Ceph Cluster Helm Chart

Creates Rook resources to configure a Ceph cluster using the Helm package manager. This chart is a simple packaging of templates that will optionally create Rook resources such as:

• CephCluster, CephFilesystem, and CephObjectStore CRs
• Storage classes to expose Ceph RBD volumes, CephFS volumes, and RGW buckets
• Ingress for external access to the dashboard
• Toolbox

Prerequisites¶

• Kubernetes 1.22+
• Helm 3.x
• Install the Rook Operator chart

Installing¶

The helm install command deploys rook on the Kubernetes cluster in the default configuration. The configuration section lists the parameters that can be configured during installation. It is recommended that the rook operator be installed into the rook-ceph namespace. The clusters can be installed into the same namespace as the operator or a separate namespace.

Rook currently publishes builds of this chart to the release and master channels.

Before installing, review the values.yaml to confirm if the default settings need to be updated.

• If the operator was installed in a namespace other than rook-ceph, the namespace must be set in the operatorNamespace variable.
• Set the desired settings in the cephClusterSpec. The defaults are only an example and not likely to apply to your cluster.
• The monitoring section should be removed from the cephClusterSpec, as it is specified separately in the helm settings.
• The default values for cephBlockPools, cephFileSystems, and CephObjectStores will create one of each, and their corresponding storage classes.
• All Ceph components now have default values for the pod resources. The resources may need to be adjusted in production clusters depending on the load. The resources can also be disabled if Ceph should not be limited (e.g. test clusters).

Release¶

The release channel is the most recent release of Rook that is considered stable for the community.

The example install assumes you have first installed the Rook Operator Helm Chart and created your customized values.yaml.

1
2
3

helm repo add rook-release https://charts.rook.io/release
helm install --create-namespace --namespace rook-ceph rook-ceph-cluster \
   --set operatorNamespace=rook-ceph rook-release/rook-ceph-cluster -f values.yaml

Configuration¶

The following table lists the configurable parameters of the rook-operator chart and their default values.

Ceph Cluster Spec¶

The CephCluster CRD takes its spec from cephClusterSpec.*. This is not an exhaustive list of parameters. For the full list, see the Cluster CRD topic.

The cluster spec example is for a converged cluster where all the Ceph daemons are running locally, as in the host-based example (cluster.yaml). For a different configuration such as a PVC-based cluster (cluster-on-pvc.yaml), external cluster (cluster-external.yaml), or stretch cluster (cluster-stretched.yaml), replace this entire cephClusterSpec with the specs from those examples.

Ceph Block Pools¶

The cephBlockPools array in the values file will define a list of CephBlockPool as described in the table below.

Ceph File Systems¶

The cephFileSystems array in the values file will define a list of CephFileSystem as described in the table below.

Ceph Object Stores¶

The cephObjectStores array in the values file will define a list of CephObjectStore as described in the table below.

Existing Clusters¶

If you have an existing CephCluster CR that was created without the helm chart and you want the helm chart to start managing the cluster:

1. Extract the spec section of your existing CephCluster CR and copy to the cephClusterSpec section in values.yaml.

2. Add the following annotations and label to your existing CephCluster CR:

1
2
3
4
5

  annotations:
    meta.helm.sh/release-name: rook-ceph-cluster
    meta.helm.sh/release-namespace: rook-ceph
  labels:
    app.kubernetes.io/managed-by: Helm

1. Run the helm install command in the Installing section to create the chart.

2. In the future when updates to the cluster are needed, ensure the values.yaml always contains the desired CephCluster spec.

Development Build¶

To deploy from a local build from your development environment:

1
2

cd deploy/charts/rook-ceph-cluster
helm install --create-namespace --namespace rook-ceph rook-ceph-cluster -f values.yaml .

Uninstalling the Chart¶

To see the currently installed Rook chart:

1

helm ls --namespace rook-ceph

To uninstall/delete the rook-ceph-cluster chart:

1

helm delete --namespace rook-ceph rook-ceph-cluster

The command removes all the Kubernetes components associated with the chart and deletes the release. Removing the cluster chart does not remove the Rook operator. In addition, all data on hosts in the Rook data directory (/var/lib/rook by default) and on OSD raw devices is kept. To reuse disks, you will have to wipe them before recreating the cluster.

See the teardown documentation for more information.