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Rook Upgrades

This guide will walk you through the steps to upgrade the software in a Rook cluster from one version to the next. This guide focuses on updating the Rook version for the management layer, while the Ceph upgrade guide focuses on updating the data layer.

Upgrades for both the operator and for Ceph are entirely automated except where Rook's permissions need to be explicitly updated by an admin or when incompatibilities need to be addressed manually due to customizations.

We welcome feedback and opening issues!

Supported Versions

This guide is for upgrading from Rook v1.8.x to Rook v1.9.x.

Please refer to the upgrade guides from previous releases for supported upgrade paths. Rook upgrades are only supported between official releases.

For a guide to upgrade previous versions of Rook, please refer to the version of documentation for those releases.

Important

Rook releases from master are expressly unsupported. It is strongly recommended that you use official releases of Rook. Unreleased versions from the master branch are subject to changes and incompatibilities that will not be supported in the official releases. Builds from the master branch can have functionality changed or removed at any time without compatibility support and without prior notice.

Breaking changes in v1.9

  • Helm charts now define default resource requests and limits for Rook-Ceph Pods. If you use Helm, ensure you have defined an override for these in your values.yaml if you don't wish to use the recommended defaults. Setting resource requests and limits could mean that Kubernetes will not allow Pods to be scheduled in some cases. If sufficient resources are not available, you can reduce or remove the requests and limits.

  • MDS liveness and startup probes are now configured by the CephFilesystem resource instead of CephCluster. Upgrade instructions are below.

  • Rook no longer deploys Prometheus rules from the operator. If you have been relying on Rook to deploy prometheus rules in the past, please follow the upgrade instructions below.

  • Due to a number of Ceph issues and changes, Rook officially only supports Ceph v16.2.7 or higher for CephNFS. If you are using an earlier version, upgrade your Ceph version following the advice given in Rook's v1.8 NFS docs.

Considerations

With this upgrade guide, there are a few notes to consider:

  • WARNING: Upgrading a Rook cluster is not without risk. There may be unexpected issues or obstacles that damage the integrity and health of your storage cluster, including data loss.
  • The Rook cluster's storage may be unavailable for short periods during the upgrade process for both Rook operator updates and for Ceph version updates.
  • We recommend that you read this document in full before you undertake a Rook cluster upgrade.

Patch Release Upgrades

Unless otherwise noted due to extenuating requirements, upgrades from one patch release of Rook to another are as simple as updating the common resources and the image of the Rook operator. For example, when Rook v1.9.6 is released, the process of updating from v1.9.0 is as simple as running the following:

First get the latest common resources manifests that contain the latest changes for Rook v1.9.

git clone --single-branch --depth=1 --branch v1.9.6 https://github.com/rook/rook.git
cd rook/deploy/examples

If you have deployed the Rook Operator or the Ceph cluster into a different namespace than rook-ceph, see the Update common resources and CRDs section for instructions on how to change the default namespaces in common.yaml.

Then apply the latest changes from v1.9 and update the Rook Operator image.

kubectl apply -f common.yaml -f crds.yaml
kubectl -n rook-ceph set image deploy/rook-ceph-operator rook-ceph-operator=rook/ceph:v1.9.6

As exemplified above, it is a good practice to update Rook-Ceph common resources from the example manifests before any update. The common resources and CRDs might not be updated with every release, but K8s will only apply updates to the ones that changed.

Also update optional resources like Prometheus monitoring noted more fully in the upgrade section below.

Helm

  • The minimum supported Helm version is v3.2.0

If you have installed Rook via the Helm chart, Helm will handle some details of the upgrade for you. The upgrade steps in this guide will clarify if Helm manages the step for you.

The rook-ceph helm chart upgrade performs the Rook upgrade. The rook-ceph-cluster helm chart upgrade performs a Ceph upgrade if the Ceph image is updated.

Cluster Health

In order to successfully upgrade a Rook cluster, the following prerequisites must be met:

  • The cluster should be in a healthy state with full functionality. Review the health verification guide in order to verify your cluster is in a good starting state.
  • All pods consuming Rook storage should be created, running, and in a steady state.

Rook Operator Upgrade

In the examples given in this guide, we will be upgrading a live Rook cluster running v1.8.10 to the version v1.9.6. This upgrade should work from any official patch release of Rook v1.8 to any official patch release of v1.9.

Let's get started!

Environment

These instructions will work for as long as you parameterize the environment correctly. With this guide, we do our best not to assume the namespaces in your cluster. Set the following environment variables, which will be used throughout this document.

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# Parameterize the environment
export ROOK_OPERATOR_NAMESPACE=rook-ceph
export ROOK_CLUSTER_NAMESPACE=rook-ceph

1. Update common resources and CRDs

Hint

If you are upgrading via the Helm chart, the common resources and CRDs are automatically updated.

First apply updates to Rook-Ceph common resources. This includes modified privileges (RBAC) needed by the Operator. Also update the Custom Resource Definitions (CRDs).

Get the latest common resources manifests that contain the latest changes.

git clone --single-branch --depth=1 --branch v1.9.6 https://github.com/rook/rook.git
cd rook/deploy/examples

If you have deployed the Rook Operator or the Ceph cluster into a different namespace than rook-ceph, update the common resource manifests to use your ROOK_OPERATOR_NAMESPACE and ROOK_CLUSTER_NAMESPACE using sed.

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sed -i.bak \
    -e "s/\(.*\):.*# namespace:operator/\1: $ROOK_OPERATOR_NAMESPACE # namespace:operator/g" \
    -e "s/\(.*\):.*# namespace:cluster/\1: $ROOK_CLUSTER_NAMESPACE # namespace:cluster/g" \
  common.yaml

Apply the resources.

kubectl apply -f common.yaml -f crds.yaml

Prometheus Updates

If you have Prometheus monitoring enabled, follow the step to upgrade the Prometheus RBAC resources as well.

kubectl apply -f deploy/examples/monitoring/rbac.yaml

Rook no longer deploys Prometheus rules from the operator.

If you use the Helm chart monitoring.enabled value to deploy Prometheus rules, you may now additionally use monitoring.createPrometheusRules to instruct Helm to deploy the rules. You may alternately deploy the rules manually if you wish.

To see the latest information about manually deploying rules, see the Prometheus monitoring docs.

MDS liveness and startup probes

If you configure MDS probes in the CephCluster resource, copy them to the CephFilesystem metadataServer settings at this point. Do not remove them from the CephCluster until after the Rook upgrade is fully complete.

2. Update the Rook Operator

Hint

If you are upgrading via the Helm chart, the operator is automatically updated.

The largest portion of the upgrade is triggered when the operator's image is updated to v1.9.x. When the operator is updated, it will proceed to update all of the Ceph daemons.

kubectl -n $ROOK_OPERATOR_NAMESPACE set image deploy/rook-ceph-operator rook-ceph-operator=rook/ceph:v1.9.6

3. Update Ceph CSI

Hint

If have not customized the CSI image versions, this is automatically updated.

If you have specified custom CSI images, we recommended you update to use the latest Ceph-CSI drivers. See the CSI Custom Images documentation.

Note

If using snapshots, refer to the Upgrade Snapshot API guide.

4. Wait for the upgrade to complete

Watch now in amazement as the Ceph mons, mgrs, OSDs, rbd-mirrors, MDSes and RGWs are terminated and replaced with updated versions in sequence. The cluster may be unresponsive very briefly as mons update, and the Ceph Filesystem may fall offline a few times while the MDSes are upgrading. This is normal.

The versions of the components can be viewed as they are updated:

watch --exec kubectl -n $ROOK_CLUSTER_NAMESPACE get deployments -l rook_cluster=$ROOK_CLUSTER_NAMESPACE -o jsonpath='{range .items[*]}{.metadata.name}{"  \treq/upd/avl: "}{.spec.replicas}{"/"}{.status.updatedReplicas}{"/"}{.status.readyReplicas}{"  \trook-version="}{.metadata.labels.rook-version}{"\n"}{end}'

As an example, this cluster is midway through updating the OSDs. When all deployments report 1/1/1 availability and rook-version=v1.9.6, the Ceph cluster's core components are fully updated.

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Every 2.0s: kubectl -n rook-ceph get deployment -o j...

rook-ceph-mgr-a         req/upd/avl: 1/1/1      rook-version=v1.9.6
rook-ceph-mon-a         req/upd/avl: 1/1/1      rook-version=v1.9.6
rook-ceph-mon-b         req/upd/avl: 1/1/1      rook-version=v1.9.6
rook-ceph-mon-c         req/upd/avl: 1/1/1      rook-version=v1.9.6
rook-ceph-osd-0         req/upd/avl: 1//        rook-version=v1.9.6
rook-ceph-osd-1         req/upd/avl: 1/1/1      rook-version=v1.8.10
rook-ceph-osd-2         req/upd/avl: 1/1/1      rook-version=v1.8.10

An easy check to see if the upgrade is totally finished is to check that there is only one rook-version reported across the cluster.

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# kubectl -n $ROOK_CLUSTER_NAMESPACE get deployment -l rook_cluster=$ROOK_CLUSTER_NAMESPACE -o jsonpath='{range .items[*]}{"rook-version="}{.metadata.labels.rook-version}{"\n"}{end}' | sort | uniq
This cluster is not yet finished:
  rook-version=v1.8.10
  rook-version=v1.9.6
This cluster is finished:
  rook-version=v1.9.6

5. Verify the updated cluster

At this point, your Rook operator should be running version rook/ceph:v1.9.6.

Verify the Ceph cluster's health using the health verification doc.

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