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import-installed-cluster.md

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Import Installed Cluster

It is possible to import an existing installed OpenShift in order to be able to add more workers to it. (Day 2 operation)

CRDs

Here are the needed CRDs to import an existing cluster:

InfraEnv

NMState Config

Optional network configuration.

Pull Secret

Cluster Image Set

AgentClusterInstall

Configure the number of control planes in the provisionRequirements field to be greater than 1. This is needed because adding additional nodes to a Single Node OpenShift is not currently supported.

ClusterDeployment

The differences from the Day 1 ClusterDeployment example are the installed field that is set to true and the clusterMetadata section as described below:

  • The adminKubeconfigSecretRef is a reference to a secret containing the kubeconfig. Here is how to create it (replace /path/to/kubeconfig to the location of the kubeconfig file):
kubectl -n spoke-cluster create secret generic test-cluster-admin-kubeconfig --from-file=kubeconfig=/path/to/kubeconfig
  • The adminPasswordSecretRef is a reference to a secret containing the admin user name and password. Here is how to create it (replace supersecretname and supersecretpassword to the actual credentials):
kubectl -n spoke-cluster create secret generic test-cluster-admin-password --from-literal=username=supersecretname --from-literal=password=supersecretpassword

  • The infraID is obtained from oc get infrastructure cluster -o json | jq .status.infrastructureName

  • The clusterID is obtained from oc get clusterversion version -o json | jq .spec.clusterID

Example:

apiVersion: hive.openshift.io/v1
kind: ClusterDeployment
metadata:
  name: test-cluster
  namespace: spoke-cluster
spec:
  baseDomain: hive.example.com
  clusterInstallRef:
    group: extensions.hive.openshift.io
    kind: AgentClusterInstall
    name: test-agent-cluster-install
    version: v1beta1
  clusterMetadata:
    adminKubeconfigSecretRef:
      name: test-cluster-admin-kubeconfig
    adminPasswordSecretRef:
      name: test-cluster-admin-password
    clusterID: e4affb96-7382-406f-80d6-af01ea9a2c0d
    infraID: da41b06f-5b27-416b-a06c-90f83d316516
  clusterName: test-cluster
  installed: true
  platform:
    agentBareMetal:
      agentSelector:
        matchLabels:
          bla: aaa
  pullSecretRef:
    name: pull-secret