Red Hat SummitChapter 12. ClusterClaims
A ClusterClaim is a cluster-scoped custom resource definition (CRD) on a managed cluster. A ClusterClaim represents a piece of information that a managed cluster claims. The following example shows a claim that is identified in the YAML file:
apiVersion: cluster.open-cluster-management.io/v1alpha1
kind: ClusterClaim
metadata:
name: id.openshift.io
spec:
value: 95f91f25-d7a2-4fc3-9237-2ef633d8451cThe following table shows the defined ClusterClaims that might be on a cluster that Red Hat Advanced Cluster Management for Kubernetes manages:
| Claim name | Reserved | Mutable | Description |
|---|---|---|---|
|
| true | false | ClusterID defined in upstream proposal |
|
| true | true | Kubernetes version |
|
| true | false | Platform the managed cluster is running on, like AWS, GCE, and Equinix Metal |
|
| true | false | Product name, like OpenShift, Anthos, EKS and GKE |
|
| false | false | OpenShift Container Platform external ID, which is only available for an OpenShift Container Platform cluster |
|
| false | true | URL of the management console, which is only available for an OpenShift Container Platform cluster |
|
| false | true | OpenShift Container Platform version, which is only available for an OpenShift Container Platform cluster |
If any of the previous claims are deleted or updated on managed cluster, they are restored or rolled back to a previous version automatically.
After the managed cluster joins the hub, the ClusterClaims that are created on a managed cluster are synchronized with the status of the ManagedCluster resource on the hub. A managed cluster with ClusterClaims might look similar to the following example:
apiVersion: cluster.open-cluster-management.io/v1
kind: ManagedCluster
metadata:
labels:
cloud: Amazon
clusterID: 95f91f25-d7a2-4fc3-9237-2ef633d8451c
installer.name: multiclusterhub
installer.namespace: open-cluster-management
name: cluster1
vendor: OpenShift
name: cluster1
spec:
hubAcceptsClient: true
leaseDurationSeconds: 60
status:
allocatable:
cpu: '15'
memory: 65257Mi
capacity:
cpu: '18'
memory: 72001Mi
clusterClaims:
- name: id.k8s.io
value: cluster1
- name: kubeversion.open-cluster-management.io
value: v1.18.3+6c42de8
- name: platform.open-cluster-management.io
value: AWS
- name: product.open-cluster-management.io
value: OpenShift
- name: id.openshift.io
value: 95f91f25-d7a2-4fc3-9237-2ef633d8451c
- name: consoleurl.openshift.io
value: 'https://console-openshift-console.apps.xxxx.dev04.red-chesterfield.com'
- name: version.openshift.io
value: '4.5'
conditions:
- lastTransitionTime: '2020-10-26T07:08:49Z'
message: Accepted by hub cluster admin
reason: HubClusterAdminAccepted
status: 'True'
type: HubAcceptedManagedCluster
- lastTransitionTime: '2020-10-26T07:09:18Z'
message: Managed cluster joined
reason: ManagedClusterJoined
status: 'True'
type: ManagedClusterJoined
- lastTransitionTime: '2020-10-30T07:20:20Z'
message: Managed cluster is available
reason: ManagedClusterAvailable
status: 'True'
type: ManagedClusterConditionAvailable
version:
kubernetes: v1.18.3+6c42de812.1. List existing ClusterClaims
You can use the kubectl command to list the ClusterClaims that apply to your managed cluster. This is helpful when you want to compare your ClusterClaim to an error message.
Note: Make sure you have list permission on resource clusterclaims.cluster.open-cluster-management.io.
Run the following command to list all existing ClusterClaims that are on the managed cluster:
kubectl get clusterclaims.cluster.open-cluster-management.io12.2. Create custom ClusterClaims
You can create ClusterClaims with custom names on a managed cluster, which makes it easier to identify them. The custom ClusterClaims are synchronized with the status of the ManagedCluster resource on the hub cluster. The following content shows an example of a definition for a customized ClusterClaim:
apiVersion: cluster.open-cluster-management.io/v1alpha1
kind: ClusterClaim
metadata:
name: <custom_claim_name>
spec:
value: <custom_claim_value>
The max length of field spec.value is 1024. The create permission on resource clusterclaims.cluster.open-cluster-management.io is required to create a ClusterClaim.
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