第 4 章 Regional-DR solution for OpenShift Data Foundation
4.1. Components of Regional-DR solution
Regional-DR is composed of Red Hat Advanced Cluster Management for Kubernetes and OpenShift Data Foundation components to provide application and data mobility across Red Hat OpenShift Container Platform clusters.
Red Hat Advanced Cluster Management for Kubernetes
Red Hat Advanced Cluster Management (RHACM) provides the ability to manage multiple clusters and application lifecycles. Hence, it serves as a control plane in a multi-cluster environment.
RHACM is split into two parts:
- RHACM Hub: components that run on the multi-cluster control plane.
- Managed clusters: components that run on the clusters that are managed.
For more information about this product, see RHACM documentation and the RHACM “Manage Applications” documentation.
OpenShift Data Foundation
OpenShift Data Foundation provides the ability to provision and manage storage for stateful applications in an OpenShift Container Platform cluster.
OpenShift Data Foundation is backed by Ceph as the storage provider, whose lifecycle is managed by Rook in the OpenShift Data Foundation component stack. Ceph-CSI provides the provisioning and management of Persistent Volumes for stateful applications.
OpenShift Data Foundation stack is now enhanced with the following abilities for disaster recovery:
- Enable RBD block pools for mirroring across OpenShift Data Foundation instances (clusters)
- Ability to mirror specific images within an RBD block pool
- Provides csi-addons to manage per Persistent Volume Claim (PVC) mirroring
OpenShift DR
OpenShift DR is a set of orchestrators to configure and manage stateful applications across a set of peer OpenShift clusters which are managed using RHACM and provides cloud-native interfaces to orchestrate the life-cycle of an application’s state on Persistent Volumes. These include:
- Protecting an application and its state relationship across OpenShift clusters
- Failing over an application and its state to a peer cluster
- Relocate an application and its state to the previously deployed cluster
OpenShift DR is split into three components:
- ODF Multicluster Orchestrator: Installed on the multi-cluster control plane (RHACM Hub), it orchestrates configuration and peering of OpenShift Data Foundation clusters for Metro and Regional DR relationships
- OpenShift DR Hub Operator: Automatically installed as part of ODF Multicluster Orchestrator installation on the hub cluster to orchestrate failover or relocation of DR enabled applications.
- OpenShift DR Cluster Operator: Automatically installed on each managed cluster that is part of a Metro and Regional DR relationship to manage the lifecycle of all PVCs of an application.
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