Manually importing a hosted cluster | Hosted control planes

Limitations of managing imported hosted clusters
Manually importing hosted clusters
Manually importing a hosted cluster on AWS
Disabling the automatic import of hosted clusters into multicluster engine Operator

Hosted clusters are automatically imported into multicluster engine Operator after the hosted control plane becomes available.

Limitations of managing imported hosted clusters

Hosted clusters are automatically imported into the local multicluster engine for Kubernetes Operator, unlike a standalone OKD or third-party clusters. Hosted clusters run some of their agents in the hosted mode so that the agents do not use the resources of your cluster.

If you choose to automatically import hosted clusters, you can update node pools and the control plane in hosted clusters by using the HostedCluster resource on the management cluster. To update node pools and a control plane, see "Updating node pools in a hosted cluster" and "Updating a control plane in a hosted cluster".

You can import hosted clusters into a location other than the local multicluster engine Operator by using the Red Hat Advanced Cluster Management (RHACM). For more information, see "Discovering multicluster engine for Kubernetes Operator hosted clusters in Red Hat Advanced Cluster Management".

In this topology, you must update your hosted clusters by using the command-line interface or the console of the local multicluster engine for Kubernetes Operator where the cluster is hosted. You cannot update the hosted clusters through the RHACM hub cluster.

Additional resources

Manually importing hosted clusters

Typically, hosted clusters are automatically imported to multicluster engine Operator after the hosted control plane becomes available. However, you can import hosted clusters manually as required.

Procedure

In the console, click Infrastructure → Clusters and select the hosted cluster that you want to import.

Click Import hosted cluster.

For your discovered hosted cluster, you can also import from the console, but the cluster must be in an upgradeable state. Import on your cluster is disabled if the hosted cluster is not in an upgradeable state because the hosted control plane is not available. Click Import to begin the process. The status is Importing while the cluster receives updates and then changes to Ready.

Manually importing a hosted cluster on AWS

You can import a hosted cluster on Amazon Web Services (AWS) with the command-line interface.

Procedure

Create your ManagedCluster resource by using the following sample YAML file:

apiVersion: cluster.open-cluster-management.io/v1
kind: ManagedCluster
metadata:
  annotations:
    import.open-cluster-management.io/hosting-cluster-name: local-cluster
    import.open-cluster-management.io/klusterlet-deploy-mode: Hosted
    open-cluster-management/created-via: hypershift
  labels:
    cloud: auto-detect
    cluster.open-cluster-management.io/clusterset: default
    name: <hosted_cluster_name>
    vendor: OpenShift
  name: <hosted_cluster_name>
spec:
  hubAcceptsClient: true
  leaseDurationSeconds: 60

Replace <hosted_cluster_name> with the name of your hosted cluster.

Run the following command to apply the resource:
```
$ oc apply -f <file_name>
```
Replace <file_name> with the YAML file name you created in the previous step.

If you have Red Hat Advanced Cluster Management installed, create your KlusterletAddonConfig resource by using the following sample YAML file. If you have installed multicluster engine Operator only, skip this step:

apiVersion: agent.open-cluster-management.io/v1
kind: KlusterletAddonConfig
metadata:
  name: <hosted_cluster_name>
  namespace: <hosted_cluster_namespace>
spec:
  clusterName: <hosted_cluster_name>
  clusterNamespace: <hosted_cluster_namespace>
  clusterLabels:
    cloud: auto-detect
    vendor: auto-detect
  applicationManager:
    enabled: true
  certPolicyController:
    enabled: true
  iamPolicyController:
    enabled: true
  policyController:
    enabled: true
  searchCollector:
    enabled: false

Replace <hosted_cluster_name> with the name of your hosted cluster.
Replace <hosted_cluster_namespace> with the name of your hosted cluster namespace.

Run the following command to apply the resource:
```
$ oc apply -f <file_name>
```
Replace <file_name> with the name of the YAML that you created in the previous step.
After the import process is complete, your hosted cluster becomes visible in the console. You can also check the status of your hosted cluster by running the following command:
```
$ oc get managedcluster <hosted_cluster_name>
```

Disabling the automatic import of hosted clusters into multicluster engine Operator

Hosted clusters are automatically imported into multicluster engine Operator after the control plane becomes available. If needed, you can disable the automatic import of hosted clusters.

Any hosted clusters that were previously imported are not affected, even if you disable automatic import. When you upgrade to multicluster engine Operator 2.5 and automatic import is enabled, all hosted clusters that are not imported are automatically imported if their control planes are available.

If Red Hat Advanced Cluster Management is installed, all Red Hat Advanced Cluster Management add-ons are also enabled.

When automatic import is disabled, only newly created hosted clusters are not automatically imported. Hosted clusters that were already imported are not affected. You can still manually import clusters by using the console or by creating the ManagedCluster and KlusterletAddonConfig custom resources.

Procedure

On the hub cluster, open the hypershift-addon-deploy-config specification that is in the AddonDeploymentConfig resource in the namespace where multicluster engine Operator is installed by entering the following command:
```
$ oc edit addondeploymentconfig hypershift-addon-deploy-config \
  -n multicluster-engine
```

In the spec.customizedVariables section, add the autoImportDisabled variable with value of "true", as shown in the following example:

apiVersion: addon.open-cluster-management.io/v1alpha1
kind: AddOnDeploymentConfig
metadata:
  name: hypershift-addon-deploy-config
  namespace: multicluster-engine
spec:
  customizedVariables:
   - name: hcMaxNumber
     value: "80"
  - name: hcThresholdNumber
    value: "60"
  - name: autoImportDisabled
    value: "true"

To re-enable automatic import, set the value of the autoImportDisabled variable to "false" or remove the variable from the AddonDeploymentConfig resource.