Clusters

Installation status might get stuck in the Installing state when you install multicluster engine operator on a OpenShift Service on AWS with hosted control planes cluster. The local-cluster might also remain in the Unknown state.

When you check the klusterlet-agent pod log in the open-cluster-management-agent namespace on your hub cluster, you see an error that resembles the following:

E0809 18:45:29.450874       1 reflector.go:147] k8s.io/client-go@v0.29.4/tools/cache/reflector.go:229: Failed to watch *v1.CertificateSigningRequest: failed to list *v1.CertificateSigningRequest: Get "https://api.xxx.openshiftapps.com:443/apis/certificates.k8s.io/v1/certificatesigningrequests?limit=500&resourceVersion=0": tls: failed to verify certificate: x509: certificate signed by unknown authority

To resolve the problem, configure the hub cluster API server verification strategy. Complete the following steps:

When enabling the managed-serviceaccount add-on, the installNamespace field in the ManagedClusterAddOn resource must have open-cluster-management-agent-addon as the value. Other values are ignored. The managed-serviceaccount add-on agent is always deployed in the open-cluster-management-agent-addon namespace on the managed cluster.

Develop quicker by configuring copy and paste features. To configure the copy-from-mac feature in the assisted-installer, you must add the mac-address to the nmstate definition interface and the mac-mapping interface. The mac-mapping interface is provided outside the nmstate definition interface. As a result, you must provide the same mac-address twice.

If you have a different version of VolSync installed, replace v0.6.0 with your installed version.

After you delete a ManagedClusterSet, the label that is added to each managed cluster that associates the cluster to the cluster set is not automatically removed. Manually remove the label from each of the managed clusters that were included in the deleted managed cluster set. The label resembles the following example: cluster.open-cluster-management.io/clusterset:<ManagedClusterSet Name>.

If you create a Hive ClusterClaim against a ClusterPool and manually set the ClusterClaimspec lifetime field to an invalid golang time value, the product stops fulfilling and reconciling all ClusterClaims, not just the malformed claim.

You see the following error in the clusterclaim-controller pod logs, which is a specific example with the PoolName and invalid lifetime included:

E0203 07:10:38.266841       1 reflector.go:138] sigs.k8s.io/controller-runtime/pkg/cache/internal/informers_map.go:224: Failed to watch *v1.ClusterClaim: failed to list *v1.ClusterClaim: v1.ClusterClaimList.Items: []v1.ClusterClaim: v1.ClusterClaim.v1.ClusterClaim.Spec: v1.ClusterClaimSpec.Lifetime: unmarshalerDecoder: time: unknown unit "w" in duration "1w", error found in #10 byte of ...|time":"1w"}},{"apiVe|..., bigger context ...|clusterPoolName":"policy-aas-hubs","lifetime":"1w"}},{"apiVersion":"hive.openshift.io/v1","kind":"Cl|...

You can delete the invalid claim.

If the malformed claim is deleted, claims begin successfully reconciling again without any further interaction.

The clusterimageset is in fast channel, but the provisioned cluster is in stable channel. Currently the product does not sync the channel to the provisioned OpenShift Container Platform cluster.

Change to the right channel in the OpenShift Container Platform console. Click Administration > Cluster Settings > Details Channel.

When you create an on-premises cluster using the console, you must select an available subnet for your cluster. It is not marked as a required field.

An Automation template that is configured to automatically provision a managed cluster might fail when both of the following conditions are met:

You cannot delete the namespace of a managed cluster manually. The managed cluster namespace is automatically deleted after the managed cluster is detached. If you delete the managed cluster namespace manually before the managed cluster is detached, the managed cluster shows a continuous terminating status after you delete the managed cluster. To delete this terminating managed cluster, manually remove the finalizers from the managed cluster that you detached.

When you change your cloud provider access key on the cloud provider side, you also need to update the corresponding credential for this cloud provider on the console of multicluster engine operator. This is required when your credentials expire on the cloud provider where the managed cluster is hosted and you try to delete the managed cluster.

When you destroy a managed cluster, the status continues to display Destroying after one hour, and the cluster is not destroyed. To resolve this issue complete the following steps:

You cannot use the Red Hat Advanced Cluster Management console to upgrade OpenShift Container Platform managed clusters that are in the OpenShift Container Platform Dedicated environment.

The search details page for a certain resource on a certain managed cluster might fail. You must ensure that the work-manager add-on in the managed cluster is in Available status before you can search.

The ManagedServiceAccount and cluster proxy add-ons are enabled by default in Red Hat Advanced Cluster Management version 2.10 and newer. If the add-ons are disabled after upgrading, you must enable the ManagedServiceAccount and cluster proxy add-ons manually to use the pod log feature on non-OpenShift Container Platform managed clusters.

See ManagedServiceAccount add-on to learn how to enable ManagedServiceAccount and see Using cluster proxy add-ons to learn how to enable a cluster proxy add-on.

When you create a hosting service cluster with a cluster-wide proxy configuration on OpenShift Container Platform 4.10.z, the nodeip-configuration.service service does not start on the worker nodes.

iPXE is an open source network boot firmware. See iPXE for more details.

When booting a node, the URL length limitation in some DHCP servers cuts off the ipxeScript URL in the InfraEnv custom resource definition, resulting in the following error message in the console:

no bootable devices

To work around the issue, complete the following steps:

If you are using the removed BareMetalAssets API in Red Hat Advanced Cluster Management 2.6, the ClusterDeployment cannot be deleted after upgrading to Red Hat Advanced Cluster Management 2.7 because the BareMetalAssets API is bound to the ClusterDeployment.

To work around the issue, run the following command to remove the finalizers before upgrading to Red Hat Advanced Cluster Management 2.7:

oc patch clusterdeployment <clusterdeployment-name> -p '{"metadata":{"finalizers":null}}' --type=merge

The converged flow is the default process of provisioning. When you use the BareMetalHost resource for the Bare Metal Operator (BMO) to connect your host to a live ISO, the Ironic Python Agent does the following actions:

If the Assisted Installer agent starts slowly and you deploy a managed cluster, the managed cluster might become stuck in the Pending status and not have any agent resources. You can work around the issue by disabling the converged flow.

Important: When you disable the converged flow, only the Assisted Installer agent runs in the live ISO, reducing the number of open ports and disabling any features you enabled with the Ironic Python Agent agent, including the following:

To decide what port numbers you want to enable or disable without disabling the converged flow, see Network configuration.

To disable the converged flow, complete the following steps:

The selectorType: LaberSelector setting is not supported when using the Clustersets API. The selectorType: ExclusiveClusterSetLabel setting is supported.

When you upgrade an OpenShift Container Platform Dedicated cluster by using the ClusterCurator resource, the upgrade fails because the Cluster curator does not support OpenShift Container Platform Dedicated clusters.

You can specify a custom ingress domain by using the ClusterDeployment resource while installing a managed cluster, but the change is only applied after the installation by using the SyncSet resource. As a result, the spec field in the clusterdeployment.yaml file displays the custom ingress domain you specified, but the status still displays the default domain.

If you define configurations in the ManagedClusterAddon to override some configurations in the ClusterManagementAddon, the ManagedClusterAddon might become stuck at the following status:

progressing... mca and work configs mismatch

When you check the ManagedClusterAddon status, a part of the configurations has an empty spec hash, even if the configurations exist. See the following example:

status:
  conditions:
  - lastTransitionTime: "2024-09-09T16:08:42Z"
    message: progressing... mca and work configs mismatch
    reason: Progressing
    status: "True"
    type: Progressing
...
  configReferences:
  - desiredConfig:
      name: deploy-config
      namespace: open-cluster-management-hub
      specHash: b81380f1f1a1920388d90859a5d51f5521cecd77752755ba05ece495f551ebd0
    group: addon.open-cluster-management.io
    lastObservedGeneration: 1
    name: deploy-config
    namespace: open-cluster-management-hub
    resource: addondeploymentconfigs
  - desiredConfig:
      name: cluster-proxy
      specHash: ""
    group: proxy.open-cluster-management.io
    lastObservedGeneration: 1
    name: cluster-proxy
    resource: managedproxyconfigurations

To resolve the issue, delete the ManagedClusterAddon by running the following command to reinstall and recover the ManagedClusterAddon. Replace <cluster-name> with the ManagedClusterAddon namespace. Replace <addon-name> with the ManagedClusterAddon name:

oc -n <cluster-name> delete managedclusteraddon <addon-name>

When creating OpenShift Container Platform clusters by using the infrastructure operator for Red Hat OpenShift, the file name of the ISO image might be too long. The long image name causes the image provisioning and the cluster provisioning to fail. To determine if this is the problem, complete the following steps:

If this problem occurs, it is typically on the following versions of OpenShift Container Platform, because the infrastructure operator for Red Hat OpenShift was not using image service:

To avoid this error, upgrade your OpenShift Container Platform to version 4.8.18 or later, or 4.9.7 or later.

You cannot use a host inventory, or InfraEnv custom resource, to both boot with the discovery image and add hosts automatically. If you used your previous InfraEnv resource for the BareMetalHost resource, and you want to boot the image yourself, you can work around the issue by creating a new InfraEnv resource.

If you want to install a single-node OpenShift cluster with an Red Hat OpenShift Container Platform version before 4.16, your InfraEnv custom resource and your booted host must use the same OpenShift Container Platform version that you are using to install the single-node OpenShift cluster. The installation fails if the versions do not match.

To work around the issue, edit your InfraEnv resource before you boot a host with the Discovery ISO, and include the following content:

apiVersion: agent-install.openshift.io/v1beta1
kind: InfraEnv
spec:
  osImageVersion: 4.15

The osImageVersion field must match the Red Hat OpenShift Container Platform cluster version that you want to install.

The tolerations and nodeSelector settings configured on the MultiClusterEngine and MultiClusterHub resources do not affect the managed-serviceaccount agent deployed on the local cluster. The managed-serviceaccount add-on is not always required on the local cluster.

If the managed-serviceaccount add-on is required, you can work around the issue by completing the following steps:

See Configuring nodeSelectors and tolerations for klusterlet add-ons to learn more about how to use the addonDeploymentConfig custom resource to configure tolerations and nodeSelector for add-ons.

If you remove the BareMetalHost resource from a hub cluster, the nodes shut down. You can manually power on the nodes again.

To create an Amazon Simple Storage Service (S3) secret, complete the following task from the console:

The YAML files referencing the release images are maintained in the acm-hive-openshift-releases GitHub repository. The files are used to create the list of the available release images in the console. This includes the latest fast channel images from OpenShift Container Platform.

The console only displays the latest release images for the three latest versions of OpenShift Container Platform. For example, you might see the following release image displayed in the console options:

quay.io/openshift-release-dev/ocp-release:4.15.1-x86_64

The console displays the latest versions to help you create a cluster with the latest release images. If you need to create a cluster that is a specific version, older release image versions are also available.

Note: You can only select images with the visible: 'true' label when creating clusters in the console. An example of this label in a ClusterImageSet resource is provided in the following content. Replace 4.x.1 with the current version of the product:

apiVersion: hive.openshift.io/v1
kind: ClusterImageSet
metadata:
  labels:
    channel: fast
    visible: 'true'
  name: img4.x.1-x86-64-appsub
spec:
  releaseImage: quay.io/openshift-release-dev/ocp-release:4.x.1-x86_64

Additional release images are stored, but are not visible in the console. To view all of the available release images, run the following command:

oc get clusterimageset

The repository has the clusterImageSets directory, which is the directory that you use when working with the release images. The clusterImageSets directory has the following directories:

You can configure your ClusterImageSets with the following options:

You can create a cluster on an architecture that is different from the architecture of the hub cluster by manually creating a release image that has the files for both architectures.

For example, you might need to create an x86_64 cluster from a hub cluster that is running on the ppc64le, aarch64, or s390x architecture. If you create the release image with both sets of files, the cluster creation succeeds because the new release image enables the OpenShift Container Platform release registry to provide a multi-architecture image manifest.

OpenShift Container Platform supports multiple architectures by default. You can use the following clusterImageSet to provision a cluster. Replace 4.x.0 with the current supported version:

apiVersion: hive.openshift.io/v1
kind: ClusterImageSet
metadata:
  labels:
    channel: fast
    visible: 'true'
  name: img4.x.0-multi-appsub
spec:
  releaseImage: quay.io/openshift-release-dev/ocp-release:4.x.0-multi

To create the release image for OpenShift Container Platform images that do not support multiple architectures, complete steps similar to the following example for your architecture type:

The creation process uses the merged release images to create the cluster.

Before creating a cluster, you must clone the clusterImageSets repository and apply it to your hub cluster. See the following steps:

Select the Red Hat OpenShift Container Platform release images when you create a cluster.

Note: If you use the Nutanix platform, be sure to use x86_64 architecture for the releaseImage in the ClusterImageSet resource and set the visible label value to 'true'. See the following example:

apiVersion: hive.openshift.io/v1
kind: ClusterImageSet
metadata:
  labels:
    channel: stable
    visible: 'true'
  name: img4.x.47-x86-64-appsub
spec:
  releaseImage: quay.io/openshift-release-dev/ocp-release:4.x.47-x86_64

A ClusterDeployment is a Hive custom resource that is used to control the lifecycle of a cluster.

Follow the Using Hive documentation to create the ClusterDeployment custom resource and create an individual cluster.

A ClusterPool is also a Hive custom resource that is used to create multiple clusters.

Follow the Cluster Pools documentation to create a cluster with the Hive ClusterPool API.

Add a reference to the ClusterDeployment resource that specifies a config map resource that contains the additional resource manifests.

Note: The ClusterDeployment resource and the config map must be in the same namespace.

If you want to configure additional manifests by using a config map with resource manifests, complete the following steps:

See the following prerequisites before creating a cluster on AWS:

See the following important information about creating an AWS cluster:

To create a new cluster, see the following procedure. If you have an existing cluster that you want to import instead, see Cluster import.

Note: You do not have to run the oc command that is provided with the cluster details to import the cluster. When you create the cluster, it is automatically configured under the management of multicluster engine operator.

If you need to create a credential, see Creating a credential for Amazon Web Services for more information.

The name of the cluster is used in the hostname of the cluster.

If you are using Red Hat Advanced Cluster Management for Kubernetes and want to configure your managed cluster klusterlet to run on specific nodes, see Optional: Configuring the klusterlet to run on specific nodes for the required steps.

You must have the following prerequisites before creating an AWS GovCloud cluster:

Note: If you change your cloud provider access key on the cloud provider, you also need to manually update the corresponding credential for the cloud provider on the multicluster engine operator console. This is required when your credentials expire on the cloud provider where the managed cluster is hosted and you try to delete the managed cluster.

While creating a cluster on AWS GovCloud is almost identical to creating a cluster on standard AWS, you have to complete some additional steps to prepare an AWS PrivateLink for the cluster on AWS GovCloud.

spec:
  awsPrivateLink:
    ## The list of inventory of VPCs that can be used to create VPC
    ## endpoints by the controller.
    endpointVPCInventory:
    - region: us-east-1
      vpcID: vpc-1
      subnets:
      - availabilityZone: us-east-1a
        subnetID: subnet-11
      - availabilityZone: us-east-1b
        subnetID: subnet-12
      - availabilityZone: us-east-1c
        subnetID: subnet-13
      - availabilityZone: us-east-1d
        subnetID: subnet-14
      - availabilityZone: us-east-1e
        subnetID: subnet-15
      - availabilityZone: us-east-1f
        subnetID: subnet-16
    - region: us-east-1
      vpcID: vpc-2
      subnets:
      - availabilityZone: us-east-1a
        subnetID: subnet-21
      - availabilityZone: us-east-1b
        subnetID: subnet-22
      - availabilityZone: us-east-1c
        subnetID: subnet-23
      - availabilityZone: us-east-1d
        subnetID: subnet-24
      - availabilityZone: us-east-1e
        subnetID: subnet-25
      - availabilityZone: us-east-1f
        subnetID: subnet-26
    ## The credentialsSecretRef points to a secret with permissions to create.
    ## The resources in the account where the inventory of VPCs exist.
    credentialsSecretRef:
      name: <hub-account-credentials-secret-name>

    ## A list of VPC where various mce clusters exists.
    associatedVPCs:
    - region: region-mce1
      vpcID: vpc-mce1
      credentialsSecretRef:
        name: <credentials-that-have-access-to-account-where-MCE1-VPC-exists>
    - region: region-mce2
      vpcID: vpc-mce2
      credentialsSecretRef:
        name: <credentials-that-have-access-to-account-where-MCE2-VPC-exists>

To create a cluster from the console, navigate to Infrastructure > Clusters > Create cluster AWS > Standalone and complete the steps in the console.

Note: This procedure is for creating a cluster. If you have an existing cluster that you want to import, see Cluster import for those steps.

The credential that you select must have access to the resources in an AWS GovCloud region, if you create an AWS GovCloud cluster. You can use an AWS GovCloud secret that is already in the Hive namespace if it has the required permissions to deploy a cluster. Existing credentials are displayed in the console. If you need to create a credential, see Creating a credential for Amazon Web Services for more information.

The name of the cluster is used in the hostname of the cluster.

Important: When you create a cluster, the controller creates a namespace for the cluster and its resources. Ensure that you include only resources for that cluster instance in that namespace. Destroying the cluster deletes the namespace and all of the resources in it.

Tip: Select YAML: On to view content updates as you enter the information in the console.

If you want to add your cluster to an existing cluster set, you must have the correct permissions on the cluster set to add it. If you do not have cluster-admin privileges when you are creating the cluster, you must select a cluster set on which you have clusterset-admin permissions. If you do not have the correct permissions on the specified cluster set, the cluster creation fails. Contact your cluster administrator to provide you with clusterset-admin permissions to a cluster set if you do not have any cluster set options to select.

Every managed cluster must be associated with a managed cluster set. If you do not assign the managed cluster to a ManagedClusterSet, it is automatically added to the default managed cluster set.

If there is already a base DNS domain that is associated with the selected credential that you configured with your AWS or AWS GovCloud account, that value is populated in the field. You can change the value by overwriting it. This name is used in the hostname of the cluster. See Configuring an AWS account for more information.

The release image identifies the version of the OpenShift Container Platform image that is used to create the cluster. If the version that you want to use is available, you can select the image from the list of images. If the image that you want to use is not a standard image, you can enter the URL to the image that you want to use. See Release images for more information about release images.

The node pools include the control plane pool and the worker pools. The control plane nodes share the management of the cluster activity. The information includes the following fields:

You can create zero or more worker nodes in a worker pool to run the container workloads for the cluster. They can be in a single worker pool, or distributed across multiple worker pools. If zero worker nodes are specified, the control plane nodes also function as worker nodes. The optional information includes the following fields:

Networking details are required for your cluster, and multiple networks are required for using IPv6. For an AWS GovCloud cluster, enter the values of the block of addresses of the Hive VPC in the Machine CIDR field. You can add an additional network by clicking Add network.

Proxy information that is provided in the credential is automatically added to the proxy fields. You can use the information as it is, overwrite it, or add the information if you want to enable a proxy. The following list contains the required information for creating a proxy:

When creating an AWS GovCloud cluster or using a private environment, complete the fields on the AWS private configuration page with the AMI ID and the subnet values. Ensure that the value of spec:platform:aws:privateLink:enabled is set to true in the ClusterDeployment.yaml file, which is automatically set when you select Use private configuration.

When you review your information and optionally customize it before creating the cluster, you can select YAML: On to view the install-config.yaml file content in the panel. You can edit the YAML file with your custom settings, if you have any updates.

Note: You do not have to run the oc command that is provided with the cluster details to import the cluster. When you create the cluster, it is automatically configured under the management of multicluster engine for Kubernetes operator.

If you are using Red Hat Advanced Cluster Management for Kubernetes and want to configure your managed cluster klusterlet to run on specific nodes, see Optional: Configuring the klusterlet to run on specific nodes for the required steps.

Continue with Accessing your cluster for instructions for accessing your cluster.

See the following prerequisites before creating a cluster on Azure:

Note: If you change your cloud provider access key on the cloud provider, you also need to manually update the corresponding credential for the cloud provider on the console of multicluster engine operator. This is required when your credentials expire on the cloud provider where the managed cluster is hosted and you try to delete the managed cluster.

To create a cluster from the multicluster engine operator console, navigate to Infrastructure > Clusters. On the Clusters page, click Create cluster and complete the steps in the console.

Note: This procedure is for creating a cluster. If you have an existing cluster that you want to import, see Cluster import for those steps.

If you need to create a credential, see Creating a credential for Microsoft Azure for more information.

The name of the cluster is used in the hostname of the cluster.

Important: When you create a cluster, the controller creates a namespace for the cluster and its resources. Ensure that you include only resources for that cluster instance in that namespace. Destroying the cluster deletes the namespace and all of the resources in it.

Tip: Select YAML: On to view content updates as you enter the information in the console.

If you want to add your cluster to an existing cluster set, you must have the correct permissions on the cluster set to add it. If you do not have cluster-admin privileges when you are creating the cluster, you must select a cluster set on which you have clusterset-admin permissions. If you do not have the correct permissions on the specified cluster set, the cluster creation fails. Contact your cluster administrator to provide you with clusterset-admin permissions to a cluster set if you do not have any cluster set options to select.

Every managed cluster must be associated with a managed cluster set. If you do not assign the managed cluster to a ManagedClusterSet, it is automatically added to the default managed cluster set.

If there is already a base DNS domain that is associated with the selected credential that you configured for your Azure account, that value is populated in that field. You can change the value by overwriting it. See Configuring a custom domain name for an Azure cloud service for more information. This name is used in the hostname of the cluster.

The release image identifies the version of the OpenShift Container Platform image that is used to create the cluster. If the version that you want to use is available, you can select the image from the list of images. If the image that you want to use is not a standard image, you can enter the URL to the image that you want to use. See Release images for more information about release images.

The Node pools include the control plane pool and the worker pools. The control plane nodes share the management of the cluster activity. The information includes the following optional fields:

You can change the type and size of the Instance type and Root storage allocation (required) of your control plane pool after your cluster is created.

You can create one or more worker nodes in a worker pool to run the container workloads for the cluster. They can be in a single worker pool, or distributed across multiple worker pools. If zero worker nodes are specified, the control plane nodes also function as worker nodes. The information includes the following fields:

You can add an additional network by clicking Add network. You must have more than one network if you are using IPv6 addresses.

Proxy information that is provided in the credential is automatically added to the proxy fields. You can use the information as it is, overwrite it, or add the information if you want to enable a proxy. The following list contains the required information for creating a proxy:

When you review your information and optionally customize it before creating the cluster, you can click the YAML switch On to view the install-config.yaml file content in the panel. You can edit the YAML file with your custom settings, if you have any updates.

If you are using Red Hat Advanced Cluster Management for Kubernetes and want to configure your managed cluster klusterlet to run on specific nodes, see Optional: Configuring the klusterlet to run on specific nodes for the required steps.

Note: You do not have to run the oc command that is provided with the cluster details to import the cluster. When you create the cluster, it is automatically configured under the management of multicluster engine operator.

Continue with Accessing your cluster for instructions for accessing your cluster.

See the following prerequisites before creating a cluster on GCP:

Note: If you change your cloud provider access key on the cloud provider, you also need to manually update the corresponding credential for the cloud provider on the console of multicluster engine operator. This is required when your credentials expire on the cloud provider where the managed cluster is hosted and you try to delete the managed cluster.

To create clusters from the multicluster engine operator console, navigate to Infrastructure > Clusters. On the Clusters page, click Create cluster and complete the steps in the console.

Note: This procedure is for creating a cluster. If you have an existing cluster that you want to import, see Cluster import for those steps.

If you need to create a credential, see Creating a credential for Google Cloud Platform for more information.

The name of your cluster is used in the hostname of the cluster. There are some restrictions that apply to naming your GCP cluster. These restrictions include not beginning the name with goog or containing a group of letters and numbers that resemble google anywhere in the name. See Bucket naming guidelines for the complete list of restrictions.

Important: When you create a cluster, the controller creates a namespace for the cluster and its resources. Ensure that you include only resources for that cluster instance in that namespace. Destroying the cluster deletes the namespace and all of the resources in it.

Tip: Select YAML: On to view content updates as you enter the information in the console.

If you want to add your cluster to an existing cluster set, you must have the correct permissions on the cluster set to add it. If you do not have cluster-admin privileges when you are creating the cluster, you must select a cluster set on which you have clusterset-admin permissions. If you do not have the correct permissions on the specified cluster set, the cluster creation fails. Contact your cluster administrator to provide you with clusterset-admin permissions to a cluster set if you do not have any cluster set options to select.

Every managed cluster must be associated with a managed cluster set. If you do not assign the managed cluster to a ManagedClusterSet, it is automatically added to the default managed cluster set.

If there is already a base DNS domain that is associated with the selected credential for your GCP account, that value is populated in the field. You can change the value by overwriting it. See Setting up a custom domain for more information. This name is used in the hostname of the cluster.

The release image identifies the version of the OpenShift Container Platform image that is used to create the cluster. If the version that you want to use is available, you can select the image from the list of images. If the image that you want to use is not a standard image, you can enter the URL to the image that you want to use. See Release images for more information about release images.

The Node pools include the control plane pool and the worker pools. The control plane nodes share the management of the cluster activity. The information includes the following fields:

You can specify the instance type of your control plane pool. You can change the type and size of your instance after it is created.

You can create one or more worker nodes in a worker pool to run the container workloads for the cluster. They can be in a single worker pool, or distributed across multiple worker pools. If zero worker nodes are specified, the control plane nodes also function as worker nodes. The information includes the following fields:

The networking details are required, and multiple networks are required for using IPv6 addresses. You can add an additional network by clicking Add network.

Proxy information that is provided in the credential is automatically added to the proxy fields. You can use the information as it is, overwrite it, or add the information if you want to enable a proxy. The following list contains the required information for creating a proxy:

When you review your information and optionally customize it before creating the cluster, you can select YAML: On to view the install-config.yaml file content in the panel. You can edit the YAML file with your custom settings, if you have any updates.

If you are using Red Hat Advanced Cluster Management for Kubernetes and want to configure your managed cluster klusterlet to run on specific nodes, see Optional: Configuring the klusterlet to run on specific nodes for the required steps.

Note: You do not have to run the oc command that is provided with the cluster details to import the cluster. When you create the cluster, it is automatically configured under the management of multicluster engine operator.

Continue with Accessing your cluster for instructions for accessing your cluster.

See the following prerequisites before creating a cluster on vSphere:

To create a cluster from the multicluster engine operator console, navigate to Infrastructure > Clusters. On the Clusters page, click Create cluster and complete the steps in the console.

Note: This procedure is for creating a cluster. If you have an existing cluster that you want to import, see Cluster import for those steps.

If you need to create a credential, see Creating a credential for VMware vSphere for more information about creating a credential.

The name of your cluster is used in the hostname of the cluster.

Important: When you create a cluster, the controller creates a namespace for the cluster and its resources. Ensure that you include only resources for that cluster instance in that namespace. Destroying the cluster deletes the namespace and all of the resources in it.

Tip: Select YAML: On to view content updates as you enter the information in the console.

If you want to add your cluster to an existing cluster set, you must have the correct permissions on the cluster set to add it. If you do not have cluster-admin privileges when you are creating the cluster, you must select a cluster set on which you have clusterset-admin permissions. If you do not have the correct permissions on the specified cluster set, the cluster creation fails. Contact your cluster administrator to provide you with clusterset-admin permissions to a cluster set if you do not have any cluster set options to select.

Every managed cluster must be associated with a managed cluster set. If you do not assign the managed cluster to a ManagedClusterSet, it is automatically added to the default managed cluster set.

If there is already a base domain associated with the selected credential that you configured for your vSphere account, that value is populated in the field. You can change the value by overwriting it. See Installing a cluster on vSphere with customizations for more information. This value must match the name that you used to create the DNS records listed in the prerequisites section. This name is used in the hostname of the cluster.

The release image identifies the version of the OpenShift Container Platform image that is used to create the cluster. If the version that you want to use is available, you can select the image from the list of images. If the image that you want to use is not a standard image, you can enter the URL to the image that you want to use. See Release images for more information about release images.

Note: Release images for OpenShift Container Platform versions 4.15 and later are supported.

The node pools include the control plane pool and the worker pools. The control plane nodes share the management of the cluster activity. The information includes the CPU architecture field. View the following field description:

You can create one or more worker nodes in a worker pool to run the container workloads for the cluster. They can be in a single worker pool, or distributed across multiple worker pools. If zero worker nodes are specified, the control plane nodes also function as worker nodes. The information includes Cores per socket, CPUs, Memory_min MiB, _Disk size in GiB, and Node count.

Networking information is required. Multiple networks are required for using IPv6. Some of the required networking information is included the following fields:

You can add an additional network by clicking Add network. You must have more than one network if you are using IPv6 addresses.

Proxy information that is provided in the credential is automatically added to the proxy fields. You can use the information as it is, overwrite it, or add the information if you want to enable a proxy. The following list contains the required information for creating a proxy:

You can define the disconnected installation image by clicking Disconnected installation. When creating a cluster by using Red Hat OpenStack Platform provider and disconnected installation, if a certificate is required to access the mirror registry, you must enter it in the Additional trust bundle field in the Configuration for disconnected installation section when configuring your credential or the Disconnected installation section when creating a cluster.

You can click Add automation template to create a template.

When you review your information and optionally customize it before creating the cluster, you can click the YAML switch On to view the install-config.yaml file content in the panel. You can edit the YAML file with your custom settings, if you have any updates.

If you are using Red Hat Advanced Cluster Management for Kubernetes and want to configure your managed cluster klusterlet to run on specific nodes, see Optional: Configuring the klusterlet to run on specific nodes for the required steps.

Note: You do not have to run the oc command that is provided with the cluster details to import the cluster. When you create the cluster, it is automatically configured under the management of multicluster engine operator.

Continue with Accessing your cluster for instructions for accessing your cluster.

See the following prerequisites before creating a cluster on Red Hat OpenStack Platform:

To create a cluster from the multicluster engine operator console, navigate to Infrastructure > Clusters. On the Clusters page, click Create cluster and complete the steps in the console.

Note: This procedure is for creating a cluster. If you have an existing cluster that you want to import, see Cluster import for those steps.

If you need to create a credential, see Creating a credential for Red Hat OpenStack Platform for more information.

The name of the cluster is used in the hostname of the cluster. The name must contain fewer than 15 characters. This value must match the name that you used to create the DNS records listed in the credential prerequisites section.

Important: When you create a cluster, the controller creates a namespace for the cluster and its resources. Ensure that you include only resources for that cluster instance in that namespace. Destroying the cluster deletes the namespace and all of the resources in it.

Tip: Select YAML: On to view content updates as you enter the information in the console.

If you want to add your cluster to an existing cluster set, you must have the correct permissions on the cluster set to add it. If you do not have cluster-admin privileges when you are creating the cluster, you must select a cluster set on which you have clusterset-admin permissions. If you do not have the correct permissions on the specified cluster set, the cluster creation fails. Contact your cluster administrator to provide you with clusterset-admin permissions to a cluster set if you do not have any cluster set options to select.

Every managed cluster must be associated with a managed cluster set. If you do not assign the managed cluster to a ManagedClusterSet, it is automatically added to the default managed cluster set.

If there is already a base DNS domain that is associated with the selected credential that you configured for your Red Hat OpenStack Platform account, that value is populated in the field. You can change the value by overwriting it. See Managing domains in the Red Hat OpenStack Platform documentation for more information. This name is used in the hostname of the cluster.

The release image identifies the version of the OpenShift Container Platform image that is used to create the cluster. If the version that you want to use is available, you can select the image from the list of images. If the image that you want to use is not a standard image, you can enter the URL to the image that you want to use. See Release images for more information about release images. Only release images for OpenShift Container Platform versions 4.6.x and higher are supported.

The node pools include the control plane pool and the worker pools. The control plane nodes share the management of the cluster activity. If the architecture type of the managed cluster is not the same as the architecture of your hub cluster, enter a value for the instruction set architecture of the machines in the pool. Valid values are amd64, ppc64le, s390x, and arm64.

You must add an instance type for your control plane pool, but you can change the type and size of your instance after it is created.

You can create one or more worker nodes in a worker pool to run the container workloads for the cluster. They can be in a single worker pool, or distributed across multiple worker pools. If zero worker nodes are specified, the control plane nodes also function as worker nodes. The information includes the following fields:

Networking details are required for your cluster. You must provide the values for one or more networks for an IPv4 network. For an IPv6 network, you must define more than one network.

You can add an additional network by clicking Add network. You must have more than one network if you are using IPv6 addresses.

Proxy information that is provided in the credential is automatically added to the proxy fields. You can use the information as it is, overwrite it, or add the information if you want to enable a proxy. The following list contains the required information for creating a proxy:

You can define the disconnected installation image by clicking Disconnected installation. When creating a cluster by using Red Hat OpenStack Platform provider and disconnected installation, if a certificate is required to access the mirror registry, you must enter it in the Additional trust bundle field in the Configuration for disconnected installation section when configuring your credential or the Disconnected installation section when creating a cluster.

When you review your information and optionally customize it before creating the cluster, you can click the YAML switch On to view the install-config.yaml file content in the panel. You can edit the YAML file with your custom settings, if you have any updates.

When creating a cluster that uses an internal certificate authority (CA), you need to customize the YAML file for your cluster by completing the following steps:

If you are using Red Hat Advanced Cluster Management for Kubernetes and want to configure your managed cluster klusterlet to run on specific nodes, see Optional: Configuring the klusterlet to run on specific nodes for the required steps.

Note: You do not have to run the oc command that is provided with the cluster details to import the cluster. When you create the cluster, it is automatically configured under the management of multicluster engine operator.

Continue with Accessing your cluster for instructions for accessing your cluster.

See the following prerequisites before creating a cluster in an on-premises environment:

To create a cluster from the console, complete the following steps:

The following options are available for your assisted installation:

If you need to create a credential, see Creating a credential for an on-premises environment for more information.

The name for your cluster is used in the hostname of the cluster.

Important: When you create a cluster, the controller creates a namespace for the cluster and its resources. Ensure that you include only resources for that cluster instance in that namespace. Destroying the cluster deletes the namespace and all of the resources in it.

Note: Select YAML: On to view content updates as you enter the information in the console.

If you want to add your cluster to an existing cluster set, you must have the correct permissions on the cluster set to add it. If you do not have cluster-admin privileges when you are creating the cluster, you must select a cluster set on which you have clusterset-admin permissions. If you do not have the correct permissions on the specified cluster set, the cluster creation fails. Contact your cluster administrator to provide you with clusterset-admin permissions to a cluster set if you do not have any cluster set options to select.

Every managed cluster must be associated with a managed cluster set. If you do not assign the managed cluster to a ManagedClusterSet, it is automatically added to the default managed cluster set.

If there is already a base DNS domain that is associated with the selected credential that you configured for your provider account, that value is populated in that field. You can change the value by overwriting it, but this setting cannot be changed after the cluster is created. The base domain of your provider is used to create routes to your Red Hat OpenShift Container Platform cluster components. It is configured in the DNS of your cluster provider as a Start of Authority (SOA) record.

The OpenShift version identifies the version of the OpenShift Container Platform image that is used to create the cluster. If the version that you want to use is available, you can select the image from the list of images. If the image that you want to use is not a standard image, you can enter the URL to the image that you want to use. See Release images to learn more.

When you select a supported OpenShift Container Platform version, an option to select Install single-node OpenShift is displayed. A single-node OpenShift cluster contains a single node which hosts the control plane services and the user workloads. See Scaling hosts to an infrastructure environment to learn more about adding nodes to a single-node OpenShift cluster after it is created.

If you want your cluster to be a single-node OpenShift cluster, select the single-node OpenShift option. You can add additional workers to single-node OpenShift clusters by completing the following steps:

Note: The single-node OpenShift control plane requires 8 CPU cores, while a control plane node for a multinode control plane cluster only requires 4 CPU cores.

After you review and save the cluster, your cluster is saved as a draft cluster. You can close the creation process and finish the process later by selecting the cluster name on the Clusters page.

If you are using existing hosts, select whether you want to select the hosts yourself, or if you want them to be selected automatically. The number of hosts is based on the number of nodes that you selected. For example, a single-node OpenShift cluster only requires one host, while a standard three-node cluster requires three hosts.

The locations of the available hosts that meet the requirements for this cluster are displayed in the list of Host locations. For distribution of the hosts and a more high-availability configuration, select multiple locations.

If you are discovering new hosts with no existing infrastructure environment, complete the steps in Adding hosts to the host inventory by using the Discovery Image.

After the hosts are bound, and the validations pass, complete the networking information for your cluster by adding the following IP addresses:

If you are using Red Hat Advanced Cluster Management for Kubernetes and want to configure your managed cluster klusterlet to run on specific nodes, see Optional: Configuring the klusterlet to run on specific nodes for the required steps.

You can view the status of the installation on the Clusters navigation page.

Continue with Accessing your cluster for instructions for accessing your cluster.

You can also create a cluster without the console by using the Assisted Installer feature within the central infrastructure management component. After you complete this procedure, you can boot the host from the discovery image that is generated. The order of the procedures is generally not important, but is noted when there is a required order.

apiVersion: v1
kind: Namespace
metadata:
  name: sample-namespace

apiVersion: v1
kind: Secret
type: kubernetes.io/dockerconfigjson
metadata:
  name: <pull-secret>
  namespace: sample-namespace
stringData:
  .dockerconfigjson: 'your-pull-secret-json' 1

apiVersion: hive.openshift.io/v1
kind: ClusterImageSet
metadata:
  name: openshift-v4.15.0
spec:
  releaseImage: quay.io/openshift-release-dev/ocp-release:4.15.0-rc.0-x86_64

apiVersion: hive.openshift.io/v1
kind: ClusterDeployment
metadata:
  name: single-node
  namespace: demo-worker4
spec:
  baseDomain: hive.example.com
  clusterInstallRef:
    group: extensions.hive.openshift.io
    kind: AgentClusterInstall
    name: test-agent-cluster-install 1
    version: v1beta1
  clusterName: test-cluster
  controlPlaneConfig:
    servingCertificates: {}
  platform:
    agentBareMetal:
      agentSelector:
        matchLabels:
          location: internal
  pullSecretRef:
    name: <pull-secret> 2

apiVersion: extensions.hive.openshift.io/v1beta1
kind: AgentClusterInstall
metadata:
  name: test-agent-cluster-install
  namespace: demo-worker4
spec:
  platformType: BareMetal 1
  clusterDeploymentRef:
    name: single-node 2
  imageSetRef:
    name: openshift-v4.15.0 3
  networking:
    clusterNetwork:
    - cidr: 10.128.0.0/14
      hostPrefix: 23
    machineNetwork:
    - cidr: 192.168.111.0/24
    serviceNetwork:
    - 172.30.0.0/16
  provisionRequirements:
    controlPlaneAgents: 1
  sshPublicKey: ssh-rsa <your-public-key-here> 4

apiVersion: agent-install.openshift.io/v1beta1
kind: NMStateConfig
metadata:
  name: <mynmstateconfig>
  namespace: <demo-worker4>
  labels:
    demo-nmstate-label: <value>
spec:
  config:
    interfaces:
      - name: eth0
        type: ethernet
        state: up
        mac-address: 02:00:00:80:12:14
        ipv4:
          enabled: true
          address:
            - ip: 192.168.111.30
              prefix-length: 24
          dhcp: false
      - name: eth1
        type: ethernet
        state: up
        mac-address: 02:00:00:80:12:15
        ipv4:
          enabled: true
          address:
            - ip: 192.168.140.30
              prefix-length: 24
          dhcp: false
    dns-resolver:
      config:
        server:
          - 192.168.126.1
    routes:
      config:
        - destination: 0.0.0.0/0
          next-hop-address: 192.168.111.1
          next-hop-interface: eth1
          table-id: 254
        - destination: 0.0.0.0/0
          next-hop-address: 192.168.140.1
          next-hop-interface: eth1
          table-id: 254
  interfaces:
    - name: "eth0"
      macAddress: "02:00:00:80:12:14"
    - name: "eth1"
      macAddress: "02:00:00:80:12:15"

apiVersion: agent-install.openshift.io/v1beta1
kind: InfraEnv
metadata:
  name: myinfraenv
  namespace: demo-worker4
spec:
  clusterRef:
    name: single-node  1
    namespace: demo-worker4 2
  pullSecretRef:
    name: pull-secret
  sshAuthorizedKey: <your_public_key_here>
  nmStateConfigLabelSelector:
    matchLabels:
      demo-nmstate-label: value
  proxy:
    httpProxy: http://USERNAME:PASSWORD@proxy.example.com:PORT
    httpsProxy: https://USERNAME:PASSWORD@proxy.example.com:PORT
    noProxy: .example.com,172.22.0.0/24,10.10.0.0/24

To configure the AgentClusterInstall proxy, add the proxy settings to the AgentClusterInstall resource. See the following YAML sample with httpProxy, httpsProxy, and noProxy:

apiVersion: extensions.hive.openshift.io/v1beta1
kind: AgentClusterInstall
spec:
  proxy:
    httpProxy: http://<username>:<password>@<proxy.example.com>:<port> 1
    httpsProxy: https://<username>:<password>@<proxy.example.com>:<port> 2
    noProxy: <wildcard-of-domain>,<provisioning-network/CIDR>,<BMC-address-range/CIDR> 3

Required user type or access level: Cluster administrator

If you need to create a new pull secret, complete the following steps:

You can import existing clusters from the console for each of the available cloud providers.

Note: A hub cluster cannot manage a different hub cluster. A hub cluster is set up to automatically import and manage itself, so you do not have to manually import a hub cluster to manage itself.

By default, the namespace is used for the cluster name and namespace, but you can change it.

Important: When you create a cluster, the controller creates a namespace for the cluster and its resources. Ensure that you include only resources for that cluster instance in that namespace. Destroying the cluster deletes the namespace and all of the resources in it.

Every managed cluster must be associated with a managed cluster set. If you do not assign the managed cluster to a ManagedClusterSet, the cluster is automatically added to the default managed cluster set.

If you want to add the cluster to a different cluster set, you must have clusterset-admin privileges to the cluster set. If you do not have cluster-admin privileges when you are importing the cluster, you must select a cluster set on which you have clusterset-admin permissions. If you do not have the correct permissions on the specified cluster set, the cluster importing fails. Contact your cluster administrator to provide you with clusterset-admin permissions to a cluster set if you do not have cluster set options to select.

If you import a OpenShift Container Platform Dedicated cluster and do not specify a vendor by adding a label for vendor=OpenShiftDedicated, or if you add a label for vendor=auto-detect, a managed-by=platform label is automatically added to the cluster. You can use this added label to identify the cluster as a OpenShift Container Platform Dedicated cluster and retrieve the OpenShift Container Platform Dedicated clusters as a group.

The following table provides the available options for import mode, which specifies the method for importing the cluster:

Note: You must have the Red Hat Ansible Automation Platform Resource Operator installed from OperatorHub to create and run an Ansible Automation Platform job.

To configure a cluster API address, see Optional: Configuring the cluster API address.

To configure your managed cluster klusterlet to run on specific nodes, see Optional: Configuring the klusterlet to run on specific nodes.

Complete the following procedure to remove an imported cluster and the open-cluster-management-agent-addon that was created on the managed cluster.

On the Clusters page, click Actions > Detach cluster to remove your cluster from management.

Note: If you attempt to detach the hub cluster, which is named local-cluster, be aware that the default setting of disableHubSelfManagement is false. This setting causes the hub cluster to reimport itself and manage itself when it is detached and it reconciles the MultiClusterHub controller. It might take hours for the hub cluster to complete the detachment process and reimport. If you want to reimport the hub cluster without waiting for the processes to finish, you can run the following command to restart the multiclusterhub-operator pod and reimport faster:

oc delete po -n open-cluster-management `oc get pod -n open-cluster-management | grep multiclusterhub-operator| cut -d' ' -f1`

You can change the value of the hub cluster to not import automatically by changing the disableHubSelfManagement value to true. For more information, see the disableHubSelfManagement topic.

Before importing a managed cluster by using the CLI, you must complete the following steps:

You can now continue with either Importing the cluster by using the auto import secret or Importing the cluster manually.

To import a managed cluster by using the auto import secret, you must create a secret that contains either a reference to the kubeconfig file of the cluster, or the kube API server and token pair of the cluster. Complete the following steps to import a cluster by using the auto import secret:

You can now continue with Importing the klusterlet add-on.

Important: The import command contains pull secret information that is copied to each of the imported managed clusters. Anyone who can access the imported clusters can also view the pull secret information.

Complete the following steps to import a managed cluster manually:

You can now continue with Importing the klusterlet add-on.

Implement the KlusterletAddonConfig klusterlet add-on configuration to enable other add-ons on your managed clusters. Create and apply the configuration file by completing the following steps:

To remove a managed cluster by using the command line interface, run the following command:

oc delete managedcluster <cluster_name>

Replace <cluster_name> with the name of the cluster.

To import a managed cluster by using the agent registration endpoint, complete the following steps:

Complete the following steps to import an OpenShift Container Platform cluster manually, without a static network or a bare metal host, and prepare it for adding nodes:

If your OpenShift Container Platform managed cluster was installed by the Assisted Installer, you can move the managed cluster and its resources from one hub cluster to another hub cluster.

You can manage a cluster from a new hub cluster by saving a copy of the original resources, applying them to the new hub cluster, and deleting the original resources. You can then scale down or scale up your managed cluster from the new hub cluster.

Important: You can only scale down imported OpenShift Container Platform managed clusters if they were installed by the Assisted Installer.

You can import the following resources and continue to manage your cluster with them:

Complete the following steps to import a cluster that is customized with a ManagedClusterImageRegistry custom resource definition:

Configuring autoscaling provides the flexibility of your cluster to scale as needed to lower your cost of resources by scaling down when traffic is low, and by scaling up to ensure that there are enough resources when there is a higher demand for resources.

You can disable autoscaling by using the console or the command line.

You can scale manually from the console and from the command line.

You must have the new CA certificates required to trust the managed cluster API.

Before adding production environment worker nodes to OpenShift Container Platform clusters, you must check if you have a valid kubeconfig.

If the API certificates in your managed cluster changed, complete the following steps to update the kubeconfig with new CA certificates:

If you have a valid kubeconfig, complete the following steps to add production environment worker nodes to OpenShift Container Platform clusters:

Wait for the installation of the worker node. When the worker node installation is complete, the worker node contacts the managed cluster with a Certificate Signing Request (CSR) to start the joining process. The CSR is automatically signed.

Complete the following steps to add control plane nodes to healthy managed clusters:

Complete the following steps to add control plane nodes to unhealthy managed clusters:

You must have the following prerequisites before you can use OpenShift Update Service to upgrade your disconnected clusters:

You must mirror both the image that you want to upgrade to and the current image that you are upgrading from to your local mirror registry. Complete the following steps to mirror the images:

To deploy the operator for OpenShift Update Service in your OpenShift Container Platform environment, complete the following steps:

OpenShift Update Service uses graph data information to determine the available upgrades. In a connected environment, OpenShift Update Service pulls the graph data information for available upgrades directly from the Cincinnati graph data GitHub repository. Because you are configuring a disconnected environment, you must make the graph data available in a local repository by using an init container. Complete the following steps to create a graph data init container:

If you are using a secure external container registry to store your mirrored OpenShift Container Platform release images, OpenShift Update Service requires access to this registry to build an upgrade graph. Complete the following steps to configure your CA certificate to work with the OpenShift Update Service pod:

The OpenShift Update Service Operator watches the image.config.openshift.io API and the ConfigMap you created in the openshift-config namespace for changes, then restart the deployment if the CA cert has changed.

When you finish deploying the OpenShift Update Service instance on your hub cluster, this instance is located where the images for the cluster upgrades are mirrored and made available to the disconnected managed cluster. Complete the following steps to deploy the instance:

Note: The steps in this section only apply if you have mirrored your releases into your mirrored registry.

OpenShift Container Platform has a default image registry value that specifies where it finds the upgrade packages. In a disconnected environment, you can create an override to replace that value with the path to your local image registry where you mirrored your release images.

Complete the following steps to override the default registry:

On the managed cluster, disable all of the default catalog sources and create a new one. Complete the following steps to change the default location from a connected location to your disconnected local registry:

Update the ClusterVersion resource information on the managed cluster to change the default location from where it retrieves its upgrades.

On the Clusters page, the Distribution version of the cluster indicates that there is an upgrade available, if there is an upgrade in the disconnected registry. You can view the available upgrades by selecting the cluster and selecting Upgrade clusters from the Actions menu. If the optional upgrade paths are available, the available upgrades are listed.

Note: No available upgrade versions are shown if the current version is not mirrored into the local image repository.

You can use the console to select a channel for your cluster upgrades on OpenShift Container Platform version 4.6 or later. Those versions must be available on the mirror registry. Complete the steps in Selecting a channel to specify a channel for your upgrades.

After you configure the disconnected registry, multicluster engine operator and OpenShift Update Service use the disconnected registry to determine if upgrades are available. If no available upgrades are displayed, make sure that you have the release image of the current level of the cluster and at least one later level mirrored in the local repository. If the release image for the current version of the cluster is not available, no upgrades are available.

On the Clusters page, the Distribution version of the cluster indicates that there is an upgrade available, if there is an upgrade in the disconnected registry. You can upgrade the image by clicking Upgrade available and selecting the version for the upgrade.

The managed cluster is updated to the selected version.

If your cluster upgrade fails, the Operator generally retries the upgrade a few times, stops, and reports the status of the failing component. In some cases, the upgrade process continues to cycle through attempts to complete the process. Rolling your cluster back to a previous version following a failed upgrade is not supported. Contact Red Hat support for assistance if your cluster upgrade fails.