located on the right side of Boot Order. If a YAML configuration does not exist, or if this is the first time that you are creating a boot order list, the following message displays: No resource selected. VM will attempt to boot from disks by order of appearance in YAML file.
- Click Add Source and select a bootable disk or network interface controller (NIC) for the virtual machine.
- Add any additional disks or NICs to the boot order list.
- Click Save.
If the virtual machine is running, changes to Boot Order will not take effect until you restart the virtual machine.
You can view pending changes by clicking View Pending Changes on the right side of the Boot Order field. The Pending Changes banner at the top of the page displays a list of all changes that will be applied when the virtual machine restarts.
7.3.2. Editing a boot order list in the web console
Edit the boot order list in the web console.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
- Click the Details tab.
- Click the pencil icon that is located on the right side of Boot Order.
Choose the appropriate method to move the item in the boot order list:
- If you do not use a screen reader, hover over the arrow icon next to the item that you want to move, drag the item up or down, and drop it in a location of your choice.
- If you use a screen reader, press the Up Arrow key or Down Arrow key to move the item in the boot order list. Then, press the Tab key to drop the item in a location of your choice.
- Click Save.
If the virtual machine is running, changes to the boot order list will not take effect until you restart the virtual machine.
You can view pending changes by clicking View Pending Changes on the right side of the Boot Order field. The Pending Changes banner at the top of the page displays a list of all changes that will be applied when the virtual machine restarts.
7.3.3. Editing a boot order list in the YAML configuration file
Edit the boot order list in a YAML configuration file by using the CLI.
Procedure
Open the YAML configuration file for the virtual machine by running the following command:
$ oc edit vm example
Edit the YAML file and modify the values for the boot order associated with a disk or network interface controller (NIC). For example:
disks: - bootOrder: 1 1 disk: bus: virtio name: containerdisk - disk: bus: virtio name: cloudinitdisk - cdrom: bus: virtio name: cd-drive-1 interfaces: - boot Order: 2 2 macAddress: '02:96:c4:00:00' masquerade: {} name: default
- Save the YAML file.
- Click reload the content to apply the updated boot order values from the YAML file to the boot order list in the web console.
7.3.4. Removing items from a boot order list in the web console
Remove items from a boot order list by using the web console.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
- Click the Details tab.
- Click the pencil icon that is located on the right side of Boot Order.
- Click the Remove icon next to the item. The item is removed from the boot order list and saved in the list of available boot sources. If you remove all items from the boot order list, the following message displays: No resource selected. VM will attempt to boot from disks by order of appearance in YAML file.
If the virtual machine is running, changes to Boot Order will not take effect until you restart the virtual machine.
You can view pending changes by clicking View Pending Changes on the right side of the Boot Order field. The Pending Changes banner at the top of the page displays a list of all changes that will be applied when the virtual machine restarts.
7.4. Deleting virtual machines
You can delete a virtual machine from the web console or by using the oc
command line interface.
7.4.1. Deleting a virtual machine using the web console
Deleting a virtual machine permanently removes it from the cluster.
When you delete a virtual machine, the data volume it uses is automatically deleted.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
Click the Options menu of the virtual machine that you want to delete and select Delete Virtual Machine.
- Alternatively, click the virtual machine name to open the Virtual Machine Overview screen and click Actions → Delete Virtual Machine.
- In the confirmation pop-up window, click Delete to permanently delete the virtual machine.
7.4.2. Deleting a virtual machine by using the CLI
You can delete a virtual machine by using the oc
command line interface (CLI). The oc
client enables you to perform actions on multiple virtual machines.
When you delete a virtual machine, the data volume it uses is automatically deleted.
Prerequisites
- Identify the name of the virtual machine that you want to delete.
Procedure
Delete the virtual machine by running the following command:
$ oc delete vm <vm_name>
NoteThis command only deletes objects that exist in the current project. Specify the
-n <project_name>
option if the object you want to delete is in a different project or namespace.
7.5. Managing virtual machine instances
If you have standalone virtual machine instances (VMIs) that were created independently outside of the OpenShift Virtualization environment, you can manage them by using the web console or the command-line interface (CLI).
7.5.1. About virtual machine instances
A virtual machine instance (VMI) is a representation of a running virtual machine (VM). When a VMI is owned by a VM or by another object, you manage it through its owner in the web console or by using the oc
command-line interface (CLI).
A standalone VMI is created and started independently with a script, through automation, or by using other methods in the CLI. In your environment, you might have standalone VMIs that were developed and started outside of the OpenShift Virtualization environment. You can continue to manage those standalone VMIs by using the CLI. You can also use the web console for specific tasks associated with standalone VMIs:
- List standalone VMIs and their details.
- Edit labels and annotations for a standalone VMI.
- Delete a standalone VMI.
When you delete a VM, the associated VMI is automatically deleted. You delete a standalone VMI directly because it is not owned by VMs or other objects.
Before you uninstall OpenShift Virtualization, list and view the standalone VMIs by using the CLI or the web console. Then, delete any outstanding VMIs.
7.5.2. Listing all virtual machine instances using the CLI
You can list all virtual machine instances (VMIs) in your cluster, including standalone VMIs and those owned by virtual machines, by using the oc
command-line interface (CLI).
Procedure
List all VMIs by running the following command:
$ oc get vmis
7.5.3. Listing standalone virtual machine instances using the web console
Using the web console, you can list and view standalone virtual machine instances (VMIs) in your cluster that are not owned by virtual machines (VMs).
VMIs that are owned by VMs or other objects are not displayed in the web console. The web console displays only standalone VMIs. If you want to list all VMIs in your cluster, you must use the CLI.
Procedure
- Click Workloads → Virtualization from the side menu. A list of VMs and standalone VMIs displays. You can identify standalone VMIs by the dark colored badges that display next to the virtual machine instance names.
7.5.4. Editing a standalone virtual machine instance using the web console
You can edit annotations and labels for a standalone virtual machine instance (VMI) using the web console. Other items displayed in the Details page for a standalone VMI are not editable.
Procedure
- Click Workloads → Virtualization from the side menu. A list of virtual machines (VMs) and standalone VMIs displays.
- Click the name of a standalone VMI to open the Virtual Machine Instance Overview screen.
- Click the Details tab.
- Click the pencil icon that is located on the right side of Annotations.
- Make the relevant changes and click Save.
To edit labels for a standalone VMI, click Actions and select Edit Labels. Make the relevant changes and click Save.
7.5.5. Deleting a standalone virtual machine instance using the CLI
You can delete a standalone virtual machine instance (VMI) by using the oc
command-line interface (CLI).
Prerequisites
- Identify the name of the VMI that you want to delete.
Procedure
Delete the VMI by running the following command:
$ oc delete vmi <vmi_name>
7.5.6. Deleting a standalone virtual machine instance using the web console
Delete a standalone virtual machine instance (VMI) from the web console.
Procedure
- In the OpenShift Container Platform web console, click Workloads → Virtualization from the side menu.
Click the ⋮ button of the standalone virtual machine instance (VMI) that you want to delete and select Delete Virtual Machine Instance.
- Alternatively, click the name of the standalone VMI. The Virtual Machine Instance Overview page displays.
- Select Actions → Delete Virtual Machine Instance.
- In the confirmation pop-up window, click Delete to permanently delete the standalone VMI.
7.6. Controlling virtual machine states
You can stop, start, restart, and unpause virtual machines from the web console.
To control virtual machines from the command-line interface (CLI), use the virtctl
client.
7.6.1. Starting a virtual machine
You can start a virtual machine from the web console.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Find the row that contains the virtual machine that you want to start.
Navigate to the appropriate menu for your use case:
To stay on this page, where you can perform actions on multiple virtual machines:
- Click the Options menu located at the far right end of the row.
To view comprehensive information about the selected virtual machine before you start it:
- Access the Virtual Machine Overview screen by clicking the name of the virtual machine.
- Click Actions.
- Select Start Virtual Machine.
- In the confirmation window, click Start to start the virtual machine.
When you start virtual machine that is provisioned from a URL
source for the first time, the virtual machine has a status of Importing while OpenShift Virtualization imports the container from the URL endpoint. Depending on the size of the image, this process might take several minutes.
7.6.2. Restarting a virtual machine
You can restart a running virtual machine from the web console.
To avoid errors, do not restart a virtual machine while it has a status of Importing.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Find the row that contains the virtual machine that you want to restart.
Navigate to the appropriate menu for your use case:
To stay on this page, where you can perform actions on multiple virtual machines:
- Click the Options menu located at the far right end of the row.
To view comprehensive information about the selected virtual machine before you restart it:
- Access the Virtual Machine Overview screen by clicking the name of the virtual machine.
- Click Actions.
- Select Restart Virtual Machine.
- In the confirmation window, click Restart to restart the virtual machine.
7.6.3. Stopping a virtual machine
You can stop a virtual machine from the web console.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Find the row that contains the virtual machine that you want to stop.
Navigate to the appropriate menu for your use case:
To stay on this page, where you can perform actions on multiple virtual machines:
- Click the Options menu located at the far right end of the row.
To view comprehensive information about the selected virtual machine before you stop it:
- Access the Virtual Machine Overview screen by clicking the name of the virtual machine.
- Click Actions.
- Select Stop Virtual Machine.
- In the confirmation window, click Stop to stop the virtual machine.
7.6.4. Unpausing a virtual machine
You can unpause a paused virtual machine from the web console.
Prerequisites
At least one of your virtual machines must have a status of Paused.
NoteYou can pause virtual machines by using the
virtctl
client.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Find the row that contains the virtual machine that you want to unpause.
Navigate to the appropriate menu for your use case:
To stay on this page, where you can perform actions on multiple virtual machines:
- In the Status column, click Paused.
To view comprehensive information about the selected virtual machine before you unpause it:
- Access the Virtual Machine Overview screen by clicking the name of the virtual machine.
- Click the pencil icon that is located on the right side of Status.
- In the confirmation window, click Unpause to unpause the virtual machine.
7.7. Accessing virtual machine consoles
OpenShift Virtualization provides different virtual machine consoles that you can use to accomplish different product tasks. You can access these consoles through the OpenShift Container Platform web console and by using CLI commands.
7.7.1. Accessing virtual machine consoles in the OpenShift Container Platform web console
You can connect to virtual machines by using the serial console or the VNC console in the OpenShift Container Platform web console.
You can connect to Windows virtual machines by using the desktop viewer console, which uses RDP (remote desktop protocol), in the OpenShift Container Platform web console.
7.7.1.1. Connecting to the serial console
Connect to the serial console of a running virtual machine from the Console tab in the Virtual Machine Overview screen of the web console.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview page.
- Click Console. The VNC console opens by default.
- Select Disconnect before switching to ensure that only one console session is open at a time. Otherwise, the VNC console session remains active in the background.
- Click the VNC Console drop-down list and select Serial Console.
- Click Disconnect to end the console session.
- Optional: Open the serial console in a separate window by clicking Open Console in New Window.
7.7.1.2. Connecting to the VNC console
Connect to the VNC console of a running virtual machine from the Console tab in the Virtual Machine Overview screen of the web console.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview page.
- Click the Console tab. The VNC console opens by default.
- Optional: Open the VNC console in a separate window by clicking Open Console in New Window.
- Optional: Send key combinations to the virtual machine by clicking Send Key.
7.7.1.3. Connecting to a Windows virtual machine with RDP
The desktop viewer console, which utilizes the Remote Desktop Protocol (RDP), provides a better console experience for connecting to Windows virtual machines.
To connect to a Windows virtual machine with RDP, download the console.rdp
file for the virtual machine from the Consoles tab in the Virtual Machine Details screen of the web console and supply it to your preferred RDP client.
Prerequisites
-
A running Windows virtual machine with the QEMU guest agent installed. The
qemu-guest-agent
is included in the VirtIO drivers. - A layer-2 NIC attached to the virtual machine.
- An RDP client installed on a machine on the same network as the Windows virtual machine.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a Windows virtual machine to open the Virtual Machine Overview screen.
- Click the Console tab.
- In the Console list, select Desktop Viewer.
- In the Network Interface list, select the layer-2 NIC.
-
Click Launch Remote Desktop to download the
console.rdp
file. Open an RDP client and reference the
console.rdp
file. For example, using remmina:$ remmina --connect /path/to/console.rdp
- Enter the Administrator user name and password to connect to the Windows virtual machine.
7.7.1.4. Copying the SSH command from the web console
Copy the command to access a running virtual machine (VM) via SSH from the Actions list in the web console.
Procedure
- In the OpenShift Container Platform console, click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview page.
-
From the Actions list, select Copy SSH Command. You can now paste this command onto the OpenShift CLI (
oc
).
7.7.2. Accessing virtual machine consoles by using CLI commands
7.7.2.1. Accessing a virtual machine instance via SSH
You can use SSH to access a virtual machine (VM) after you expose port 22 on it.
The virtctl expose
command forwards a virtual machine instance (VMI) port to a node port and creates a service for enabled access. The following example creates the fedora-vm-ssh
service that forwards traffic from a specific port of cluster nodes to port 22 of the <fedora-vm>
virtual machine.
Prerequisites
- You must be in the same project as the VMI.
-
The VMI you want to access must be connected to the default pod network by using the
masquerade
binding method. - The VMI you want to access must be running.
-
Install the OpenShift CLI (
oc
).
Procedure
Run the following command to create the
fedora-vm-ssh
service:$ virtctl expose vm <fedora-vm> --port=22 --name=fedora-vm-ssh --type=NodePort 1
- 1
<fedora-vm>
is the name of the VM that you run thefedora-vm-ssh
service on.
Check the service to find out which port the service acquired:
$ oc get svc
Example output
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE fedora-vm-ssh NodePort 127.0.0.1 <none> 22:32551/TCP 6s
+ In this example, the service acquired the 32551
port.
Log in to the VMI via SSH. Use the
ipAddress
of any of the cluster nodes and the port that you found in the previous step:$ ssh username@<node_IP_address> -p 32551
7.7.2.2. Accessing the serial console of a virtual machine instance
The virtctl console
command opens a serial console to the specified virtual machine instance.
Prerequisites
-
The
virt-viewer
package must be installed. - The virtual machine instance you want to access must be running.
Procedure
Connect to the serial console with
virtctl
:$ virtctl console <VMI>
7.7.2.3. Accessing the graphical console of a virtual machine instances with VNC
The virtctl
client utility can use the remote-viewer
function to open a graphical console to a running virtual machine instance. This capability is included in the virt-viewer
package.
Prerequisites
-
The
virt-viewer
package must be installed. - The virtual machine instance you want to access must be running.
If you use virtctl
via SSH on a remote machine, you must forward the X session to your machine.
Procedure
Connect to the graphical interface with the
virtctl
utility:$ virtctl vnc <VMI>
If the command failed, try using the
-v
flag to collect troubleshooting information:$ virtctl vnc <VMI> -v 4
7.7.2.4. Connecting to a Windows virtual machine with an RDP console
The Remote Desktop Protocol (RDP) provides a better console experience for connecting to Windows virtual machines.
To connect to a Windows virtual machine with RDP, specify the IP address of the attached L2 NIC to your RDP client.
Prerequisites
-
A running Windows virtual machine with the QEMU guest agent installed. The
qemu-guest-agent
is included in the VirtIO drivers. - A layer 2 NIC attached to the virtual machine.
- An RDP client installed on a machine on the same network as the Windows virtual machine.
Procedure
Log in to the OpenShift Virtualization cluster through the
oc
CLI tool as a user with an access token.$ oc login -u <user> https://<cluster.example.com>:8443
Use
oc describe vmi
to display the configuration of the running Windows virtual machine.$ oc describe vmi <windows-vmi-name>
Example output
... spec: networks: - name: default pod: {} - multus: networkName: cnv-bridge name: bridge-net ... status: interfaces: - interfaceName: eth0 ipAddress: 198.51.100.0/24 ipAddresses: 198.51.100.0/24 mac: a0:36:9f:0f:b1:70 name: default - interfaceName: eth1 ipAddress: 192.0.2.0/24 ipAddresses: 192.0.2.0/24 2001:db8::/32 mac: 00:17:a4:77:77:25 name: bridge-net ...
-
Identify and copy the IP address of the layer 2 network interface. This is
192.0.2.0
in the above example, or2001:db8::
if you prefer IPv6. - Open an RDP client and use the IP address copied in the previous step for the connection.
- Enter the Administrator user name and password to connect to the Windows virtual machine.
7.8. Triggering virtual machine failover by resolving a failed node
If a node fails and machine health checks are not deployed on your cluster, virtual machines (VMs) with RunStrategy: Always
configured are not automatically relocated to healthy nodes. To trigger VM failover, you must manually delete the Node
object.
If you installed your cluster by using installer-provisioned infrastructure and you properly configured machine health checks:
- Failed nodes are automatically recycled.
-
Virtual machines with
RunStrategy
set toAlways
orRerunOnFailure
are automatically scheduled on healthy nodes.
7.8.1. Prerequisites
-
A node where a virtual machine was running has the
NotReady
condition. -
The virtual machine that was running on the failed node has
RunStrategy
set toAlways
. -
You have installed the OpenShift CLI (
oc
).
7.8.2. Deleting nodes from a bare metal cluster
When you delete a node using the CLI, the node object is deleted in Kubernetes, but the pods that exist on the node are not deleted. Any bare pods not backed by a replication controller become inaccessible to OpenShift Container Platform. Pods backed by replication controllers are rescheduled to other available nodes. You must delete local manifest pods.
Procedure
Delete a node from an OpenShift Container Platform cluster running on bare metal by completing the following steps:
Mark the node as unschedulable:
$ oc adm cordon <node_name>
Drain all pods on the node:
$ oc adm drain <node_name> --force=true
This step might fail if the node is offline or unresponsive. Even if the node does not respond, it might still be running a workload that writes to shared storage. To avoid data corruption, power down the physical hardware before you proceed.
Delete the node from the cluster:
$ oc delete node <node_name>
Although the node object is now deleted from the cluster, it can still rejoin the cluster after reboot or if the kubelet service is restarted. To permanently delete the node and all its data, you must decommission the node.
- If you powered down the physical hardware, turn it back on so that the node can rejoin the cluster.
7.8.3. Verifying virtual machine failover
After all resources are terminated on the unhealthy node, a new virtual machine instance (VMI) is automatically created on a healthy node for each relocated VM. To confirm that the VMI was created, view all VMIs by using the oc
CLI.
7.8.3.1. Listing all virtual machine instances using the CLI
You can list all virtual machine instances (VMIs) in your cluster, including standalone VMIs and those owned by virtual machines, by using the oc
command-line interface (CLI).
Procedure
List all VMIs by running the following command:
$ oc get vmis
7.9. Installing the QEMU guest agent on virtual machines
The QEMU guest agent is a daemon that runs on the virtual machine and passes information to the host about the virtual machine, users, file systems, and secondary networks.
7.9.1. Installing QEMU guest agent on a Linux virtual machine
The qemu-guest-agent
is widely available and available by default in Red Hat virtual machines. Install the agent and start the service
Procedure
- Access the virtual machine command line through one of the consoles or by SSH.
Install the QEMU guest agent on the virtual machine:
$ yum install -y qemu-guest-agent
Ensure the service is persistent and start it:
$ systemctl enable --now qemu-guest-agent
You can also install and start the QEMU guest agent by using the custom script field in the cloud-init section of the wizard when creating either virtual machines or virtual machines templates in the web console.
7.9.2. Installing QEMU guest agent on a Windows virtual machine
For Windows virtual machines, the QEMU guest agent is included in the VirtIO drivers, which can be installed using one of the following procedures:
7.9.2.1. Installing VirtIO drivers on an existing Windows virtual machine
Install the VirtIO drivers from the attached SATA CD drive to an existing Windows virtual machine.
This procedure uses a generic approach to adding drivers to Windows. The process might differ slightly between versions of Windows. Refer to the installation documentation for your version of Windows for specific installation steps.
Procedure
- Start the virtual machine and connect to a graphical console.
- Log in to a Windows user session.
Open Device Manager and expand Other devices to list any Unknown device.
-
Open the
Device Properties
to identify the unknown device. Right-click the device and select Properties. - Click the Details tab and select Hardware Ids in the Property list.
- Compare the Value for the Hardware Ids with the supported VirtIO drivers.
-
Open the
- Right-click the device and select Update Driver Software.
- Click Browse my computer for driver software and browse to the attached SATA CD drive, where the VirtIO drivers are located. The drivers are arranged hierarchically according to their driver type, operating system, and CPU architecture.
- Click Next to install the driver.
- Repeat this process for all the necessary VirtIO drivers.
- After the driver installs, click Close to close the window.
- Reboot the virtual machine to complete the driver installation.
7.9.2.2. Installing VirtIO drivers during Windows installation
Install the VirtIO drivers from the attached SATA CD driver during Windows installation.
This procedure uses a generic approach to the Windows installation and the installation method might differ between versions of Windows. Refer to the documentation for the version of Windows that you are installing.
Procedure
- Start the virtual machine and connect to a graphical console.
- Begin the Windows installation process.
- Select the Advanced installation.
-
The storage destination will not be recognized until the driver is loaded. Click
Load driver
. - The drivers are attached as a SATA CD drive. Click OK and browse the CD drive for the storage driver to load. The drivers are arranged hierarchically according to their driver type, operating system, and CPU architecture.
- Repeat the previous two steps for all required drivers.
- Complete the Windows installation.
7.10. Viewing the QEMU guest agent information for virtual machines
When the QEMU guest agent runs on the virtual machine, you can use the web console to view information about the virtual machine, users, file systems, and secondary networks.
7.10.1. Prerequisites
- Install the QEMU guest agent on the virtual machine.
7.10.2. About the QEMU guest agent information in the web console
When the QEMU guest agent is installed, the Details pane within the Virtual Machine Overview tab and the Details tab display information about the hostname, operating system, time zone, and logged in users.
The Virtual Machine Overview shows information about the guest operating system installed on the virtual machine. The Details tab displays a table with information for logged in users. The Disks tab displays a table with information for file systems.
If the QEMU guest agent is not installed, the Virtual Machine Overview tab and the Details tab display information about the operating system that was specified when the virtual machine was created.
7.10.3. Viewing the QEMU guest agent information in the web console
You can use the web console to view information for virtual machines that is passed by the QEMU guest agent to the host.
Procedure
- Click Workloads → Virtual Machines from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine name to open the Virtual Machine Overview screen and view the Details pane.
- Click Logged in users to view the Details tab that shows information for users.
- Click the Disks tab to view information about the file systems.
7.11. Managing config maps, secrets, and service accounts in virtual machines
You can use secrets, config maps, and service accounts to pass configuration data to virtual machines. For example, you can:
- Give a virtual machine access to a service that requires credentials by adding a secret to the virtual machine.
- Store non-confidential configuration data in a config map so that a pod or another object can consume the data.
- Allow a component to access the API server by associating a service account with that component.
OpenShift Virtualization exposes secrets, config maps, and service accounts as virtual machine disks so that you can use them across platforms without additional overhead.
7.11.1. Adding a secret, config map, or service account to a virtual machine
Add a secret, config map, or service account to a virtual machine by using the OpenShift Container Platform web console.
Prerequisites
- The secret, config map, or service account that you want to add must exist in the same namespace as the target virtual machine.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
- Click the Environment tab.
- Click Select a resource and select a secret, config map, or service account from the list. A six character serial number is automatically generated for the selected resource.
- Click Save.
- Optional. Add another object by clicking Add Config Map, Secret or Service Account.
- You can reset the form to the last saved state by clicking Reload.
- The Environment resources are added to the virtual machine as disks. You can mount the secret, config map, or service account as you would mount any other disk.
- If the virtual machine is running, changes will not take effect until you restart the virtual machine. The newly added resources are marked as pending changes for both the Environment and Disks tab in the Pending Changes banner at the top of the page.
Verification
- From the Virtual Machine Overview page, click the Disks tab.
- Check to ensure that the secret, config map, or service account is included in the list of disks.
Optional. Choose the appropriate method to apply your changes:
- If the virtual machine is running, restart the virtual machine by clicking Actions → Restart Virtual Machine.
- If the virtual machine is stopped, start the virtual machine by clicking Actions → Start Virtual Machine.
You can now mount the secret, config map, or service account as you would mount any other disk.
7.11.2. Removing a secret, config map, or service account from a virtual machine
Remove a secret, config map, or service account from a virtual machine by using the OpenShift Container Platform web console.
Prerequisites
- You must have at least one secret, config map, or service account that is attached to a virtual machine.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
- Click the Environment tab.
- Find the item that you want to delete in the list, and click Remove on the right side of the item.
- Click Save.
You can reset the form to the last saved state by clicking Reload.
Verification
- From the Virtual Machine Overview page, click the Disks tab.
- Check to ensure that the secret, config map, or service account that you removed is no longer included in the list of disks.
7.11.3. Additional resources
7.12. Installing VirtIO driver on an existing Windows virtual machine
7.12.1. Understanding VirtIO drivers
VirtIO drivers are paravirtualized device drivers required for Microsoft Windows virtual machines to run in OpenShift Virtualization. The supported drivers are available in the container-native-virtualization/virtio-win
container disk of the Red Hat Ecosystem Catalog.
The container-native-virtualization/virtio-win
container disk must be attached to the virtual machine as a SATA CD drive to enable driver installation. You can install VirtIO drivers during Windows installation on the virtual machine or added to an existing Windows installation.
After the drivers are installed, the container-native-virtualization/virtio-win
container disk can be removed from the virtual machine.
See also: Installing Virtio drivers on a new Windows virtual machine.
7.12.2. Supported VirtIO drivers for Microsoft Windows virtual machines
Driver name | Hardware ID | Description |
---|---|---|
viostor |
VEN_1AF4&DEV_1001 | The block driver. Sometimes displays as an SCSI Controller in the Other devices group. |
viorng |
VEN_1AF4&DEV_1005 | The entropy source driver. Sometimes displays as a PCI Device in the Other devices group. |
NetKVM |
VEN_1AF4&DEV_1000 | The network driver. Sometimes displays as an Ethernet Controller in the Other devices group. Available only if a VirtIO NIC is configured. |
7.12.3. Adding VirtIO drivers container disk to a virtual machine
OpenShift Virtualization distributes VirtIO drivers for Microsoft Windows as a container disk, which is available from the Red Hat Ecosystem Catalog. To install these drivers to a Windows virtual machine, attach the container-native-virtualization/virtio-win
container disk to the virtual machine as a SATA CD drive in the virtual machine configuration file.
Prerequisites
-
Download the
container-native-virtualization/virtio-win
container disk from the Red Hat Ecosystem Catalog. This is not mandatory, because the container disk will be downloaded from the Red Hat registry if it not already present in the cluster, but it can reduce installation time.
Procedure
Add the
container-native-virtualization/virtio-win
container disk as acdrom
disk in the Windows virtual machine configuration file. The container disk will be downloaded from the registry if it is not already present in the cluster.spec: domain: devices: disks: - name: virtiocontainerdisk bootOrder: 2 1 cdrom: bus: sata volumes: - containerDisk: image: container-native-virtualization/virtio-win name: virtiocontainerdisk
- 1
- OpenShift Virtualization boots virtual machine disks in the order defined in the
VirtualMachine
configuration file. You can either define other disks for the virtual machine before thecontainer-native-virtualization/virtio-win
container disk or use the optionalbootOrder
parameter to ensure the virtual machine boots from the correct disk. If you specify thebootOrder
for a disk, it must be specified for all disks in the configuration.
The disk is available once the virtual machine has started:
-
If you add the container disk to a running virtual machine, use
oc apply -f <vm.yaml>
in the CLI or reboot the virtual machine for the changes to take effect. -
If the virtual machine is not running, use
virtctl start <vm>
.
-
If you add the container disk to a running virtual machine, use
After the virtual machine has started, the VirtIO drivers can be installed from the attached SATA CD drive.
7.12.4. Installing VirtIO drivers on an existing Windows virtual machine
Install the VirtIO drivers from the attached SATA CD drive to an existing Windows virtual machine.
This procedure uses a generic approach to adding drivers to Windows. The process might differ slightly between versions of Windows. Refer to the installation documentation for your version of Windows for specific installation steps.
Procedure
- Start the virtual machine and connect to a graphical console.
- Log in to a Windows user session.
Open Device Manager and expand Other devices to list any Unknown device.
-
Open the
Device Properties
to identify the unknown device. Right-click the device and select Properties. - Click the Details tab and select Hardware Ids in the Property list.
- Compare the Value for the Hardware Ids with the supported VirtIO drivers.
-
Open the
- Right-click the device and select Update Driver Software.
- Click Browse my computer for driver software and browse to the attached SATA CD drive, where the VirtIO drivers are located. The drivers are arranged hierarchically according to their driver type, operating system, and CPU architecture.
- Click Next to install the driver.
- Repeat this process for all the necessary VirtIO drivers.
- After the driver installs, click Close to close the window.
- Reboot the virtual machine to complete the driver installation.
7.12.5. Removing the VirtIO container disk from a virtual machine
After installing all required VirtIO drivers to the virtual machine, the container-native-virtualization/virtio-win
container disk no longer needs to be attached to the virtual machine. Remove the container-native-virtualization/virtio-win
container disk from the virtual machine configuration file.
Procedure
Edit the configuration file and remove the
disk
and thevolume
.$ oc edit vm <vm-name>
spec: domain: devices: disks: - name: virtiocontainerdisk bootOrder: 2 cdrom: bus: sata volumes: - containerDisk: image: container-native-virtualization/virtio-win name: virtiocontainerdisk
- Reboot the virtual machine for the changes to take effect.
7.13. Installing VirtIO driver on a new Windows virtual machine
7.13.1. Prerequisites
- Windows installation media accessible by the virtual machine, such as importing an ISO into a data volume and attaching it to the virtual machine.
7.13.2. Understanding VirtIO drivers
VirtIO drivers are paravirtualized device drivers required for Microsoft Windows virtual machines to run in OpenShift Virtualization. The supported drivers are available in the container-native-virtualization/virtio-win
container disk of the Red Hat Ecosystem Catalog.
The container-native-virtualization/virtio-win
container disk must be attached to the virtual machine as a SATA CD drive to enable driver installation. You can install VirtIO drivers during Windows installation on the virtual machine or added to an existing Windows installation.
After the drivers are installed, the container-native-virtualization/virtio-win
container disk can be removed from the virtual machine.
See also: Installing VirtIO driver on an existing Windows virtual machine.
7.13.3. Supported VirtIO drivers for Microsoft Windows virtual machines
Driver name | Hardware ID | Description |
---|---|---|
viostor |
VEN_1AF4&DEV_1001 | The block driver. Sometimes displays as an SCSI Controller in the Other devices group. |
viorng |
VEN_1AF4&DEV_1005 | The entropy source driver. Sometimes displays as a PCI Device in the Other devices group. |
NetKVM |
VEN_1AF4&DEV_1000 | The network driver. Sometimes displays as an Ethernet Controller in the Other devices group. Available only if a VirtIO NIC is configured. |
7.13.4. Adding VirtIO drivers container disk to a virtual machine
OpenShift Virtualization distributes VirtIO drivers for Microsoft Windows as a container disk, which is available from the Red Hat Ecosystem Catalog. To install these drivers to a Windows virtual machine, attach the container-native-virtualization/virtio-win
container disk to the virtual machine as a SATA CD drive in the virtual machine configuration file.
Prerequisites
-
Download the
container-native-virtualization/virtio-win
container disk from the Red Hat Ecosystem Catalog. This is not mandatory, because the container disk will be downloaded from the Red Hat registry if it not already present in the cluster, but it can reduce installation time.
Procedure
Add the
container-native-virtualization/virtio-win
container disk as acdrom
disk in the Windows virtual machine configuration file. The container disk will be downloaded from the registry if it is not already present in the cluster.spec: domain: devices: disks: - name: virtiocontainerdisk bootOrder: 2 1 cdrom: bus: sata volumes: - containerDisk: image: container-native-virtualization/virtio-win name: virtiocontainerdisk
- 1
- OpenShift Virtualization boots virtual machine disks in the order defined in the
VirtualMachine
configuration file. You can either define other disks for the virtual machine before thecontainer-native-virtualization/virtio-win
container disk or use the optionalbootOrder
parameter to ensure the virtual machine boots from the correct disk. If you specify thebootOrder
for a disk, it must be specified for all disks in the configuration.
The disk is available once the virtual machine has started:
-
If you add the container disk to a running virtual machine, use
oc apply -f <vm.yaml>
in the CLI or reboot the virtual machine for the changes to take effect. -
If the virtual machine is not running, use
virtctl start <vm>
.
-
If you add the container disk to a running virtual machine, use
After the virtual machine has started, the VirtIO drivers can be installed from the attached SATA CD drive.
7.13.5. Installing VirtIO drivers during Windows installation
Install the VirtIO drivers from the attached SATA CD driver during Windows installation.
This procedure uses a generic approach to the Windows installation and the installation method might differ between versions of Windows. Refer to the documentation for the version of Windows that you are installing.
Procedure
- Start the virtual machine and connect to a graphical console.
- Begin the Windows installation process.
- Select the Advanced installation.
-
The storage destination will not be recognized until the driver is loaded. Click
Load driver
. - The drivers are attached as a SATA CD drive. Click OK and browse the CD drive for the storage driver to load. The drivers are arranged hierarchically according to their driver type, operating system, and CPU architecture.
- Repeat the previous two steps for all required drivers.
- Complete the Windows installation.
7.13.6. Removing the VirtIO container disk from a virtual machine
After installing all required VirtIO drivers to the virtual machine, the container-native-virtualization/virtio-win
container disk no longer needs to be attached to the virtual machine. Remove the container-native-virtualization/virtio-win
container disk from the virtual machine configuration file.
Procedure
Edit the configuration file and remove the
disk
and thevolume
.$ oc edit vm <vm-name>
spec: domain: devices: disks: - name: virtiocontainerdisk bootOrder: 2 cdrom: bus: sata volumes: - containerDisk: image: container-native-virtualization/virtio-win name: virtiocontainerdisk
- Reboot the virtual machine for the changes to take effect.
7.14. Advanced virtual machine management
7.14.1. Automating management tasks
You can automate OpenShift Virtualization management tasks by using Red Hat Ansible Automation Platform. Learn the basics by using an Ansible Playbook to create a new virtual machine.
7.14.1.1. About Red Hat Ansible Automation
Ansible is an automation tool used to configure systems, deploy software, and perform rolling updates. Ansible includes support for OpenShift Virtualization, and Ansible modules enable you to automate cluster management tasks such as template, persistent volume claim, and virtual machine operations.
Ansible provides a way to automate OpenShift Virtualization management, which you can also accomplish by using the oc
CLI tool or APIs. Ansible is unique because it allows you to integrate KubeVirt modules with other Ansible modules.
7.14.1.2. Automating virtual machine creation
You can use the kubevirt_vm
Ansible Playbook to create virtual machines in your OpenShift Container Platform cluster using Red Hat Ansible Automation Platform.
Prerequisites
- Red Hat Ansible Engine version 2.8 or newer
Procedure
Edit an Ansible Playbook YAML file so that it includes the
kubevirt_vm
task:kubevirt_vm: namespace: name: cpu_cores: memory: disks: - name: volume: containerDisk: image: disk: bus:
NoteThis snippet only includes the
kubevirt_vm
portion of the playbook.Edit the values to reflect the virtual machine you want to create, including the
namespace
, the number ofcpu_cores
, thememory
, and thedisks
. For example:kubevirt_vm: namespace: default name: vm1 cpu_cores: 1 memory: 64Mi disks: - name: containerdisk volume: containerDisk: image: kubevirt/cirros-container-disk-demo:latest disk: bus: virtio
If you want the virtual machine to boot immediately after creation, add
state: running
to the YAML file. For example:kubevirt_vm: namespace: default name: vm1 state: running 1 cpu_cores: 1
- 1
- Changing this value to
state: absent
deletes the virtual machine, if it already exists.
Run the
ansible-playbook
command, using your playbook’s file name as the only argument:$ ansible-playbook create-vm.yaml
Review the output to determine if the play was successful:
Example output
(...) TASK [Create my first VM] ************************************************************************ changed: [localhost] PLAY RECAP ******************************************************************************************************** localhost : ok=2 changed=1 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
If you did not include
state: running
in your playbook file and you want to boot the VM now, edit the file so that it includesstate: running
and run the playbook again:$ ansible-playbook create-vm.yaml
To verify that the virtual machine was created, try to access the VM console.
7.14.1.3. Example: Ansible Playbook for creating virtual machines
You can use the kubevirt_vm
Ansible Playbook to automate virtual machine creation.
The following YAML file is an example of the kubevirt_vm
playbook. It includes sample values that you must replace with your own information if you run the playbook.
--- - name: Ansible Playbook 1 hosts: localhost connection: local tasks: - name: Create my first VM kubevirt_vm: namespace: default name: vm1 cpu_cores: 1 memory: 64Mi disks: - name: containerdisk volume: containerDisk: image: kubevirt/cirros-container-disk-demo:latest disk: bus: virtio
Additional information
7.14.2. Using EFI mode for virtual machines
You can boot a virtual machine (VM) in Extensible Firmware Interface (EFI) mode.
7.14.2.1. About EFI mode for virtual machines
Extensible Firmware Interface (EFI), like legacy BIOS, initializes hardware components and operating system image files when a computer starts. EFI supports more modern features and customization options than BIOS, enabling faster boot times.
It stores all the information about initialization and startup in a file with a .efi
extension, which is stored on a special partition called EFI System Partition (ESP). The ESP also contains the boot loader programs for the operating system that is installed on the computer.
OpenShift Virtualization only supports a virtual machine (VM) with Secure Boot when using EFI mode. If Secure Boot is not enabled, the VM crashes repeatedly. However, the VM might not support Secure Boot. Before you boot a VM, verify that it supports Secure Boot by checking the VM settings.
7.14.2.2. Booting virtual machines in EFI mode
You can configure a virtual machine to boot in EFI mode by editing the VM or VMI manifest.
Prerequisites
-
Install the OpenShift CLI (
oc
).
Procedure
Create a YAML file that defines a VM object or a Virtual Machine Instance (VMI) object. Use the firmware stanza of the example YAML file:
Booting in EFI mode with secure boot active
apiversion: kubevirt.io/v1 kind: VirtualMachineInstance metadata: labels: special: vmi-secureboot name: vmi-secureboot spec: domain: devices: disks: - disk: bus: virtio name: containerdisk features: acpi: {} smm: enabled: true 1 firmware: bootloader: efi: secureBoot: true 2 ...
- 1
- OpenShift Virtualization requires System Management Mode (
SMM
) to be enabled for Secure Boot in EFI mode to occur. - 2
- OpenShift Virtualization only supports a virtual machine (VM) with Secure Boot when using EFI mode. If Secure Boot is not enabled, the VM crashes repeatedly. However, the VM might not support Secure Boot. Before you boot a VM, verify that it supports Secure Boot by checking the VM settings.
Apply the manifest to your cluster by running the following command:
$ oc create -f <file_name>.yaml
7.14.3. Configuring PXE booting for virtual machines
PXE booting, or network booting, is available in OpenShift Virtualization. Network booting allows a computer to boot and load an operating system or other program without requiring a locally attached storage device. For example, you can use it to choose your desired OS image from a PXE server when deploying a new host.
7.14.3.1. Prerequisites
- A Linux bridge must be connected.
- The PXE server must be connected to the same VLAN as the bridge.
7.14.3.2. PXE booting with a specified MAC address
As an administrator, you can boot a client over the network by first creating a NetworkAttachmentDefinition
object for your PXE network. Then, reference the network attachment definition in your virtual machine instance configuration file before you start the virtual machine instance. You can also specify a MAC address in the virtual machine instance configuration file, if required by the PXE server.
Prerequisites
- A Linux bridge must be connected.
- The PXE server must be connected to the same VLAN as the bridge.
Procedure
Configure a PXE network on the cluster:
Create the network attachment definition file for PXE network
pxe-net-conf
:apiVersion: "k8s.cni.cncf.io/v1" kind: NetworkAttachmentDefinition metadata: name: pxe-net-conf spec: config: '{ "cniVersion": "0.3.1", "name": "pxe-net-conf", "plugins": [ { "type": "cnv-bridge", "bridge": "br1", "vlan": 1 1 }, { "type": "cnv-tuning" 2 } ] }'
NoteThe virtual machine instance will be attached to the bridge
br1
through an access port with the requested VLAN.
Create the network attachment definition by using the file you created in the previous step:
$ oc create -f pxe-net-conf.yaml
Edit the virtual machine instance configuration file to include the details of the interface and network.
Specify the network and MAC address, if required by the PXE server. If the MAC address is not specified, a value is assigned automatically. However, note that at this time, MAC addresses assigned automatically are not persistent.
Ensure that
bootOrder
is set to1
so that the interface boots first. In this example, the interface is connected to a network called<pxe-net>
:interfaces: - masquerade: {} name: default - bridge: {} name: pxe-net macAddress: de:00:00:00:00:de bootOrder: 1
NoteBoot order is global for interfaces and disks.
Assign a boot device number to the disk to ensure proper booting after operating system provisioning.
Set the disk
bootOrder
value to2
:devices: disks: - disk: bus: virtio name: containerdisk bootOrder: 2
Specify that the network is connected to the previously created network attachment definition. In this scenario,
<pxe-net>
is connected to the network attachment definition called<pxe-net-conf>
:networks: - name: default pod: {} - name: pxe-net multus: networkName: pxe-net-conf
Create the virtual machine instance:
$ oc create -f vmi-pxe-boot.yaml
Example output
virtualmachineinstance.kubevirt.io "vmi-pxe-boot" created
Wait for the virtual machine instance to run:
$ oc get vmi vmi-pxe-boot -o yaml | grep -i phase phase: Running
View the virtual machine instance using VNC:
$ virtctl vnc vmi-pxe-boot
- Watch the boot screen to verify that the PXE boot is successful.
Log in to the virtual machine instance:
$ virtctl console vmi-pxe-boot
Verify the interfaces and MAC address on the virtual machine and that the interface connected to the bridge has the specified MAC address. In this case, we used
eth1
for the PXE boot, without an IP address. The other interface,eth0
, got an IP address from OpenShift Container Platform.$ ip addr
Example output
... 3. eth1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000 link/ether de:00:00:00:00:de brd ff:ff:ff:ff:ff:ff
7.14.3.3. Template: Virtual machine instance configuration file for PXE booting
apiVersion: kubevirt.io/v1alpha3 kind: VirtualMachineInstance metadata: creationTimestamp: null labels: special: vmi-pxe-boot name: vmi-pxe-boot spec: domain: devices: disks: - disk: bus: virtio name: containerdisk bootOrder: 2 - disk: bus: virtio name: cloudinitdisk interfaces: - masquerade: {} name: default - bridge: {} name: pxe-net macAddress: de:00:00:00:00:de bootOrder: 1 machine: type: "" resources: requests: memory: 1024M networks: - name: default pod: {} - multus: networkName: pxe-net-conf name: pxe-net terminationGracePeriodSeconds: 0 volumes: - name: containerdisk containerDisk: image: kubevirt/fedora-cloud-container-disk-demo - cloudInitNoCloud: userData: | #!/bin/bash echo "fedora" | passwd fedora --stdin name: cloudinitdisk status: {}
7.14.3.4. OpenShift Virtualization networking glossary
OpenShift Virtualization provides advanced networking functionality by using custom resources and plug-ins.
The following terms are used throughout OpenShift Virtualization documentation:
- Container Network Interface (CNI)
- a Cloud Native Computing Foundation project, focused on container network connectivity. OpenShift Virtualization uses CNI plug-ins to build upon the basic Kubernetes networking functionality.
- Multus
- a "meta" CNI plug-in that allows multiple CNIs to exist so that a pod or virtual machine can use the interfaces it needs.
- Custom resource definition (CRD)
- a Kubernetes API resource that allows you to define custom resources, or an object defined by using the CRD API resource.
- Network attachment definition
- a CRD introduced by the Multus project that allows you to attach pods, virtual machines, and virtual machine instances to one or more networks.
- Preboot eXecution Environment (PXE)
- an interface that enables an administrator to boot a client machine from a server over the network. Network booting allows you to remotely load operating systems and other software onto the client.
7.14.4. Managing guest memory
If you want to adjust guest memory settings to suit a specific use case, you can do so by editing the guest’s YAML configuration file. OpenShift Virtualization allows you to configure guest memory overcommitment and disable guest memory overhead accounting.
The following procedures increase the chance that virtual machine processes will be killed due to memory pressure. Proceed only if you understand the risks.
7.14.4.1. Configuring guest memory overcommitment
If your virtual workload requires more memory than available, you can use memory overcommitment to allocate all or most of the host’s memory to your virtual machine instances (VMIs). Enabling memory overcommitment means that you can maximize resources that are normally reserved for the host.
For example, if the host has 32 GB RAM, you can use memory overcommitment to fit 8 virtual machines (VMs) with 4 GB RAM each. This allocation works under the assumption that the virtual machines will not use all of their memory at the same time.
Memory overcommitment increases the potential for virtual machine processes to be killed due to memory pressure (OOM killed).
The potential for a VM to be OOM killed varies based on your specific configuration, node memory, available swap space, virtual machine memory consumption, the use of kernel same-page merging (KSM), and other factors.
Procedure
To explicitly tell the virtual machine instance that it has more memory available than was requested from the cluster, edit the virtual machine configuration file and set
spec.domain.memory.guest
to a higher value thanspec.domain.resources.requests.memory
. This process is called memory overcommitment.In this example,
1024M
is requested from the cluster, but the virtual machine instance is told that it has2048M
available. As long as there is enough free memory available on the node, the virtual machine instance will consume up to 2048M.kind: VirtualMachine spec: template: domain: resources: requests: memory: 1024M memory: guest: 2048M
NoteThe same eviction rules as those for pods apply to the virtual machine instance if the node is under memory pressure.
Create the virtual machine:
$ oc create -f <file_name>.yaml
7.14.4.2. Disabling guest memory overhead accounting
A small amount of memory is requested by each virtual machine instance in addition to the amount that you request. This additional memory is used for the infrastructure that wraps each VirtualMachineInstance
process.
Though it is not usually advisable, it is possible to increase the virtual machine instance density on the node by disabling guest memory overhead accounting.
Disabling guest memory overhead accounting increases the potential for virtual machine processes to be killed due to memory pressure (OOM killed).
The potential for a VM to be OOM killed varies based on your specific configuration, node memory, available swap space, virtual machine memory consumption, the use of kernel same-page merging (KSM), and other factors.
Procedure
To disable guest memory overhead accounting, edit the YAML configuration file and set the
overcommitGuestOverhead
value totrue
. This parameter is disabled by default.kind: VirtualMachine spec: template: domain: resources: overcommitGuestOverhead: true requests: memory: 1024M
NoteIf
overcommitGuestOverhead
is enabled, it adds the guest overhead to memory limits, if present.Create the virtual machine:
$ oc create -f <file_name>.yaml
7.14.5. Using huge pages with virtual machines
You can use huge pages as backing memory for virtual machines in your cluster.
7.14.5.1. Prerequisites
- Nodes must have pre-allocated huge pages configured.
7.14.5.2. What huge pages do
Memory is managed in blocks known as pages. On most systems, a page is 4Ki. 1Mi of memory is equal to 256 pages; 1Gi of memory is 256,000 pages, and so on. CPUs have a built-in memory management unit that manages a list of these pages in hardware. The Translation Lookaside Buffer (TLB) is a small hardware cache of virtual-to-physical page mappings. If the virtual address passed in a hardware instruction can be found in the TLB, the mapping can be determined quickly. If not, a TLB miss occurs, and the system falls back to slower, software-based address translation, resulting in performance issues. Since the size of the TLB is fixed, the only way to reduce the chance of a TLB miss is to increase the page size.
A huge page is a memory page that is larger than 4Ki. On x86_64 architectures, there are two common huge page sizes: 2Mi and 1Gi. Sizes vary on other architectures. To use huge pages, code must be written so that applications are aware of them. Transparent Huge Pages (THP) attempt to automate the management of huge pages without application knowledge, but they have limitations. In particular, they are limited to 2Mi page sizes. THP can lead to performance degradation on nodes with high memory utilization or fragmentation due to defragmenting efforts of THP, which can lock memory pages. For this reason, some applications may be designed to (or recommend) usage of pre-allocated huge pages instead of THP.
In OpenShift Virtualization, virtual machines can be configured to consume pre-allocated huge pages.
7.14.5.3. Configuring huge pages for virtual machines
You can configure virtual machines to use pre-allocated huge pages by including the memory.hugepages.pageSize
and resources.requests.memory
parameters in your virtual machine configuration.
The memory request must be divisible by the page size. For example, you cannot request 500Mi
memory with a page size of 1Gi
.
The memory layouts of the host and the guest OS are unrelated. Huge pages requested in the virtual machine manifest apply to QEMU. Huge pages inside the guest can only be configured based on the amount of available memory of the virtual machine instance.
If you edit a running virtual machine, the virtual machine must be rebooted for the changes to take effect.
Prerequisites
- Nodes must have pre-allocated huge pages configured.
Procedure
In your virtual machine configuration, add the
resources.requests.memory
andmemory.hugepages.pageSize
parameters to thespec.domain
. The following configuration snippet is for a virtual machine that requests a total of4Gi
memory with a page size of1Gi
:kind: VirtualMachine ... spec: domain: resources: requests: memory: "4Gi" 1 memory: hugepages: pageSize: "1Gi" 2 ...
Apply the virtual machine configuration:
$ oc apply -f <virtual_machine>.yaml
7.14.6. Enabling dedicated resources for virtual machines
To improve performance, you can dedicate node resources, such as CPU, to a virtual machine.
7.14.6.1. About dedicated resources
When you enable dedicated resources for your virtual machine, your virtual machine’s workload is scheduled on CPUs that will not be used by other processes. By using dedicated resources, you can improve the performance of the virtual machine and the accuracy of latency predictions.
7.14.6.2. Prerequisites
-
The CPU Manager must be configured on the node. Verify that the node has the
cpumanager = true
label before scheduling virtual machine workloads. - The virtual machine must be powered off.
7.14.6.3. Enabling dedicated resources for a virtual machine
You can enable dedicated resources for a virtual machine in the Details tab. Virtual machines that were created by using a Red Hat template or the wizard can be enabled with dedicated resources.
Procedure
- Click Workloads → Virtual Machines from the side menu.
- Select a virtual machine to open the Virtual Machine tab.
- Click the Details tab.
- Click the pencil icon to the right of the Dedicated Resources field to open the Dedicated Resources window.
- Select Schedule this workload with dedicated resources (guaranteed policy).
- Click Save.
7.14.7. Scheduling virtual machines
You can schedule a virtual machine (VM) on a node by ensuring that the VM’s CPU model and policy attribute are matched for compatibility with the CPU models and policy attributes supported by the node.
7.14.7.1. Understanding policy attributes
You can schedule a virtual machine (VM) by specifying a policy attribute and a CPU feature that is matched for compatibility when the VM is scheduled on a node. A policy attribute specified for a VM determines how that VM is scheduled on a node.
Policy attribute | Description |
---|---|
force | The VM is forced to be scheduled on a node. This is true even if the host CPU does not support the VM’s CPU. |
require | Default policy that applies to a VM if the VM is not configured with a specific CPU model and feature specification. If a node is not configured to support CPU node discovery with this default policy attribute or any one of the other policy attributes, VMs are not scheduled on that node. Either the host CPU must support the VM’s CPU or the hypervisor must be able to emulate the supported CPU model. |
optional | The VM is added to a node if that VM is supported by the host’s physical machine CPU. |
disable | The VM cannot be scheduled with CPU node discovery. |
forbid | The VM is not scheduled even if the feature is supported by the host CPU and CPU node discovery is enabled. |
7.14.7.2. Setting a policy attribute and CPU feature
You can set a policy attribute and CPU feature for each virtual machine (VM) to ensure that it is scheduled on a node according to policy and feature. The CPU feature that you set is verified to ensure that it is supported by the host CPU or emulated by the hypervisor.
Procedure
Edit the
domain
spec of your VM configuration file. The following example sets the CPU feature and therequire
policy for a virtual machine instance (VMI):apiVersion: kubevirt.io/v1alpha3 kind: VirtualMachine metadata: name: myvmi spec: domain: cpu: features: - name: apic 1 policy: require 2
7.14.7.3. Scheduling virtual machines with the supported CPU model
You can configure a CPU model for a virtual machine (VM) or a virtual machine instance (VMI) to schedule it on a node where its CPU model is supported.
Procedure
Edit the
domain
spec of your virtual machine configuration file. The following example shows a specific CPU model defined for a VMI:apiVersion: kubevirt.io/v1alpha3 kind: VirtualMachineInstance metadata: name: myvmi spec: domain: cpu: model: Conroe 1
- 1
- CPU model for the VMI.
7.14.7.4. Scheduling virtual machines with the host model
When the CPU model for a virtual machine (VM) is set to host-model
, the VM inherits the CPU model of the node where it is scheduled.
Procedure
Edit the
domain
spec of your VM configuration file. The following example showshost-model
being specified for the virtual machine instance (VMI):apiVersion: kubevirt/v1alpha3 kind: VirtualMachineInstance metadata: name: myvmi spec: domain: cpu: model: host-model 1
- 1
- The VM or VMI that inherits the CPU model of the node where it is scheduled.
7.15. Importing virtual machines
7.15.1. TLS certificates for data volume imports
7.15.1.1. Adding TLS certificates for authenticating data volume imports
TLS certificates for registry or HTTPS endpoints must be added to a config map to import data from these sources. This config map must be present in the namespace of the destination data volume.
Create the config map by referencing the relative file path for the TLS certificate.
Procedure
Ensure you are in the correct namespace. The config map can only be referenced by data volumes if it is in the same namespace.
$ oc get ns
Create the config map:
$ oc create configmap <configmap-name> --from-file=</path/to/file/ca.pem>
7.15.1.2. Example: Config map created from a TLS certificate
The following example is of a config map created from ca.pem
TLS certificate.
apiVersion: v1 kind: ConfigMap metadata: name: tls-certs data: ca.pem: | -----BEGIN CERTIFICATE----- ... <base64 encoded cert> ... -----END CERTIFICATE-----
7.15.2. Importing virtual machine images with data volumes
Use the Containerized Data Importer (CDI) to import a virtual machine image into a persistent volume claim (PVC) by using a data volume. You can attach a data volume to a virtual machine for persistent storage.
The virtual machine image can be hosted at an HTTP or HTTPS endpoint, or built into a container disk and stored in a container registry.
When you import a disk image into a PVC, the disk image is expanded to use the full storage capacity that is requested in the PVC. To use this space, the disk partitions and file system(s) in the virtual machine might need to be expanded.
The resizing procedure varies based on the operating system installed on the virtual machine. Refer to the operating system documentation for details.
7.15.2.1. Prerequisites
- If the endpoint requires a TLS certificate, the certificate must be included in a config map in the same namespace as the data volume and referenced in the data volume configuration.
To import a container disk:
- You might need to prepare a container disk from a virtual machine image and store it in your container registry before importing it.
-
If the container registry does not have TLS, you must add the registry to the
cdi-insecure-registries
config map before you can import a container disk from it.
- You might need to define a storage class or prepare CDI scratch space for this operation to complete successfully.
7.15.2.2. CDI supported operations matrix
This matrix shows the supported CDI operations for content types against endpoints, and which of these operations requires scratch space.
Content types | HTTP | HTTPS | HTTP basic auth | Registry | Upload |
---|---|---|---|---|---|
KubeVirt(QCOW2) |
✓ QCOW2 |
✓ QCOW2** |
✓ QCOW2 |
✓ QCOW2* |
✓ QCOW2* |
KubeVirt (RAW) |
✓ RAW |
✓ RAW |
✓ RAW |
✓ RAW* |
✓ RAW* |
✓ Supported operation
□ Unsupported operation
* Requires scratch space
** Requires scratch space if a custom certificate authority is required
7.15.2.3. About data volumes
DataVolume
objects are custom resources that are provided by the Containerized Data Importer (CDI) project. Data volumes orchestrate import, clone, and upload operations that are associated with an underlying persistent volume claim (PVC). Data volumes are integrated with OpenShift Virtualization, and they prevent a virtual machine from being started before the PVC has been prepared.
7.15.2.4. Importing a virtual machine image into storage by using a data volume
You can import a virtual machine image into storage by using a data volume.
The virtual machine image can be hosted at an HTTP or HTTPS endpoint or the image can be built into a container disk and stored in a container registry.
You specify the data source for the image in a VirtualMachine
configuration file. When the virtual machine is created, the data volume with the virtual machine image is imported into storage.
Prerequisites
To import a virtual machine image you must have the following:
-
A virtual machine disk image in RAW, ISO, or QCOW2 format, optionally compressed by using
xz
orgz
. - An HTTP or HTTPS endpoint where the image is hosted, along with any authentication credentials needed to access the data source.
-
A virtual machine disk image in RAW, ISO, or QCOW2 format, optionally compressed by using
- To import a container disk, you must have a virtual machine image built into a container disk and stored in a container registry, along with any authentication credentials needed to access the data source.
- If the virtual machine must communicate with servers that use self-signed certificates or certificates not signed by the system CA bundle, you must create a config map in the same namespace as the data volume.
Procedure
If your data source requires authentication, create a
Secret
manifest, specifying the data source credentials, and save it asendpoint-secret.yaml
:apiVersion: v1 kind: Secret metadata: name: endpoint-secret 1 labels: app: containerized-data-importer type: Opaque data: accessKeyId: "" 2 secretKey: "" 3
Apply the
Secret
manifest:$ oc apply -f endpoint-secret.yaml
Edit the
VirtualMachine
manifest, specifying the data source for the virtual machine image you want to import, and save it asvm-fedora-datavolume.yaml
:apiVersion: kubevirt.io/v1alpha3 kind: VirtualMachine metadata: creationTimestamp: null labels: kubevirt.io/vm: vm-fedora-datavolume name: vm-fedora-datavolume 1 spec: dataVolumeTemplates: - metadata: creationTimestamp: null name: fedora-dv 2 spec: storage: resources: requests: storage: 10Gi storageClassName: local source: http: 3 url: "https://mirror.arizona.edu/fedora/linux/releases/35/Cloud/x86_64/images/Fedora-Cloud-Base-35-1.2.x86_64.qcow2" 4 secretRef: endpoint-secret 5 certConfigMap: "" 6 status: {} running: true template: metadata: creationTimestamp: null labels: kubevirt.io/vm: vm-fedora-datavolume spec: domain: devices: disks: - disk: bus: virtio name: datavolumedisk1 machine: type: "" resources: requests: memory: 1.5Gi terminationGracePeriodSeconds: 60 volumes: - dataVolume: name: fedora-dv name: datavolumedisk1 status: {}
- 1
- Specify the name of the virtual machine.
- 2
- Specify the name of the data volume.
- 3
- Specify
http
for an HTTP or HTTPS endpoint. Specifyregistry
for a container disk image imported from a registry. - 4
- The source of the virtual machine image you want to import. This example references a virtual machine image at an HTTPS endpoint. An example of a container registry endpoint is
url: "docker://kubevirt/fedora-cloud-container-disk-demo:latest"
. - 5
- Required if you created a
Secret
for the data source. - 6
- Optional: Specify a CA certificate config map.
Create the virtual machine:
$ oc create -f vm-fedora-datavolume.yaml
NoteThe
oc create
command creates the data volume and the virtual machine. The CDI controller creates an underlying PVC with the correct annotation and the import process begins. When the import is complete, the data volume status changes toSucceeded
. You can start the virtual machine.Data volume provisioning happens in the background, so there is no need to monitor the process.
Verification
The importer pod downloads the virtual machine image or container disk from the specified URL and stores it on the provisioned PV. View the status of the importer pod by running the following command:
$ oc get pods
Monitor the data volume until its status is
Succeeded
by running the following command:$ oc describe dv fedora-dv 1
- 1
- Specify the data volume name that you defined in the
VirtualMachine
manifest.
Verify that provisioning is complete and that the virtual machine has started by accessing its serial console:
$ virtctl console vm-fedora-datavolume
7.15.2.5. Additional resources
- Configure preallocation mode to improve write performance for data volume operations.
7.15.3. Importing virtual machine images into block storage with data volumes
You can import an existing virtual machine image into your OpenShift Container Platform cluster. OpenShift Virtualization uses data volumes to automate the import of data and the creation of an underlying persistent volume claim (PVC).
When you import a disk image into a PVC, the disk image is expanded to use the full storage capacity that is requested in the PVC. To use this space, the disk partitions and file system(s) in the virtual machine might need to be expanded.
The resizing procedure varies based on the operating system that is installed on the virtual machine. Refer to the operating system documentation for details.
7.15.3.1. Prerequisites
- If you require scratch space according to the CDI supported operations matrix, you must first define a storage class or prepare CDI scratch space for this operation to complete successfully.
7.15.3.2. About data volumes
DataVolume
objects are custom resources that are provided by the Containerized Data Importer (CDI) project. Data volumes orchestrate import, clone, and upload operations that are associated with an underlying persistent volume claim (PVC). Data volumes are integrated with OpenShift Virtualization, and they prevent a virtual machine from being started before the PVC has been prepared.
7.15.3.3. About block persistent volumes
A block persistent volume (PV) is a PV that is backed by a raw block device. These volumes do not have a file system and can provide performance benefits for virtual machines by reducing overhead.
Raw block volumes are provisioned by specifying volumeMode: Block
in the PV and persistent volume claim (PVC) specification.
7.15.3.4. Creating a local block persistent volume
Create a local block persistent volume (PV) on a node by populating a file and mounting it as a loop device. You can then reference this loop device in a PV manifest as a Block
volume and use it as a block device for a virtual machine image.
Procedure
-
Log in as
root
to the node on which to create the local PV. This procedure usesnode01
for its examples. Create a file and populate it with null characters so that it can be used as a block device. The following example creates a file
loop10
with a size of 2Gb (20 100Mb blocks):$ dd if=/dev/zero of=<loop10> bs=100M count=20
Mount the
loop10
file as a loop device.$ losetup </dev/loop10>d3 <loop10> 1 2
Create a
PersistentVolume
manifest that references the mounted loop device.kind: PersistentVolume apiVersion: v1 metadata: name: <local-block-pv10> annotations: spec: local: path: </dev/loop10> 1 capacity: storage: <2Gi> volumeMode: Block 2 storageClassName: local 3 accessModes: - ReadWriteOnce persistentVolumeReclaimPolicy: Delete nodeAffinity: required: nodeSelectorTerms: - matchExpressions: - key: kubernetes.io/hostname operator: In values: - <node01> 4
Create the block PV.
# oc create -f <local-block-pv10.yaml>1
- 1
- The file name of the persistent volume created in the previous step.
7.15.3.5. Importing a virtual machine image into block storage by using a data volume
You can import a virtual machine image into block storage by using a data volume. You reference the data volume in a VirtualMachine
manifest before you create a virtual machine.
Prerequisites
-
A virtual machine disk image in RAW, ISO, or QCOW2 format, optionally compressed by using
xz
orgz
. - An HTTP or HTTPS endpoint where the image is hosted, along with any authentication credentials needed to access the data source.
Procedure
If your data source requires authentication, create a
Secret
manifest, specifying the data source credentials, and save it asendpoint-secret.yaml
:apiVersion: v1 kind: Secret metadata: name: endpoint-secret 1 labels: app: containerized-data-importer type: Opaque data: accessKeyId: "" 2 secretKey: "" 3
Apply the
Secret
manifest:$ oc apply -f endpoint-secret.yaml
Create a
DataVolume
manifest, specifying the data source for the virtual machine image andBlock
forstorage.volumeMode
.apiVersion: cdi.kubevirt.io/v1beta1 kind: DataVolume metadata: name: import-pv-datavolume 1 spec: storageClassName: local 2 source: http: url: "https://mirror.arizona.edu/fedora/linux/releases/35/Cloud/x86_64/images/Fedora-Cloud-Base-35-1.2.x86_64.qcow2" 3 secretRef: endpoint-secret 4 storage: volumeMode: Block 5 resources: requests: storage: 10Gi
- 1
- Specify the name of the data volume.
- 2
- Optional: Set the storage class or omit it to accept the cluster default.
- 3
- Specify the HTTP or HTTPS URL of the image to import.
- 4
- Required if you created a
Secret
for the data source. - 5
- The volume mode and access mode are detected automatically for known storage provisioners. Otherwise, specify
Block
.
Create the data volume to import the virtual machine image:
$ oc create -f import-pv-datavolume.yaml
You can reference this data volume in a VirtualMachine
manifest before you create a virtual machine.
7.15.3.6. CDI supported operations matrix
This matrix shows the supported CDI operations for content types against endpoints, and which of these operations requires scratch space.
Content types | HTTP | HTTPS | HTTP basic auth | Registry | Upload |
---|---|---|---|---|---|
KubeVirt(QCOW2) |
✓ QCOW2 |
✓ QCOW2** |
✓ QCOW2 |
✓ QCOW2* |
✓ QCOW2* |
KubeVirt (RAW) |
✓ RAW |
✓ RAW |
✓ RAW |
✓ RAW* |
✓ RAW* |
✓ Supported operation
□ Unsupported operation
* Requires scratch space
** Requires scratch space if a custom certificate authority is required
7.15.3.7. Additional resources
- Configure preallocation mode to improve write performance for data volume operations.
7.15.4. Importing a single Red Hat Virtualization virtual machine
You can import a single Red Hat Virtualization (RHV) virtual machine into OpenShift Virtualization by using the VM Import wizard or the CLI.
7.15.4.1. OpenShift Virtualization storage feature matrix
The following table describes the OpenShift Virtualization storage types that support VM import.
RHV VM import | |
---|---|
OpenShift Container Storage: RBD block-mode volumes | Yes |
OpenShift Virtualization hostpath provisioner | No |
Other multi-node writable storage | Yes [1] |
Other single-node writable storage | Yes [2] |
- PVCs must request a ReadWriteMany access mode.
- PVCs must request a ReadWriteOnce access mode.
7.15.4.2. Prerequisites for importing a virtual machine
Importing a virtual machine from Red Hat Virtualization (RHV) into OpenShift Virtualization has the following prerequisites:
- You must have admin user privileges.
Storage:
- The OpenShift Virtualization local and shared persistent storage classes must support VM import.
- If you are using Ceph RBD block-mode volumes and the available storage space is too small for the virtual disk, the import process bar stops at 75% for more than 20 minutes and the migration does not succeed. No error message is displayed in the web console. BZ#1910019
Networks:
- The RHV and OpenShift Virtualization networks must either have the same name or be mapped to each other.
-
The RHV VM network interface must be
e1000
,rtl8139
, orvirtio
.
VM disks:
-
The disk interface must be
sata
,virtio_scsi
, orvirtio
. - The disk must not be configured as a direct LUN.
-
The disk status must not be
illegal
orlocked
. -
The storage type must be
image
. - SCSI reservation must be disabled.
-
ScsiGenericIO
must be disabled.
-
The disk interface must be
VM configuration:
- If the VM uses GPU resources, the nodes providing the GPUs must be configured.
- The VM must not be configured for vGPU resources.
-
The VM must not have snapshots with disks in an
illegal
state. - The VM must not have been created with OpenShift Container Platform and subsequently added to RHV.
- The VM must not be configured for USB devices.
-
The watchdog model must not be
diag288
.
7.15.4.3. Importing a virtual machine with the VM Import wizard
You can import a single virtual machine with the VM Import wizard.
Procedure
- In the web console, click Workloads → Virtual Machines.
- Click Create Virtual Machine and select Import with Wizard.
- Select Red Hat Virtualization (RHV) from the Provider list.
Select Connect to New Instance or a saved RHV instance.
If you select Connect to New Instance, fill in the following fields:
-
API URL: For example,
https://<RHV_Manager_FQDN>/ovirt-engine/api
CA certificate: Click Browse to upload the RHV Manager CA certificate or paste the CA certificate into the field.
View the CA certificate by running the following command:
$ openssl s_client -connect <RHV_Manager_FQDN>:443 -showcerts < /dev/null
The CA certificate is the second certificate in the output.
-
Username: RHV Manager user name, for example,
ocpadmin@internal
- Password: RHV Manager password
-
API URL: For example,
- If you select a saved RHV instance, the wizard connects to the RHV instance using the saved credentials.
Click Check and Save and wait for the connection to complete.
NoteThe connection details are stored in a secret. If you add a provider with an incorrect URL, user name, or password, click Workloads → Secrets and delete the provider secret.
- Select a cluster and a virtual machine.
- Click Next.
- In the Review screen, review your settings.
- Optional: You can select Start virtual machine on creation.
Click Edit to update the following settings:
- General → Name: The VM name is limited to 63 characters.
General → Description: Optional description of the VM.
Storage Class: Select NFS or ocs-storagecluster-ceph-rbd.
If you select ocs-storagecluster-ceph-rbd, you must set the Volume Mode of the disk to Block.
- Advanced → Volume Mode: Select Block.
- Advanced → Volume Mode: Select Block.
- Networking → Network: You can select a network from a list of available network attachment definition objects.
Click Import or Review and Import, if you have edited the import settings.
A Successfully created virtual machine message and a list of resources created for the virtual machine are displayed. The virtual machine appears in Workloads → Virtual Machines.
Virtual machine wizard fields
Name | Parameter | Description |
---|---|---|
Name |
The name can contain lowercase letters ( | |
Description | Optional description field. | |
Operating System | The primary operating system that is selected for the virtual machine in the template. You cannot edit this field when creating a virtual machine from a template. | |
Boot Source | Import via URL (creates PVC) | Import content from an image available from an HTTP or HTTPS endpoint. Example: Obtaining a URL link from the web page with the operating system image. |
Clone existing PVC (creates PVC) | Select an existent persistent volume claim available on the cluster and clone it. | |
Import via Registry (creates PVC) |
Provision virtual machine from a bootable operating system container located in a registry accessible from the cluster. Example: | |
PXE (network boot - adds network interface) | Boot an operating system from a server on the network. Requires a PXE bootable network attachment definition. | |
Persistent Volume Claim project | Project name that you want to use for cloning the PVC. | |
Persistent Volume Claim name | PVC name that should apply to this virtual machine template if you are cloning an existing PVC. | |
Mount this as a CD-ROM boot source | A CD-ROM requires an additional disk for installing the operating system. Select the checkbox to add a disk and customize it later. | |
Flavor | Tiny, Small, Medium, Large, Custom | Presets that determine the amount of CPU and memory allocated to the virtual machine. The presets displayed for Flavor are determined by the operating system. |
Workload Type | Desktop | A virtual machine configuration for use on a desktop. Ideal for consumption on a small scale. Recommended for use with the web console. |
Server | Balances performance and it is compatible with a wide range of server workloads. | |
High-Performance | A virtual machine configuration that is optimized for high-performance workloads. | |
Start this virtual machine after creation. | This checkbox is selected by default and the virtual machine starts running after creation. Clear the checkbox if you do not want the virtual machine to start when it is created. |
Networking fields
Name | Description |
---|---|
Name | Name for the network interface controller. |
Model | Indicates the model of the network interface controller. Supported values are e1000e and virtio. |
Network | List of available network attachment definitions. |
Type |
List of available binding methods. For the default pod network, |
MAC Address | MAC address for the network interface controller. If a MAC address is not specified, one is assigned automatically. |
Storage fields
Name | Selection | Description |
---|---|---|
Source | Blank (creates PVC) | Create an empty disk. |
Import via URL (creates PVC) | Import content via URL (HTTP or HTTPS endpoint). | |
Use an existing PVC | Use a PVC that is already available in the cluster. | |
Clone existing PVC (creates PVC) | Select an existing PVC available in the cluster and clone it. | |
Import via Registry (creates PVC) | Import content via container registry. | |
Container (ephemeral) | Upload content from a container located in a registry accessible from the cluster. The container disk should be used only for read-only filesystems such as CD-ROMs or temporary virtual machines. | |
Name |
Name of the disk. The name can contain lowercase letters ( | |
Size | Size of the disk in GiB. | |
Type | Type of disk. Example: Disk or CD-ROM | |
Interface | Type of disk device. Supported interfaces are virtIO, SATA, and SCSI. | |
Storage Class | The storage class that is used to create the disk. | |
Advanced → Volume Mode | Defines whether the persistent volume uses a formatted file system or raw block state. Default is Filesystem. |
Advanced storage settings
Name | Parameter | Description |
---|---|---|
Volume Mode | Filesystem | Stores the virtual disk on a file system-based volume. |
Block |
Stores the virtual disk directly on the block volume. Only use | |
Access Mode [1] | Single User (RWO) | The disk can be mounted as read/write by a single node. |
Shared Access (RWX) | The disk can be mounted as read/write by many nodes. | |
Read Only (ROX) | The disk can be mounted as read-only by many nodes. |
- You can change the access mode by using the command line interface.
7.15.4.4. Importing a virtual machine with the CLI
You can import a virtual machine with the CLI by creating the Secret
and VirtualMachineImport
custom resources (CRs). The Secret
CR stores the RHV Manager credentials and CA certificate. The VirtualMachineImport
CR defines the parameters of the VM import process.
Optional: You can create a ResourceMapping
CR that is separate from the VirtualMachineImport
CR. A ResourceMapping
CR provides greater flexibility, for example, if you import additional RHV VMs.
The default target storage class must be NFS. Cinder does not support RHV VM import.
Procedure
Create the
Secret
CR by running the following command:$ cat <<EOF | oc create -f - apiVersion: v1 kind: Secret metadata: name: rhv-credentials namespace: default 1 type: Opaque stringData: ovirt: | apiUrl: <api_endpoint> 2 username: ocpadmin@internal password: 3 caCert: | -----BEGIN CERTIFICATE----- 4 -----END CERTIFICATE----- EOF
- 1
- Optional. You can specify a different namespace in all the CRs.
- 2
- Specify the API endpoint of the RHV Manager, for example,
\"https://www.example.com:8443/ovirt-engine/api"
- 3
- Specify the password for
ocpadmin@internal
. - 4
- Specify the RHV Manager CA certificate. You can obtain the CA certificate by running the following command:
$ openssl s_client -connect :443 -showcerts < /dev/null
Optional: Create a
ResourceMapping
CR if you want to separate the resource mapping from theVirtualMachineImport
CR by running the following command:$ cat <<EOF | kubectl create -f - apiVersion: v2v.kubevirt.io/v1alpha1 kind: ResourceMapping metadata: name: resourcemapping_example namespace: default spec: ovirt: networkMappings: - source: name: <rhv_logical_network>/<vnic_profile> 1 target: name: <target_network> 2 type: pod storageMappings: 3 - source: name: <rhv_storage_domain> 4 target: name: <target_storage_class> 5 volumeMode: <volume_mode> 6 EOF
- 1
- Specify the RHV logical network and vNIC profile.
- 2
- Specify the OpenShift Virtualization network.
- 3
- If storage mappings are specified in both the
ResourceMapping
and theVirtualMachineImport
CRs, theVirtualMachineImport
CR takes precedence. - 4
- Specify the RHV storage domain.
- 5
- Specify
nfs
orocs-storagecluster-ceph-rbd
. - 6
- If you specified the
ocs-storagecluster-ceph-rbd
storage class, you must specifyBlock
as the volume mode.
Create the
VirtualMachineImport
CR by running the following command:$ cat <<EOF | oc create -f - apiVersion: v2v.kubevirt.io/v1beta1 kind: VirtualMachineImport metadata: name: vm-import namespace: default spec: providerCredentialsSecret: name: rhv-credentials namespace: default # resourceMapping: 1 # name: resourcemapping-example # namespace: default targetVmName: vm_example 2 startVm: true source: ovirt: vm: id: <source_vm_id> 3 name: <source_vm_name> 4 cluster: name: <source_cluster_name> 5 mappings: 6 networkMappings: - source: name: <source_logical_network>/<vnic_profile> 7 target: name: <target_network> 8 type: pod storageMappings: 9 - source: name: <source_storage_domain> 10 target: name: <target_storage_class> 11 accessMode: <volume_access_mode> 12 diskMappings: - source: id: <source_vm_disk_id> 13 target: name: <target_storage_class> 14 EOF
- 1
- If you create a
ResourceMapping
CR, uncomment theresourceMapping
section. - 2
- Specify the target VM name.
- 3
- Specify the source VM ID, for example,
80554327-0569-496b-bdeb-fcbbf52b827b
. You can obtain the VM ID by enteringhttps://www.example.com/ovirt-engine/api/vms/
in a web browser on the Manager machine to list all VMs. Locate the VM you want to import and its corresponding VM ID. You do not need to specify a VM name or cluster name. - 4
- If you specify the source VM name, you must also specify the source cluster. Do not specify the source VM ID.
- 5
- If you specify the source cluster, you must also specify the source VM name. Do not specify the source VM ID.
- 6
- If you create a
ResourceMapping
CR, comment out themappings
section. - 7
- Specify the logical network and vNIC profile of the source VM.
- 8
- Specify the OpenShift Virtualization network.
- 9
- If storage mappings are specified in both the
ResourceMapping
and theVirtualMachineImport
CRs, theVirtualMachineImport
CR takes precedence. - 10
- Specify the source storage domain.
- 11
- Specify the target storage class.
- 12
- Specify
ReadWriteOnce
,ReadWriteMany
, orReadOnlyMany
. If no access mode is specified, {virt} determines the correct volume access mode based on the Host → Migration mode setting of the RHV VM or on the virtual disk access mode:-
If the RHV VM migration mode is
Allow manual and automatic migration
, the default access mode isReadWriteMany
. -
If the RHV virtual disk access mode is
ReadOnly
, the default access mode isReadOnlyMany
. -
For all other settings, the default access mode is
ReadWriteOnce
.
-
If the RHV VM migration mode is
- 13
- Specify the source VM disk ID, for example,
8181ecc1-5db8-4193-9c92-3ddab3be7b05
. You can obtain the disk ID by enteringhttps://www.example.com/ovirt-engine/api/vms/vm23
in a web browser on the Manager machine and reviewing the VM details. - 14
- Specify the target storage class.
Follow the progress of the virtual machine import to verify that the import was successful:
$ oc get vmimports vm-import -n default
The output indicating a successful import resembles the following example:
Example output
... status: conditions: - lastHeartbeatTime: "2020-07-22T08:58:52Z" lastTransitionTime: "2020-07-22T08:58:52Z" message: Validation completed successfully reason: ValidationCompleted status: "True" type: Valid - lastHeartbeatTime: "2020-07-22T08:58:52Z" lastTransitionTime: "2020-07-22T08:58:52Z" message: 'VM specifies IO Threads: 1, VM has NUMA tune mode specified: interleave' reason: MappingRulesVerificationReportedWarnings status: "True" type: MappingRulesVerified - lastHeartbeatTime: "2020-07-22T08:58:56Z" lastTransitionTime: "2020-07-22T08:58:52Z" message: Copying virtual machine disks reason: CopyingDisks status: "True" type: Processing dataVolumes: - name: fedora32-b870c429-11e0-4630-b3df-21da551a48c0 targetVmName: fedora32
7.15.4.4.1. Creating a config map for importing a VM
You can create a config map to map the Red Hat Virtualization (RHV) virtual machine operating system to an OpenShift Virtualization template if you want to override the default vm-import-controller
mapping or to add additional mappings.
The default vm-import-controller
config map contains the following RHV operating systems and their corresponding common OpenShift Virtualization templates.
RHV VM operating system | OpenShift Virtualization template |
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Procedure
In a web browser, identify the REST API name of the RHV VM operating system by navigating to
http://<RHV_Manager_FQDN>/ovirt-engine/api/vms/<VM_ID>
. The operating system name appears in the<os>
section of the XML output, as shown in the following example:... <os> ... <type>rhel_8x64</type> </os>
View a list of the available OpenShift Virtualization templates:
$ oc get templates -n openshift --show-labels | tr ',' '\n' | grep os.template.kubevirt.io | sed -r 's#os.template.kubevirt.io/(.*)=.*#\1#g' | sort -u
Example output
fedora31 fedora32 ... rhel8.1 rhel8.2 ...
- If an OpenShift Virtualization template that matches the RHV VM operating system does not appear in the list of available templates, create a template with the OpenShift Virtualization web console.
Create a config map to map the RHV VM operating system to the OpenShift Virtualization template:
$ cat <<EOF | oc create -f - apiVersion: v1 kind: ConfigMap metadata: name: os-configmap namespace: default 1 data: guestos2common: | "Red Hat Enterprise Linux Server": "rhel" "CentOS Linux": "centos" "Fedora": "fedora" "Ubuntu": "ubuntu" "openSUSE": "opensuse" osinfo2common: | "<rhv-operating-system>": "<vm-template>" 2 EOF
Config map example
$ cat <<EOF | oc apply -f - apiVersion: v1 kind: ConfigMap metadata: name: os-configmap namespace: default data: osinfo2common: | "other_linux": "fedora31" EOF
Verify that the custom config map was created:
$ oc get cm -n default os-configmap -o yaml
Patch the
vm-import-controller-config
config map to apply the new config map:$ oc patch configmap vm-import-controller-config -n openshift-cnv --patch '{ "data": { "osConfigMap.name": "os-configmap", "osConfigMap.namespace": "default" 1 } }'
- 1
- Update the namespace if you changed it in the config map.
Verify that the template appears in the OpenShift Virtualization web console:
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machine Templates tab and find the template in the list.
7.15.4.5. Troubleshooting a virtual machine import
7.15.4.5.1. Logs
You can check the VM Import Controller pod log for errors.
Procedure
View the VM Import Controller pod name by running the following command:
$ oc get pods -n <namespace> | grep import 1
- 1
- Specify the namespace of your imported virtual machine.
Example output
vm-import-controller-f66f7d-zqkz7 1/1 Running 0 4h49m
View the VM Import Controller pod log by running the following command:
$ oc logs <vm-import-controller-f66f7d-zqkz7> -f -n <namespace> 1
- 1
- Specify the VM Import Controller pod name and the namespace.
7.15.4.5.2. Error messages
The following error message might appear:
The following error message is displayed in the VM Import Controller pod log and the progress bar stops at 10% if the OpenShift Virtualization storage PV is not suitable:
Failed to bind volumes: provisioning failed for PVC
You must use a compatible storage class. The Cinder storage class is not supported.
7.15.4.5.3. Known issues
- If you are using Ceph RBD block-mode volumes and the available storage space is too small for the virtual disk, the import process bar stops at 75% for more than 20 minutes and the migration does not succeed. No error message is displayed in the web console. BZ#1910019
7.15.5. Importing a single VMware virtual machine or template
You can import a VMware vSphere 6.5, 6.7, or 7.0 VM or VM template into OpenShift Virtualization by using the VM Import wizard.
If you import a VM template, OpenShift Virtualization creates a virtual machine based on the template.
7.15.5.1. OpenShift Virtualization storage feature matrix
The following table describes the OpenShift Virtualization storage types that support VM import.
VMware VM import | |
---|---|
OpenShift Container Storage: RBD block-mode volumes | Yes |
OpenShift Virtualization hostpath provisioner | Yes |
Other multi-node writable storage | Yes [1] |
Other single-node writable storage | Yes [2] |
- PVCs must request a ReadWriteMany access mode.
- PVCs must request a ReadWriteOnce access mode.
7.15.5.2. Preparing a VDDK image
The import process uses the VMware Virtual Disk Development Kit (VDDK) to copy the VMware virtual disk.
You can download the VDDK SDK, create a VDDK image, upload the image to an image registry, and add it to the v2v-vmware
config map.
You can configure either an internal OpenShift Container Platform image registry or a secure external image registry for the VDDK image. The registry must be accessible to your OpenShift Virtualization environment.
Storing the VDDK image in a public registry might violate the terms of the VMware license.
7.15.5.2.1. Configuring an internal image registry
You can configure the internal OpenShift Container Platform image registry on bare metal by updating the Image Registry Operator configuration.
You can access the registry directly, from within the OpenShift Container Platform cluster, or externally, by exposing the registry with a route.
Changing the image registry’s management state
To start the image registry, you must change the Image Registry Operator configuration’s managementState
from Removed
to Managed
.
Procedure
Change
managementState
Image Registry Operator configuration fromRemoved
toManaged
. For example:$ oc patch configs.imageregistry.operator.openshift.io cluster --type merge --patch '{"spec":{"managementState":"Managed"}}'
Configuring registry storage for bare metal and other manual installations
As a cluster administrator, following installation you must configure your registry to use storage.
Prerequisites
- Cluster administrator permissions.
- A cluster that uses manually-provisioned Red Hat Enterprise Linux CoreOS (RHCOS) nodes, such as bare metal.
Persistent storage provisioned for your cluster, such as Red Hat OpenShift Container Storage.
ImportantOpenShift Container Platform supports
ReadWriteOnce
access for image registry storage when you have only one replica. To deploy an image registry that supports high availability with two or more replicas,ReadWriteMany
access is required.- Must have 100Gi capacity.
Procedure
To configure your registry to use storage, change the
spec.storage.pvc
in theconfigs.imageregistry/cluster
resource.NoteWhen using shared storage, review your security settings to prevent outside access.
Verify that you do not have a registry pod:
$ oc get pod -n openshift-image-registry -l docker-registry=default
Example output
No resourses found in openshift-image-registry namespace
NoteIf you do have a registry pod in your output, you do not need to continue with this procedure.
Check the registry configuration:
$ oc edit configs.imageregistry.operator.openshift.io
Example output
storage: pvc: claim:
Leave the
claim
field blank to allow the automatic creation of animage-registry-storage
PVC.Check the
clusteroperator
status:$ oc get clusteroperator image-registry
Example output
NAME VERSION AVAILABLE PROGRESSING DEGRADED SINCE MESSAGE image-registry 4.7 True False False 6h50m
Ensure that your registry is set to managed to enable building and pushing of images.
Run:
$ oc edit configs.imageregistry/cluster
Then, change the line
managementState: Removed
to
managementState: Managed
Accessing registry directly from the cluster
You can access the registry from inside the cluster.
Procedure
Access the registry from the cluster by using internal routes:
Access the node by getting the node’s name:
$ oc get nodes
$ oc debug nodes/<node_name>
To enable access to tools such as
oc
andpodman
on the node, run the following command:sh-4.2# chroot /host
Log in to the container image registry by using your access token:
sh-4.2# oc login -u kubeadmin -p <password_from_install_log> https://api-int.<cluster_name>.<base_domain>:6443
sh-4.2# podman login -u kubeadmin -p $(oc whoami -t) image-registry.openshift-image-registry.svc:5000
You should see a message confirming login, such as:
Login Succeeded!
NoteYou can pass any value for the user name; the token contains all necessary information. Passing a user name that contains colons will result in a login failure.
Since the Image Registry Operator creates the route, it will likely be similar to
default-route-openshift-image-registry.<cluster_name>
.Perform
podman pull
andpodman push
operations against your registry:ImportantYou can pull arbitrary images, but if you have the system:registry role added, you can only push images to the registry in your project.
In the following examples, use:
Component Value <registry_ip>
172.30.124.220
<port>
5000
<project>
openshift
<image>
image
<tag>
omitted (defaults to
latest
)Pull an arbitrary image:
sh-4.2# podman pull name.io/image
Tag the new image with the form
<registry_ip>:<port>/<project>/<image>
. The project name must appear in this pull specification for OpenShift Container Platform to correctly place and later access the image in the registry:sh-4.2# podman tag name.io/image image-registry.openshift-image-registry.svc:5000/openshift/image
NoteYou must have the
system:image-builder
role for the specified project, which allows the user to write or push an image. Otherwise, thepodman push
in the next step will fail. To test, you can create a new project to push the image.Push the newly tagged image to your registry:
sh-4.2# podman push image-registry.openshift-image-registry.svc:5000/openshift/image
Exposing a secure registry manually
Instead of logging in to the OpenShift Container Platform registry from within the cluster, you can gain external access to it by exposing it with a route. This allows you to log in to the registry from outside the cluster using the route address, and to tag and push images to an existing project by using the route host.
Prerequisites:
The following prerequisites are automatically performed:
- Deploy the Registry Operator.
- Deploy the Ingress Operator.
Procedure
You can expose the route by using DefaultRoute
parameter in the configs.imageregistry.operator.openshift.io
resource or by using custom routes.
To expose the registry using DefaultRoute
:
Set
DefaultRoute
toTrue
:$ oc patch configs.imageregistry.operator.openshift.io/cluster --patch '{"spec":{"defaultRoute":true}}' --type=merge
Log in with
podman
:$ HOST=$(oc get route default-route -n openshift-image-registry --template='{{ .spec.host }}')
$ podman login -u kubeadmin -p $(oc whoami -t) --tls-verify=false $HOST 1
- 1
--tls-verify=false
is needed if the cluster’s default certificate for routes is untrusted. You can set a custom, trusted certificate as the default certificate with the Ingress Operator.
To expose the registry using custom routes:
Create a secret with your route’s TLS keys:
$ oc create secret tls public-route-tls \ -n openshift-image-registry \ --cert=</path/to/tls.crt> \ --key=</path/to/tls.key>
This step is optional. If you do not create a secret, the route uses the default TLS configuration from the Ingress Operator.
On the Registry Operator:
spec: routes: - name: public-routes hostname: myregistry.mycorp.organization secretName: public-route-tls ...
NoteOnly set
secretName
if you are providing a custom TLS configuration for the registry’s route.
7.15.5.2.2. Configuring an external image registry
If you use an external image registry for the VDDK image, you can add the external image registry’s certificate authorities to the OpenShift Container Platform cluster.
Optionally, you can create a pull secret from your Docker credentials and add it to your service account.
Adding certificate authorities to the cluster
You can add certificate authorities (CA) to the cluster for use when pushing and pulling images with the following procedure.
Prerequisites
- You must have cluster administrator privileges.
-
You must have access to the public certificates of the registry, usually a
hostname/ca.crt
file located in the/etc/docker/certs.d/
directory.
Procedure
Create a
ConfigMap
in theopenshift-config
namespace containing the trusted certificates for the registries that use self-signed certificates. For each CA file, ensure the key in theConfigMap
is the hostname of the registry in thehostname[..port]
format:$ oc create configmap registry-cas -n openshift-config \ --from-file=myregistry.corp.com..5000=/etc/docker/certs.d/myregistry.corp.com:5000/ca.crt \ --from-file=otherregistry.com=/etc/docker/certs.d/otherregistry.com/ca.crt
Update the cluster image configuration:
$ oc patch image.config.openshift.io/cluster --patch '{"spec":{"additionalTrustedCA":{"name":"registry-cas"}}}' --type=merge
Allowing pods to reference images from other secured registries
The .dockercfg
$HOME/.docker/config.json
file for Docker clients is a Docker credentials file that stores your authentication information if you have previously logged into a secured or insecure registry.
To pull a secured container image that is not from OpenShift Container Platform’s internal registry, you must create a pull secret from your Docker credentials and add it to your service account.
Procedure
If you already have a
.dockercfg
file for the secured registry, you can create a secret from that file by running:$ oc create secret generic <pull_secret_name> \ --from-file=.dockercfg=<path/to/.dockercfg> \ --type=kubernetes.io/dockercfg
Or if you have a
$HOME/.docker/config.json
file:$ oc create secret generic <pull_secret_name> \ --from-file=.dockerconfigjson=<path/to/.docker/config.json> \ --type=kubernetes.io/dockerconfigjson
If you do not already have a Docker credentials file for the secured registry, you can create a secret by running:
$ oc create secret docker-registry <pull_secret_name> \ --docker-server=<registry_server> \ --docker-username=<user_name> \ --docker-password=<password> \ --docker-email=<email>
To use a secret for pulling images for pods, you must add the secret to your service account. The name of the service account in this example should match the name of the service account the pod uses. The default service account is
default
:$ oc secrets link default <pull_secret_name> --for=pull
7.15.5.2.3. Creating and using a VDDK image
You can download the VMware Virtual Disk Development Kit (VDDK), build a VDDK image, and push the VDDK image to your image registry. You then add the VDDK image to the v2v-vmware
config map.
Prerequisites
- You must have access to an OpenShift Container Platform internal image registry or a secure external registry.
Procedure
Create and navigate to a temporary directory:
$ mkdir /tmp/<dir_name> && cd /tmp/<dir_name>
- In a browser, navigate to VMware code and click SDKs.
- Under Compute Virtualization, click Virtual Disk Development Kit (VDDK).
- Select the VDDK version that corresponds to your VMware vSphere version, for example, VDDK 7.0 for vSphere 7.0, click Download, and then save the VDDK archive in the temporary directory.
Extract the VDDK archive:
$ tar -xzf VMware-vix-disklib-<version>.x86_64.tar.gz
Create a
Dockerfile
:$ cat > Dockerfile <<EOF FROM busybox:latest COPY vmware-vix-disklib-distrib /vmware-vix-disklib-distrib RUN mkdir -p /opt ENTRYPOINT ["cp", "-r", "/vmware-vix-disklib-distrib", "/opt"] EOF
Build the image:
$ podman build . -t <registry_route_or_server_path>/vddk:<tag> 1
- 1
- Specify your image registry:
-
For an internal OpenShift Container Platform registry, use the internal registry route, for example,
image-registry.openshift-image-registry.svc:5000/openshift/vddk:<tag>
. -
For an external registry, specify the server name, path, and tag, for example,
server.example.com:5000/vddk:<tag>
.
-
For an internal OpenShift Container Platform registry, use the internal registry route, for example,
Push the image to the registry:
$ podman push <registry_route_or_server_path>/vddk:<tag>
- Ensure that the image is accessible to your OpenShift Virtualization environment.
Edit the
v2v-vmware
config map in the openshift-cnv project:$ oc edit configmap v2v-vmware -n openshift-cnv
Add the
vddk-init-image
parameter to thedata
stanza:... data: vddk-init-image: <registry_route_or_server_path>/vddk:<tag>
7.15.5.3. Importing a virtual machine with the VM Import wizard
You can import a single virtual machine with the VM Import wizard.
You can also import a VM template. If you import a VM template, OpenShift Virtualization creates a virtual machine based on the template.
Prerequisites
- You must have admin user privileges.
- The VMware Virtual Disk Development Kit (VDDK) image must be in an image registry that is accessible to your OpenShift Virtualization environment.
-
The VDDK image must be added to the
v2v-vmware
config map. - The VM must be powered off.
- Virtual disks must be connected to IDE or SCSI controllers. If virtual disks are connected to a SATA controller, you can change them to IDE controllers and then migrate the VM.
- The OpenShift Virtualization local and shared persistent storage classes must support VM import.
The OpenShift Virtualization storage must be large enough to accommodate the virtual disk.
WarningIf you are using Ceph RBD block-mode volumes, the storage must be large enough to accommodate the virtual disk. If the disk is too large for the available storage, the import process fails and the PV that is used to copy the virtual disk is not released. You will not be able to import another virtual machine or to clean up the storage because there are insufficient resources to support object deletion. To resolve this situation, you must add more object storage devices to the storage back end.
The OpenShift Virtualization egress network policy must allow the following traffic:
Destination Protocol Port VMware ESXi hosts
TCP
443
VMware ESXi hosts
TCP
902
VMware vCenter
TCP
5840
Procedure
- In the web console, click Workloads → Virtual Machines.
- Click Create Virtual Machine and select Import with Wizard.
- Select VMware from the Provider list.
Select Connect to New Instance or a saved vCenter instance.
- If you select Connect to New Instance, enter the vCenter hostname, Username, and Password.
- If you select a saved vCenter instance, the wizard connects to the vCenter instance using the saved credentials.
Click Check and Save and wait for the connection to complete.
NoteThe connection details are stored in a secret. If you add a provider with an incorrect hostname, user name, or password, click Workloads → Secrets and delete the provider secret.
- Select a virtual machine or a template.
- Click Next.
- In the Review screen, review your settings.
Click Edit to update the following settings:
General:
- Description
- Operating System
- Flavor
- Memory
- CPUs
- Workload Profile
Networking:
- Name
- Model
- Network
- Type
- MAC Address
Storage: Click the Options menu of the VM disk and select Edit to update the following fields:
- Name
- Source: For example, Import Disk.
- Size
- Interface
Storage Class: Select NFS or ocs-storagecluster-ceph-rbd (ceph-rbd).
If you select ocs-storagecluster-ceph-rbd, you must set the Volume Mode of the disk to Block.
Other storage classes might work, but they are not officially supported.
- Advanced → Volume Mode: Select Block.
- Advanced → Access Mode
Advanced → Cloud-init:
- Form: Enter the Hostname and Authenticated SSH Keys.
-
Custom script: Enter the
cloud-init
script in the text field.
- Advanced → Virtual Hardware: You can attach a virtual CD-ROM to the imported virtual machine.
Click Import or Review and Import, if you have edited the import settings.
A Successfully created virtual machine message and a list of resources created for the virtual machine are displayed. The virtual machine appears in Workloads → Virtual Machines.
Virtual machine wizard fields
Name | Parameter | Description |
---|---|---|
Name |
The name can contain lowercase letters ( | |
Description | Optional description field. | |
Operating System | The primary operating system that is selected for the virtual machine in the template. You cannot edit this field when creating a virtual machine from a template. | |
Boot Source | Import via URL (creates PVC) | Import content from an image available from an HTTP or HTTPS endpoint. Example: Obtaining a URL link from the web page with the operating system image. |
Clone existing PVC (creates PVC) | Select an existent persistent volume claim available on the cluster and clone it. | |
Import via Registry (creates PVC) |
Provision virtual machine from a bootable operating system container located in a registry accessible from the cluster. Example: | |
PXE (network boot - adds network interface) | Boot an operating system from a server on the network. Requires a PXE bootable network attachment definition. | |
Persistent Volume Claim project | Project name that you want to use for cloning the PVC. | |
Persistent Volume Claim name | PVC name that should apply to this virtual machine template if you are cloning an existing PVC. | |
Mount this as a CD-ROM boot source | A CD-ROM requires an additional disk for installing the operating system. Select the checkbox to add a disk and customize it later. | |
Flavor | Tiny, Small, Medium, Large, Custom | Presets that determine the amount of CPU and memory allocated to the virtual machine. The presets displayed for Flavor are determined by the operating system. |
Workload Type | Desktop | A virtual machine configuration for use on a desktop. Ideal for consumption on a small scale. Recommended for use with the web console. |
Server | Balances performance and it is compatible with a wide range of server workloads. | |
High-Performance | A virtual machine configuration that is optimized for high-performance workloads. | |
Start this virtual machine after creation. | This checkbox is selected by default and the virtual machine starts running after creation. Clear the checkbox if you do not want the virtual machine to start when it is created. |
Cloud-init fields
Name | Description |
---|---|
Hostname | Sets a specific hostname for the virtual machine. |
Authorized SSH Keys | The user’s public key that is copied to ~/.ssh/authorized_keys on the virtual machine. |
Custom script | Replaces other options with a field in which you paste a custom cloud-init script. |
Networking fields
Name | Description |
---|---|
Name | Name for the network interface controller. |
Model | Indicates the model of the network interface controller. Supported values are e1000e and virtio. |
Network | List of available network attachment definitions. |
Type |
List of available binding methods. For the default pod network, |
MAC Address | MAC address for the network interface controller. If a MAC address is not specified, one is assigned automatically. |
Storage fields
Name | Selection | Description |
---|---|---|
Source | Blank (creates PVC) | Create an empty disk. |
Import via URL (creates PVC) | Import content via URL (HTTP or HTTPS endpoint). | |
Use an existing PVC | Use a PVC that is already available in the cluster. | |
Clone existing PVC (creates PVC) | Select an existing PVC available in the cluster and clone it. | |
Import via Registry (creates PVC) | Import content via container registry. | |
Container (ephemeral) | Upload content from a container located in a registry accessible from the cluster. The container disk should be used only for read-only filesystems such as CD-ROMs or temporary virtual machines. | |
Name |
Name of the disk. The name can contain lowercase letters ( | |
Size | Size of the disk in GiB. | |
Type | Type of disk. Example: Disk or CD-ROM | |
Interface | Type of disk device. Supported interfaces are virtIO, SATA, and SCSI. | |
Storage Class | The storage class that is used to create the disk. | |
Advanced → Volume Mode | Defines whether the persistent volume uses a formatted file system or raw block state. Default is Filesystem. | |
Advanced → Access Mode | Access mode of the persistent volume. Supported access modes are Single User (RWO), Shared Access (RWX), and Read Only (ROX). |
Advanced storage settings
The following advanced storage settings are available for Blank, Import via URL, and Clone existing PVC disks. These parameters are optional. If you do not specify these parameters, the system uses the default values from the kubevirt-storage-class-defaults
config map.
Name | Parameter | Description |
---|---|---|
Volume Mode | Filesystem | Stores the virtual disk on a file system-based volume. |
Block |
Stores the virtual disk directly on the block volume. Only use | |
Access Mode | Single User (RWO) | The disk can be mounted as read/write by a single node. |
Shared Access (RWX) | The disk can be mounted as read/write by many nodes. Note This is required for some features, such as live migration of virtual machines between nodes. | |
Read Only (ROX) | The disk can be mounted as read-only by many nodes. |
7.15.5.3.1. Updating the NIC name of an imported virtual machine
You must update the NIC name of a virtual machine that you imported from VMware to conform to OpenShift Virtualization naming conventions.
Procedure
- Log in to the virtual machine.
-
Navigate to the
/etc/sysconfig/network-scripts
directory. Rename the network configuration file:
$ mv vmnic0 ifcfg-eth0 1
- 1
- The first network configuration file is named
ifcfg-eth0
. Additional network configuration files are numbered sequentially, for example,ifcfg-eth1
,ifcfg-eth2
.
Update the
NAME
andDEVICE
parameters in the network configuration file:NAME=eth0 DEVICE=eth0
Restart the network:
$ systemctl restart network
7.15.5.4. Troubleshooting a virtual machine import
7.15.5.4.1. Logs
You can check the V2V Conversion pod log for errors.
Procedure
View the V2V Conversion pod name by running the following command:
$ oc get pods -n <namespace> | grep v2v 1
- 1
- Specify the namespace of your imported virtual machine.
Example output
kubevirt-v2v-conversion-f66f7d-zqkz7 1/1 Running 0 4h49m
View the V2V Conversion pod log by running the following command:
$ oc logs <kubevirt-v2v-conversion-f66f7d-zqkz7> -f -n <namespace> 1
- 1
- Specify the VM Conversion pod name and the namespace.
7.15.5.4.2. Error messages
The following error messages might appear:
If the VMware VM is not shut down before import, the imported virtual machine displays the error message,
Readiness probe failed
in the OpenShift Container Platform console and the V2V Conversion pod log displays the following error message:INFO - have error: ('virt-v2v error: internal error: invalid argument: libvirt domain ‘v2v_migration_vm_1’ is running or paused. It must be shut down in order to perform virt-v2v conversion',)"
The following error message is displayed in the OpenShift Container Platform console if a non-admin user tries to import a VM:
Could not load config map vmware-to-kubevirt-os in kube-public namespace Restricted Access: configmaps "vmware-to-kubevirt-os" is forbidden: User cannot get resource "configmaps" in API group "" in the namespace "kube-public"
Only an admin user can import a VM.
7.16. Cloning virtual machines
7.16.1. Enabling user permissions to clone data volumes across namespaces
The isolating nature of namespaces means that users cannot by default clone resources between namespaces.
To enable a user to clone a virtual machine to another namespace, a user with the cluster-admin
role must create a new cluster role. Bind this cluster role to a user to enable them to clone virtual machines to the destination namespace.
7.16.1.1. Prerequisites
-
Only a user with the
cluster-admin
role can create cluster roles.
7.16.1.2. About data volumes
DataVolume
objects are custom resources that are provided by the Containerized Data Importer (CDI) project. Data volumes orchestrate import, clone, and upload operations that are associated with an underlying persistent volume claim (PVC). Data volumes are integrated with OpenShift Virtualization, and they prevent a virtual machine from being started before the PVC has been prepared.
7.16.1.3. Creating RBAC resources for cloning data volumes
Create a new cluster role that enables permissions for all actions for the datavolumes
resource.
Procedure
Create a
ClusterRole
manifest:apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRole metadata: name: <datavolume-cloner> 1 rules: - apiGroups: ["cdi.kubevirt.io"] resources: ["datavolumes/source"] verbs: ["*"]
- 1
- Unique name for the cluster role.
Create the cluster role in the cluster:
$ oc create -f <datavolume-cloner.yaml> 1
- 1
- The file name of the
ClusterRole
manifest created in the previous step.
Create a
RoleBinding
manifest that applies to both the source and destination namespaces and references the cluster role created in the previous step.apiVersion: rbac.authorization.k8s.io/v1 kind: RoleBinding metadata: name: <allow-clone-to-user> 1 namespace: <Source namespace> 2 subjects: - kind: ServiceAccount name: default namespace: <Destination namespace> 3 roleRef: kind: ClusterRole name: datavolume-cloner 4 apiGroup: rbac.authorization.k8s.io
Create the role binding in the cluster:
$ oc create -f <datavolume-cloner.yaml> 1
- 1
- The file name of the
RoleBinding
manifest created in the previous step.
7.16.2. Cloning a virtual machine disk into a new data volume
You can clone the persistent volume claim (PVC) of a virtual machine disk into a new data volume by referencing the source PVC in your data volume configuration file.
Cloning operations between different volume modes are not supported. The volumeMode
values must match in both the source and target specifications.
For example, if you attempt to clone from a persistent volume (PV) with volumeMode: Block
to a PV with volumeMode: Filesystem
, the operation fails with an error message.
7.16.2.1. Prerequisites
- Users need additional permissions to clone the PVC of a virtual machine disk into another namespace.
7.16.2.2. About data volumes
DataVolume
objects are custom resources that are provided by the Containerized Data Importer (CDI) project. Data volumes orchestrate import, clone, and upload operations that are associated with an underlying persistent volume claim (PVC). Data volumes are integrated with OpenShift Virtualization, and they prevent a virtual machine from being started before the PVC has been prepared.
7.16.2.3. Cloning the persistent volume claim of a virtual machine disk into a new data volume
You can clone a persistent volume claim (PVC) of an existing virtual machine disk into a new data volume. The new data volume can then be used for a new virtual machine.
When a data volume is created independently of a virtual machine, the lifecycle of the data volume is independent of the virtual machine. If the virtual machine is deleted, neither the data volume nor its associated PVC is deleted.
Prerequisites
- Determine the PVC of an existing virtual machine disk to use. You must power down the virtual machine that is associated with the PVC before you can clone it.
-
Install the OpenShift CLI (
oc
).
Procedure
- Examine the virtual machine disk you want to clone to identify the name and namespace of the associated PVC.
Create a YAML file for a data volume that specifies the name of the new data volume, the name and namespace of the source PVC, and the size of the new data volume.
For example:
apiVersion: cdi.kubevirt.io/v1beta1 kind: DataVolume metadata: name: <cloner-datavolume> 1 spec: source: pvc: namespace: "<source-namespace>" 2 name: "<my-favorite-vm-disk>" 3 pvc: accessModes: - ReadWriteOnce resources: requests: storage: <2Gi> 4
Start cloning the PVC by creating the data volume:
$ oc create -f <cloner-datavolume>.yaml
NoteData volumes prevent a virtual machine from starting before the PVC is prepared, so you can create a virtual machine that references the new data volume while the PVC clones.
7.16.2.4. Template: Data volume clone configuration file
example-clone-dv.yaml
apiVersion: cdi.kubevirt.io/v1beta1 kind: DataVolume metadata: name: "example-clone-dv" spec: source: pvc: name: source-pvc namespace: example-ns pvc: accessModes: - ReadWriteOnce resources: requests: storage: "1G"
7.16.2.5. CDI supported operations matrix
This matrix shows the supported CDI operations for content types against endpoints, and which of these operations requires scratch space.
Content types | HTTP | HTTPS | HTTP basic auth | Registry | Upload |
---|---|---|---|---|---|
KubeVirt(QCOW2) |
✓ QCOW2 |
✓ QCOW2** |
✓ QCOW2 |
✓ QCOW2* |
✓ QCOW2* |
KubeVirt (RAW) |
✓ RAW |
✓ RAW |
✓ RAW |
✓ RAW* |
✓ RAW* |
✓ Supported operation
□ Unsupported operation
* Requires scratch space
** Requires scratch space if a custom certificate authority is required
7.16.3. Cloning a virtual machine by using a data volume template
You can create a new virtual machine by cloning the persistent volume claim (PVC) of an existing VM. By including a dataVolumeTemplate
in your virtual machine configuration file, you create a new data volume from the original PVC.
Cloning operations between different volume modes are not supported. The volumeMode
values must match in both the source and target specifications.
For example, if you attempt to clone from a persistent volume (PV) with volumeMode: Block
to a PV with volumeMode: Filesystem
, the operation fails with an error message.
7.16.3.1. Prerequisites
- Users need additional permissions to clone the PVC of a virtual machine disk into another namespace.
7.16.3.2. About data volumes
DataVolume
objects are custom resources that are provided by the Containerized Data Importer (CDI) project. Data volumes orchestrate import, clone, and upload operations that are associated with an underlying persistent volume claim (PVC). Data volumes are integrated with OpenShift Virtualization, and they prevent a virtual machine from being started before the PVC has been prepared.
7.16.3.3. Creating a new virtual machine from a cloned persistent volume claim by using a data volume template
You can create a virtual machine that clones the persistent volume claim (PVC) of an existing virtual machine into a data volume. Reference a dataVolumeTemplate
in the virtual machine manifest and the source
PVC is cloned to a data volume, which is then automatically used for the creation of the virtual machine.
When a data volume is created as part of the data volume template of a virtual machine, the lifecycle of the data volume is then dependent on the virtual machine. If the virtual machine is deleted, the data volume and associated PVC are also deleted.
Prerequisites
- Determine the PVC of an existing virtual machine disk to use. You must power down the virtual machine that is associated with the PVC before you can clone it.
-
Install the OpenShift CLI (
oc
).
Procedure
- Examine the virtual machine you want to clone to identify the name and namespace of the associated PVC.
Create a YAML file for a
VirtualMachine
object. The following virtual machine example clonesmy-favorite-vm-disk
, which is located in thesource-namespace
namespace. The2Gi
data volume calledfavorite-clone
is created frommy-favorite-vm-disk
.For example:
apiVersion: kubevirt.io/v1alpha3 kind: VirtualMachine metadata: labels: kubevirt.io/vm: vm-dv-clone name: vm-dv-clone 1 spec: running: false template: metadata: labels: kubevirt.io/vm: vm-dv-clone spec: domain: devices: disks: - disk: bus: virtio name: root-disk resources: requests: memory: 64M volumes: - dataVolume: name: favorite-clone name: root-disk dataVolumeTemplates: - metadata: name: favorite-clone spec: pvc: accessModes: - ReadWriteOnce resources: requests: storage: 2Gi source: pvc: namespace: "source-namespace" name: "my-favorite-vm-disk"
- 1
- The virtual machine to create.
Create the virtual machine with the PVC-cloned data volume:
$ oc create -f <vm-clone-datavolumetemplate>.yaml
7.16.3.4. Template: Data volume virtual machine configuration file
example-dv-vm.yaml
apiVersion: kubevirt.io/v1alpha3
kind: VirtualMachine
metadata:
labels:
kubevirt.io/vm: example-vm
name: example-vm
spec:
dataVolumeTemplates:
- metadata:
name: example-dv
spec:
pvc:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1G
source:
http:
url: "" 1
running: false
template:
metadata:
labels:
kubevirt.io/vm: example-vm
spec:
domain:
cpu:
cores: 1
devices:
disks:
- disk:
bus: virtio
name: example-dv-disk
machine:
type: q35
resources:
requests:
memory: 1G
terminationGracePeriodSeconds: 0
volumes:
- dataVolume:
name: example-dv
name: example-dv-disk
- 1
- The
HTTP
source of the image you want to import, if applicable.
7.16.3.5. CDI supported operations matrix
This matrix shows the supported CDI operations for content types against endpoints, and which of these operations requires scratch space.
Content types | HTTP | HTTPS | HTTP basic auth | Registry | Upload |
---|---|---|---|---|---|
KubeVirt(QCOW2) |
✓ QCOW2 |
✓ QCOW2** |
✓ QCOW2 |
✓ QCOW2* |
✓ QCOW2* |
KubeVirt (RAW) |
✓ RAW |
✓ RAW |
✓ RAW |
✓ RAW* |
✓ RAW* |
✓ Supported operation
□ Unsupported operation
* Requires scratch space
** Requires scratch space if a custom certificate authority is required
7.16.4. Cloning a virtual machine disk into a new block storage data volume
You can clone the persistent volume claim (PVC) of a virtual machine disk into a new block data volume by referencing the source PVC in your data volume configuration file.
Cloning operations between different volume modes are not supported. The volumeMode
values must match in both the source and target specifications.
For example, if you attempt to clone from a persistent volume (PV) with volumeMode: Block
to a PV with volumeMode: Filesystem
, the operation fails with an error message.
7.16.4.1. Prerequisites
- Users need additional permissions to clone the PVC of a virtual machine disk into another namespace.
7.16.4.2. About data volumes
DataVolume
objects are custom resources that are provided by the Containerized Data Importer (CDI) project. Data volumes orchestrate import, clone, and upload operations that are associated with an underlying persistent volume claim (PVC). Data volumes are integrated with OpenShift Virtualization, and they prevent a virtual machine from being started before the PVC has been prepared.
7.16.4.3. About block persistent volumes
A block persistent volume (PV) is a PV that is backed by a raw block device. These volumes do not have a file system and can provide performance benefits for virtual machines by reducing overhead.
Raw block volumes are provisioned by specifying volumeMode: Block
in the PV and persistent volume claim (PVC) specification.
7.16.4.4. Creating a local block persistent volume
Create a local block persistent volume (PV) on a node by populating a file and mounting it as a loop device. You can then reference this loop device in a PV manifest as a Block
volume and use it as a block device for a virtual machine image.
Procedure
-
Log in as
root
to the node on which to create the local PV. This procedure usesnode01
for its examples. Create a file and populate it with null characters so that it can be used as a block device. The following example creates a file
loop10
with a size of 2Gb (20 100Mb blocks):$ dd if=/dev/zero of=<loop10> bs=100M count=20
Mount the
loop10
file as a loop device.$ losetup </dev/loop10>d3 <loop10> 1 2
Create a
PersistentVolume
manifest that references the mounted loop device.kind: PersistentVolume apiVersion: v1 metadata: name: <local-block-pv10> annotations: spec: local: path: </dev/loop10> 1 capacity: storage: <2Gi> volumeMode: Block 2 storageClassName: local 3 accessModes: - ReadWriteOnce persistentVolumeReclaimPolicy: Delete nodeAffinity: required: nodeSelectorTerms: - matchExpressions: - key: kubernetes.io/hostname operator: In values: - <node01> 4
Create the block PV.
# oc create -f <local-block-pv10.yaml>1
- 1
- The file name of the persistent volume created in the previous step.
7.16.4.5. Cloning the persistent volume claim of a virtual machine disk into a new data volume
You can clone a persistent volume claim (PVC) of an existing virtual machine disk into a new data volume. The new data volume can then be used for a new virtual machine.
When a data volume is created independently of a virtual machine, the lifecycle of the data volume is independent of the virtual machine. If the virtual machine is deleted, neither the data volume nor its associated PVC is deleted.
Prerequisites
- Determine the PVC of an existing virtual machine disk to use. You must power down the virtual machine that is associated with the PVC before you can clone it.
-
Install the OpenShift CLI (
oc
). - At least one available block persistent volume (PV) that is the same size as or larger than the source PVC.
Procedure
- Examine the virtual machine disk you want to clone to identify the name and namespace of the associated PVC.
Create a YAML file for a data volume that specifies the name of the new data volume, the name and namespace of the source PVC,
volumeMode: Block
so that an available block PV is used, and the size of the new data volume.For example:
apiVersion: cdi.kubevirt.io/v1beta1 kind: DataVolume metadata: name: <cloner-datavolume> 1 spec: source: pvc: namespace: "<source-namespace>" 2 name: "<my-favorite-vm-disk>" 3 pvc: accessModes: - ReadWriteOnce resources: requests: storage: <2Gi> 4 volumeMode: Block 5
- 1
- The name of the new data volume.
- 2
- The namespace where the source PVC exists.
- 3
- The name of the source PVC.
- 4
- The size of the new data volume. You must allocate enough space, or the cloning operation fails. The size must be the same as or larger than the source PVC.
- 5
- Specifies that the destination is a block PV
Start cloning the PVC by creating the data volume:
$ oc create -f <cloner-datavolume>.yaml
NoteData volumes prevent a virtual machine from starting before the PVC is prepared, so you can create a virtual machine that references the new data volume while the PVC clones.
7.16.4.6. CDI supported operations matrix
This matrix shows the supported CDI operations for content types against endpoints, and which of these operations requires scratch space.
Content types | HTTP | HTTPS | HTTP basic auth | Registry | Upload |
---|---|---|---|---|---|
KubeVirt(QCOW2) |
✓ QCOW2 |
✓ QCOW2** |
✓ QCOW2 |
✓ QCOW2* |
✓ QCOW2* |
KubeVirt (RAW) |
✓ RAW |
✓ RAW |
✓ RAW |
✓ RAW* |
✓ RAW* |
✓ Supported operation
□ Unsupported operation
* Requires scratch space
** Requires scratch space if a custom certificate authority is required
7.17. Virtual machine networking
7.17.1. Configuring the virtual machine for the default pod network
You can connect a virtual machine to the default internal pod network by configuring its network interface to use the masquerade
binding mode.
The KubeMacPool component provides a MAC address pool service for virtual machine NICs in designated namespaces. It is not enabled by default. Enable a MAC address pool in a namespace by applying the KubeMacPool label to that namespace.
7.17.1.1. Configuring masquerade mode from the command line
You can use masquerade mode to hide a virtual machine’s outgoing traffic behind the pod IP address. Masquerade mode uses Network Address Translation (NAT) to connect virtual machines to the pod network backend through a Linux bridge.
Enable masquerade mode and allow traffic to enter the virtual machine by editing your virtual machine configuration file.
Prerequisites
- The virtual machine must be configured to use DHCP to acquire IPv4 addresses. The examples below are configured to use DHCP.
Procedure
Edit the
interfaces
spec of your virtual machine configuration file:kind: VirtualMachine spec: domain: devices: interfaces: - name: default masquerade: {} 1 ports: - port: 80 2 networks: - name: default pod: {}
- 1
- Connect using masquerade mode.
- 2
- Optional: List the ports that you want to expose from the virtual machine, each specified by the
port
field. Theport
value must be a number between 0 and 65536. When theports
array is not used, all ports in the valid range are open to incoming traffic. In this example, incoming traffic is allowed on port80
.
NotePorts 49152 and 49153 are reserved for use by the libvirt platform and all other incoming traffic to these ports is dropped.
Create the virtual machine:
$ oc create -f <vm-name>.yaml
7.17.1.2. Creating a service from a virtual machine
Create a service from a running virtual machine by first creating a Service
object to expose the virtual machine.
The ClusterIP
service type exposes the virtual machine internally, within the cluster. The NodePort
or LoadBalancer
service types expose the virtual machine externally, outside of the cluster.
This procedure presents an example of how to create, connect to, and expose a Service
object of type: ClusterIP
as a virtual machine-backed service.
ClusterIP
is the default service type
, if the service type
is not specified.
Procedure
Edit the virtual machine YAML as follows:
apiVersion: kubevirt.io/v1alpha3 kind: VirtualMachine metadata: name: vm-ephemeral namespace: example-namespace spec: running: false template: metadata: labels: special: key 1 spec: domain: devices: disks: - name: containerdisk disk: bus: virtio - name: cloudinitdisk disk: bus: virtio interfaces: - masquerade: {} name: default resources: requests: memory: 1024M networks: - name: default pod: {} volumes: - name: containerdisk containerDisk: image: kubevirt/fedora-cloud-container-disk-demo - name: cloudinitdisk cloudInitNoCloud: userData: | #!/bin/bash echo "fedora" | passwd fedora --stdin
- 1
- Add the label
special: key
in thespec.template.metadata.labels
section.
NoteLabels on a virtual machine are passed through to the pod. The labels on the
VirtualMachine
configuration, for examplespecial: key
, must match the labels in theService
YAMLselector
attribute, which you create later in this procedure.- Save the virtual machine YAML to apply your changes.
Edit the
Service
YAML to configure the settings necessary to create and expose theService
object:apiVersion: v1 kind: Service metadata: name: vmservice 1 namespace: example-namespace 2 spec: ports: - port: 27017 protocol: TCP targetPort: 22 3 selector: special: key 4 type: ClusterIP 5
- 1
- Specify the
name
of the service you are creating and exposing. - 2
- Specify
namespace
in themetadata
section of theService
YAML that corresponds to thenamespace
you specify in the virtual machine YAML. - 3
- Add
targetPort: 22
, exposing the service on SSH port22
. - 4
- In the
spec
section of theService
YAML, addspecial: key
to theselector
attribute, which corresponds to thelabels
you added in the virtual machine YAML configuration file. - 5
- In the
spec
section of theService
YAML, addtype: ClusterIP
for a ClusterIP service. To create and expose other types of services externally, outside of the cluster, such asNodePort
andLoadBalancer
, replacetype: ClusterIP
withtype: NodePort
ortype: LoadBalancer
, as appropriate.
-
Save the
Service
YAML to store the service configuration. Create the
ClusterIP
service:$ oc create -f <service_name>.yaml
- Start the virtual machine. If the virtual machine is already running, restart it.
Query the
Service
object to verify it is available and is configured with typeClusterIP
.Verification
Run the
oc get service
command, specifying thenamespace
that you reference in the virtual machine andService
YAML files.$ oc get service -n example-namespace
Example output
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE vmservice ClusterIP 172.30.3.149 <none> 27017/TCP 2m
-
As shown from the output,
vmservice
is running. -
The
TYPE
displays asClusterIP
, as you specified in theService
YAML.
-
As shown from the output,
Establish a connection to the virtual machine that you want to use to back your service. Connect from an object inside the cluster, such as another virtual machine.
Edit the virtual machine YAML as follows:
apiVersion: kubevirt.io/v1alpha3 kind: VirtualMachine metadata: name: vm-connect namespace: example-namespace spec: running: false template: spec: domain: devices: disks: - name: containerdisk disk: bus: virtio - name: cloudinitdisk disk: bus: virtio interfaces: - masquerade: {} name: default resources: requests: memory: 1024M networks: - name: default pod: {} volumes: - name: containerdisk containerDisk: image: kubevirt/fedora-cloud-container-disk-demo - name: cloudinitdisk cloudInitNoCloud: userData: | #!/bin/bash echo "fedora" | passwd fedora --stdin
Run the
oc create
command to create a second virtual machine, wherefile.yaml
is the name of the virtual machine YAML:$ oc create -f <file.yaml>
- Start the virtual machine.
Connect to the virtual machine by running the following
virtctl
command:$ virtctl -n example-namespace console <new-vm-name>
NoteFor service type
LoadBalancer
, use thevinagre
client to connect your virtual machine by using the public IP and port. External ports are dynamically allocated when using service typeLoadBalancer
.Run the
ssh
command to authenticate the connection, where172.30.3.149
is the ClusterIP of the service andfedora
is the user name of the virtual machine:$ ssh fedora@172.30.3.149 -p 27017
Verification
- You receive the command prompt of the virtual machine backing the service you want to expose. You now have a service backed by a running virtual machine.
7.17.2. Attaching a virtual machine to a Linux bridge network
By default, OpenShift Virtualization is installed with a single, internal pod network.
You must create a Linux bridge network attachment definition (NAD) in order to connect to additional networks.
To attach a virtual machine to an additional network:
- Create a Linux bridge node network configuration policy.
- Create a Linux bridge network attachment definition.
- Configure the virtual machine, enabling the virtual machine to recognize the network attachment definition.
For more information about scheduling, interface types, and other node networking activities, see the node networking section.
7.17.2.1. Connecting to the network through the network attachment definition
7.17.2.1.1. Creating a Linux bridge node network configuration policy
Use a NodeNetworkConfigurationPolicy
manifest YAML file to create the Linux bridge.
Procedure
Create the
NodeNetworkConfigurationPolicy
manifest. This example includes sample values that you must replace with your own information.apiVersion: nmstate.io/v1 kind: NodeNetworkConfigurationPolicy metadata: name: br1-eth1-policy 1 spec: desiredState: interfaces: - name: br1 2 description: Linux bridge with eth1 as a port 3 type: linux-bridge 4 state: up 5 ipv4: enabled: false 6 bridge: options: stp: enabled: false 7 port: - name: eth1 8
- 1
- Name of the policy.
- 2
- Name of the interface.
- 3
- Optional: Human-readable description of the interface.
- 4
- The type of interface. This example creates a bridge.
- 5
- The requested state for the interface after creation.
- 6
- Disables IPv4 in this example.
- 7
- Disables STP in this example.
- 8
- The node NIC to which the bridge is attached.
7.17.2.2. Creating a Linux bridge network attachment definition
7.17.2.2.1. Prerequisites
- A Linux bridge must be configured and attached on every node. See the node networking section for more information.
Configuring IP address management (IPAM) in a network attachment definition for virtual machines is not supported.
7.17.2.2.2. Creating a Linux bridge network attachment definition in the web console
The network attachment definition is a custom resource that exposes layer-2 devices to a specific namespace in your OpenShift Virtualization cluster.
Network administrators can create network attachment definitions to provide existing layer-2 networking to pods and virtual machines.
Procedure
- In the web console, click Networking → Network Attachment Definitions.
Click Create Network Attachment Definition.
NoteThe network attachment definition must be in the same namespace as the pod or virtual machine.
- Enter a unique Name and optional Description.
- Click the Network Type list and select CNV Linux bridge.
- Enter the name of the bridge in the Bridge Name field.
- Optional: If the resource has VLAN IDs configured, enter the ID numbers in the VLAN Tag Number field.
- Optional: Select MAC Spoof Check to enable MAC spoof filtering. This feature provides security against a MAC spoofing attack by allowing only a single MAC address to exit the pod.
Click Create.
NoteA Linux bridge network attachment definition is the most efficient method for connecting a virtual machine to a VLAN.
7.17.2.2.3. Creating a Linux bridge network attachment definition in the CLI
As a network administrator, you can configure a network attachment definition of type cnv-bridge
to provide layer-2 networking to pods and virtual machines.
Prerequisites
-
The node must support nftables and the
nft
binary must be deployed to enable MAC spoof check.
Procedure
- Create a network attachment definition in the same namespace as the virtual machine.
Add the virtual machine to the network attachment definition, as in the following example:
apiVersion: "k8s.cni.cncf.io/v1" kind: NetworkAttachmentDefinition metadata: name: <bridge-network> 1 annotations: k8s.v1.cni.cncf.io/resourceName: bridge.network.kubevirt.io/<bridge-interface> 2 spec: config: '{ "cniVersion": "0.3.1", "name": "<bridge-network>", 3 "type": "cnv-bridge", 4 "bridge": "<bridge-interface>", 5 "macspoofchk": true, 6 "vlan": 1 7 }'
- 1
- The name for the
NetworkAttachmentDefinition
object. - 2
- Optional: Annotation key-value pair for node selection, where
bridge-interface
must match the name of a bridge configured on some nodes. If you add this annotation to your network attachment definition, your virtual machine instances will only run on the nodes that have thebridge-interface
bridge connected. - 3
- The name for the configuration. It is recommended to match the configuration name to the
name
value of the network attachment definition. - 4
- The actual name of the Container Network Interface (CNI) plug-in that provides the network for this network attachment definition. Do not change this field unless you want to use a different CNI.
- 5
- The name of the Linux bridge configured on the node.
- 6
- Optional: Flag to enable MAC spoof check. When set to
true
, you cannot change the MAC address of the pod or guest interface. This attribute provides security against a MAC spoofing attack by allowing only a single MAC address to exit the pod. - 7
- Optional: The VLAN tag. No additional VLAN configuration is required on the node network configuration policy.
NoteA Linux bridge network attachment definition is the most efficient method for connecting a virtual machine to a VLAN.
Create the network attachment definition:
$ oc create -f <network-attachment-definition.yaml> 1
- 1
- Where
<network-attachment-definition.yaml>
is the file name of the network attachment definition manifest.
Verification
Verify that the network attachment definition was created by running the following command:
$ oc get network-attachment-definition <bridge-network>
7.17.2.3. Configuring the virtual machine for a Linux bridge network
7.17.2.3.1. Creating a NIC for a virtual machine in the web console
Create and attach additional NICs to a virtual machine from the web console.
Procedure
- In the correct project in the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
- Click Network Interfaces to display the NICs already attached to the virtual machine.
- Click Add Network Interface to create a new slot in the list.
- Use the Network drop-down list to select the network attachment definition for the additional network.
- Fill in the Name, Model, Type, and MAC Address for the new NIC.
- Click Add to save and attach the NIC to the virtual machine.
7.17.2.3.2. Networking fields
Name | Description |
---|---|
Name | Name for the network interface controller. |
Model | Indicates the model of the network interface controller. Supported values are e1000e and virtio. |
Network | List of available network attachment definitions. |
Type |
List of available binding methods. For the default pod network, |
MAC Address | MAC address for the network interface controller. If a MAC address is not specified, one is assigned automatically. |
7.17.2.3.3. Attaching a virtual machine to an additional network in the CLI
Attach a virtual machine to an additional network by adding a bridge interface and specifying a network attachment definition in the virtual machine configuration.
This procedure uses a YAML file to demonstrate editing the configuration and applying the updated file to the cluster. You can alternatively use the oc edit <object> <name>
command to edit an existing virtual machine.
Prerequisites
- Shut down the virtual machine before editing the configuration. If you edit a running virtual machine, you must restart the virtual machine for the changes to take effect.
Procedure
- Create or edit a configuration of a virtual machine that you want to connect to the bridge network.
Add the bridge interface to the
spec.template.spec.domain.devices.interfaces
list and the network attachment definition to thespec.template.spec.networks
list. This example adds a bridge interface calledbridge-net
that connects to thea-bridge-network
network attachment definition:apiVersion: kubevirt.io/v1alpha3 kind: VirtualMachine metadata: name: <example-vm> spec: template: spec: domain: devices: interfaces: - masquerade: {} name: <default> - bridge: {} name: <bridge-net> 1 ... networks: - name: <default> pod: {} - name: <bridge-net> 2 multus: networkName: <a-bridge-network> 3 ...
- 1
- The name of the bridge interface.
- 2
- The name of the network. This value must match the
name
value of the correspondingspec.template.spec.domain.devices.interfaces
entry. - 3
- The name of the network attachment definition, prefixed by the namespace where it exists. The namespace must be either the
default
namespace or the same namespace where the VM is to be created. In this case,multus
is used. Multus is a cloud network interface (CNI) plug-in that allows multiple CNIs to exist so that a pod or virtual machine can use the interfaces it needs.
Apply the configuration:
$ oc apply -f <example-vm.yaml>
- Optional: If you edited a running virtual machine, you must restart it for the changes to take effect.
7.17.3. Configuring IP addresses for virtual machines
You can configure either dynamically or statically provisioned IP addresses for virtual machines.
Prerequisites
- The virtual machine must connect to an external network.
- You must have a DHCP server available on the additional network to configure a dynamic IP for the virtual machine.
7.17.3.1. Configuring an IP address for a new virtual machine using cloud-init
You can use cloud-init to configure an IP address when you create a virtual machine. The IP address can be dynamically or statically provisioned.
Procedure
Create a virtual machine configuration and include the cloud-init network details in the
spec.volumes.cloudInitNoCloud.networkData
field of the virtual machine configuration:To configure a dynamic IP, specify the interface name and the
dhcp4
boolean:kind: VirtualMachine spec: ... volumes: - cloudInitNoCloud: networkData: | version: 2 ethernets: eth1: 1 dhcp4: true 2
To configure a static IP, specify the interface name and the IP address:
kind: VirtualMachine spec: ... volumes: - cloudInitNoCloud: networkData: | version: 2 ethernets: eth1: 1 addresses: - 10.10.10.14/24 2
7.17.4. Configuring an SR-IOV network device for virtual machines
You can configure a Single Root I/O Virtualization (SR-IOV) device for virtual machines in your cluster. This process is similar but not identical to configuring an SR-IOV device for OpenShift Container Platform.
Live migration is not supported for virtual machines that are attached to an SR-IOV network interface.
7.17.4.1. Prerequisites
- You must have installed the SR-IOV Operator.
- You must have configured the SR-IOV Operator.
7.17.4.2. Automated discovery of SR-IOV network devices
The SR-IOV Network Operator searches your cluster for SR-IOV capable network devices on worker nodes. The Operator creates and updates a SriovNetworkNodeState custom resource (CR) for each worker node that provides a compatible SR-IOV network device.
The CR is assigned the same name as the worker node. The status.interfaces
list provides information about the network devices on a node.
Do not modify a SriovNetworkNodeState
object. The Operator creates and manages these resources automatically.
7.17.4.2.1. Example SriovNetworkNodeState object
The following YAML is an example of a SriovNetworkNodeState
object created by the SR-IOV Network Operator:
An SriovNetworkNodeState object
apiVersion: sriovnetwork.openshift.io/v1 kind: SriovNetworkNodeState metadata: name: node-25 1 namespace: openshift-sriov-network-operator ownerReferences: - apiVersion: sriovnetwork.openshift.io/v1 blockOwnerDeletion: true controller: true kind: SriovNetworkNodePolicy name: default spec: dpConfigVersion: "39824" status: interfaces: 2 - deviceID: "1017" driver: mlx5_core mtu: 1500 name: ens785f0 pciAddress: "0000:18:00.0" totalvfs: 8 vendor: 15b3 - deviceID: "1017" driver: mlx5_core mtu: 1500 name: ens785f1 pciAddress: "0000:18:00.1" totalvfs: 8 vendor: 15b3 - deviceID: 158b driver: i40e mtu: 1500 name: ens817f0 pciAddress: 0000:81:00.0 totalvfs: 64 vendor: "8086" - deviceID: 158b driver: i40e mtu: 1500 name: ens817f1 pciAddress: 0000:81:00.1 totalvfs: 64 vendor: "8086" - deviceID: 158b driver: i40e mtu: 1500 name: ens803f0 pciAddress: 0000:86:00.0 totalvfs: 64 vendor: "8086" syncStatus: Succeeded
7.17.4.3. Configuring SR-IOV network devices
The SR-IOV Network Operator adds the SriovNetworkNodePolicy.sriovnetwork.openshift.io
CustomResourceDefinition to OpenShift Container Platform. You can configure an SR-IOV network device by creating a SriovNetworkNodePolicy custom resource (CR).
When applying the configuration specified in a SriovNetworkNodePolicy
object, the SR-IOV Operator might drain the nodes, and in some cases, reboot nodes.
It might take several minutes for a configuration change to apply.
Prerequisites
-
You installed the OpenShift CLI (
oc
). -
You have access to the cluster as a user with the
cluster-admin
role. - You have installed the SR-IOV Network Operator.
- You have enough available nodes in your cluster to handle the evicted workload from drained nodes.
- You have not selected any control plane nodes for SR-IOV network device configuration.
Procedure
-
Create an
SriovNetworkNodePolicy
object, and then save the YAML in the<name>-sriov-node-network.yaml
file. Replace<name>
with the name for this configuration.
apiVersion: sriovnetwork.openshift.io/v1 kind: SriovNetworkNodePolicy metadata: name: <name> 1 namespace: openshift-sriov-network-operator 2 spec: resourceName: <sriov_resource_name> 3 nodeSelector: feature.node.kubernetes.io/network-sriov.capable: "true" 4 priority: <priority> 5 mtu: <mtu> 6 numVfs: <num> 7 nicSelector: 8 vendor: "<vendor_code>" 9 deviceID: "<device_id>" 10 pfNames: ["<pf_name>", ...] 11 rootDevices: ["<pci_bus_id>", "..."] 12 deviceType: vfio-pci 13 isRdma: false 14
- 1
- Specify a name for the CR object.
- 2
- Specify the namespace where the SR-IOV Operator is installed.
- 3
- Specify the resource name of the SR-IOV device plug-in. You can create multiple
SriovNetworkNodePolicy
objects for a resource name. - 4
- Specify the node selector to select which nodes are configured. Only SR-IOV network devices on selected nodes are configured. The SR-IOV Container Network Interface (CNI) plug-in and device plug-in are deployed only on selected nodes.
- 5
- Optional: Specify an integer value between
0
and99
. A smaller number gets higher priority, so a priority of10
is higher than a priority of99
. The default value is99
. - 6
- Optional: Specify a value for the maximum transmission unit (MTU) of the virtual function. The maximum MTU value can vary for different NIC models.
- 7
- Specify the number of the virtual functions (VF) to create for the SR-IOV physical network device. For an Intel network interface controller (NIC), the number of VFs cannot be larger than the total VFs supported by the device. For a Mellanox NIC, the number of VFs cannot be larger than
128
. - 8
- The
nicSelector
mapping selects the Ethernet device for the Operator to configure. You do not need to specify values for all the parameters. It is recommended to identify the Ethernet adapter with enough precision to minimize the possibility of selecting an Ethernet device unintentionally. If you specifyrootDevices
, you must also specify a value forvendor
,deviceID
, orpfNames
. If you specify bothpfNames
androotDevices
at the same time, ensure that they point to an identical device. - 9
- Optional: Specify the vendor hex code of the SR-IOV network device. The only allowed values are either
8086
or15b3
. - 10
- Optional: Specify the device hex code of SR-IOV network device. The only allowed values are
158b
,1015
,1017
. - 11
- Optional: The parameter accepts an array of one or more physical function (PF) names for the Ethernet device.
- 12
- The parameter accepts an array of one or more PCI bus addresses for the physical function of the Ethernet device. Provide the address in the following format:
0000:02:00.1
. - 13
- The
vfio-pci
driver type is required for virtual functions in OpenShift Virtualization. - 14
- Optional: Specify whether to enable remote direct memory access (RDMA) mode. For a Mellanox card, set
isRdma
tofalse
. The default value isfalse
.NoteIf
isRDMA
flag is set totrue
, you can continue to use the RDMA enabled VF as a normal network device. A device can be used in either mode.-
Optional: Label the SR-IOV capable cluster nodes with
SriovNetworkNodePolicy.Spec.NodeSelector
if they are not already labeled. For more information about labeling nodes, see "Understanding how to update labels on nodes".
-
Optional: Label the SR-IOV capable cluster nodes with
Create the
SriovNetworkNodePolicy
object:$ oc create -f <name>-sriov-node-network.yaml
where
<name>
specifies the name for this configuration.After applying the configuration update, all the pods in
sriov-network-operator
namespace transition to theRunning
status.To verify that the SR-IOV network device is configured, enter the following command. Replace
<node_name>
with the name of a node with the SR-IOV network device that you just configured.$ oc get sriovnetworknodestates -n openshift-sriov-network-operator <node_name> -o jsonpath='{.status.syncStatus}'
7.17.4.4. Next steps
7.17.5. Defining an SR-IOV network
You can create a network attachment for a Single Root I/O Virtualization (SR-IOV) device for virtual machines.
After the network is defined, you can attach virtual machines to the SR-IOV network.
7.17.5.1. Prerequisites
- You must have configured an SR-IOV device for virtual machines.
7.17.5.2. Configuring SR-IOV additional network
You can configure an additional network that uses SR-IOV hardware by creating a SriovNetwork
object. When you create a SriovNetwork
object, the SR-IOV Operator automatically creates a NetworkAttachmentDefinition
object.
Users can then attach virtual machines to the SR-IOV network by specifying the network in the virtual machine configurations.
Do not modify or delete a SriovNetwork
object if it is attached to any pods or virtual machines in the running
state.
Prerequisites
-
Install the OpenShift CLI (
oc
). -
Log in as a user with
cluster-admin
privileges.
Procedure
-
Create the following
SriovNetwork
object, and then save the YAML in the<name>-sriov-network.yaml
file. Replace<name>
with a name for this additional network.
apiVersion: sriovnetwork.openshift.io/v1 kind: SriovNetwork metadata: name: <name> 1 namespace: openshift-sriov-network-operator 2 spec: resourceName: <sriov_resource_name> 3 networkNamespace: <target_namespace> 4 vlan: <vlan> 5 spoofChk: "<spoof_check>" 6 linkState: <link_state> 7 maxTxRate: <max_tx_rate> 8 minTxRate: <min_rx_rate> 9 vlanQoS: <vlan_qos> 10 trust: "<trust_vf>" 11 capabilities: <capabilities> 12
- 1
- Replace
<name>
with a name for the object. The SR-IOV Network Operator creates aNetworkAttachmentDefinition
object with same name. - 2
- Specify the namespace where the SR-IOV Network Operator is installed.
- 3
- Replace
<sriov_resource_name>
with the value for the.spec.resourceName
parameter from theSriovNetworkNodePolicy
object that defines the SR-IOV hardware for this additional network. - 4
- Replace
<target_namespace>
with the target namespace for the SriovNetwork. Only pods or virtual machines in the target namespace can attach to the SriovNetwork. - 5
- Optional: Replace
<vlan>
with a Virtual LAN (VLAN) ID for the additional network. The integer value must be from0
to4095
. The default value is0
. - 6
- Optional: Replace
<spoof_check>
with the spoof check mode of the VF. The allowed values are the strings"on"
and"off"
.ImportantYou must enclose the value you specify in quotes or the CR is rejected by the SR-IOV Network Operator.
- 7
- Optional: Replace
<link_state>
with the link state of virtual function (VF). Allowed value areenable
,disable
andauto
. - 8
- Optional: Replace
<max_tx_rate>
with a maximum transmission rate, in Mbps, for the VF. - 9
- Optional: Replace
<min_tx_rate>
with a minimum transmission rate, in Mbps, for the VF. This value should always be less than or equal to Maximum transmission rate.NoteIntel NICs do not support the
minTxRate
parameter. For more information, see BZ#1772847. - 10
- Optional: Replace
<vlan_qos>
with an IEEE 802.1p priority level for the VF. The default value is0
. - 11
- Optional: Replace
<trust_vf>
with the trust mode of the VF. The allowed values are the strings"on"
and"off"
.ImportantYou must enclose the value you specify in quotes or the CR is rejected by the SR-IOV Network Operator.
- 12
- Optional: Replace
<capabilities>
with the capabilities to configure for this network.
To create the object, enter the following command. Replace
<name>
with a name for this additional network.$ oc create -f <name>-sriov-network.yaml
Optional: To confirm that the
NetworkAttachmentDefinition
object associated with theSriovNetwork
object that you created in the previous step exists, enter the following command. Replace<namespace>
with the namespace you specified in theSriovNetwork
object.$ oc get net-attach-def -n <namespace>
7.17.5.3. Next steps
7.17.6. Attaching a virtual machine to an SR-IOV network
You can attach a virtual machine to use a Single Root I/O Virtualization (SR-IOV) network as a secondary network.
7.17.6.1. Prerequisites
- You must have configured an SR-IOV device for virtual machines.
- You must have defined an SR-IOV network.
7.17.6.2. Attaching a virtual machine to an SR-IOV network
You can attach the virtual machine to the SR-IOV network by including the network details in the virtual machine configuration.
Procedure
Include the SR-IOV network details in the
spec.domain.devices.interfaces
andspec.networks
of the virtual machine configuration:kind: VirtualMachine ... spec: domain: devices: interfaces: - name: <default> 1 masquerade: {} 2 - name: <nic1> 3 sriov: {} networks: - name: <default> 4 pod: {} - name: <nic1> 5 multus: networkName: <sriov-network> 6 ...
- 1
- A unique name for the interface that is connected to the pod network.
- 2
- The
masquerade
binding to the default pod network. - 3
- A unique name for the SR-IOV interface.
- 4
- The name of the pod network interface. This must be the same as the
interfaces.name
that you defined earlier. - 5
- The name of the SR-IOV interface. This must be the same as the
interfaces.name
that you defined earlier. - 6
- The name of the SR-IOV network attachment definition.
Apply the virtual machine configuration:
$ oc apply -f <vm-sriov.yaml> 1
- 1
- The name of the virtual machine YAML file.
7.17.7. Viewing the IP address of NICs on a virtual machine
You can view the IP address for a network interface controller (NIC) by using the web console or the oc
client. The QEMU guest agent displays additional information about the virtual machine’s secondary networks.
7.17.7.1. Viewing the IP address of a virtual machine interface in the CLI
The network interface configuration is included in the oc describe vmi <vmi_name>
command.
You can also view the IP address information by running ip addr
on the virtual machine, or by running oc get vmi <vmi_name> -o yaml
.
Procedure
Use the
oc describe
command to display the virtual machine interface configuration:$ oc describe vmi <vmi_name>
Example output
... Interfaces: Interface Name: eth0 Ip Address: 10.244.0.37/24 Ip Addresses: 10.244.0.37/24 fe80::858:aff:fef4:25/64 Mac: 0a:58:0a:f4:00:25 Name: default Interface Name: v2 Ip Address: 1.1.1.7/24 Ip Addresses: 1.1.1.7/24 fe80::f4d9:70ff:fe13:9089/64 Mac: f6:d9:70:13:90:89 Interface Name: v1 Ip Address: 1.1.1.1/24 Ip Addresses: 1.1.1.1/24 1.1.1.2/24 1.1.1.4/24 2001:de7:0:f101::1/64 2001:db8:0:f101::1/64 fe80::1420:84ff:fe10:17aa/64 Mac: 16:20:84:10:17:aa
7.17.7.2. Viewing the IP address of a virtual machine interface in the web console
The IP information displays in the Virtual Machine Overview screen for the virtual machine.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine name to open the Virtual Machine Overview screen.
The information for each attached NIC is displayed under IP Address.
7.17.8. Using a MAC address pool for virtual machines
The KubeMacPool component provides a MAC address pool service for virtual machine NICs in designated namespaces. Enable a MAC address pool in a namespace by applying the KubeMacPool label to that namespace.
7.17.8.1. About KubeMacPool
If you enable the KubeMacPool component for a namespace, virtual machine NICs in that namespace are allocated MAC addresses from a MAC address pool. This ensures that the NIC is assigned a unique MAC address that does not conflict with the MAC address of another virtual machine.
Virtual machine instances created from that virtual machine retain the assigned MAC address across reboots.
KubeMacPool does not handle virtual machine instances created independently from a virtual machine.
KubeMacPool is disabled by default. Enable a MAC address pool for a namespace by applying the KubeMacPool label to the namespace.
7.17.8.2. Enabling a MAC address pool for a namespace in the CLI
Enable a MAC address pool for virtual machines in a namespace by applying the mutatevirtualmachines.kubemacpool.io=allocate
label to the namespace.
Procedure
Add the KubeMacPool label to the namespace. The following example adds the KubeMacPool label to two namespaces,
<namespace1>
and<namespace2>
:$ oc label namespace <namespace1> <namespace2> mutatevirtualmachines.kubemacpool.io=allocate
7.17.8.3. Disabling a MAC address pool for a namespace in the CLI
Disable a MAC address pool for virtual machines in a namespace by removing the mutatevirtualmachines.kubemacpool.io
label.
Procedure
Remove the KubeMacPool label from the namespace. The following example removes the KubeMacPool label from two namespaces,
<namespace1>
and<namespace2>
:$ oc label namespace <namespace1> <namespace2> mutatevirtualmachines.kubemacpool.io-
7.18. Virtual machine disks
7.18.1. Storage features
Use the following table to determine feature availability for local and shared persistent storage in OpenShift Virtualization.
7.18.1.1. OpenShift Virtualization storage feature matrix
Virtual machine live migration | Host-assisted virtual machine disk cloning | Storage-assisted virtual machine disk cloning | Virtual machine snapshots | |
---|---|---|---|---|
OpenShift Container Storage: RBD block-mode volumes | Yes | Yes | Yes | Yes |
OpenShift Virtualization hostpath provisioner | No | Yes | No | No |
Other multi-node writable storage | Yes [1] | Yes | Yes [2] | Yes [2] |
Other single-node writable storage | No | Yes | Yes [2] | Yes [2] |
- PVCs must request a ReadWriteMany access mode.
- Storage provider must support both Kubernetes and CSI snapshot APIs
You cannot live migrate virtual machines that use:
- A storage class with ReadWriteOnce (RWO) access mode
- Passthrough features such as SR-IOV and GPU
Do not set the evictionStrategy
field to LiveMigrate
for these virtual machines.
7.18.2. Configuring local storage for virtual machines
You can configure local storage for your virtual machines by using the hostpath provisioner feature.
7.18.2.1. About the hostpath provisioner
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.
When you install the OpenShift Virtualization Operator, the hostpath provisioner Operator is automatically installed. To use it, you must:
Configure SELinux:
-
If you use Red Hat Enterprise Linux CoreOS (RHCOS) 8 workers, you must create a
MachineConfig
object on each node. -
Otherwise, apply the SELinux label
container_file_t
to the persistent volume (PV) backing directory on each node.
-
If you use Red Hat Enterprise Linux CoreOS (RHCOS) 8 workers, you must create a
-
Create a
HostPathProvisioner
custom resource. -
Create a
StorageClass
object for the hostpath provisioner.
The hostpath provisioner Operator deploys the provisioner as a DaemonSet on each node when you create its custom resource. In the custom resource file, you specify the backing directory for the persistent volumes that the hostpath provisioner creates.
7.18.2.2. Configuring SELinux for the hostpath provisioner on Red Hat Enterprise Linux CoreOS (RHCOS) 8
You must configure SELinux before you create the HostPathProvisioner
custom resource. To configure SELinux on Red Hat Enterprise Linux CoreOS (RHCOS) 8 workers, you must create a MachineConfig
object on each node.
Prerequisites
Create a backing directory on each node for the persistent volumes (PVs) that the hostpath provisioner creates.
ImportantThe backing directory must not be located in the filesystem’s root directory because the
/
partition is read-only on RHCOS. For example, you can use/var/<directory_name>
but not/<directory_name>
.
Procedure
Create the
MachineConfig
file. For example:$ touch machineconfig.yaml
Edit the file, ensuring that you include the directory where you want the hostpath provisioner to create PVs. For example:
apiVersion: machineconfiguration.openshift.io/v1 kind: MachineConfig metadata: name: 50-set-selinux-for-hostpath-provisioner labels: machineconfiguration.openshift.io/role: worker spec: config: ignition: version: 3.2.0 systemd: units: - contents: | [Unit] Description=Set SELinux chcon for hostpath provisioner Before=kubelet.service [Service] ExecStart=/usr/bin/chcon -Rt container_file_t <backing_directory_path> 1 [Install] WantedBy=multi-user.target enabled: true name: hostpath-provisioner.service
- 1
- Specify the backing directory where you want the provisioner to create PVs. This directory must not be located in the filesystem’s root directory (
/
).
Create the
MachineConfig
object:$ oc create -f machineconfig.yaml -n <namespace>
7.18.2.3. Using the hostpath provisioner to enable local storage
To deploy the hostpath provisioner and enable your virtual machines to use local storage, first create a HostPathProvisioner
custom resource.
Prerequisites
Create a backing directory on each node for the persistent volumes (PVs) that the hostpath provisioner creates.
ImportantThe backing directory must not be located in the filesystem’s root directory because the
/
partition is read-only on Red Hat Enterprise Linux CoreOS (RHCOS). For example, you can use/var/<directory_name>
but not/<directory_name>
.Apply the SELinux context
container_file_t
to the PV backing directory on each node. For example:$ sudo chcon -t container_file_t -R <backing_directory_path>
NoteIf you use Red Hat Enterprise Linux CoreOS (RHCOS) 8 workers, you must configure SELinux by using a
MachineConfig
manifest instead.
Procedure
Create the
HostPathProvisioner
custom resource file. For example:$ touch hostpathprovisioner_cr.yaml
Edit the file, ensuring that the
spec.pathConfig.path
value is the directory where you want the hostpath provisioner to create PVs. For example:apiVersion: hostpathprovisioner.kubevirt.io/v1beta1 kind: HostPathProvisioner metadata: name: hostpath-provisioner spec: imagePullPolicy: IfNotPresent pathConfig: path: "<backing_directory_path>" 1 useNamingPrefix: false 2 workload: 3
- 1
- Specify the backing directory where you want the provisioner to create PVs. This directory must not be located in the filesystem’s root directory (
/
). - 2
- Change this value to
true
if you want to use the name of the persistent volume claim (PVC) that is bound to the created PV as the prefix of the directory name. - 3
- Optional: You can use the
spec.workload
field to configure node placement rules for the hostpath provisioner.
NoteIf you did not create the backing directory, the provisioner attempts to create it for you. If you did not apply the
container_file_t
SELinux context, this can causePermission denied
errors.Create the custom resource in the
openshift-cnv
namespace:$ oc create -f hostpathprovisioner_cr.yaml -n openshift-cnv
Additional resources
7.18.2.4. Creating a storage class
When you create a storage class, you set parameters that affect the dynamic provisioning of persistent volumes (PVs) that belong to that storage class. You cannot update a StorageClass
object’s parameters after you create it.
When using OpenShift Virtualization with OpenShift Container Platform Container Storage, specify RBD block mode persistent volume claims (PVCs) when creating virtual machine disks. With virtual machine disks, RBD block mode volumes are more efficient and provide better performance than Ceph FS or RBD filesystem-mode PVCs.
To specify RBD block mode PVCs, use the 'ocs-storagecluster-ceph-rbd' storage class and VolumeMode: Block
.
Procedure
Create a YAML file for defining the storage class. For example:
$ touch storageclass.yaml
Edit the file. For example:
apiVersion: storage.k8s.io/v1 kind: StorageClass metadata: name: hostpath-provisioner 1 provisioner: kubevirt.io/hostpath-provisioner reclaimPolicy: Delete 2 volumeBindingMode: WaitForFirstConsumer 3
- 1
- You can optionally rename the storage class by changing this value.
- 2
- The two possible
reclaimPolicy
values areDelete
andRetain
. If you do not specify a value, the storage class defaults toDelete
. - 3
- The
volumeBindingMode
value determines when dynamic provisioning and volume binding occur. SpecifyWaitForFirstConsumer
to delay the binding and provisioning of a PV until after a pod that uses the persistent volume claim (PVC) is created. This ensures that the PV meets the pod’s scheduling requirements.
NoteVirtual machines use data volumes that are based on local PVs. Local PVs are bound to specific nodes. While the disk image is prepared for consumption by the virtual machine, it is possible that the virtual machine cannot be scheduled to the node where the local storage PV was previously pinned.
To solve this problem, use the Kubernetes pod scheduler to bind the PVC to a PV on the correct node. By using
StorageClass
withvolumeBindingMode
set toWaitForFirstConsumer
, the binding and provisioning of the PV is delayed until aPod
is created using the PVC.Create the
StorageClass
object:$ oc create -f storageclass.yaml
Additional resources
7.18.3. Reserving PVC space for file system overhead
By default, the Containerized Data Importer (CDI) reserves space for file system overhead data in persistent volume claims (PVCs) that use the Filesystem
volume mode. You can set the percentage that CDI reserves for this purpose globally and for specific storage classes.
7.18.3.1. How file system overhead affects space for virtual machine disks
When you add a virtual machine disk to a persistent volume claim (PVC) that uses the Filesystem
volume mode, you must ensure that there is enough space on the PVC for:
- The virtual machine disk.
- The space that the Containerized Data Importer (CDI) reserves for file system overhead, such as metadata.
By default, CDI reserves 5.5% of the PVC space for overhead, reducing the space available for virtual machine disks by that amount.
If a different value works better for your use case, you can configure the overhead value by editing the CDI
object. You can change the value globally and you can specify values for specific storage classes.
7.18.3.2. Overriding the default file system overhead value
Change the amount of persistent volume claim (PVC) space that the Containerized Data Importer (CDI) reserves for file system overhead by editing the spec.config.filesystemOverhead
attribute of the CDI
object.
Prerequisites
-
Install the OpenShift CLI (
oc
).
Procedure
Open the
CDI
object for editing by running the following command:$ oc edit cdi
Edit the
spec.config.filesystemOverhead
fields, populating them with your chosen values:... spec: config: filesystemOverhead: global: "<new_global_value>" 1 storageClass: <storage_class_name>: "<new_value_for_this_storage_class>" 2
- 1
- The file system overhead percentage that CDI uses across the cluster. For example,
global: "0.07"
reserves 7% of the PVC for file system overhead. - 2
- The file system overhead percentage for the specified storage class. For example,
mystorageclass: "0.04"
changes the default overhead value for PVCs in themystorageclass
storage class to 4%.
-
Save and exit the editor to update the
CDI
object.
Verification
View the
CDI
status and verify your changes by running the following command:$ oc get cdi -o yaml
7.18.4. Configuring CDI to work with namespaces that have a compute resource quota
You can use the Containerized Data Importer (CDI) to import, upload, and clone virtual machine disks into namespaces that are subject to CPU and memory resource restrictions.
7.18.4.1. About CPU and memory quotas in a namespace
A resource quota, defined by the ResourceQuota
object, imposes restrictions on a namespace that limit the total amount of compute resources that can be consumed by resources within that namespace.
The CDI
object defines the user configuration for the Containerized Data Importer (CDI). The CPU and memory request and limit values for the CDI
object are set to a default value of 0. This ensures that pods created by CDI that do not specify compute resource requirements are given the default values and are allowed to run in a namespace that is restricted with a quota.
7.18.4.2. Editing the CDI object to override CPU and memory defaults
Modify the default settings for CPU and memory requests and limits for your use case by editing the spec.config.podResourceRequirements
fields of the CDI
object.
Prerequisites
-
Install the OpenShift CLI (
oc
).
Procedure
Edit the
CDI
object by running the following command:$ oc edit cdi
Change the default CPU and memory requests and limits by editing the
spec.config.podResourceRequirements
fields of theCDI
object:apiVersion: cdi.kubevirt.io/v1beta1 kind: CDI ... spec: config: podResourceRequirements: limits: cpu: "4" memory: "1Gi" requests: cpu: "1" memory: "250Mi" ...
-
Save and exit the editor to update the
CDI
object.
Verification
View the
status
field of theCDI
object to verify your changes:$ oc get cdi -o yaml
7.18.4.3. Additional resources
7.18.5. Using preallocation for data volumes
The Containerized Data Importer can preallocate disk space to improve write performance when creating data volumes.
You can enable preallocation globally for the cluster or for specific data volumes.
7.18.5.1. About preallocation
The Containerized Data Importer (CDI) can use the QEMU preallocate mode for data volumes to improve write performance. You can use preallocation mode for importing and uploading operations and when creating blank data volumes.
If preallocation is enabled, CDI uses the better preallocation method depending on the underlying file system and device type:
fallocate
-
If the file system supports it, CDI uses the operating system’s
fallocate
call to preallocate space by using theposix_fallocate
function, which allocates blocks and marks them as uninitialized. full
-
If
fallocate
mode cannot be used,full
mode allocates space for the image by writing data to the underlying storage. Depending on the storage location, all the empty allocated space might be zeroed.
7.18.5.2. Enabling preallocation globally
You can enable cluster-wide preallocation mode for the Containerized Data Importer (CDI) by adding the preallocation
field to the CDI
object.
Prerequisites
-
Install the OpenShift client (
oc
).
Procedure
Use the
oc
client to edit theCDI
object:$ oc edit cdi
Set the
spec.config.preallocation
field with a value oftrue
:apiVersion: cdi.kubevirt.io/v1beta1 kind: CDI metadata: ... spec: config: preallocation: true 1
- 1
- The
preallocation
field is a boolean that defaults to false.
-
Save and exit your editor to update the
CDI
object and enable preallocation mode.
7.18.5.3. Enabling preallocation for a data volume
If preallocation is not globally enabled for the cluster, you can enable it for specific data volumes by including the spec.preallocation
field in the data volume manifest. You can enable preallocation mode in either the web console or by using the OpenShift client (oc
).
Preallocation mode is supported for all CDI source types.
Procedure
Specify the
spec.preallocation
field in the data volume manifest:apiVersion: cdi.kubevirt.io/v1beta1 kind: DataVolume metadata: name: preallocated-datavolume spec: source: 1 ... pvc: ... preallocation: true 2
7.18.6. Uploading local disk images by using the web console
You can upload a locally stored disk image file by using the web console.
7.18.6.1. Prerequisites
- You must have a virtual machine image file in IMG, ISO, or QCOW2 format.
- If you require scratch space according to the CDI supported operations matrix, you must first define a storage class or prepare CDI scratch space for this operation to complete successfully.
7.18.6.2. CDI supported operations matrix
This matrix shows the supported CDI operations for content types against endpoints, and which of these operations requires scratch space.
Content types | HTTP | HTTPS | HTTP basic auth | Registry | Upload |
---|---|---|---|---|---|
KubeVirt(QCOW2) |
✓ QCOW2 |
✓ QCOW2** |
✓ QCOW2 |
✓ QCOW2* |
✓ QCOW2* |
KubeVirt (RAW) |
✓ RAW |
✓ RAW |
✓ RAW |
✓ RAW* |
✓ RAW* |
✓ Supported operation
□ Unsupported operation
* Requires scratch space
** Requires scratch space if a custom certificate authority is required
7.18.6.3. Uploading an image file using the web console
Use the web console to upload an image file to a new persistent volume claim (PVC). You can later use this PVC to attach the image to new virtual machines.
Prerequisites
You must have one of the following:
- A raw virtual machine image file in either ISO or IMG format.
- A virtual machine image file in QCOW2 format.
For best results, compress your image file according to the following guidelines before you upload it:
Compress a raw image file by using
xz
orgzip
.NoteUsing a compressed raw image file results in the most efficient upload.
Compress a QCOW2 image file by using the method that is recommended for your client:
- If you use a Linux client, sparsify the QCOW2 file by using the virt-sparsify tool.
-
If you use a Windows client, compress the QCOW2 file by using
xz
orgzip
.
Procedure
- From the side menu of the web console, click Storage → Persistent Volume Claims.
- Click the Create Persistent Volume Claim drop-down list to expand it.
- Click With Data Upload Form to open the Upload Data to Persistent Volume Claim page.
- Click Browse to open the file manager and select the image that you want to upload, or drag the file into the Drag a file here or browse to upload field.
Optional: Set this image as the default image for a specific operating system.
- Select the Attach this data to a virtual machine operating system check box.
- Select an operating system from the list.
- The Persistent Volume Claim Name field is automatically filled with a unique name and cannot be edited. Take note of the name assigned to the PVC so that you can identify it later, if necessary.
- Select a storage class from the Storage Class list.
In the Size field, enter the size value for the PVC. Select the corresponding unit of measurement from the drop-down list.
WarningThe PVC size must be larger than the size of the uncompressed virtual disk.
- Select an Access Mode that matches the storage class that you selected.
- Click Upload.
7.18.6.4. Additional resources
- Configure preallocation mode to improve write performance for data volume operations.
7.18.7. Uploading local disk images by using the virtctl tool
You can upload a locally stored disk image to a new or existing data volume by using the virtctl
command-line utility.
7.18.7.1. Prerequisites
-
Install the
kubevirt-virtctl
package. - If you require scratch space according to the CDI supported operations matrix, you must first define a storage class or prepare CDI scratch space for this operation to complete successfully.
7.18.7.2. About data volumes
DataVolume
objects are custom resources that are provided by the Containerized Data Importer (CDI) project. Data volumes orchestrate import, clone, and upload operations that are associated with an underlying persistent volume claim (PVC). Data volumes are integrated with OpenShift Virtualization, and they prevent a virtual machine from being started before the PVC has been prepared.
7.18.7.3. Creating an upload data volume
You can manually create a data volume with an upload
data source to use for uploading local disk images.
Procedure
Create a data volume configuration that specifies
spec: source: upload{}
:apiVersion: cdi.kubevirt.io/v1beta1 kind: DataVolume metadata: name: <upload-datavolume> 1 spec: source: upload: {} pvc: accessModes: - ReadWriteOnce resources: requests: storage: <2Gi> 2
Create the data volume by running the following command:
$ oc create -f <upload-datavolume>.yaml
7.18.7.4. Uploading a local disk image to a data volume
You can use the virtctl
CLI utility to upload a local disk image from a client machine to a data volume (DV) in your cluster. You can use a DV that already exists in your cluster or create a new DV during this procedure.
After you upload a local disk image, you can add it to a virtual machine.
Prerequisites
You must have one of the following:
- A raw virtual machine image file in either ISO or IMG format.
- A virtual machine image file in QCOW2 format.
For best results, compress your image file according to the following guidelines before you upload it:
Compress a raw image file by using
xz
orgzip
.NoteUsing a compressed raw image file results in the most efficient upload.
Compress a QCOW2 image file by using the method that is recommended for your client:
- If you use a Linux client, sparsify the QCOW2 file by using the virt-sparsify tool.
-
If you use a Windows client, compress the QCOW2 file by using
xz
orgzip
.
-
The
kubevirt-virtctl
package must be installed on the client machine. - The client machine must be configured to trust the OpenShift Container Platform router’s certificate.
Procedure
Identify the following items:
- The name of the upload data volume that you want to use. If this data volume does not exist, it is created automatically.
- The size of the data volume, if you want it to be created during the upload procedure. The size must be greater than or equal to the size of the disk image.
- The file location of the virtual machine disk image that you want to upload.
Upload the disk image by running the
virtctl image-upload
command. Specify the parameters that you identified in the previous step. For example:$ virtctl image-upload dv <datavolume_name> \ 1 --size=<datavolume_size> \ 2 --image-path=</path/to/image> \ 3
Note-
If you do not want to create a new data volume, omit the
--size
parameter and include the--no-create
flag. - When uploading a disk image to a PVC, the PVC size must be larger than the size of the uncompressed virtual disk.
-
To allow insecure server connections when using HTTPS, use the
--insecure
parameter. Be aware that when you use the--insecure
flag, the authenticity of the upload endpoint is not verified.
-
If you do not want to create a new data volume, omit the
Optional. To verify that a data volume was created, view all data volumes by running the following command:
$ oc get dvs
7.18.7.5. CDI supported operations matrix
This matrix shows the supported CDI operations for content types against endpoints, and which of these operations requires scratch space.
Content types | HTTP | HTTPS | HTTP basic auth | Registry | Upload |
---|---|---|---|---|---|
KubeVirt(QCOW2) |
✓ QCOW2 |
✓ QCOW2** |
✓ QCOW2 |
✓ QCOW2* |
✓ QCOW2* |
KubeVirt (RAW) |
✓ RAW |
✓ RAW |
✓ RAW |
✓ RAW* |
✓ RAW* |
✓ Supported operation
□ Unsupported operation
* Requires scratch space
** Requires scratch space if a custom certificate authority is required
7.18.7.6. Additional resources
- Configure preallocation mode to improve write performance for data volume operations.
7.18.8. Uploading a local disk image to a block storage data volume
You can upload a local disk image into a block data volume by using the virtctl
command-line utility.
In this workflow, you create a local block device to use as a persistent volume, associate this block volume with an upload
data volume, and use virtctl
to upload the local disk image into the data volume.
7.18.8.1. Prerequisites
-
Install the
kubevirt-virtctl
package. - If you require scratch space according to the CDI supported operations matrix, you must first define a storage class or prepare CDI scratch space for this operation to complete successfully.
7.18.8.2. About data volumes
DataVolume
objects are custom resources that are provided by the Containerized Data Importer (CDI) project. Data volumes orchestrate import, clone, and upload operations that are associated with an underlying persistent volume claim (PVC). Data volumes are integrated with OpenShift Virtualization, and they prevent a virtual machine from being started before the PVC has been prepared.
7.18.8.3. About block persistent volumes
A block persistent volume (PV) is a PV that is backed by a raw block device. These volumes do not have a file system and can provide performance benefits for virtual machines by reducing overhead.
Raw block volumes are provisioned by specifying volumeMode: Block
in the PV and persistent volume claim (PVC) specification.
7.18.8.4. Creating a local block persistent volume
Create a local block persistent volume (PV) on a node by populating a file and mounting it as a loop device. You can then reference this loop device in a PV manifest as a Block
volume and use it as a block device for a virtual machine image.
Procedure
-
Log in as
root
to the node on which to create the local PV. This procedure usesnode01
for its examples. Create a file and populate it with null characters so that it can be used as a block device. The following example creates a file
loop10
with a size of 2Gb (20 100Mb blocks):$ dd if=/dev/zero of=<loop10> bs=100M count=20
Mount the
loop10
file as a loop device.$ losetup </dev/loop10>d3 <loop10> 1 2
Create a
PersistentVolume
manifest that references the mounted loop device.kind: PersistentVolume apiVersion: v1 metadata: name: <local-block-pv10> annotations: spec: local: path: </dev/loop10> 1 capacity: storage: <2Gi> volumeMode: Block 2 storageClassName: local 3 accessModes: - ReadWriteOnce persistentVolumeReclaimPolicy: Delete nodeAffinity: required: nodeSelectorTerms: - matchExpressions: - key: kubernetes.io/hostname operator: In values: - <node01> 4
Create the block PV.
# oc create -f <local-block-pv10.yaml>1
- 1
- The file name of the persistent volume created in the previous step.
7.18.8.5. Creating an upload data volume
You can manually create a data volume with an upload
data source to use for uploading local disk images.
Procedure
Create a data volume configuration that specifies
spec: source: upload{}
:apiVersion: cdi.kubevirt.io/v1beta1 kind: DataVolume metadata: name: <upload-datavolume> 1 spec: source: upload: {} pvc: accessModes: - ReadWriteOnce resources: requests: storage: <2Gi> 2
Create the data volume by running the following command:
$ oc create -f <upload-datavolume>.yaml
7.18.8.6. Uploading a local disk image to a data volume
You can use the virtctl
CLI utility to upload a local disk image from a client machine to a data volume (DV) in your cluster. You can use a DV that already exists in your cluster or create a new DV during this procedure.
After you upload a local disk image, you can add it to a virtual machine.
Prerequisites
You must have one of the following:
- A raw virtual machine image file in either ISO or IMG format.
- A virtual machine image file in QCOW2 format.
For best results, compress your image file according to the following guidelines before you upload it:
Compress a raw image file by using
xz
orgzip
.NoteUsing a compressed raw image file results in the most efficient upload.
Compress a QCOW2 image file by using the method that is recommended for your client:
- If you use a Linux client, sparsify the QCOW2 file by using the virt-sparsify tool.
-
If you use a Windows client, compress the QCOW2 file by using
xz
orgzip
.
-
The
kubevirt-virtctl
package must be installed on the client machine. - The client machine must be configured to trust the OpenShift Container Platform router’s certificate.
Procedure
Identify the following items:
- The name of the upload data volume that you want to use. If this data volume does not exist, it is created automatically.
- The size of the data volume, if you want it to be created during the upload procedure. The size must be greater than or equal to the size of the disk image.
- The file location of the virtual machine disk image that you want to upload.
Upload the disk image by running the
virtctl image-upload
command. Specify the parameters that you identified in the previous step. For example:$ virtctl image-upload dv <datavolume_name> \ 1 --size=<datavolume_size> \ 2 --image-path=</path/to/image> \ 3
Note-
If you do not want to create a new data volume, omit the
--size
parameter and include the--no-create
flag. - When uploading a disk image to a PVC, the PVC size must be larger than the size of the uncompressed virtual disk.
-
To allow insecure server connections when using HTTPS, use the
--insecure
parameter. Be aware that when you use the--insecure
flag, the authenticity of the upload endpoint is not verified.
-
If you do not want to create a new data volume, omit the
Optional. To verify that a data volume was created, view all data volumes by running the following command:
$ oc get dvs
7.18.8.7. CDI supported operations matrix
This matrix shows the supported CDI operations for content types against endpoints, and which of these operations requires scratch space.
Content types | HTTP | HTTPS | HTTP basic auth | Registry | Upload |
---|---|---|---|---|---|
KubeVirt(QCOW2) |
✓ QCOW2 |
✓ QCOW2** |
✓ QCOW2 |
✓ QCOW2* |
✓ QCOW2* |
KubeVirt (RAW) |
✓ RAW |
✓ RAW |
✓ RAW |
✓ RAW* |
✓ RAW* |
✓ Supported operation
□ Unsupported operation
* Requires scratch space
** Requires scratch space if a custom certificate authority is required
7.18.8.8. Additional resources
- Configure preallocation mode to improve write performance for data volume operations.
7.18.9. Managing offline virtual machine snapshots
You can create, restore, and delete virtual machine (VM) snapshots for VMs that are powered off (offline). OpenShift Virtualization supports offline VM snapshots on:
- Red Hat OpenShift Container Storage
- Any other storage provider with the Container Storage Interface (CSI) driver that supports the Kubernetes Volume Snapshot API
7.18.9.1. About virtual machine snapshots
A snapshot represents the state and data of a virtual machine (VM) at a specific point in time. You can use a snapshot to restore an existing VM to a previous state (represented by the snapshot) for backup and disaster recovery or to rapidly roll back to a previous development version.
An offline VM snapshot is created from a VM that is powered off (Stopped state). The snapshot stores a copy of each Container Storage Interface (CSI) volume attached to the VM and a copy of the VM specification and metadata. Snapshots cannot be changed after creation.
With the offline VM snapshots feature, cluster administrators and application developers can:
- Create a new snapshot
- List all snapshots attached to a specific VM
- Restore a VM from a snapshot
- Delete an existing VM snapshot
7.18.9.1.1. Virtual machine snapshot controller and custom resource definitions (CRDs)
The VM snapshot feature introduces three new API objects defined as CRDs for managing snapshots:
-
VirtualMachineSnapshot
: Represents a user request to create a snapshot. It contains information about the current state of the VM. -
VirtualMachineSnapshotContent
: Represents a provisioned resource on the cluster (a snapshot). It is created by the VM snapshot controller and contains references to all resources required to restore the VM. -
VirtualMachineRestore
: Represents a user request to restore a VM from a snapshot.
The VM snapshot controller binds a VirtualMachineSnapshotContent
object with the VirtualMachineSnapshot
object for which it was created, with a one-to-one mapping.
7.18.9.2. Creating an offline virtual machine snapshot in the web console
You can create a virtual machine (VM) snapshot by using the web console.
The VM snapshot only includes disks that meet the following requirements:
- Must be either a data volume or persistent volume claim
- Belong to a storage class that supports Container Storage Interface (CSI) volume snapshots
If your VM storage includes disks that do not support snapshots, you can either edit them or contact your cluster administrator.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
- If the virtual machine is running, click Actions → Stop Virtual Machine to power it down.
- Click the Snapshots tab and then click Take Snapshot.
- Fill in the Snapshot Name and optional Description fields.
- Expand Disks included in this Snapshot to see the storage volumes to be included in the snapshot.
- If your VM has disks that cannot be included in the snapshot and you still wish to proceed, select the I am aware of this warning and wish to proceed checkbox.
- Click Save.
7.18.9.3. Creating an offline virtual machine snapshot in the CLI
You can create a virtual machine (VM) snapshot for an offline VM by creating a VirtualMachineSnapshot
object.
Prerequisites
- Ensure that the persistent volume claims (PVCs) are in a storage class that supports Container Storage Interface (CSI) volume snapshots.
-
Install the OpenShift CLI (
oc
). - Power down the VM for which you want to create a snapshot.
Procedure
Create a YAML file to define a
VirtualMachineSnapshot
object that specifies the name of the newVirtualMachineSnapshot
and the name of the source VM.For example:
apiVersion: snapshot.kubevirt.io/v1alpha1 kind: VirtualMachineSnapshot metadata: name: my-vmsnapshot 1 spec: source: apiGroup: kubevirt.io kind: VirtualMachine name: my-vm 2
Create the
VirtualMachineSnapshot
resource. The snapshot controller creates aVirtualMachineSnapshotContent
object, binds it to theVirtualMachineSnapshot
and updates thestatus
andreadyToUse
fields of theVirtualMachineSnapshot
object.$ oc create -f <my-vmsnapshot>.yaml
Verification
Verify that the
VirtualMachineSnapshot
object is created and bound withVirtualMachineSnapshotContent
. ThereadyToUse
flag must be set totrue
.$ oc describe vmsnapshot <my-vmsnapshot>
Example output
apiVersion: snapshot.kubevirt.io/v1alpha1 kind: VirtualMachineSnapshot metadata: creationTimestamp: "2020-09-30T14:41:51Z" finalizers: - snapshot.kubevirt.io/vmsnapshot-protection generation: 5 name: mysnap namespace: default resourceVersion: "3897" selfLink: /apis/snapshot.kubevirt.io/v1alpha1/namespaces/default/virtualmachinesnapshots/my-vmsnapshot uid: 28eedf08-5d6a-42c1-969c-2eda58e2a78d spec: source: apiGroup: kubevirt.io kind: VirtualMachine name: my-vm status: conditions: - lastProbeTime: null lastTransitionTime: "2020-09-30T14:42:03Z" reason: Operation complete status: "False" 1 type: Progressing - lastProbeTime: null lastTransitionTime: "2020-09-30T14:42:03Z" reason: Operation complete status: "True" 2 type: Ready creationTime: "2020-09-30T14:42:03Z" readyToUse: true 3 sourceUID: 355897f3-73a0-4ec4-83d3-3c2df9486f4f virtualMachineSnapshotContentName: vmsnapshot-content-28eedf08-5d6a-42c1-969c-2eda58e2a78d 4
- 1
- The
status
field of theProgressing
condition specifies if the snapshot is still being created. - 2
- The
status
field of theReady
condition specifies if the snapshot creation process is complete. - 3
- Specifies if the snapshot is ready to be used.
- 4
- Specifies that the snapshot is bound to a
VirtualMachineSnapshotContent
object created by the snapshot controller.
-
Check the
spec:volumeBackups
property of theVirtualMachineSnapshotContent
resource to verify that the expected PVCs are included in the snapshot.
7.18.9.4. Restoring a virtual machine from a snapshot in the web console
You can restore a virtual machine (VM) to a previous configuration represented by a snapshot in the web console.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
- If the virtual machine is running, click Actions → Stop Virtual Machine to power it down.
- Click the Snapshots tab. The page displays a list of snapshots associated with the virtual machine.
Choose one of the following methods to restore a VM snapshot:
- For the snapshot that you want to use as the source to restore the VM, click Restore.
- Select a snapshot to open the Snapshot Details screen and click Actions → Restore Virtual Machine Snapshot.
- In the confirmation pop-up window, click Restore to restore the VM to its previous configuration represented by the snapshot.
7.18.9.5. Restoring a virtual machine from a snapshot in the CLI
You can restore an existing virtual machine (VM) to a previous configuration by using a VM snapshot .
Prerequisites
-
Install the OpenShift CLI (
oc
). - Power down the VM you want to restore to a previous state.
Procedure
Create a YAML file to define a
VirtualMachineRestore
object that specifies the name of the VM you want to restore and the name of the snapshot to be used as the source.For example:
apiVersion: snapshot.kubevirt.io/v1alpha1 kind: VirtualMachineRestore metadata: name: my-vmrestore 1 spec: target: apiGroup: kubevirt.io kind: VirtualMachine name: my-vm 2 virtualMachineSnapshotName: my-vmsnapshot 3
Create the
VirtualMachineRestore
resource. The snapshot controller updates the status fields of theVirtualMachineRestore
object and replaces the existing VM configuration with the snapshot content.$ oc create -f <my-vmrestore>.yaml
Verification
Verify that the VM is restored to the previous state represented by the snapshot. The
complete
flag must be set totrue
.$ oc get vmrestore <my-vmrestore>
Example output
apiVersion: snapshot.kubevirt.io/v1alpha1 kind: VirtualMachineRestore metadata: creationTimestamp: "2020-09-30T14:46:27Z" generation: 5 name: my-vmrestore namespace: default ownerReferences: - apiVersion: kubevirt.io/v1alpha3 blockOwnerDeletion: true controller: true kind: VirtualMachine name: my-vm uid: 355897f3-73a0-4ec4-83d3-3c2df9486f4f resourceVersion: "5512" selfLink: /apis/snapshot.kubevirt.io/v1alpha1/namespaces/default/virtualmachinerestores/my-vmrestore uid: 71c679a8-136e-46b0-b9b5-f57175a6a041 spec: target: apiGroup: kubevirt.io kind: VirtualMachine name: my-vm virtualMachineSnapshotName: my-vmsnapshot status: complete: true 1 conditions: - lastProbeTime: null lastTransitionTime: "2020-09-30T14:46:28Z" reason: Operation complete status: "False" 2 type: Progressing - lastProbeTime: null lastTransitionTime: "2020-09-30T14:46:28Z" reason: Operation complete status: "True" 3 type: Ready deletedDataVolumes: - test-dv1 restoreTime: "2020-09-30T14:46:28Z" restores: - dataVolumeName: restore-71c679a8-136e-46b0-b9b5-f57175a6a041-datavolumedisk1 persistentVolumeClaim: restore-71c679a8-136e-46b0-b9b5-f57175a6a041-datavolumedisk1 volumeName: datavolumedisk1 volumeSnapshotName: vmsnapshot-28eedf08-5d6a-42c1-969c-2eda58e2a78d-volume-datavolumedisk1
7.18.9.6. Deleting a virtual machine snapshot in the web console
You can delete an existing virtual machine snapshot by using the web console.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
- Click the Snapshots tab. The page displays a list of snapshots associated with the virtual machine.
Choose one of the following methods to delete a virtual machine snapshot:
- Click the Options menu of the virtual machine snapshot that you want to delete and select Delete Virtual Machine Snapshot.
- Select a snapshot to open the Snapshot Details screen and click Actions → Delete Virtual Machine Snapshot.
- In the confirmation pop-up window, click Delete to delete the snapshot.
7.18.9.7. Deleting a virtual machine snapshot in the CLI
You can delete an existing virtual machine (VM) snapshot by deleting the appropriate VirtualMachineSnapshot
object.
Prerequisites
-
Install the OpenShift CLI (
oc
).
Procedure
Delete the
VirtualMachineSnapshot
object. The snapshot controller deletes theVirtualMachineSnapshot
along with the associatedVirtualMachineSnapshotContent
object.$ oc delete vmsnapshot <my-vmsnapshot>
Verification
Verify that the snapshot is deleted and no longer attached to this VM:
$ oc get vmsnapshot
7.18.9.8. Additional resources
7.18.10. Moving a local virtual machine disk to a different node
Virtual machines that use local volume storage can be moved so that they run on a specific node.
You might want to move the virtual machine to a specific node for the following reasons:
- The current node has limitations to the local storage configuration.
- The new node is better optimized for the workload of that virtual machine.
To move a virtual machine that uses local storage, you must clone the underlying volume by using a data volume. After the cloning operation is complete, you can edit the virtual machine configuration so that it uses the new data volume, or add the new data volume to another virtual machine.
Users without the cluster-admin
role require additional user permissions to clone volumes across namespaces.
7.18.10.1. Cloning a local volume to another node
You can move a virtual machine disk so that it runs on a specific node by cloning the underlying persistent volume claim (PVC).
To ensure the virtual machine disk is cloned to the correct node, you must either create a new persistent volume (PV) or identify one on the correct node. Apply a unique label to the PV so that it can be referenced by the data volume.
The destination PV must be the same size or larger than the source PVC. If the destination PV is smaller than the source PVC, the cloning operation fails.
Prerequisites
- The virtual machine must not be running. Power down the virtual machine before cloning the virtual machine disk.
Procedure
Either create a new local PV on the node, or identify a local PV already on the node:
Create a local PV that includes the
nodeAffinity.nodeSelectorTerms
parameters. The following manifest creates a10Gi
local PV onnode01
.kind: PersistentVolume apiVersion: v1 metadata: name: <destination-pv> 1 annotations: spec: accessModes: - ReadWriteOnce capacity: storage: 10Gi 2 local: path: /mnt/local-storage/local/disk1 3 nodeAffinity: required: nodeSelectorTerms: - matchExpressions: - key: kubernetes.io/hostname operator: In values: - node01 4 persistentVolumeReclaimPolicy: Delete storageClassName: local volumeMode: Filesystem
Identify a PV that already exists on the target node. You can identify the node where a PV is provisioned by viewing the
nodeAffinity
field in its configuration:$ oc get pv <destination-pv> -o yaml
The following snippet shows that the PV is on
node01
:Example output
... spec: nodeAffinity: required: nodeSelectorTerms: - matchExpressions: - key: kubernetes.io/hostname 1 operator: In values: - node01 2 ...
Add a unique label to the PV:
$ oc label pv <destination-pv> node=node01
Create a data volume manifest that references the following:
- The PVC name and namespace of the virtual machine.
- The label you applied to the PV in the previous step.
The size of the destination PV.
apiVersion: cdi.kubevirt.io/v1beta1 kind: DataVolume metadata: name: <clone-datavolume> 1 spec: source: pvc: name: "<source-vm-disk>" 2 namespace: "<source-namespace>" 3 pvc: accessModes: - ReadWriteOnce selector: matchLabels: node: node01 4 resources: requests: storage: <10Gi> 5
- 1
- The name of the new data volume.
- 2
- The name of the source PVC. If you do not know the PVC name, you can find it in the virtual machine configuration:
spec.volumes.persistentVolumeClaim.claimName
. - 3
- The namespace where the source PVC exists.
- 4
- The label that you applied to the PV in the previous step.
- 5
- The size of the destination PV.
Start the cloning operation by applying the data volume manifest to your cluster:
$ oc apply -f <clone-datavolume.yaml>
The data volume clones the PVC of the virtual machine into the PV on the specific node.
7.18.11. Expanding virtual storage by adding blank disk images
You can increase your storage capacity or create new data partitions by adding blank disk images to OpenShift Virtualization.
7.18.11.1. About data volumes
DataVolume
objects are custom resources that are provided by the Containerized Data Importer (CDI) project. Data volumes orchestrate import, clone, and upload operations that are associated with an underlying persistent volume claim (PVC). Data volumes are integrated with OpenShift Virtualization, and they prevent a virtual machine from being started before the PVC has been prepared.
7.18.11.2. Creating a blank disk image with data volumes
You can create a new blank disk image in a persistent volume claim by customizing and deploying a data volume configuration file.
Prerequisites
- At least one available persistent volume.
-
Install the OpenShift CLI (
oc
).
Procedure
Edit the data volume configuration file:
apiVersion: cdi.kubevirt.io/v1beta1 kind: DataVolume metadata: name: blank-image-datavolume spec: source: blank: {} pvc: # Optional: Set the storage class or omit to accept the default # storageClassName: "hostpath" accessModes: - ReadWriteOnce resources: requests: storage: 500Mi
Create the blank disk image by running the following command:
$ oc create -f <blank-image-datavolume>.yaml
7.18.11.3. Template: Data volume configuration file for blank disk images
blank-image-datavolume.yaml
apiVersion: cdi.kubevirt.io/v1beta1 kind: DataVolume metadata: name: blank-image-datavolume spec: source: blank: {} pvc: # Optional: Set the storage class or omit to accept the default # storageClassName: "hostpath" accessModes: - ReadWriteOnce resources: requests: storage: 500Mi
7.18.11.4. Additional resources
- Configure preallocation mode to improve write performance for data volume operations.
7.18.12. Cloning a data volume using smart-cloning
Smart-cloning is a built-in feature of OpenShift Container Platform Storage (OCS), designed to enhance performance of the cloning process. Clones created with smart-cloning are faster and more efficient than host-assisted cloning.
You do not need to perform any action to enable smart-cloning, but you need to ensure your storage environment is compatible with smart-cloning to use this feature.
When you create a data volume with a persistent volume claim (PVC) source, you automatically initiate the cloning process. You always receive a clone of the data volume, if your environment supports smart-cloning or not. However, you will only receive the performance benefits of smart cloning if you storage provider supports smart-cloning.
7.18.12.1. Understanding smart-cloning
When a data volume is smart-cloned, the following occurs:
- A snapshot of the source persistent volume claim (PVC) is created.
- A PVC is created from the snapshot.
- The snapshot is deleted.
7.18.12.2. Cloning a data volume
Prerequisites
For smart-cloning to occur, the following conditions are required.
- Your storage provider must support snapshots.
- The source and target PVCs must be defined to the same namespace.
- The source and target PVCs must be defined to the same storage class.
-
The
VolumeSnapshotClass
object must reference the storage class defined to both the source and target PVCs.
If any of these prerequisites are not met, host-assisted cloning automatically occurs when you create a data volume with a PVC source.
Procedure
To initiate cloning of a data volume:
Create a YAML file for a
DataVolume
object that specifies the name of the new data volume, the name and namespace of the source PVC, and the size of the new data volume. This example clones a source PVC in block mode, sovolumeMode: Block
is used:apiVersion: cdi.kubevirt.io/v1beta1 kind: DataVolume metadata: name: <cloner-datavolume> 1 spec: source: pvc: namespace: "<source-namespace>" 2 name: "<my-favorite-vm-disk>" 3 pvc: accessModes: - ReadWriteMany resources: requests: storage: <2Gi> 4 volumeMode: Block 5
- 1
- The name of the new data volume.
- 2
- The namespace where the source PVC exists.
- 3
- The name of the source PVC.
- 4
- The size of the new data volume. You must allocate enough space, or the cloning operation fails. The size must be the same as or larger than the source PVC.
- 5
- Specifies that the destination is a block PV.
Start cloning the PVC by creating the data volume:
$ oc create -f <cloner-datavolume>.yaml
NoteData volumes prevent a virtual machine from starting before the PVC is prepared, so you can create a virtual machine that references the new data volume while the PVC clones.
7.18.12.3. Additional resources
- Cloning the persistent volume claim of a virtual machine disk into a new data volume
- Configure preallocation mode to improve write performance for data volume operations.
7.18.13. Storage defaults for data volumes
The kubevirt-storage-class-defaults
config map provides access mode and volume mode defaults for data volumes. You can edit or add storage class defaults to the config map to create data volumes in the web console that better match the underlying storage.
7.18.13.1. About storage settings for data volumes
Data volumes require a defined access mode and volume mode to be created in the web console. These storage settings are configured by default with a ReadWriteOnce
access mode and Filesystem
volume mode.
You can modify these settings by editing the kubevirt-storage-class-defaults
config map in the openshift-cnv
namespace. You can also add settings for other storage classes to create data volumes in the web console for different storage types.
You must configure storage settings that are supported by the underlying storage.
All data volumes that you create in the web console use the default storage settings unless you specify a storage class that is also defined in the config map.
7.18.13.1.1. Access modes
Data volumes support the following access modes:
-
ReadWriteOnce
: The volume can be mounted as read-write by a single node.ReadWriteOnce
has greater versatility and is the default setting. -
ReadWriteMany
: The volume can be mounted as read-write by many nodes.ReadWriteMany
is required for some features, such as live migration of virtual machines between nodes.
ReadWriteMany
is recommended if the underlying storage supports it.
7.18.13.1.2. Volume modes
The volume mode defines if a volume is intended to be used with a formatted file system or to remain in raw block state. Data volumes support the following volume modes:
-
Filesystem
: Creates a file system on the data volume. This is the default setting. -
Block
: Creates a block data volume. Only useBlock
if the underlying storage supports it.
7.18.13.2. Editing the kubevirt-storage-class-defaults config map in the web console
Modify the storage settings for data volumes by editing the kubevirt-storage-class-defaults
config map in the openshift-cnv
namespace. You can also add settings for other storage classes to create data volumes in the web console for different storage types.
You must configure storage settings that are supported by the underlying storage.
Procedure
- Click Workloads → Config Maps from the side menu.
- In the Project list, select openshift-cnv.
- Click kubevirt-storage-class-defaults to open the Config Map Overview.
- Click the YAML tab to display the editable configuration.
Update the
data
values with the storage configuration that is appropriate for your underlying storage:... data: accessMode: ReadWriteOnce 1 volumeMode: Filesystem 2 <new>.accessMode: ReadWriteMany 3 <new>.volumeMode: Block 4
- 1
- The default accessMode is
ReadWriteOnce
. - 2
- The default volumeMode is
Filesystem
. - 3
- If you add an access mode for a storage class, replace the
<new>
part of the parameter with the storage class name. - 4
- If you add a volume mode for a storage class, replace the
<new>
part of the parameter with the storage class name.
- Click Save to update the config map.
7.18.13.3. Editing the kubevirt-storage-class-defaults config map in the CLI
Modify the storage settings for data volumes by editing the kubevirt-storage-class-defaults
config map in the openshift-cnv
namespace. You can also add settings for other storage classes to create data volumes in the web console for different storage types.
You must configure storage settings that are supported by the underlying storage.
Procedure
Edit the config map by running the following command:
$ oc edit configmap kubevirt-storage-class-defaults -n openshift-cnv
Update the
data
values of the config map:... data: accessMode: ReadWriteOnce 1 volumeMode: Filesystem 2 <new>.accessMode: ReadWriteMany 3 <new>.volumeMode: Block 4
- 1
- The default accessMode is
ReadWriteOnce
. - 2
- The default volumeMode is
Filesystem
. - 3
- If you add an access mode for a storage class, replace the
<new>
part of the parameter with the storage class name. - 4
- If you add a volume mode for a storage class, replace the
<new>
part of the parameter with the storage class name.
- Save and exit the editor to update the config map.
7.18.13.4. Example of multiple storage class defaults
The following YAML file is an example of a kubevirt-storage-class-defaults
config map that has storage settings configured for two storage classes, migration
and block
.
Ensure that all settings are supported by your underlying storage before you update the config map.
kind: ConfigMap apiVersion: v1 metadata: name: kubevirt-storage-class-defaults namespace: openshift-cnv ... data: accessMode: ReadWriteOnce volumeMode: Filesystem nfs-sc.accessMode: ReadWriteMany nfs-sc.volumeMode: Filesystem block-sc.accessMode: ReadWriteMany block-sc.volumeMode: Block
7.18.14. Creating and using boot sources
A boot source contains a bootable operating system (OS) and all of the configuration settings for the OS, such as drivers.
You use a boot source to create virtual machine templates with specific configurations. These templates can be used to create any number of available virtual machines.
Quick Start tours are available in the OpenShift Container Platform web console to assist you in creating a custom boot source, uploading a boot source, and other tasks. Select Quick Starts from the Help menu to view the Quick Start tours.
Prerequisites
-
To add a boot source, you must be logged in as a user with the
os-images.kubevirt.io:edit
RBAC role or as an administrator. You do not need special privileges to create a virtual machine from a template with a boot source attached.
For information about requirements for Microsoft Windows, refer to Creating installation media for Windows boot sources.
7.18.14.1. Adding a boot source for a virtual machine template
A boot source can be configured for any virtual machine template that you want to use for creating virtual machines or custom templates. When virtual machine templates are configured with a boot source, they are labeled Available in the Templates tab. After you add a boot source to a template, you can create a new virtual machine from the template.
There are four methods for selecting and adding a boot source in the web console:
- Upload local file (creates PVC)
- Import via URL (creates PVC)
- Clone existing PVC (creates PVC)
- Import via Registry (creates PVC)
Prerequisites
-
To add a boot source, you must be logged in as a user with the
os-images.kubevirt.io:edit
RBAC role or as an administrator. You do not need special privileges to create a virtual machine from a template with a boot source added. - To upload a local file, the operating system image file must exist on your local machine.
- To import via URL, access to the web server with the operating system image is required. For example: the Red Hat Enterprise Linux web page with images.
- To clone an existing PVC, access to the project with a PVC is required.
- To import via registry, access to the container registry is required.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Templates tab.
- Identify the virtual machine template for which you want to configure a boot source and click Add source.
- In the Add boot source to template window, click Select boot source, select a method for creating a persistent volume claim (PVC): Upload local file, Import via URL, Clone existing PVC, or Import via Registry.
- Optional: Click This is a CD-ROM boot source to mount a CD-ROM and use it to install the operating system on to an empty disk. The additional empty disk is automatically created and mounted by OpenShift Virtualization. If the additional disk is not needed, you can remove it when you create the virtual machine.
Enter a value for Persistent Volume Claim size to specify the PVC size that is adequate for the uncompressed image and any additional space that is required.
- Optional: Enter a name for Source provider to associate the name with this template.
- Advanced: Click Storage class and select the storage class that is used to create the disk.
- Advanced: Click Access mode and select an access mode for the persistent volume. Supported access modes are: Single User (RWO), Shared Access (RWX), and Read Only (ROX).
- Advanced: Click Volume mode if you want to select Block instead of the default value Filesystem.
Select the appropriate method to save your boot source:
- Click Save and upload if you uploaded a local file.
- Click Save and import if you imported content from a URL or the registry.
- Click Save and clone if you cloned an existing PVC.
Your custom virtual machine template with a boot source is listed in the Templates tab, and you can create virtual machines by using this template.
7.18.14.2. Creating a virtual machine from a template with an attached boot source
After you add a boot source to a template, you can create a new virtual machine from the template.
Procedure
- In the OpenShift Container Platform web console, click Workloads > Virtualization in the side menu.
- From the Virtual Machines tab or the Templates tab, click Create and select Virtual Machine with Wizard.
- In the General step, select an OS from the Operating System list that has the (Source available) label next to the OS and version name. The (Source available) label indicates that a boot source is available for this OS.
- In the Select a template step, select an OS from the Operating System list that has the (Source available) label next to the OS and version name. The (Source available) label indicates that a boot source is available for this OS.
- Click Review and Confirm.
- Review your virtual machine settings and edit them, if required.
- Click Create Virtual Machine to create your virtual machine. The Successfully created virtual machine page is displayed.
7.18.14.3. Additional resources
7.18.15. Using container disks with virtual machines
You can build a virtual machine image into a container disk and store it in your container registry. You can then import the container disk into persistent storage for a virtual machine or attach it directly to the virtual machine for ephemeral storage.
If you use large container disks, I/O traffic might increase, impacting worker nodes. This can lead to unavailable nodes. You can resolve this by:
7.18.15.1. About container disks
A container disk is a virtual machine image that is stored as a container image in a container image registry. You can use container disks to deliver the same disk images to multiple virtual machines and to create large numbers of virtual machine clones.
A container disk can either be imported into a persistent volume claim (PVC) by using a data volume that is attached to a virtual machine, or attached directly to a virtual machine as an ephemeral containerDisk
volume.
7.18.15.1.1. Importing a container disk into a PVC by using a data volume
Use the Containerized Data Importer (CDI) to import the container disk into a PVC by using a data volume. You can then attach the data volume to a virtual machine for persistent storage.
7.18.15.1.2. Attaching a container disk to a virtual machine as a containerDisk
volume
A containerDisk
volume is ephemeral. It is discarded when the virtual machine is stopped, restarted, or deleted. When a virtual machine with a containerDisk
volume starts, the container image is pulled from the registry and hosted on the node that is hosting the virtual machine.
Use containerDisk
volumes for read-only file systems such as CD-ROMs or for disposable virtual machines.
Using containerDisk
volumes for read-write file systems is not recommended because the data is temporarily written to local storage on the hosting node. This slows live migration of the virtual machine, such as in the case of node maintenance, because the data must be migrated to the destination node. Additionally, all data is lost if the node loses power or otherwise shuts down unexpectedly.
7.18.15.2. Preparing a container disk for virtual machines
You must build a container disk with a virtual machine image and push it to a container registry before it can used with a virtual machine. You can then either import the container disk into a PVC using a data volume and attach it to a virtual machine, or you can attach the container disk directly to a virtual machine as an ephemeral containerDisk
volume.
The size of a disk image inside a container disk is limited by the maximum layer size of the registry where the container disk is hosted.
For Red Hat Quay, you can change the maximum layer size by editing the YAML configuration file that is created when Red Hat Quay is first deployed.
Prerequisites
-
Install
podman
if it is not already installed. - The virtual machine image must be either QCOW2 or RAW format.
Procedure
Create a Dockerfile to build the virtual machine image into a container image. The virtual machine image must be owned by QEMU, which has a UID of
107
, and placed in the/disk/
directory inside the container. Permissions for the/disk/
directory must then be set to0440
.The following example uses the Red Hat Universal Base Image (UBI) to handle these configuration changes in the first stage, and uses the minimal
scratch
image in the second stage to store the result:$ cat > Dockerfile << EOF FROM registry.access.redhat.com/ubi8/ubi:latest AS builder ADD --chown=107:107 <vm_image>.qcow2 /disk/ 1 RUN chmod 0440 /disk/* FROM scratch COPY --from=builder /disk/* /disk/ EOF
- 1
- Where <vm_image> is the virtual machine image in either QCOW2 or RAW format.
To use a remote virtual machine image, replace<vm_image>.qcow2
with the complete url for the remote image.
Build and tag the container:
$ podman build -t <registry>/<container_disk_name>:latest .
Push the container image to the registry:
$ podman push <registry>/<container_disk_name>:latest
If your container registry does not have TLS you must add it as an insecure registry before you can import container disks into persistent storage.
7.18.15.3. Disabling TLS for a container registry to use as insecure registry
You can disable TLS (transport layer security) for a container registry by adding the registry to the cdi-insecure-registries
config map.
Prerequisites
-
Log in to the cluster as a user with the
cluster-admin
role.
Procedure
Add the registry to the
cdi-insecure-registries
config map in theopenshift-cnv
namespace.$ oc patch configmap cdi-insecure-registries -n openshift-cnv \ --type merge -p '{"data":{"mykey": "<insecure-registry-host>:5000"}}' 1
- 1
- Replace
<insecure-registry-host>
with the registry hostname.
7.18.15.4. Next steps
- Import the container disk into persistent storage for a virtual machine.
-
Create a virtual machine that uses a
containerDisk
volume for ephemeral storage.
7.18.16. Preparing CDI scratch space
7.18.16.1. About data volumes
DataVolume
objects are custom resources that are provided by the Containerized Data Importer (CDI) project. Data volumes orchestrate import, clone, and upload operations that are associated with an underlying persistent volume claim (PVC). Data volumes are integrated with OpenShift Virtualization, and they prevent a virtual machine from being started before the PVC has been prepared.
7.18.16.2. Understanding scratch space
The Containerized Data Importer (CDI) requires scratch space (temporary storage) to complete some operations, such as importing and uploading virtual machine images. During this process, CDI provisions a scratch space PVC equal to the size of the PVC backing the destination data volume (DV). The scratch space PVC is deleted after the operation completes or aborts.
You can define the storage class that is used to bind the scratch space PVC in the spec.config.scratchSpaceStorageClass
field of the CDI
object.
If the defined storage class does not match a storage class in the cluster, then the default storage class defined for the cluster is used. If there is no default storage class defined in the cluster, the storage class used to provision the original DV or PVC is used.
CDI requires requesting scratch space with a file
volume mode, regardless of the PVC backing the origin data volume. If the origin PVC is backed by block
volume mode, you must define a storage class capable of provisioning file
volume mode PVCs.
Manual provisioning
If there are no storage classes, CDI uses any PVCs in the project that match the size requirements for the image. If there are no PVCs that match these requirements, the CDI import pod remains in a Pending state until an appropriate PVC is made available or until a timeout function kills the pod.
7.18.16.3. CDI operations that require scratch space
Type | Reason |
---|---|
Registry imports | CDI must download the image to a scratch space and extract the layers to find the image file. The image file is then passed to QEMU-IMG for conversion to a raw disk. |
Upload image | QEMU-IMG does not accept input from STDIN. Instead, the image to upload is saved in scratch space before it can be passed to QEMU-IMG for conversion. |
HTTP imports of archived images | QEMU-IMG does not know how to handle the archive formats CDI supports. Instead, the image is unarchived and saved into scratch space before it is passed to QEMU-IMG. |
HTTP imports of authenticated images | QEMU-IMG inadequately handles authentication. Instead, the image is saved to scratch space and authenticated before it is passed to QEMU-IMG. |
HTTP imports of custom certificates | QEMU-IMG inadequately handles custom certificates of HTTPS endpoints. Instead, CDI downloads the image to scratch space before passing the file to QEMU-IMG. |
7.18.16.4. Defining a storage class in the CDI object
Dynamically provision scratch space for CDI operations by defining a storage class in the CDI
object.
Prerequisites
-
Install the OpenShift client (
oc
).
Procedure
Use the
oc
client to edit theCDI
object:$ oc edit cdi
Edit the
spec.config.scratchSpaceStorageClass
field to match a storage class in the cluster.apiVersion: cdi.kubevirt.io/v1beta1 kind: CDI ... spec: config: scratchSpaceStorageClass: "<storage_class>" 1 ...
- 1
- Replace
<storage_class>
with the storage class that you want to use to provision scratch space for CDI operations in your cluster.
-
Save and exit your default editor to update the
CDI
object.
7.18.16.5. CDI supported operations matrix
This matrix shows the supported CDI operations for content types against endpoints, and which of these operations requires scratch space.
Content types | HTTP | HTTPS | HTTP basic auth | Registry | Upload |
---|---|---|---|---|---|
KubeVirt(QCOW2) |
✓ QCOW2 |
✓ QCOW2** |
✓ QCOW2 |
✓ QCOW2* |
✓ QCOW2* |
KubeVirt (RAW) |
✓ RAW |
✓ RAW |
✓ RAW |
✓ RAW* |
✓ RAW* |
✓ Supported operation
□ Unsupported operation
* Requires scratch space
** Requires scratch space if a custom certificate authority is required
Additional resources
- See the Dynamic provisioning section for more information on storage classes and how these are defined in the cluster.
7.18.17. Re-using persistent volumes
To re-use a statically provisioned persistent volume (PV), you must first reclaim the volume. This involves deleting the PV so that the storage configuration can be re-used.
7.18.17.1. About reclaiming statically provisioned persistent volumes
When you reclaim a persistent volume (PV), you unbind the PV from a persistent volume claim (PVC) and delete the PV. Depending on the underlying storage, you might need to manually delete the shared storage.
You can then re-use the PV configuration to create a PV with a different name.
Statically provisioned PVs must have a reclaim policy of Retain
to be reclaimed. If they do not, the PV enters a failed state when the PVC is unbound from the PV.
The Recycle
reclaim policy is deprecated in OpenShift Container Platform 4.
7.18.17.2. Reclaiming statically provisioned persistent volumes
Reclaim a statically provisioned persistent volume (PV) by unbinding the persistent volume claim (PVC) and deleting the PV. You might also need to manually delete the shared storage.
Reclaiming a statically provisioned PV is dependent on the underlying storage. This procedure provides a general approach that might need to be customized depending on your storage.
Procedure
Ensure that the reclaim policy of the PV is set to
Retain
:Check the reclaim policy of the PV:
$ oc get pv <pv_name> -o yaml | grep 'persistentVolumeReclaimPolicy'
If the
persistentVolumeReclaimPolicy
is not set toRetain
, edit the reclaim policy with the following command:$ oc patch pv <pv_name> -p '{"spec":{"persistentVolumeReclaimPolicy":"Retain"}}'
Ensure that no resources are using the PV:
$ oc describe pvc <pvc_name> | grep 'Mounted By:'
Remove any resources that use the PVC before continuing.
Delete the PVC to release the PV:
$ oc delete pvc <pvc_name>
Optional: Export the PV configuration to a YAML file. If you manually remove the shared storage later in this procedure, you can refer to this configuration. You can also use
spec
parameters in this file as the basis to create a new PV with the same storage configuration after you reclaim the PV:$ oc get pv <pv_name> -o yaml > <file_name>.yaml
Delete the PV:
$ oc delete pv <pv_name>
Optional: Depending on the storage type, you might need to remove the contents of the shared storage folder:
$ rm -rf <path_to_share_storage>
Optional: Create a PV that uses the same storage configuration as the deleted PV. If you exported the reclaimed PV configuration earlier, you can use the
spec
parameters of that file as the basis for a new PV manifest:NoteTo avoid possible conflict, it is good practice to give the new PV object a different name than the one that you deleted.
$ oc create -f <new_pv_name>.yaml
Additional resources
- Configuring local storage for virtual machines
- The OpenShift Container Platform Storage documentation has more information on Persistent Storage.
7.18.18. Deleting data volumes
You can manually delete a data volume by using the oc
command-line interface.
When you delete a virtual machine, the data volume it uses is automatically deleted.
7.18.18.1. About data volumes
DataVolume
objects are custom resources that are provided by the Containerized Data Importer (CDI) project. Data volumes orchestrate import, clone, and upload operations that are associated with an underlying persistent volume claim (PVC). Data volumes are integrated with OpenShift Virtualization, and they prevent a virtual machine from being started before the PVC has been prepared.
7.18.18.2. Listing all data volumes
You can list the data volumes in your cluster by using the oc
command-line interface.
Procedure
List all data volumes by running the following command:
$ oc get dvs
7.18.18.3. Deleting a data volume
You can delete a data volume by using the oc
command-line interface (CLI).
Prerequisites
- Identify the name of the data volume that you want to delete.
Procedure
Delete the data volume by running the following command:
$ oc delete dv <datavolume_name>
NoteThis command only deletes objects that exist in the current project. Specify the
-n <project_name>
option if the object you want to delete is in a different project or namespace.
Chapter 8. Virtual machine templates
8.1. Creating virtual machine templates
8.1.1. About virtual machine templates
Preconfigured Red Hat virtual machine templates are listed in the Templates tab within the Virtualization page. These templates are available for different versions of Red Hat Enterprise Linux, Fedora, Microsoft Windows 10, and Microsoft Windows Servers. Each Red Hat virtual machine template is preconfigured with the operating system image, default settings for the operating system, flavor (CPU and memory), and workload type (server).
The Templates tab displays four types of virtual machine templates:
- Red Hat Supported templates are fully supported by Red Hat.
- User Supported templates are Red Hat Supported templates that were cloned and created by users.
- Red Hat Provided templates have limited support from Red Hat.
- User Provided templates are Red Hat Provided templates that were cloned and created by users.
In the Templates tab, you cannot edit or delete Red Hat Supported or Red Hat Provided templates. You can only edit or delete custom virtual machine templates that were created by users.
Using a Red Hat template is convenient because the template is already preconfigured. When you select a Red Hat template to create your own custom template, the Create Virtual Machine Template wizard prompts you to add a boot source if a boot source was not added previously. Then, you can either save your custom template or continue to customize it and save it.
You can also select the Create Virtual Machine Template wizard directly and create a custom virtual machine template. The wizard prompts you to provide configuration details for the operating system, flavor, workload type, and other settings. You can add a boot source and continue to customize your template and save it.
8.1.2. Adding a boot source for a virtual machine template
A boot source can be configured for any virtual machine template that you want to use for creating virtual machines or custom templates. When virtual machine templates are configured with a boot source, they are labeled Available in the Templates tab. After you add a boot source to a template, you can create a new virtual machine from the template.
There are four methods for selecting and adding a boot source in the web console:
- Upload local file (creates PVC)
- Import via URL (creates PVC)
- Clone existing PVC (creates PVC)
- Import via Registry (creates PVC)
Prerequisites
-
To add a boot source, you must be logged in as a user with the
os-images.kubevirt.io:edit
RBAC role or as an administrator. You do not need special privileges to create a virtual machine from a template with a boot source added. - To upload a local file, the operating system image file must exist on your local machine.
- To import via URL, access to the web server with the operating system image is required. For example: the Red Hat Enterprise Linux web page with images.
- To clone an existing PVC, access to the project with a PVC is required.
- To import via registry, access to the container registry is required.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Templates tab.
- Identify the virtual machine template for which you want to configure a boot source and click Add source.
- In the Add boot source to template window, click Select boot source, select a method for creating a persistent volume claim (PVC): Upload local file, Import via URL, Clone existing PVC, or Import via Registry.
- Optional: Click This is a CD-ROM boot source to mount a CD-ROM and use it to install the operating system on to an empty disk. The additional empty disk is automatically created and mounted by OpenShift Virtualization. If the additional disk is not needed, you can remove it when you create the virtual machine.
Enter a value for Persistent Volume Claim size to specify the PVC size that is adequate for the uncompressed image and any additional space that is required.
- Optional: Enter a name for Source provider to associate the name with this template.
- Advanced: Click Storage class and select the storage class that is used to create the disk.
- Advanced: Click Access mode and select an access mode for the persistent volume. Supported access modes are: Single User (RWO), Shared Access (RWX), and Read Only (ROX).
- Advanced: Click Volume mode if you want to select Block instead of the default value Filesystem.
Select the appropriate method to save your boot source:
- Click Save and upload if you uploaded a local file.
- Click Save and import if you imported content from a URL or the registry.
- Click Save and clone if you cloned an existing PVC.
Your custom virtual machine template with a boot source is listed in the Templates tab, and you can create virtual machines by using this template.
8.1.2.1. Virtual machine template fields for adding a boot source
The following table describes the fields for Add boot source to template window. This window displays when you click Add Source for a virtual machine template in the Templates tab.
Name | Parameter | Description |
---|---|---|
Boot source type | Upload local file (creates PVC) | Upload a file from your local device. Supported file types include gz, xz, tar, and qcow2. |
Import via URL (creates PVC) | Import content from an image available from an HTTP or HTTPS endpoint. Obtain the download link URL from the web page where the image download is available and enter that URL link in the Import via URL (creates PVC) field. Example: For a Red Hat Enterprise Linux image, log on to the Red Hat Customer Portal, access the image download page, and copy the download link URL for the KVM guest image. | |
Clone existing PVC (creates PVC) | Use a PVC that is already available in the cluster and clone it. | |
Import via Registry (creates PVC) | Specify the bootable operating system container that is located in a registry and accessible from the cluster. Example: kubevirt/cirros-registry-dis-demo. | |
Source provider | Optional field. Add descriptive text about the source for the template or the name of the user who created the template. Example: Red Hat. | |
Advanced | Storage class | The storage class that is used to create the disk. |
Access mode |
Access mode of the persistent volume. Supported access modes are Single User (RWO), Shared Access (RWX), Read Only (ROX). If Single User (RWO) is selected, the disk can be mounted as read/write by a single node. If Shared Access (RWX) is selected, the disk can be mounted as read-write by many nodes. The + Note Shared Access (RWX) is required for some features, such as live migration of virtual machines between nodes. | |
Volume mode |
Defines whether the persistent volume uses a formatted file system or raw block state. Supported modes are Block and Filesystem. The |
8.1.3. Marking virtual machine templates as favorites
For easier access to virtual machine templates that are used frequently, you can mark those templates as favorites.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Templates tab.
- Identify the Red Hat template that you want to mark as a favorite.
- Click the Options menu and select Favorite template. The template moves up higher in the list of displayed templates.
8.1.4. Filtering the list of virtual machine templates by providers
In the Templates tab, you can use the Search by name field to search for virtual machine templates by specifying either the name of the template or a label that identfies the template. You can also filter templates by the provider, and display only those templates that meet your filtering criteria.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Templates tab.
- To filter templates, click Filter.
- Select the appropriate checkbox from the list to filter the templates: Red Hat Supported, User Supported, Red Hat Provided, and User Provided.
8.1.5. Creating a virtual machine template with the wizard in the web console
The web console features the Create Virtual Machine Template wizard that guides you through the General, Networking, Storage, Advanced, and Review steps to simplify the process of creating virtual machine templates. All required fields are marked with a *. The Create Virtual Machine Template wizard prevents you from moving to the next step until you provide values in the required fields.
The wizard guides you to create a custom virtual machine template where you specify the operating system, boot source, flavor, and other settings.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Templates tab.
- Click Create and select Template with Wizard.
- Fill in all required fields in the General step.
Click Next to progress to the Networking step. A NIC that is named
nic0
is attached by default.- Optional: Click Add Network Interface to create additional NICs.
- Optional: You can remove any or all NICs by clicking the Options menu and selecting Delete. Virtual machines created from a template do not need a NIC attached. NICs can be created after a virtual machine has been created.
- Click Next to progress to the Storage step.
Click Add Disk to add a disk, and complete your selections for the fields in the Add Disk screen.
NoteIf Import via URL (creates PVC), Import via Registry (creates PVC), or Container (ephemeral) is selected as Source, a
rootdisk
disk is created and attached to the virtual machine as the Bootable Disk.A Bootable Disk is not required for virtual machines provisioned from a PXE source if there are no disks attached to the virtual machine. If one or more disks are attached to the virtual machine, you must select one as the Bootable Disk.
Blank disks, PVC disks without a valid boot source, and the cloudinitdisk cannot be used as a boot source.
- Optional: Click Advanced to configure Cloud-init.
- Click Review to review and confirm your settings.
- Click Create Virtual Machine template.
- Click See virtual machine template details to view details about the virtual machine template.
The template is also listed in the Templates tab.
8.1.6. Virtual machine template wizard fields
The following tables describe the fields for the General, Networking, Storage, and Advanced steps in the Create Virtual Machine Template wizard.
8.1.6.1. Virtual machine template wizard fields
Name | Parameter | Description |
---|---|---|
Template | Template from which to create the virtual machine. Selecting a template will automatically complete other fields. | |
Name |
The name can contain lowercase letters ( | |
Template provider | The name of the user who is creating the template for the cluster or any meaningful name that identifies this template. | |
Template support | No additional support | This template does not have additional support in the cluster. |
Support by template provider | This template is supported by the template provider. | |
Description | Optional description field. | |
Operating System | The primary operating system that is selected for the virtual machine. Selecting an operating system automatically selects the default Flavor and Workload Type for that operating system. | |
Boot Source | Import via URL (creates PVC) | Import content from an image available from an HTTP or HTTPS endpoint. Example: Obtaining a URL link from the web page with the operating system image. |
Clone existing PVC (creates PVC) | Select an existent persistent volume claim available on the cluster and clone it. | |
Import via Registry (creates PVC) |
Provision virtual machine from a bootable operating system container located in a registry accessible from the cluster. Example: | |
PXE (network boot - adds network interface) | Boot an operating system from a server on the network. Requires a PXE bootable network attachment definition. | |
Persistent Volume Claim project | Project name that you want to use for cloning the PVC. | |
Persistent Volume Claim name | PVC name that should apply to this virtual machine template if you are cloning an existing PVC. | |
Mount this as a CD-ROM boot source | A CD-ROM requires an additional disk for installing the operating system. Select the checkbox to add a disk and customize it later. | |
Flavor | Tiny, Small, Medium, Large, Custom | Presets that determine the amount of CPU and memory allocated to the virtual machine. The presets displayed for Flavor are determined by the operating system. |
Workload Type | Desktop | A virtual machine configuration for use on a desktop. Ideal for consumption on a small scale. Recommended for use with the web console. |
Server | Balances performance and it is compatible with a wide range of server workloads. | |
High-Performance | A virtual machine configuration that is optimized for high-performance workloads. |
8.1.6.2. Networking fields
Name | Description |
---|---|
Name | Name for the network interface controller. |
Model | Indicates the model of the network interface controller. Supported values are e1000e and virtio. |
Network | List of available network attachment definitions. |
Type |
List of available binding methods. For the default pod network, |
MAC Address | MAC address for the network interface controller. If a MAC address is not specified, one is assigned automatically. |
8.1.6.3. Storage fields
Name | Selection | Description |
---|---|---|
Source | Blank (creates PVC) | Create an empty disk. |
Import via URL (creates PVC) | Import content via URL (HTTP or HTTPS endpoint). | |
Use an existing PVC | Use a PVC that is already available in the cluster. | |
Clone existing PVC (creates PVC) | Select an existing PVC available in the cluster and clone it. | |
Import via Registry (creates PVC) | Import content via container registry. | |
Container (ephemeral) | Upload content from a container located in a registry accessible from the cluster. The container disk should be used only for read-only filesystems such as CD-ROMs or temporary virtual machines. | |
Name |
Name of the disk. The name can contain lowercase letters ( | |
Size | Size of the disk in GiB. | |
Type | Type of disk. Example: Disk or CD-ROM | |
Interface | Type of disk device. Supported interfaces are virtIO, SATA, and SCSI. | |
Storage Class | The storage class that is used to create the disk. | |
Advanced → Volume Mode | Defines whether the persistent volume uses a formatted file system or raw block state. Default is Filesystem. | |
Advanced → Access Mode | Access mode of the persistent volume. Supported access modes are Single User (RWO), Shared Access (RWX), and Read Only (ROX). |
Advanced storage settings
The following advanced storage settings are available for Blank, Import via URL, and Clone existing PVC disks. These parameters are optional. If you do not specify these parameters, the system uses the default values from the kubevirt-storage-class-defaults
config map.
Name | Parameter | Description |
---|---|---|
Volume Mode | Filesystem | Stores the virtual disk on a file system-based volume. |
Block |
Stores the virtual disk directly on the block volume. Only use | |
Access Mode | Single User (RWO) | The disk can be mounted as read/write by a single node. |
Shared Access (RWX) | The disk can be mounted as read/write by many nodes. Note This is required for some features, such as live migration of virtual machines between nodes. | |
Read Only (ROX) | The disk can be mounted as read-only by many nodes. |
8.1.6.4. Cloud-init fields
Name | Description |
---|---|
Hostname | Sets a specific hostname for the virtual machine. |
Authorized SSH Keys | The user’s public key that is copied to ~/.ssh/authorized_keys on the virtual machine. |
Custom script | Replaces other options with a field in which you paste a custom cloud-init script. |
8.1.7. Additional Resources
- See Configuring the SR-IOV Network Operator for further details on the SR-IOV Network Operator.
8.2. Editing virtual machine templates
You can update a virtual machine template in the web console, either by editing the full configuration in the YAML editor or by selecting a custom template in the Templates tab and modifying the editable items.
8.2.1. Editing a virtual machine template in the web console
Edit select values of a virtual machine template in the web console by clicking the pencil icon next to the relevant field. Other values can be edited using the CLI.
Labels and annotations are editable for both preconfigured Red Hat templates and your custom virtual machine templates. All other values are editable only for custom virtual machine templates that users have created using the Red Hat templates or the Create Virtual Machine Template wizard.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Templates tab.
- Select a virtual machine template.
- Click the VM Template Details tab.
- Click the pencil icon to make a field editable.
- Make the relevant changes and click Save.
Editing a virtual machine template will not affect virtual machines already created from that template.
8.2.2. Editing virtual machine template YAML configuration in the web console
You can edit the YAML configuration of a virtual machine template from the web console.
Some parameters cannot be modified. If you click Save with an invalid configuration, an error message indicates the parameter that cannot be modified.
Navigating away from the YAML screen while editing cancels any changes to the configuration that you made.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Templates tab.
- Select a template to open the VM Template Details screen.
- Click the YAML tab to display the editable configuration.
- Edit the file and click Save.
A confirmation message, which includes the updated version number for the object, shows that the YAML configuration was successfully edited.
8.2.3. Adding a virtual disk to a virtual machine template
Use this procedure to add a virtual disk to a virtual machine template.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Templates tab.
- Select a virtual machine template to open the VM Template Details screen.
- Click the Disks tab.
In the Add Disk window, specify the Source, Name, Size, Type, Interface, and Storage Class.
-
Optional: In the Advanced list, specify the Volume Mode and Access Mode for the virtual disk. If you do not specify these parameters, the system uses the default values from the
kubevirt-storage-class-defaults
config map.
-
Optional: In the Advanced list, specify the Volume Mode and Access Mode for the virtual disk. If you do not specify these parameters, the system uses the default values from the
- Click Add.
8.2.4. Adding a network interface to a virtual machine template
Use this procedure to add a network interface to a virtual machine template.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Templates tab.
- Select a virtual machine template to open the VM Template Details screen.
- Click the Network Interfaces tab.
- Click Add Network Interface.
- In the Add Network Interface window, specify the Name, Model, Network, Type, and MAC Address of the network interface.
- Click Add.
8.2.5. Editing CD-ROMs for Templates
Use the following procedure to edit CD-ROMs for virtual machine templates.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Templates tab.
- Select a virtual machine template to open the VM Template Details screen.
- Click the Disks tab.
- Click the Options menu for the CD-ROM that you want to edit and select Edit.
- In the Edit CD-ROM window, edit the fields: Source, Persistent Volume Claim, Name, Type, and Interface.
- Click Save.
8.3. Enabling dedicated resources for virtual machine templates
Virtual machines can have resources of a node, such as CPU, dedicated to them to improve performance.
8.3.1. About dedicated resources
When you enable dedicated resources for your virtual machine, your virtual machine’s workload is scheduled on CPUs that will not be used by other processes. By using dedicated resources, you can improve the performance of the virtual machine and the accuracy of latency predictions.
8.3.2. Prerequisites
-
The CPU Manager must be configured on the node. Verify that the node has the
cpumanager
=true
label before scheduling virtual machine workloads.
8.3.3. Enabling dedicated resources for a virtual machine template
You can enable dedicated resources for a virtual machine template in the Details tab. Virtual machines that were created by using a Red Hat template or the wizard can be enabled with dedicated resources.
Procedure
- Click Workloads → Virtual Machine Templates from the side menu.
- Select a virtual machine template to open the Virtual Machine Template tab.
- Click the Details tab.
- Click the pencil icon to the right of the Dedicated Resources field to open the Dedicated Resources window.
- Select Schedule this workload with dedicated resources (guaranteed policy).
- Click Save.
8.4. Deleting a virtual machine template
Red Hat virtual machine templates cannot be deleted. You can use the web console to delete:
- Virtual machine templates created from Red Hat templates
- Custom virtual machine templates that were created by using the Create Virtual Machine Template wizard.
8.4.1. Deleting a virtual machine template in the web console
Deleting a virtual machine template permanently removes it from the cluster.
You can delete virtual machine templates that were created by using a Red Hat template or the Create Virtual Machine Template wizard. Preconfigured virtual machine templates that are provided by Red Hat cannot be deleted.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
Click the Templates tab. Select the appropriate method to delete a virtual machine template:
- Click the Options menu of the template to delete and select Delete Template.
- Click the template name to open the Virtual Machine Template Details screen and click Actions → Delete Template.
- In the confirmation pop-up window, click Delete to permanently delete the template.
Chapter 9. Live migration
9.1. Virtual machine live migration
9.1.1. Understanding live migration
Live migration is the process of moving a running virtual machine instance (VMI) to another node in the cluster without interrupting the virtual workload or access. If a VMI uses the LiveMigrate
eviction strategy, it automatically migrates when the node that the VMI runs on is placed into maintenance mode. You can also manually start live migration by selecting a VMI to migrate.
Virtual machines must have a persistent volume claim (PVC) with a shared ReadWriteMany (RWX) access mode to be live migrated.
Live migration is not supported for virtual machines that are attached to an SR-IOV network interface.
9.1.2. Updating access mode for live migration
For live migration to function properly, you must use the ReadWriteMany (RWX) access mode. Use this procedure to update the access mode, if needed.
Procedure
To set the RWX access mode, run the following
oc patch
command:$ oc patch -n openshift-cnv \ cm kubevirt-storage-class-defaults \ -p '{"data":{"'$<STORAGE_CLASS>'.accessMode":"ReadWriteMany"}}'
9.2. Live migration limits and timeouts
Live migration limits and timeouts are applied so that migration processes do not overwhelm the cluster. Configure these settings by editing the kubevirt-config
configuration file.
9.2.1. Configuring live migration limits and timeouts
Configure live migration limits and timeouts for the cluster by adding updated key:value fields to the kubevirt-config
configuration file, which is located in the openshift-cnv
namespace.
Procedure
Edit the
kubevirt-config
configuration file and add the necessary live migration parameters. The following example shows the default values:$ oc edit configmap kubevirt-config -n openshift-cnv
Example configuration file
apiVersion: v1 data: default-network-interface: masquerade feature-gates: DataVolumes,SRIOV,LiveMigration,CPUManager,CPUNodeDiscovery,Sidecar,Snapshot migrations: |- parallelMigrationsPerCluster: "5" parallelOutboundMigrationsPerNode: "2" bandwidthPerMigration: "64Mi" completionTimeoutPerGiB: "800" progressTimeout: "150" machine-type: pc-q35-rhel8.3.0 selinuxLauncherType: virt_launcher.process smbios: |- Family: Red Hat Product: Container-native virtualization Manufacturer: Red Hat Sku: 2.6.0 Version: 2.6.0 kind: ConfigMap metadata: creationTimestamp: "2021-03-26T18:01:04Z" labels: app: kubevirt-hyperconverged name: kubevirt-config namespace: openshift-cnv resourceVersion: "15371295" selfLink: /api/v1/namespaces/openshift-cnv/configmaps/kubevirt-config uid: <uuid>
9.2.2. Cluster-wide live migration limits and timeouts
Parameter | Description | Default |
---|---|---|
| Number of migrations running in parallel in the cluster. | 5 |
| Maximum number of outbound migrations per node. | 2 |
| Bandwidth limit of each migration, in MiB/s. | 64Mi |
|
The migration is canceled if it has not completed in this time, in seconds per GiB of memory. For example, a virtual machine instance with 6GiB memory times out if it has not completed migration in 4800 seconds. If the | 800 |
| The migration is canceled if memory copy fails to make progress in this time, in seconds. | 150 |
9.3. Migrating a virtual machine instance to another node
Manually initiate a live migration of a virtual machine instance to another node using either the web console or the CLI.
9.3.1. Initiating live migration of a virtual machine instance in the web console
Migrate a running virtual machine instance to a different node in the cluster.
The Migrate Virtual Machine action is visible to all users but only admin users can initiate a virtual machine migration.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
You can initiate the migration from this screen, which makes it easier to perform actions on multiple virtual machines in the one screen, or from the Virtual Machine Overview screen where you can view comprehensive details of the selected virtual machine:
- Click the Options menu at the end of virtual machine and select Migrate Virtual Machine.
- Click the virtual machine name to open the Virtual Machine Overview screen and click Actions → Migrate Virtual Machine.
- Click Migrate to migrate the virtual machine to another node.
9.3.2. Initiating live migration of a virtual machine instance in the CLI
Initiate a live migration of a running virtual machine instance by creating a VirtualMachineInstanceMigration
object in the cluster and referencing the name of the virtual machine instance.
Procedure
Create a
VirtualMachineInstanceMigration
configuration file for the virtual machine instance to migrate. For example,vmi-migrate.yaml
:apiVersion: kubevirt.io/v1alpha3 kind: VirtualMachineInstanceMigration metadata: name: migration-job spec: vmiName: vmi-fedora
Create the object in the cluster by running the following command:
$ oc create -f vmi-migrate.yaml
The VirtualMachineInstanceMigration
object triggers a live migration of the virtual machine instance. This object exists in the cluster for as long as the virtual machine instance is running, unless manually deleted.
9.4. Monitoring live migration of a virtual machine instance
You can monitor the progress of a live migration of a virtual machine instance from either the web console or the CLI.
9.4.1. Monitoring live migration of a virtual machine instance in the web console
For the duration of the migration, the virtual machine has a status of Migrating. This status is displayed in the Virtual Machines tab or in the Virtual Machine Overview screen for the migrating virtual machine.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
9.4.2. Monitoring live migration of a virtual machine instance in the CLI
The status of the virtual machine migration is stored in the Status
component of the VirtualMachineInstance
configuration.
Procedure
Use the
oc describe
command on the migrating virtual machine instance:$ oc describe vmi vmi-fedora
Example output
... Status: Conditions: Last Probe Time: <nil> Last Transition Time: <nil> Status: True Type: LiveMigratable Migration Method: LiveMigration Migration State: Completed: true End Timestamp: 2018-12-24T06:19:42Z Migration UID: d78c8962-0743-11e9-a540-fa163e0c69f1 Source Node: node2.example.com Start Timestamp: 2018-12-24T06:19:35Z Target Node: node1.example.com Target Node Address: 10.9.0.18:43891 Target Node Domain Detected: true
9.5. Cancelling the live migration of a virtual machine instance
Cancel the live migration so that the virtual machine instance remains on the original node.
You can cancel a live migration from either the web console or the CLI.
9.5.1. Cancelling live migration of a virtual machine instance in the web console
You can cancel a live migration of the virtual machine instance using the Options menu found on each virtual machine in the Virtualization → Virtual Machines tab, or from the Actions menu available on all tabs in the Virtual Machine Overview screen.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
You can cancel the migration from this screen, which makes it easier to perform actions on multiple virtual machines, or from the Virtual Machine Overview screen where you can view comprehensive details of the selected virtual machine:
- Click the Options menu at the end of virtual machine and select Cancel Virtual Machine Migration.
- Select a virtual machine name to open the Virtual Machine Overview screen and click Actions → Cancel Virtual Machine Migration.
- Click Cancel Migration to cancel the virtual machine live migration.
9.5.2. Cancelling live migration of a virtual machine instance in the CLI
Cancel the live migration of a virtual machine instance by deleting the VirtualMachineInstanceMigration
object associated with the migration.
Procedure
Delete the
VirtualMachineInstanceMigration
object that triggered the live migration,migration-job
in this example:$ oc delete vmim migration-job
9.6. Configuring virtual machine eviction strategy
The LiveMigrate
eviction strategy ensures that a virtual machine instance is not interrupted if the node is placed into maintenance or drained. Virtual machines instances with this eviction strategy will be live migrated to another node.
9.6.1. Configuring custom virtual machines with the LiveMigration eviction strategy
You only need to configure the LiveMigration
eviction strategy on custom virtual machines. Common templates have this eviction strategy configured by default.
Procedure
Add the
evictionStrategy: LiveMigrate
option to thespec.template.spec
section in the virtual machine configuration file. This example usesoc edit
to update the relevant snippet of theVirtualMachine
configuration file:$ oc edit vm <custom-vm> -n <my-namespace>
apiVersion: kubevirt.io/v1alpha3 kind: VirtualMachine metadata: name: custom-vm spec: template: spec: evictionStrategy: LiveMigrate ...
Restart the virtual machine for the update to take effect:
$ virtctl restart <custom-vm> -n <my-namespace>
Chapter 10. Node maintenance
10.1. About node maintenance
10.1.1. Understanding node maintenance mode
Nodes can be placed into maintenance mode using the oc adm
utility, or using NodeMaintenance
custom resources (CRs).
Placing a node into maintenance marks the node as unschedulable and drains all the virtual machines and pods from it. Virtual machine instances that have a LiveMigrate
eviction strategy are live migrated to another node without loss of service. This eviction strategy is configured by default in virtual machine created from common templates but must be configured manually for custom virtual machines.
Virtual machine instances without an eviction strategy are shut down. Virtual machines with a RunStrategy
of Running
or RerunOnFailure
are recreated on another node. Virtual machines with a RunStrategy
of Manual
are not automatically restarted.
Virtual machines must have a persistent volume claim (PVC) with a shared ReadWriteMany
(RWX) access mode to be live migrated.
When installed as part of OpenShift Virtualization, Node Maintenance Operator watches for new or deleted NodeMaintenance
CRs. When a new NodeMaintenance
CR is detected, no new workloads are scheduled and the node is cordoned off from the rest of the cluster. All pods that can be evicted are evicted from the node. When a NodeMaintenance
CR is deleted, the node that is referenced in the CR is made available for new workloads.
Using a NodeMaintenance
CR for node maintenance tasks achieves the same results as the oc adm cordon
and oc adm drain
commands using standard OpenShift Container Platform custom resource processing.
10.1.2. Maintaining bare metal nodes
When you deploy OpenShift Container Platform on bare metal infrastructure, there are additional considerations that must be taken into account compared to deploying on cloud infrastructure. Unlike in cloud environments where the cluster nodes are considered ephemeral, re-provisioning a bare metal node requires significantly more time and effort for maintenance tasks.
When a bare metal node fails, for example, if a fatal kernel error happens or a NIC card hardware failure occurs, workloads on the failed node need to be restarted elsewhere else on the cluster while the problem node is repaired or replaced. Node maintenance mode allows cluster administrators to gracefully power down nodes, moving workloads to other parts of the cluster and ensuring workloads do not get interrupted. Detailed progress and node status details are provided during maintenance.
10.2. Setting a node to maintenance mode
Place a node into maintenance from the web console, CLI, or using a NodeMaintenance
custom resource.
10.2.1. Setting a node to maintenance mode in the web console
Set a node to maintenance mode using the Options menu found on each node in the Compute → Nodes list, or using the Actions control of the Node Details screen.
Procedure
- In the OpenShift Virtualization console, click Compute → Nodes.
You can set the node to maintenance from this screen, which makes it easier to perform actions on multiple nodes in the one screen or from the Node Details screen where you can view comprehensive details of the selected node:
- Click the Options menu at the end of the node and select Start Maintenance.
- Click the node name to open the Node Details screen and click Actions → Start Maintenance.
- Click Start Maintenance in the confirmation window.
The node will live migrate virtual machine instances that have the LiveMigration
eviction strategy, and the node is no longer schedulable. All other pods and virtual machines on the node are deleted and recreated on another node.
10.2.2. Setting a node to maintenance mode in the CLI
Set a node to maintenance mode by marking it as unschedulable and using the oc adm drain
command to evict or delete pods from the node.
Procedure
Mark the node as unschedulable. The node status changes to
NotReady,SchedulingDisabled
.$ oc adm cordon <node1>
Drain the node in preparation for maintenance. The node live migrates virtual machine instances that have the
LiveMigratable
condition set toTrue
and thespec:evictionStrategy
field set toLiveMigrate
. All other pods and virtual machines on the node are deleted and recreated on another node.$ oc adm drain <node1> --delete-emptydir-data --ignore-daemonsets=true --force
-
The
--delete-emptydir-data
flag removes any virtual machine instances on the node that useemptyDir
volumes. Data in these volumes is ephemeral and is safe to be deleted after termination. -
The
--ignore-daemonsets=true
flag ensures that daemon sets are ignored and pod eviction can continue successfully. -
The
--force
flag is required to delete pods that are not managed by a replica set or daemon set controller.
-
The
10.2.3. Setting a node to maintenance mode with a NodeMaintenance custom resource
You can put a node into maintenance mode with a NodeMaintenance
custom resource (CR). When you apply a NodeMaintenance
CR, all allowed pods are evicted and the node is shut down. Evicted pods are queued to be moved to another node in the cluster.
Prerequisites
-
Install the OpenShift Container Platform CLI
oc
. -
Log in to the cluster as a user with
cluster-admin
privileges.
Procedure
Create the following node maintenance CR, and save the file as
nodemaintenance-cr.yaml
:apiVersion: nodemaintenance.kubevirt.io/v1beta1 kind: NodeMaintenance metadata: name: maintenance-example 1 spec: nodeName: node-1.example.com 2 reason: "Node maintenance" 3
Apply the node maintenance schedule by running the following command:
$ oc apply -f nodemaintenance-cr.yaml
Check the progress of the maintenance task by running the following command, replacing
<node-name>
with the name of your node:$ oc describe node <node-name>
Example output
Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal NodeNotSchedulable 61m kubelet Node node-1.example.com status is now: NodeNotSchedulable
10.2.3.1. Checking status of current NodeMaintenance CR tasks
You can check the status of current NodeMaintenance
CR tasks.
Prerequisites
-
Install the OpenShift Container Platform CLI
oc
. -
Log in as a user with
cluster-admin
privileges.
Procedure
Check the status of current node maintenance tasks by running the following command:
$ oc get NodeMaintenance -o yaml
Example output
apiVersion: v1 items: - apiVersion: nodemaintenance.kubevirt.io/v1beta1 kind: NodeMaintenance metadata: ... spec: nodeName: node-1.example.com reason: Node maintenance status: evictionPods: 3 1 pendingPods: - pod-example-workload-0 - httpd - httpd-manual phase: Running lastError: "Last failure message" 2 totalpods: 5 ...
10.3. Resuming a node from maintenance mode
Resuming a node brings it out of maintenance mode and makes it schedulable again.
Resume a node from maintenance mode from the web console, CLI, or by deleting the NodeMaintenance
custom resource.
10.3.1. Resuming a node from maintenance mode in the web console
Resume a node from maintenance mode using the Options menu found on each node in the Compute → Nodes list, or using the Actions control of the Node Details screen.
Procedure
- In the OpenShift Virtualization console, click Compute → Nodes.
You can resume the node from this screen, which makes it easier to perform actions on multiple nodes in the one screen, or from the Node Details screen where you can view comprehensive details of the selected node:
- Click the Options menu at the end of the node and select Stop Maintenance.
- Click the node name to open the Node Details screen and click Actions → Stop Maintenance.
- Click Stop Maintenance in the confirmation window.
The node becomes schedulable, but virtual machine instances that were running on the node prior to maintenance will not automatically migrate back to this node.
10.3.2. Resuming a node from maintenance mode in the CLI
Resume a node from maintenance mode by making it schedulable again.
Procedure
Mark the node as schedulable. You can then resume scheduling new workloads on the node.
$ oc adm uncordon <node1>
10.3.3. Resuming a node from maintenance mode that was initiated with a NodeMaintenance CR
You can resume a node by deleting the NodeMaintenance
CR.
Prerequisites
-
Install the OpenShift Container Platform CLI
oc
. -
Log in to the cluster as a user with
cluster-admin
privileges.
Procedure
When your node maintenance task is complete, delete the active
NodeMaintenance
CR:$ oc delete -f nodemaintenance-cr.yaml
Example output
nodemaintenance.nodemaintenance.kubevirt.io "maintenance-example" deleted
10.4. Automatic renewal of TLS certificates
All TLS certificates for OpenShift Virtualization components are renewed and rotated automatically. You are not required to refresh them manually.
10.4.1. TLS certificates automatic renewal schedules
TLS certificates are automatically deleted and replaced according to the following schedule:
- KubeVirt certificates are renewed daily.
- Containerized Data Importer controller (CDI) certificates are renewed every 15 days.
- MAC pool certificates are renewed every year.
Automatic TLS certificate rotation does not disrupt any operations. For example, the following operations continue to function without any disruption:
- Migrations
- Image uploads
- VNC and console connections
10.5. Managing node labeling for obsolete CPU models
You can schedule a virtual machine (VM) on a node where the CPU model and policy attribute of the VM are compatible with the CPU models and policy attributes that the node supports. By specifying a list of obsolete CPU models in a config map, you can exclude them from the list of labels created for CPU models.
10.5.1. Understanding node labeling for obsolete CPU models
To ensure that a node supports only valid CPU models for scheduled VMs, create a config map with a list of obsolete CPU models. When the node-labeller
obtains the list of obsolete CPU models, it eliminates those CPU models and creates labels for valid CPU models.
If you do not configure a config map with a list of obsolete CPU models, all CPU models are evaluated for labels, including obsolete CPU models that are not present in your environment.
Through the process of iteration, the list of base CPU features in the minimum CPU model are eliminated from the list of labels generated for the node. For example, an environment might have two supported CPU models: Penryn
and Haswell
.
If Penryn
is specified as the CPU model for minCPU
, the node-labeller
evaluates each base CPU feature for Penryn
and compares it with each CPU feature supported by Haswell
. If the CPU feature is supported by both Penryn
and Haswell
, the node-labeller
eliminates that feature from the list of CPU features for creating labels. If a CPU feature is supported only by Haswell
and not by Penryn
, that CPU feature is included in the list of generated labels. The node-labeller
follows this iterative process to eliminate base CPU features that are present in the minimum CPU model and create labels.
The following example shows the complete list of CPU features for Penryn
which is specified as the CPU model for minCPU
:
Example of CPU features for Penryn
apic clflush cmov cx16 cx8 de fpu fxsr lahf_lm lm mca mce mmx msr mtrr nx pae pat pge pni pse pse36 sep sse sse2 sse4.1 ssse3 syscall tsc
The following example shows the complete list of CPU features for Haswell
:
Example of CPU features for Haswell
aes apic avx avx2 bmi1 bmi2 clflush cmov cx16 cx8 de erms fma fpu fsgsbase fxsr hle invpcid lahf_lm lm mca mce mmx movbe msr mtrr nx pae pat pcid pclmuldq pge pni popcnt pse pse36 rdtscp rtm sep smep sse sse2 sse4.1 sse4.2 ssse3 syscall tsc tsc-deadline x2apic xsave
The following example shows the list of node labels generated by the node-labeller
after iterating and comparing the CPU features for Penryn
with the CPU features for Haswell
:
Example of node labels after iteration
aes avx avx2 bmi1 bmi2 erms fma fsgsbase hle invpcid movbe pcid pclmuldq popcnt rdtscp rtm sse4.2 tsc-deadline x2apic xsave
10.5.2. Configuring a config map for obsolete CPU models
Use this procedure to configure a config map for obsolete CPU models.
Procedure
Create a
ConfigMap
object, specifying the obsolete CPU models in theobsoleteCPUs
array. For example:apiVersion: v1 kind: ConfigMap metadata: name: cpu-plugin-configmap 1 data: 2 cpu-plugin-configmap: obsoleteCPUs: 3 - "486" - "pentium" - "pentium2" - "pentium3" - "pentiumpro" minCPU: "Penryn" 4
Chapter 11. Node networking
11.1. Observing node network state
Node network state is the network configuration for all nodes in the cluster.
11.1.1. About nmstate
OpenShift Virtualization uses nmstate
to report on and configure the state of the node network. This makes it possible to modify network policy configuration, such as by creating a Linux bridge on all nodes, by applying a single configuration manifest to the cluster.
Node networking is monitored and updated by the following objects:
NodeNetworkState
- Reports the state of the network on that node.
NodeNetworkConfigurationPolicy
-
Describes the requested network configuration on nodes. You update the node network configuration, including adding and removing interfaces, by applying a
NodeNetworkConfigurationPolicy
manifest to the cluster. NodeNetworkConfigurationEnactment
- Reports the network policies enacted upon each node.
OpenShift Virtualization supports the use of the following nmstate interface types:
- Linux Bridge
- VLAN
- Bond
- Ethernet
If your OpenShift Container Platform cluster uses OVN-Kubernetes as the default Container Network Interface (CNI) provider, you cannot attach a Linux bridge or bonding to the default interface of a host because of a change in the host network topology of OVN-Kubernetes. As a workaround, you can use a secondary network interface connected to your host, or switch to the OpenShift SDN default CNI provider.
11.1.2. Viewing the network state of a node
A NodeNetworkState
object exists on every node in the cluster. This object is periodically updated and captures the state of the network for that node.
Procedure
List all the
NodeNetworkState
objects in the cluster:$ oc get nns
Inspect a
NodeNetworkState
object to view the network on that node. The output in this example has been redacted for clarity:$ oc get nns node01 -o yaml
Example output
apiVersion: nmstate.io/v1beta1 kind: NodeNetworkState metadata: name: node01 1 status: currentState: 2 dns-resolver: ... interfaces: ... route-rules: ... routes: ... lastSuccessfulUpdateTime: "2020-01-31T12:14:00Z" 3
- 1
- The name of the
NodeNetworkState
object is taken from the node. - 2
- The
currentState
contains the complete network configuration for the node, including DNS, interfaces, and routes. - 3
- Timestamp of the last successful update. This is updated periodically as long as the node is reachable and can be used to evalute the freshness of the report.
11.2. Updating node network configuration
You can update the node network configuration, such as adding or removing interfaces from nodes, by applying NodeNetworkConfigurationPolicy
manifests to the cluster.
11.2.1. About nmstate
OpenShift Virtualization uses nmstate
to report on and configure the state of the node network. This makes it possible to modify network policy configuration, such as by creating a Linux bridge on all nodes, by applying a single configuration manifest to the cluster.
Node networking is monitored and updated by the following objects:
NodeNetworkState
- Reports the state of the network on that node.
NodeNetworkConfigurationPolicy
-
Describes the requested network configuration on nodes. You update the node network configuration, including adding and removing interfaces, by applying a
NodeNetworkConfigurationPolicy
manifest to the cluster. NodeNetworkConfigurationEnactment
- Reports the network policies enacted upon each node.
OpenShift Virtualization supports the use of the following nmstate interface types:
- Linux Bridge
- VLAN
- Bond
- Ethernet
If your OpenShift Container Platform cluster uses OVN-Kubernetes as the default Container Network Interface (CNI) provider, you cannot attach a Linux bridge or bonding to the default interface of a host because of a change in the host network topology of OVN-Kubernetes. As a workaround, you can use a secondary network interface connected to your host, or switch to the OpenShift SDN default CNI provider.
11.2.2. Creating an interface on nodes
Create an interface on nodes in the cluster by applying a NodeNetworkConfigurationPolicy
manifest to the cluster. The manifest details the requested configuration for the interface.
By default, the manifest applies to all nodes in the cluster. To add the interface to specific nodes, add the spec: nodeSelector
parameter and the appropriate <key>:<value>
for your node selector.
Procedure
Create the
NodeNetworkConfigurationPolicy
manifest. The following example configures a Linux bridge on all worker nodes:apiVersion: nmstate.io/v1beta1 kind: NodeNetworkConfigurationPolicy metadata: name: <br1-eth1-policy> 1 spec: nodeSelector: 2 node-role.kubernetes.io/worker: "" 3 desiredState: interfaces: - name: br1 description: Linux bridge with eth1 as a port 4 type: linux-bridge state: up ipv4: dhcp: true enabled: true bridge: options: stp: enabled: false port: - name: eth1
- 1
- Name of the policy.
- 2
- Optional: If you do not include the
nodeSelector
parameter, the policy applies to all nodes in the cluster. - 3
- This example uses the
node-role.kubernetes.io/worker: ""
node selector to select all worker nodes in the cluster. - 4
- Optional: Human-readable description for the interface.
Create the node network policy:
$ oc apply -f <br1-eth1-policy.yaml> 1
- 1
- File name of the node network configuration policy manifest.
Additional resources
11.2.3. Confirming node network policy updates on nodes
A NodeNetworkConfigurationPolicy
manifest describes your requested network configuration for nodes in the cluster. The node network policy includes your requested network configuration and the status of execution of the policy on the cluster as a whole.
When you apply a node network policy, a NodeNetworkConfigurationEnactment
object is created for every node in the cluster. The node network configuration enactment is a read-only object that represents the status of execution of the policy on that node. If the policy fails to be applied on the node, the enactment for that node includes a traceback for troubleshooting.
Procedure
To confirm that a policy has been applied to the cluster, list the policies and their status:
$ oc get nncp
Optional: If a policy is taking longer than expected to successfully configure, you can inspect the requested state and status conditions of a particular policy:
$ oc get nncp <policy> -o yaml
Optional: If a policy is taking longer than expected to successfully configure on all nodes, you can list the status of the enactments on the cluster:
$ oc get nnce
Optional: To view the configuration of a particular enactment, including any error reporting for a failed configuration:
$ oc get nnce <node>.<policy> -o yaml
11.2.4. Removing an interface from nodes
You can remove an interface from one or more nodes in the cluster by editing the NodeNetworkConfigurationPolicy
object and setting the state
of the interface to absent
.
Removing an interface from a node does not automatically restore the node network configuration to a previous state. If you want to restore the previous state, you will need to define that node network configuration in the policy.
If you remove a bridge or bonding interface, any node NICs in the cluster that were previously attached or subordinate to that bridge or bonding interface are placed in a down
state and become unreachable. To avoid losing connectivity, configure the node NIC in the same policy so that it has a status of up
and either DHCP or a static IP address.
Deleting the node network policy that added an interface does not change the configuration of the policy on the node. Although a NodeNetworkConfigurationPolicy
is an object in the cluster, it only represents the requested configuration.
Similarly, removing an interface does not delete the policy.
Procedure
Update the
NodeNetworkConfigurationPolicy
manifest used to create the interface. The following example removes a Linux bridge and configures theeth1
NIC with DHCP to avoid losing connectivity:apiVersion: nmstate.io/v1beta1 kind: NodeNetworkConfigurationPolicy metadata: name: <br1-eth1-policy> 1 spec: nodeSelector: 2 node-role.kubernetes.io/worker: "" 3 desiredState: interfaces: - name: br1 type: linux-bridge state: absent 4 - name: eth1 5 type: ethernet 6 state: up 7 ipv4: dhcp: true 8 enabled: true 9
- 1
- Name of the policy.
- 2
- Optional: If you do not include the
nodeSelector
parameter, the policy applies to all nodes in the cluster. - 3
- This example uses the
node-role.kubernetes.io/worker: ""
node selector to select all worker nodes in the cluster. - 4
- Changing the state to
absent
removes the interface. - 5
- The name of the interface that is to be unattached from the bridge interface.
- 6
- The type of interface. This example creates an Ethernet networking interface.
- 7
- The requested state for the interface.
- 8
- Optional: If you do not use
dhcp
, you can either set a static IP or leave the interface without an IP address. - 9
- Enables
ipv4
in this example.
Update the policy on the node and remove the interface:
$ oc apply -f <br1-eth1-policy.yaml> 1
- 1
- File name of the policy manifest.
11.2.5. Example policy configurations for different interfaces
11.2.5.1. Example: Linux bridge interface node network configuration policy
Create a Linux bridge interface on nodes in the cluster by applying a NodeNetworkConfigurationPolicy
manifest to the cluster.
The following YAML file is an example of a manifest for a Linux bridge interface. It includes samples values that you must replace with your own information.
apiVersion: nmstate.io/v1beta1 kind: NodeNetworkConfigurationPolicy metadata: name: br1-eth1-policy 1 spec: nodeSelector: 2 kubernetes.io/hostname: <node01> 3 desiredState: interfaces: - name: br1 4 description: Linux bridge with eth1 as a port 5 type: linux-bridge 6 state: up 7 ipv4: dhcp: true 8 enabled: true 9 bridge: options: stp: enabled: false 10 port: - name: eth1 11
- 1
- Name of the policy.
- 2
- Optional: If you do not include the
nodeSelector
parameter, the policy applies to all nodes in the cluster. - 3
- This example uses a
hostname
node selector. - 4
- Name of the interface.
- 5
- Optional: Human-readable description of the interface.
- 6
- The type of interface. This example creates a bridge.
- 7
- The requested state for the interface after creation.
- 8
- Optional: If you do not use
dhcp
, you can either set a static IP or leave the interface without an IP address. - 9
- Enables
ipv4
in this example. - 10
- Disables
stp
in this example. - 11
- The node NIC to which the bridge attaches.
11.2.5.2. Example: VLAN interface node network configuration policy
Create a VLAN interface on nodes in the cluster by applying a NodeNetworkConfigurationPolicy
manifest to the cluster.
The following YAML file is an example of a manifest for a VLAN interface. It includes samples values that you must replace with your own information.
apiVersion: nmstate.io/v1beta1 kind: NodeNetworkConfigurationPolicy metadata: name: vlan-eth1-policy 1 spec: nodeSelector: 2 kubernetes.io/hostname: <node01> 3 desiredState: interfaces: - name: eth1.102 4 description: VLAN using eth1 5 type: vlan 6 state: up 7 vlan: base-iface: eth1 8 id: 102 9
- 1
- Name of the policy.
- 2
- Optional: If you do not include the
nodeSelector
parameter, the policy applies to all nodes in the cluster. - 3
- This example uses a
hostname
node selector. - 4
- Name of the interface.
- 5
- Optional: Human-readable description of the interface.
- 6
- The type of interface. This example creates a VLAN.
- 7
- The requested state for the interface after creation.
- 8
- The node NIC to which the VLAN is attached.
- 9
- The VLAN tag.
11.2.5.3. Example: Bond interface node network configuration policy
Create a bond interface on nodes in the cluster by applying a NodeNetworkConfigurationPolicy
manifest to the cluster.
OpenShift Virtualization only supports the following bond modes:
-
mode=1 active-backup
-
mode=2 balance-xor
-
mode=4 802.3ad
-
mode=5 balance-tlb
- mode=6 balance-alb
The following YAML file is an example of a manifest for a bond interface. It includes samples values that you must replace with your own information.
apiVersion: nmstate.io/v1beta1 kind: NodeNetworkConfigurationPolicy metadata: name: bond0-eth1-eth2-policy 1 spec: nodeSelector: 2 kubernetes.io/hostname: <node01> 3 desiredState: interfaces: - name: bond0 4 description: Bond enslaving eth1 and eth2 5 type: bond 6 state: up 7 ipv4: dhcp: true 8 enabled: true 9 link-aggregation: mode: active-backup 10 options: miimon: '140' 11 slaves: 12 - eth1 - eth2 mtu: 1450 13
- 1
- Name of the policy.
- 2
- Optional: If you do not include the
nodeSelector
parameter, the policy applies to all nodes in the cluster. - 3
- This example uses a
hostname
node selector. - 4
- Name of the interface.
- 5
- Optional: Human-readable description of the interface.
- 6
- The type of interface. This example creates a bond.
- 7
- The requested state for the interface after creation.
- 8
- Optional: If you do not use
dhcp
, you can either set a static IP or leave the interface without an IP address. - 9
- Enables
ipv4
in this example. - 10
- The driver mode for the bond. This example uses an active backup mode.
- 11
- Optional: This example uses miimon to inspect the bond link every 140ms.
- 12
- The subordinate node NICs in the bond.
- 13
- Optional: The maximum transmission unit (MTU) for the bond. If not specified, this value is set to
1500
by default.
11.2.5.4. Example: Ethernet interface node network configuration policy
Configure an Ethernet interface on nodes in the cluster by applying a NodeNetworkConfigurationPolicy
manifest to the cluster.
The following YAML file is an example of a manifest for an Ethernet interface. It includes sample values that you must replace with your own information.
apiVersion: nmstate.io/v1beta1 kind: NodeNetworkConfigurationPolicy metadata: name: eth1-policy 1 spec: nodeSelector: 2 kubernetes.io/hostname: <node01> 3 desiredState: interfaces: - name: eth1 4 description: Configuring eth1 on node01 5 type: ethernet 6 state: up 7 ipv4: dhcp: true 8 enabled: true 9
- 1
- Name of the policy.
- 2
- Optional: If you do not include the
nodeSelector
parameter, the policy applies to all nodes in the cluster. - 3
- This example uses a
hostname
node selector. - 4
- Name of the interface.
- 5
- Optional: Human-readable description of the interface.
- 6
- The type of interface. This example creates an Ethernet networking interface.
- 7
- The requested state for the interface after creation.
- 8
- Optional: If you do not use
dhcp
, you can either set a static IP or leave the interface without an IP address. - 9
- Enables
ipv4
in this example.
11.2.5.5. Example: Multiple interfaces in the same node network configuration policy
You can create multiple interfaces in the same node network configuration policy. These interfaces can reference each other, allowing you to build and deploy a network configuration by using a single policy manifest.
The following example snippet creates a bond that is named bond10
across two NICs and a Linux bridge that is named br1
that connects to the bond.
... interfaces: - name: bond10 description: Bonding eth2 and eth3 for Linux bridge type: bond state: up link-aggregation: slaves: - eth2 - eth3 - name: br1 description: Linux bridge on bond type: linux-bridge state: up bridge: port: - name: bond10 ...
11.2.6. Examples: IP management
The following example configuration snippets demonstrate different methods of IP management.
These examples use the ethernet
interface type to simplify the example while showing the related context in the policy configuration. These IP management examples can be used with the other interface types.
11.2.6.1. Static
The following snippet statically configures an IP address on the Ethernet interface:
...
interfaces:
- name: eth1
description: static IP on eth1
type: ethernet
state: up
ipv4:
address:
- ip: 192.168.122.250 1
prefix-length: 24
enabled: true
...
- 1
- Replace this value with the static IP address for the interface.
11.2.6.2. No IP address
The following snippet ensures that the interface has no IP address:
... interfaces: - name: eth1 description: No IP on eth1 type: ethernet state: up ipv4: enabled: false ...
11.2.6.3. Dynamic host configuration
The following snippet configures an Ethernet interface that uses a dynamic IP address, gateway address, and DNS:
... interfaces: - name: eth1 description: DHCP on eth1 type: ethernet state: up ipv4: dhcp: true enabled: true ...
The following snippet configures an Ethernet interface that uses a dynamic IP address but does not use a dynamic gateway address or DNS:
... interfaces: - name: eth1 description: DHCP without gateway or DNS on eth1 type: ethernet state: up ipv4: dhcp: true auto-gateway: false auto-dns: false enabled: true ...
11.2.6.4. DNS
The following snippet sets DNS configuration on the host.
... interfaces: ... dns-resolver: config: search: - example.com - example.org server: - 8.8.8.8 ...
11.2.6.5. Static routing
The following snippet configures a static route and a static IP on interface eth1
.
... interfaces: - name: eth1 description: Static routing on eth1 type: ethernet state: up ipv4: address: - ip: 192.0.2.251 1 prefix-length: 24 enabled: true routes: config: - destination: 198.51.100.0/24 metric: 150 next-hop-address: 192.0.2.1 2 next-hop-interface: eth1 table-id: 254 ...
11.3. Troubleshooting node network configuration
If the node network configuration encounters an issue, the policy is automatically rolled back and the enactments report failure. This includes issues such as:
- The configuration fails to be applied on the host.
- The host loses connection to the default gateway.
- The host loses connection to the API server.
11.3.1. Troubleshooting an incorrect node network configuration policy configuration
You can apply changes to the node network configuration across your entire cluster by applying a node network configuration policy. If you apply an incorrect configuration, you can use the following example to troubleshoot and correct the failed node network policy.
In this example, a Linux bridge policy is applied to an example cluster that has three control plane nodes (master) and three compute (worker) nodes. The policy fails to be applied because it references an incorrect interface. To find the error, investigate the available NMState resources. You can then update the policy with the correct configuration.
Procedure
Create a policy and apply it to your cluster. The following example creates a simple bridge on the
ens01
interface:apiVersion: nmstate.io/v1beta1 kind: NodeNetworkConfigurationPolicy metadata: name: ens01-bridge-testfail spec: desiredState: interfaces: - name: br1 description: Linux bridge with the wrong port type: linux-bridge state: up ipv4: dhcp: true enabled: true bridge: options: stp: enabled: false port: - name: ens01
$ oc apply -f ens01-bridge-testfail.yaml
Example output
nodenetworkconfigurationpolicy.nmstate.io/ens01-bridge-testfail created
Verify the status of the policy by running the following command:
$ oc get nncp
The output shows that the policy failed:
Example output
NAME STATUS ens01-bridge-testfail FailedToConfigure
However, the policy status alone does not indicate if it failed on all nodes or a subset of nodes.
List the node network configuration enactments to see if the policy was successful on any of the nodes. If the policy failed for only a subset of nodes, it suggests that the problem is with a specific node configuration. If the policy failed on all nodes, it suggests that the problem is with the policy.
$ oc get nnce
The output shows that the policy failed on all nodes:
Example output
NAME STATUS control-plane-1.ens01-bridge-testfail FailedToConfigure control-plane-2.ens01-bridge-testfail FailedToConfigure control-plane-3.ens01-bridge-testfail FailedToConfigure compute-1.ens01-bridge-testfail FailedToConfigure compute-2.ens01-bridge-testfail FailedToConfigure compute-3.ens01-bridge-testfail FailedToConfigure
View one of the failed enactments and look at the traceback. The following command uses the output tool
jsonpath
to filter the output:$ oc get nnce compute-1.ens01-bridge-testfail -o jsonpath='{.status.conditions[?(@.type=="Failing")].message}'
This command returns a large traceback that has been edited for brevity:
Example output
error reconciling NodeNetworkConfigurationPolicy at desired state apply: , failed to execute nmstatectl set --no-commit --timeout 480: 'exit status 1' '' ... libnmstate.error.NmstateVerificationError: desired ======= --- name: br1 type: linux-bridge state: up bridge: options: group-forward-mask: 0 mac-ageing-time: 300 multicast-snooping: true stp: enabled: false forward-delay: 15 hello-time: 2 max-age: 20 priority: 32768 port: - name: ens01 description: Linux bridge with the wrong port ipv4: address: [] auto-dns: true auto-gateway: true auto-routes: true dhcp: true enabled: true ipv6: enabled: false mac-address: 01-23-45-67-89-AB mtu: 1500 current ======= --- name: br1 type: linux-bridge state: up bridge: options: group-forward-mask: 0 mac-ageing-time: 300 multicast-snooping: true stp: enabled: false forward-delay: 15 hello-time: 2 max-age: 20 priority: 32768 port: [] description: Linux bridge with the wrong port ipv4: address: [] auto-dns: true auto-gateway: true auto-routes: true dhcp: true enabled: true ipv6: enabled: false mac-address: 01-23-45-67-89-AB mtu: 1500 difference ========== --- desired +++ current @@ -13,8 +13,7 @@ hello-time: 2 max-age: 20 priority: 32768 - port: - - name: ens01 + port: [] description: Linux bridge with the wrong port ipv4: address: [] line 651, in _assert_interfaces_equal\n current_state.interfaces[ifname],\nlibnmstate.error.NmstateVerificationError:
The
NmstateVerificationError
lists thedesired
policy configuration, thecurrent
configuration of the policy on the node, and thedifference
highlighting the parameters that do not match. In this example, theport
is included in thedifference
, which suggests that the problem is the port configuration in the policy.To ensure that the policy is configured properly, view the network configuration for one or all of the nodes by requesting the
NodeNetworkState
object. The following command returns the network configuration for thecontrol-plane-1
node:$ oc get nns control-plane-1 -o yaml
The output shows that the interface name on the nodes is
ens1
but the failed policy incorrectly usesens01
:Example output
- ipv4: ... name: ens1 state: up type: ethernet
Correct the error by editing the existing policy:
$ oc edit nncp ens01-bridge-testfail
... port: - name: ens1
Save the policy to apply the correction.
Check the status of the policy to ensure it updated successfully:
$ oc get nncp
Example output
NAME STATUS ens01-bridge-testfail SuccessfullyConfigured
The updated policy is successfully configured on all nodes in the cluster.
Chapter 12. Logging, events, and monitoring
12.1. Viewing virtual machine logs
12.1.1. Understanding virtual machine logs
Logs are collected for OpenShift Container Platform builds, deployments, and pods. In OpenShift Virtualization, virtual machine logs can be retrieved from the virtual machine launcher pod in either the web console or the CLI.
The -f
option follows the log output in real time, which is useful for monitoring progress and error checking.
If the launcher pod is failing to start, use the --previous
option to see the logs of the last attempt.
ErrImagePull
and ImagePullBackOff
errors can be caused by an incorrect deployment configuration or problems with the images that are referenced.
12.1.2. Viewing virtual machine logs in the CLI
Get virtual machine logs from the virtual machine launcher pod.
Procedure
Use the following command:
$ oc logs <virt-launcher-name>
12.1.3. Viewing virtual machine logs in the web console
Get virtual machine logs from the associated virtual machine launcher pod.
Procedure
- In the OpenShift Virtualization console, click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
-
In the Details tab, click the
virt-launcher-<name>
pod in the Pod section. - Click Logs.
12.2. Viewing events
12.2.1. Understanding virtual machine events
OpenShift Container Platform events are records of important life-cycle information in a namespace and are useful for monitoring and troubleshooting resource scheduling, creation, and deletion issues.
OpenShift Virtualization adds events for virtual machines and virtual machine instances. These can be viewed from either the web console or the CLI.
See also: Viewing system event information in an OpenShift Container Platform cluster.
12.2.2. Viewing the events for a virtual machine in the web console
You can view the stream events for a running a virtual machine from the Virtual Machine Overview panel of the web console.
The ▮▮ button pauses the events stream.
The ▶ button continues a paused events stream.
Procedure
- Click Workloads → Virtualization from the side menu.
- Click the Virtual Machines tab.
- Select a virtual machine to open the Virtual Machine Overview screen.
- Click Events to view all events for the virtual machine.
12.2.3. Viewing namespace events in the CLI
Use the OpenShift Container Platform client to get the events for a namespace.
Procedure
In the namespace, use the
oc get
command:$ oc get events
12.2.4. Viewing resource events in the CLI
Events are included in the resource description, which you can get using the OpenShift Container Platform client.
Procedure
In the namespace, use the
oc describe
command. The following example shows how to get the events for a virtual machine, a virtual machine instance, and the virt-launcher pod for a virtual machine:$ oc describe vm <vm>
$ oc describe vmi <vmi>
$ oc describe pod virt-launcher-<name>
12.3. Diagnosing data volumes using events and conditions
Use the oc describe
command to analyze and help resolve issues with data volumes.
12.3.1. About conditions and events
Diagnose data volume issues by examining the output of the Conditions
and Events
sections generated by the command:
$ oc describe dv <DataVolume>
There are three Types
in the Conditions
section that display:
-
Bound
-
Running
-
Ready
The Events
section provides the following additional information:
-
Type
of event -
Reason
for logging -
Source
of the event -
Message
containing additional diagnostic information.
The output from oc describe
does not always contains Events
.
An event is generated when either Status
, Reason
, or Message
changes. Both conditions and events react to changes in the state of the data volume.
For example, if you misspell the URL during an import operation, the import generates a 404 message. That message change generates an event with a reason. The output in the Conditions
section is updated as well.
12.3.2. Analyzing data volumes using conditions and events
By inspecting the Conditions
and Events
sections generated by the describe
command, you determine the state of the data volume in relation to persistent volume claims (PVCs), and whether or not an operation is actively running or completed. You might also receive messages that offer specific details about the status of the data volume, and how it came to be in its current state.
There are many different combinations of conditions. Each must be evaluated in its unique context.
Examples of various combinations follow.
Bound
– A successfully bound PVC displays in this example.Note that the
Type
isBound
, so theStatus
isTrue
. If the PVC is not bound, theStatus
isFalse
.When the PVC is bound, an event is generated stating that the PVC is bound. In this case, the
Reason
isBound
andStatus
isTrue
. TheMessage
indicates which PVC owns the data volume.Message
, in theEvents
section, provides further details including how long the PVC has been bound (Age
) and by what resource (From
), in this casedatavolume-controller
:Example output
Status: Conditions: Last Heart Beat Time: 2020-07-15T03:58:24Z Last Transition Time: 2020-07-15T03:58:24Z Message: PVC win10-rootdisk Bound Reason: Bound Status: True Type: Bound Events: Type Reason Age From Message ---- ------ ---- ---- ------- Normal Bound 24s datavolume-controller PVC example-dv Bound
Running
– In this case, note thatType
isRunning
andStatus
isFalse
, indicating that an event has occurred that caused an attempted operation to fail, changing the Status fromTrue
toFalse
.However, note that
Reason
isCompleted
and theMessage
field indicatesImport Complete
.In the
Events
section, theReason
andMessage
contain additional troubleshooting information about the failed operation. In this example, theMessage
displays an inability to connect due to a404
, listed in theEvents
section’s firstWarning
.From this information, you conclude that an import operation was running, creating contention for other operations that are attempting to access the data volume:
Example output
Status: Conditions: Last Heart Beat Time: 2020-07-15T04:31:39Z Last Transition Time: 2020-07-15T04:31:39Z Message: Import Complete Reason: Completed Status: False Type: Running Events: Type Reason Age From Message ---- ------ ---- ---- ------- Warning Error 12s (x2 over 14s) datavolume-controller Unable to connect to http data source: expected status code 200, got 404. Status: 404 Not Found
Ready
– IfType
isReady
andStatus
isTrue
, then the data volume is ready to be used, as in the following example. If the data volume is not ready to be used, theStatus
isFalse
:Example output
Status: Conditions: Last Heart Beat Time: 2020-07-15T04:31:39Z Last Transition Time: 2020-07-15T04:31:39Z Status: True Type: Ready
12.4. Viewing information about virtual machine workloads
You can view high-level information about your virtual machines by using the Virtual Machines dashboard in the OpenShift Container Platform web console.
12.4.1. About the Virtual Machines dashboard
Access virtual machines from the OpenShift Container Platform web console by navigating to the Workloads → Virtualization page. The Workloads → Virtualization page contains two tabs:
- Virtual Machines
- Virtual Machine Templates
The following cards describe each virtual machine:
Details provides identifying information about the virtual machine, including:
- Name
- Namespace
- Date of creation
- Node name
- IP address
Inventory lists the virtual machine’s resources, including:
- Network interface controllers (NICs)
- Disks
Status includes:
- The current status of the virtual machine
- A note indicating whether or not the QEMU guest agent is installed on the virtual machine
Utilization includes charts that display usage data for:
- CPU
- Memory
- Filesystem
- Network transfer
Use the drop-down list to choose a duration for the utilization data. The available options are 1 Hour, 6 Hours, and 24 Hours.
- Events lists messages about virtual machine activity over the past hour. To view additional events, click View all.
12.5. Monitoring virtual machine health
A virtual machine instance (VMI) can become unhealthy due to transient issues such as connectivity loss, deadlocks, or problems with external dependencies. A health check periodically performs diagnostics on a VMI by using any combination of the readiness and liveness probes.
12.5.1. About readiness and liveness probes
Use readiness and liveness probes to detect and handle unhealthy virtual machine instances (VMIs). You can include one or more probes in the specification of the VMI to ensure that traffic does not reach a VMI that is not ready for it and that a new instance is created when a VMI becomes unresponsive.
A readiness probe determines whether a VMI is ready to accept service requests. If the probe fails, the VMI is removed from the list of available endpoints until the VMI is ready.
A liveness probe determines whether a VMI is responsive. If the probe fails, the VMI is deleted and a new instance is created to restore responsiveness.
You can configure readiness and liveness probes by setting the spec.readinessProbe
and the spec.livenessProbe
fields of the VirtualMachineInstance
object. These fields support the following tests:
- HTTP GET
- The probe determines the health of the VMI by using a web hook. The test is successful if the HTTP response code is between 200 and 399. You can use an HTTP GET test with applications that return HTTP status codes when they are completely initialized.
- TCP socket
- The probe attempts to open a socket to the VMI. The VMI is only considered healthy if the probe can establish a connection. You can use a TCP socket test with applications that do not start listening until initialization is complete.
12.5.2. Defining an HTTP readiness probe
Define an HTTP readiness probe by setting the spec.readinessProbe.httpGet
field of the virtual machine instance (VMI) configuration.
Procedure
Include details of the readiness probe in the VMI configuration file.
Sample readiness probe with an HTTP GET test
# ... spec: readinessProbe: httpGet: 1 port: 1500 2 path: /healthz 3 httpHeaders: - name: Custom-Header value: Awesome initialDelaySeconds: 120 4 periodSeconds: 20 5 timeoutSeconds: 10 6 failureThreshold: 3 7 successThreshold: 3 8 # ...
- 1
- The HTTP GET request to perform to connect to the VMI.
- 2
- The port of the VMI that the probe queries. In the above example, the probe queries port 1500.
- 3
- The path to access on the HTTP server. In the above example, if the handler for the server’s /healthz path returns a success code, the VMI is considered to be healthy. If the handler returns a failure code, the VMI is removed from the list of available endpoints.
- 4
- The time, in seconds, after the VMI starts before the readiness probe is initiated.
- 5
- The delay, in seconds, between performing probes. The default delay is 10 seconds. This value must be greater than
timeoutSeconds
. - 6
- The number of seconds of inactivity after which the probe times out and the VMI is assumed to have failed. The default value is 1. This value must be lower than
periodSeconds
. - 7
- The number of times that the probe is allowed to fail. The default is 3. After the specified number of attempts, the pod is marked
Unready
. - 8
- The number of times that the probe must report success, after a failure, to be considered successful. The default is 1.
Create the VMI by running the following command:
$ oc create -f <file_name>.yaml
12.5.3. Defining a TCP readiness probe
Define a TCP readiness probe by setting the spec.readinessProbe.tcpSocket
field of the virtual machine instance (VMI) configuration.
Procedure
Include details of the TCP readiness probe in the VMI configuration file.
Sample readiness probe with a TCP socket test
... spec: readinessProbe: initialDelaySeconds: 120 1 periodSeconds: 20 2 tcpSocket: 3 port: 1500 4 timeoutSeconds: 10 5 ...
- 1
- The time, in seconds, after the VMI starts before the readiness probe is initiated.
- 2
- The delay, in seconds, between performing probes. The default delay is 10 seconds. This value must be greater than
timeoutSeconds
. - 3
- The TCP action to perform.
- 4
- The port of the VMI that the probe queries.
- 5
- The number of seconds of inactivity after which the probe times out and the VMI is assumed to have failed. The default value is 1. This value must be lower than
periodSeconds
.
Create the VMI by running the following command:
$ oc create -f <file_name>.yaml
12.5.4. Defining an HTTP liveness probe
Define an HTTP liveness probe by setting the spec.livenessProbe.httpGet
field of the virtual machine instance (VMI) configuration. You can define both HTTP and TCP tests for liveness probes in the same way as readiness probes. This procedure configures a sample liveness probe with an HTTP GET test.
Procedure
Include details of the HTTP liveness probe in the VMI configuration file.
Sample liveness probe with an HTTP GET test
# ... spec: livenessProbe: initialDelaySeconds: 120 1 periodSeconds: 20 2 httpGet: 3 port: 1500 4 path: /healthz 5 httpHeaders: - name: Custom-Header value: Awesome timeoutSeconds: 10 6 # ...
- 1
- The time, in seconds, after the VMI starts before the liveness probe is initiated.
- 2
- The delay, in seconds, between performing probes. The default delay is 10 seconds. This value must be greater than
timeoutSeconds
. - 3
- The HTTP GET request to perform to connect to the VMI.
- 4
- The port of the VMI that the probe queries. In the above example, the probe queries port 1500. The VMI installs and runs a minimal HTTP server on port 1500 via cloud-init.
- 5
- The path to access on the HTTP server. In the above example, if the handler for the server’s
/healthz
path returns a success code, the VMI is considered to be healthy. If the handler returns a failure code, the VMI is deleted and a new instance is created. - 6
- The number of seconds of inactivity after which the probe times out and the VMI is assumed to have failed. The default value is 1. This value must be lower than
periodSeconds
.
Create the VMI by running the following command:
$ oc create -f <file_name>.yaml
12.5.5. Template: Virtual machine instance configuration file for defining health checks
apiVersion: kubevirt.io/v1alpha3 kind: VirtualMachineInstance metadata: labels: special: vmi-fedora name: vmi-fedora spec: domain: devices: disks: - disk: bus: virtio name: containerdisk - disk: bus: virtio name: cloudinitdisk resources: requests: memory: 1024M readinessProbe: httpGet: port: 1500 initialDelaySeconds: 120 periodSeconds: 20 timeoutSeconds: 10 failureThreshold: 3 successThreshold: 3 terminationGracePeriodSeconds: 0 volumes: - name: containerdisk containerDisk: image: kubevirt/fedora-cloud-registry-disk-demo - cloudInitNoCloud: userData: |- #cloud-config password: fedora chpasswd: { expire: False } bootcmd: - setenforce 0 - dnf install -y nmap-ncat - systemd-run --unit=httpserver nc -klp 1500 -e '/usr/bin/echo -e HTTP/1.1 200 OK\\n\\nHello World!' name: cloudinitdisk
12.5.6. Additional resources
12.6. Using the OpenShift Container Platform dashboard to get cluster information
Access the OpenShift Container Platform dashboard, which captures high-level information about the cluster, by clicking Home > Dashboards > Overview from the OpenShift Container Platform web console.
The OpenShift Container Platform dashboard provides various cluster information, captured in individual dashboard cards.
12.6.1. About the OpenShift Container Platform dashboards page
The OpenShift Container Platform dashboard consists of the following cards:
Details provides a brief overview of informational cluster details.
Status include ok, error, warning, in progress, and unknown. Resources can add custom status names.
- Cluster ID
- Provider
- Version
Cluster Inventory details number of resources and associated statuses. It is helpful when intervention is required to resolve problems, including information about:
- Number of nodes
- Number of pods
- Persistent storage volume claims
- Virtual machines (available if OpenShift Virtualization is installed)
- Bare metal hosts in the cluster, listed according to their state (only available in metal3 environment).
- Cluster Health summarizes the current health of the cluster as a whole, including relevant alerts and descriptions. If OpenShift Virtualization is installed, the overall health of OpenShift Virtualization is diagnosed as well. If more than one subsystem is present, click See All to view the status of each subsystem.
Cluster Capacity charts help administrators understand when additional resources are required in the cluster. The charts contain an inner ring that displays current consumption, while an outer ring displays thresholds configured for the resource, including information about:
- CPU time
- Memory allocation
- Storage consumed
- Network resources consumed
- Cluster Utilization shows the capacity of various resources over a specified period of time, to help administrators understand the scale and frequency of high resource consumption.
- Events lists messages related to recent activity in the cluster, such as pod creation or virtual machine migration to another host.
- Top Consumers helps administrators understand how cluster resources are consumed. Click on a resource to jump to a detailed page listing pods and nodes that consume the largest amount of the specified cluster resource (CPU, memory, or storage).
12.7. OpenShift Container Platform cluster monitoring, logging, and Telemetry
OpenShift Container Platform provides various resources for monitoring at the cluster level.
12.7.1. About OpenShift Container Platform monitoring
OpenShift Container Platform includes a pre-configured, pre-installed, and self-updating monitoring stack that provides monitoring for core platform components. OpenShift Container Platform delivers monitoring best practices out of the box. A set of alerts are included by default that immediately notify cluster administrators about issues with a cluster. Default dashboards in the OpenShift Container Platform web console include visual representations of cluster metrics to help you to quickly understand the state of your cluster.
After installing OpenShift Container Platform 4.7, cluster administrators can optionally enable monitoring for user-defined projects. By using this feature, cluster administrators, developers, and other users can specify how services and pods are monitored in their own projects. You can then query metrics, review dashboards, and manage alerting rules and silences for your own projects in the OpenShift Container Platform web console.
Cluster administrators can grant developers and other users permission to monitor their own projects. Privileges are granted by assigning one of the predefined monitoring roles.
12.7.2. About OpenShift Logging components
The OpenShift Logging components include a collector deployed to each node in the OpenShift Container Platform cluster that collects all node and container logs and writes them to a log store. You can use a centralized web UI to create rich visualizations and dashboards with the aggregated data.
The major components of OpenShift Logging are:
- collection - This is the component that collects logs from the cluster, formats them, and forwards them to the log store. The current implementation is Fluentd.
- log store - This is where the logs are stored. The default implementation is Elasticsearch. You can use the default Elasticsearch log store or forward logs to external log stores. The default log store is optimized and tested for short-term storage.
- visualization - This is the UI component you can use to view logs, graphs, charts, and so forth. The current implementation is Kibana.
For more information on OpenShift Logging, see the OpenShift Logging documentation.
12.7.3. About Telemetry
Telemetry sends a carefully chosen subset of the cluster monitoring metrics to Red Hat. The Telemeter Client fetches the metrics values every four minutes and thirty seconds and uploads the data to Red Hat. These metrics are described in this document.
This stream of data is used by Red Hat to monitor the clusters in real-time and to react as necessary to problems that impact our customers. It also allows Red Hat to roll out OpenShift Container Platform upgrades to customers to minimize service impact and continuously improve the upgrade experience.
This debugging information is available to Red Hat Support and Engineering teams with the same restrictions as accessing data reported through support cases. All connected cluster information is used by Red Hat to help make OpenShift Container Platform better and more intuitive to use.
12.7.3.1. Information collected by Telemetry
The following information is collected by Telemetry:
- The unique random identifier that is generated during an installation
- Version information, including the OpenShift Container Platform cluster version and installed update details that are used to determine update version availability
- Update information, including the number of updates available per cluster, the channel and image repository used for an update, update progress information, and the number of errors that occur in an update
- The name of the provider platform that OpenShift Container Platform is deployed on and the data center location
- Sizing information about clusters, machine types, and machines, including the number of CPU cores and the amount of RAM used for each
- The number of running virtual machine instances in a cluster
- The number of etcd members and the number of objects stored in the etcd cluster
- The OpenShift Container Platform framework components installed in a cluster and their condition and status
- Usage information about components, features, and extensions
- Usage details about Technology Previews and unsupported configurations
- Information about degraded software
-
Information about nodes that are marked as
NotReady
- Events for all namespaces listed as "related objects" for a degraded Operator
- Configuration details that help Red Hat Support to provide beneficial support for customers. This includes node configuration at the cloud infrastructure level, hostnames, IP addresses, Kubernetes pod names, namespaces, and services.
- Information about the validity of certificates
Telemetry does not collect identifying information such as user names, or passwords. Red Hat does not intend to collect personal information. If Red Hat discovers that personal information has been inadvertently received, Red Hat will delete such information. To the extent that any telemetry data constitutes personal data, please refer to the Red Hat Privacy Statement for more information about Red Hat’s privacy practices.
12.7.4. CLI troubleshooting and debugging commands
For a list of the oc
client troubleshooting and debugging commands, see the OpenShift Container Platform CLI tools documentation.
12.8. Collecting data for Red Hat Support
When you submit a support case to Red Hat Support, it is helpful to provide debugging information for OpenShift Container Platform and OpenShift Virtualization by using the following tools:
- must-gather tool
-
The
must-gather
tool collects diagnostic information, including resource definitions and service logs. - Prometheus
- Prometheus is a time-series database and a rule evaluation engine for metrics. Prometheus sends alerts to Alertmanager for processing.
- Alertmanager
- The Alertmanager service handles alerts received from Prometheus. The Alertmanager is also responsible for sending the alerts to external notification systems.
12.8.1. Collecting data about your environment
Collecting data about your environment minimizes the time required to analyze and determine the root cause.
Prerequisites
- Set the retention time for Prometheus metrics data to a minimum of seven days.
- Configure the Alertmanager to capture relevant alerts and to send them to a dedicated mailbox so that they can be viewed and persisted outside the cluster.
- Record the exact number of affected nodes and virtual machines.
Procedure
-
Collect
must-gather
data for the cluster by using the defaultmust-gather
image. -
Collect
must-gather
data for Red Hat OpenShift Container Storage, if necessary. -
Collect
must-gather
data for OpenShift Virtualization by using the OpenShift Virtualizationmust-gather
image. - Collect Prometheus metrics for the cluster.
12.8.1.1. Additional resources
- Configuring the retention time for Prometheus metrics data
- Configuring the Alertmanager to send alert notifications to external systems
-
Collecting
must-gather
data for OpenShift Container Platform -
Collecting
must-gather
data for OpenShift Virtualization - Collecting Prometheus metrics for all projects as a cluster administrator
12.8.2. Collecting data about virtual machines
Collecting data about malfunctioning virtual machines (VMs) minimizes the time required to analyze and determine the root cause.
Prerequisites
Windows VMs:
- Record the Windows patch update details for Red Hat Support.
- Install the latest version of the VirtIO drivers. The VirtIO drivers include the QEMU guest agent.
- If Remote Desktop Protocol (RDP) is enabled, try to connect to the VMs with RDP to determine whether there is a problem with the connection software.
Procedure
-
Collect detailed
must-gather
data about the malfunctioning VMs. - Collect screenshots of VMs that have crashed before you restart them.
- Record factors that the malfunctioning VMs have in common. For example, the VMs have the same host or network.
12.8.2.1. Additional resources
- Installing VirtIO drivers on Windows VMs
- Downloading and installing VirtIO drivers on Windows VMs without host access
- Connecting to Windows VMs with RDP using the web console or the command line
-
Collecting
must-gather
data about virtual machines
12.8.3. Using the must-gather tool for OpenShift Virtualization
You can collect data about OpenShift Virtualization resources by running the must-gather
command with the OpenShift Virtualization image.
The default data collection includes information about the following resources:
- OpenShift Virtualization Operator namespaces, including child objects
- OpenShift Virtualization custom resource definitions
- Namespaces that contain virtual machines
- Basic virtual machine definitions
Procedure
Run the following command to collect data about OpenShift Virtualization:
$ oc adm must-gather --image-stream=openshift/must-gather \ --image=registry.redhat.io/container-native-virtualization/cnv-must-gather-rhel8:v{HCOVersion}
12.8.3.1. must-gather tool options
You can specify a combination of scripts and environment variables for the following options:
- Collecting detailed virtual machine (VM) information from a namespace
- Collecting detailed information about specified VMs
- Collecting image and image stream information
-
Limiting the maximum number of parallel processes used by the
must-gather
tool
12.8.3.1.1. Parameters
Environment variables
You can specify environment variables for a compatible script.
NS=<namespace_name>
-
Collect virtual machine information, including
virt-launcher
pod details, from the namespace that you specify. TheVirtualMachine
andVirtualMachineInstance
CR data is collected for all namespaces. VM=<vm_name>
-
Collect details about a particular virtual machine. To use this option, you must also specify a namespace by using the
NS
environment variable. PROS=<number_of_processes>
Modify the maximum number of parallel processes that the
must-gather
tool uses. The default value is5
.ImportantUsing too many parallel processes can cause performance issues. Increasing the maximum number of parallel processes is not recommended.
Scripts
Each script is only compatible with certain environment variable combinations.
gather_vms_details
-
Collect VM log files, VM definitions, and namespaces (and their child objects) that belong to OpenShift Virtualization resources. If you use this parameter without specifying a namespace or VM, the
must-gather
tool collects this data for all VMs in the cluster. This script is compatible with all environment variables, but you must specify a namespace if you use theVM
variable. gather
-
Use the default
must-gather
script, which collects cluster data from all namespaces and includes only basic VM information. This script is only compatible with thePROS
variable. gather_images
-
Collect image and image stream custom resource information. This script is only compatible with the
PROS
variable.
12.8.3.1.2. Usage and examples
Environment variables are optional. You can run a script by itself or with one or more compatible environment variables.
Script | Compatible environment variable |
---|---|
|
|
|
|
|
|
To customize the data that must-gather
collects, you append a double dash (--
) to the command, followed by a space and one or more compatible parameters.
Syntax
$ oc adm must-gather \ --image=registry.redhat.io/container-native-virtualization/cnv-must-gather-rhel8:v2.6.10 \ -- <environment_variable_1> <environment_variable_2> <script_name>
Detailed VM information
The following command collects detailed VM information for the my-vm
VM in the mynamespace
namespace:
$ oc adm must-gather \
--image=registry.redhat.io/container-native-virtualization/cnv-must-gather-rhel8:v2.6.10 \
-- NS=mynamespace VM=my-vm gather_vms_details 1
- 1
- The
NS
environment variable is mandatory if you use theVM
environment variable.
Default data collection limited to three parallel processes
The following command collects default must-gather
information by using a maximum of three parallel processes:
$ oc adm must-gather \ --image=registry.redhat.io/container-native-virtualization/cnv-must-gather-rhel8:v2.6.10 \ -- PROS=3 gather
Image and image stream information
The following command collects image and image stream information from the cluster:
$ oc adm must-gather \ --image=registry.redhat.io/container-native-virtualization/cnv-must-gather-rhel8:v2.6.10 \ -- gather_images
12.8.3.2. Additional resources
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