Ceph

Rook Ceph v1.0

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PLEASE NOTE: This document applies to v1.0 version and not to the latest stable release v1.9

Ceph Operator Helm Chart

Installs rook to create, configure, and manage Ceph clusters on Kubernetes.

Introduction

This chart bootstraps a rook-ceph-operator deployment on a Kubernetes cluster using the Helm package manager.

Prerequisites

Kubernetes 1.10+

RBAC

If role-based access control (RBAC) is enabled in your cluster, you may need to give Tiller (the server-side component of Helm) additional permissions. If RBAC is not enabled, be sure to set rbacEnable to false when installing the chart.

# Create a ServiceAccount for Tiller in the `kube-system` namespace
kubectl --namespace kube-system create sa tiller

# Create a ClusterRoleBinding for Tiller
kubectl create clusterrolebinding tiller --clusterrole cluster-admin --serviceaccount=kube-system:tiller

# Patch Tiller's Deployment to use the new ServiceAccount
kubectl --namespace kube-system patch deploy/tiller-deploy -p '{"spec": {"template": {"spec": {"serviceAccountName": "tiller"}}}}'

Installing

The Ceph Operator helm chart will install the basic components necessary to create a storage platform for your Kubernetes cluster. After the helm chart is installed, you will need to create a Rook cluster.

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 (you will install your clusters into separate namespaces).

Rook currently publishes builds of the Ceph operator to the release and master channels.

Release

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

helm repo add rook-release https://charts.rook.io/release
helm install --namespace rook-ceph rook-release/rook-ceph

Master

The master channel includes the latest commits, with all automated tests green. Historically it has been very stable, though it is only recommended for testing. The critical point to consider is that upgrades are not supported to or from master builds.

To install the helm chart from master, you will need to pass the specific version returned by the search command.

helm repo add rook-master https://charts.rook.io/master
helm search rook-ceph
helm install --namespace rook-ceph rook-master/rook-ceph --version <version>

For example:

helm install --namespace rook-ceph rook-master/rook-ceph --version v0.9.0-563.g242e032

Development Build

To deploy from a local build from your development environment:

Build the Rook docker image: make
Copy the image to your K8s cluster, such as with the docker save then the docker load commands

Install the helm chart

cd cluster/charts/rook-ceph
helm install --namespace rook-ceph --name rook-ceph .

Uninstalling the Chart

To uninstall/delete the rook-ceph deployment:

$ helm delete --purge rook-ceph

The command removes all the Kubernetes components associated with the chart and deletes the release.

Configuration

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

Parameter	Description	Default
`image.repository`	Image	`rook/ceph`
`image.tag`	Image tag	`master`
`image.pullPolicy`	Image pull policy	`IfNotPresent`
`rbacEnable`	If true, create & use RBAC resources	`true`
`pspEnable`	If true, create & use PSP resources	`true`
`resources`	Pod resource requests & limits	`{}`
`annotations`	Pod annotations	`{}`
`logLevel`	Global log level	`INFO`
`nodeSelector`	Kubernetes `nodeSelector` to add to the Deployment.
`tolerations`	List of Kubernetes `tolerations` to add to the Deployment.	`[]`
`hostpathRequiresPrivileged`	Runs Ceph Pods as privileged to be able to write to `hostPath`s in OpenShift with SELinux restrictions.	`false`
`agent.flexVolumeDirPath`	Path where the Rook agent discovers the flex volume plugins (*)	`/usr/libexec/kubernetes/kubelet-plugins/volume/exec/`
`agent.libModulesDirPath`	Path where the Rook agent should look for kernel modules (*)	`/lib/modules`
`agent.mounts`	Additional paths to be mounted in the agent container
`agent.mountSecurityMode`	Mount Security Mode for the agent.	`Any`
`agent.toleration`	Toleration for the agent pods
`agent.tolerationKey`	The specific key of the taint to tolerate
`discover.toleration`	Toleration for the discover pods
`discover.tolerationKey`	The specific key of the taint to tolerate
`mon.healthCheckInterval`	The frequency for the operator to check the mon health	`45s`
`mon.monOutTimeout`	The time to wait before failing over an unhealthy mon	`600s`

&ast; For information on what to set agent.flexVolumeDirPath to, please refer to the Rook flexvolume documentation &ast; agent.mounts should have this format mountname1=/host/path:/container/path,mountname2=/host/path2:/container/path2

Command Line

You can pass the settings with helm command line parameters. Specify each parameter using the --set key=value[,key=value] argument to helm install. For example, the following command will install rook where RBAC is not enabled.

$ helm install --namespace rook-ceph --name rook-ceph rook-release/rook-ceph --set rbacEnable=false

Settings File

Alternatively, a yaml file that specifies the values for the above parameters (values.yaml) can be provided while installing the chart.

$ helm install --namespace rook-ceph --name rook-ceph rook-release/rook-ceph -f values.yaml

Here are the sample settings to get you started.

image:
  prefix: rook
  repository: rook/ceph
  tag: v1.0.0
  pullPolicy: IfNotPresent

resources:
  limits:
    cpu: 100m
    memory: 128Mi
  requests:
    cpu: 100m
    memory: 128Mi

rbacEnable: true
pspEnable: true