Ceph

PLEASE NOTE: This document applies to v1.7 version and not to the latest stable release v1.9

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 1.13+
Helm 3.x
Preinstalled Rook Operator. See the Helm Operator topic to install.

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.

Release

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

The example install assumes you have created a values-override.yaml.

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-override.yaml

Configuration

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

Parameter	Description	Default
`operatorNamespace`	Namespace of the Rook Operator	`rook-ceph`
`kubeVersion`	Optional override of the target kubernetes version	``
`configOverride`	Cluster ceph.conf override
`toolbox.enabled`	Enable Ceph debugging pod deployment. See toolbox	`false`
`toolbox.tolerations`	Toolbox tolerations	`[]`
`toolbox.affinity`	Toolbox affinity	`{}`
`monitoring.enabled`	Enable Prometheus integration, will also create necessary RBAC rules	`false`
`cephClusterSpec.*`	Cluster configuration, see below	See below
`ingress.dashboard`	Enable an ingress for the ceph-dashboard	`{}`
`cephBlockPools.[*]`	A list of CephBlockPool configurations to deploy	See below
`cephFileSystems.[*]`	A list of CephFileSystem configurations to deploy	See below
`cephObjectStores.[*]`	A list of CephObjectStore configurations to deploy	See below

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.

Ceph Block Pools

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

Parameter	Description	Default
`name`	The name of the CephBlockPool	`ceph-blockpool`
`spec`	The CephBlockPool spec, see the CephBlockPool documentation.	`{}`
`storageClass.enabled`	Whether a storage class is deployed alongside the CephBlockPool	`true`
`storageClass.isDefault`	Whether the storage class will be the default storage class for PVCs. See the PersistentVolumeClaim](https://kubernetes.io/docs/concepts/storage/persistent-volumes/#persistentvolumeclaims) documentation for details.	`true`
`storageClass.name`	The name of the storage class	`ceph-block`
`storageClass.parameters`	See Block Storage documentation or the helm values.yaml for suitable values	see values.yaml
`storageClass.reclaimPolicy`	The default Reclaim Policy to apply to PVCs created with this storage class.	`Delete`
`storageClass.allowVolumeExpansion`	Whether volume expansion is allowed by default.	`true`
`storageClass.mountOptions`	Specifies the mount options for storageClass	`[]`

Ceph File Systems

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

Parameter	Description	Default
`name`	The name of the CephFileSystem	`ceph-filesystem`
`spec`	The CephFileSystem spec, see the CephFilesystem CRD documentation.	see values.yaml
`storageClass.enabled`	Whether a storage class is deployed alongside the CephFileSystem	`true`
`storageClass.name`	The name of the storage class	`ceph-filesystem`
`storageClass.parameters`	See Shared Filesystem documentation or the helm values.yaml for suitable values	see values.yaml
`storageClass.reclaimPolicy`	The default Reclaim Policy to apply to PVCs created with this storage class.	`Delete`
`storageClass.mountOptions`	Specifies the mount options for storageClass	`[]`

Ceph Object Stores

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

Parameter	Description	Default
`name`	The name of the CephObjectStore	`ceph-objectstore`
`spec`	The CephObjectStore spec, see the CephObjectStore CRD documentation.	see values.yaml
`storageClass.enabled`	Whether a storage class is deployed alongside the CephObjectStore	`true`
`storageClass.name`	The name of the storage class	`ceph-bucket`
`storageClass.parameters`	See Object Store storage class documentation or the helm values.yaml for suitable values	see values.yaml
`storageClass.reclaimPolicy`	The default Reclaim Policy to apply to PVCs created with this storage class.	`Delete`

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:

Extract the spec section of your existing CephCluster CR and copy to the cephClusterSpec section in values-override.yaml.
Add the following annotations and label to your existing CephCluster CR:

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

Run the helm install command in the Installing section to create the chart.
In the future when updates to the cluster are needed, ensure the values-override.yaml always contains the desired CephCluster spec.

Development Build

To deploy from a local build from your development environment:

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

Uninstalling the Chart

To see the currently installed Rook chart:

helm ls --namespace rook-ceph

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

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.