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Install

Prerequisites

OCM managed multi-cluster setup

Ramen works as part of the OCM hub cluster to orchestrate the placement of workloads and their attachment to PersistentVolumes, on OCM managed clusters.

Ramen hub and Ramen cluster operators hence require an OCM managed multi-cluster setup for their operation.

OCM Managed Cluster supporting VolumeReplication CRD

Ramen works as part of the OCM managed clusters to orchestrate:

  • VolumeReplication resources for all PVCs of a workload
  • Preserving relevant cluster data regarding each PVC that is replicated

VolumeReplication custom resources require storage providers to support CSI extensions that enable managing replication features for provisioned volumes. Ceph-CSI is one such storage provider that supports the required extensions.

Ramen cluster operator hence should be deployed to OCM managed clusters that support VolumeReplication extensions.

S3 store

Ramen preserves cluster data related to PVC resources in an S3 compatible object store. An S3 store endpoint is hence required as part of the setup.

NOTE: Ramen specifically stores PV cluster data for a replicated PVC, to restore the same across peer cluster prior to deploying the PVCs of the workload, this ensures proper binding of the PVC resources to the replicated storage end points.

Operator lifecycle manager (OLM)

Ramen components are provided as OLM catalog sources in the Ramen catalog.

All clusters that require Ramen hub or cluster components installed, require OLM installed on the same.

Kubernetes versions

Kubernetes versions supported are 1.20 or higher.

Tool versions

Installation and deployment require the following tools at specified versions (or higher):

  • kubectl > v1.21

    • kubectl version can be verfied using

      kubectl version

Ramen hub operator

ramen-hub-operator is the controller for managing the life cycle of user created DRPlacementControl (DRPC) Ramen API resources and administrator created DRPolicy Ramen API resources, and is installed on the OCM hub cluster.

Install ramen-hub-operator

To install ramen-hub-operator configure kubectl to use the desired OCM hub cluster and execute:

kubectl apply -k github.com/RamenDR/ramen/config/olm-install/hub/?ref=main

NOTE: By default ramen-hub-operator creates a deployment for its controller in the ramen-system namespace. To verify check the health of the deployment:

kubectl get deployments -n ramen-system ramen-hub-operator

Ramen cluster operator

ramen-dr-cluster-operator is the controller for managing the life cycle of VolumeReplicationGroup Ramen API resources and is installed on the OCM managed clusters.

NOTE: Lifecycle of VolumeReplicationGroup resources are managed by Ramen hub on required OCM managed clusters.

Install ramen-dr-cluster-operator

To install ramen-dr-cluster-operator configure kubectl to use the desired OCM managed cluster and execute:

kubectl apply -k github.com/RamenDR/ramen/config/olm-install/dr-cluster/?ref=main

NOTE: By default ramen-dr-cluster-operator creates a deployment for its controller in the ramen-system namespace. To verify check the health of the deployment:

kubectl get deployments -n ramen-system ramen-dr-cluster-operator