8.2. Importing a managed cluster with the CLI

After you install Red Hat Advanced Cluster Management for Kubernetes, you are ready to import a cluster to manage. You can import from both the console and the CLI. Follow this procedure to import from the CLI.

注意

A hub cluster cannot manage another hub cluster.

8.2.1. Prerequisites

  • You need a Red Hat Advanced Cluster Management for Kubernetes hub cluster that is deployed. If you are importing bare metal clusters, you must have the hub cluster installed on Red Hat OpenShift Container Platform version 4.4, or later. Important: The bare metal function is a technology preview, and should not be used in production enviromnents.
  • You need a separate cluster that you want to manage and Internet connectivity.
  • You need the Red Hat OpenShift Container Platform CLI version 4.3, or later, to run oc commands. See Getting started with the CLI for information about installing and configuring the Red Hat OpenShift CLI, oc.

  • You need to install the Kubernetes CLI, kubectl. To install kubectl, see Install and Set Up kubectl in the Kubernetes documentation.

    注意

    Download the installation file for CLI tools from the console.

8.2.2. Supported architecture

  • Linux
  • macOS

8.2.3. Prepare for import

  1. Log in to your hub cluster. Run the following command: 

    oc login

  2. Run the following command on the hub cluster to create the namespace. Note: The cluster name that is defined in <cluster_name> is also used as the cluster namespace in the .yaml file file and commands: 

    oc new-project ${CLUSTER_NAME}
oc label namespace ${CLUSTER_NAME} cluster.open-cluster-management.io/managedCluster=${CLUSTER_NAME}

  3. Edit the example ManagedCluster with the following sample of YAML: 

    apiVersion: cluster.open-cluster-management.io/v1
kind: ManagedCluster
metadata:
  name: <cluster_name>
spec:
  hubAcceptsClient: true
  4. Save the file as managed-cluster.yaml.

  5. Apply the YAML file with the following command: 

    oc apply -f managed-cluster.yaml

  6. Create the klusterlet addon configuration file. Enter the following example YAML: 

    apiVersion: agent.open-cluster-management.io/v1
kind: KlusterletAddonConfig
metadata:
  name: <cluster_name>
  namespace: <cluster_name>
spec:
  clusterName: <cluster_name>
  clusterNamespace: <cluster_name>
  applicationManager:
    enabled: true
  certPolicyController:
    enabled: true
  clusterLabels:
    cloud: auto-detect
    vendor: auto-detect
  iamPolicyController:
    enabled: true
  policyController:
    enabled: true
  searchCollector:
    enabled: true
  version: 2.0.0
  7. Save the file as klusterlet-addon-config.yaml.

  8. Apply the YAML. Run the following command: 

    oc apply -f klusterlet-addon-config.yaml

The ManagedCluster-Import-Controller will generate a secret named ${CLUSTER_NAME}-import. The ${CLUSTER_NAME}-import secret contains the import.yaml that the user applies to a managed cluster to install klusterlet.

8.2.4. Importing the klusterlet

重要

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

  1. Obtain the klusterlet-crd.yaml that was generated by the managed cluster import controller.

    Run the following command: 

    oc get secret ${CLUSTER_NAME}-import -n ${CLUSTER_NAME} -o jsonpath={.data.crds\\.yaml} | base64 --decode > klusterlet-crd.yaml

  2. Obtain the import.yaml that was generated by the managed cluster import controller. Run the following command: 

    oc get secret ${CLUSTER_NAME}-import -n ${CLUSTER_NAME} -o jsonpath={.data.import\\.yaml} | base64 --decode > import.yaml
  3. Log in to your target managed cluster.

  4. Apply the klusterlet-crd.yaml that was generated in step 1. Run the following command: 

    kubectl apply -f klusterlet-crd.yaml

  5. Apply the import.yaml file that was generated in step 2. Run the following command: 

    kubectl apply -f import.yaml

  6. Validate the pod status on the target managed cluster. Run the following command: 

    kubectl get pod -n open-cluster-management-agent

  7. Validate JOINED and AVAILABLE status for your imported cluster. Run the following command from the hub cluster: 

    kubectl get managedcluster -n ${CLUSTER_NAME}

  8. Addons will be installed after the managed cluster is AVAILABLE. Validate the pod status of addons on the target managed cluster. Run the following command: 

    kubectl get pod -n open-cluster-management-agent-addon