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Chapter 12. Disaster Recovery with stretch cluster

In this case, a single cluster is stretched across two zones with a third zone as the location for the arbiter. This feature is currently intended for deployment in the OpenShift Container Platform on-premises and in the same location. This solution is not recommended for deployments stretching over multiple data centers. Instead, consider Metro-DR as a first option for no data loss DR solution deployed over multiple data centers with low latency networks.

Note

The stretch cluster solution is designed for deployments where latencies do not exceed 10 ms maximum round-trip time (RTT) between the zones containing data volumes. For Arbiter nodes follow the latency requirements specified for etcd. Contact Red Hat Customer Support if you are planning to deploy with higher latencies.

To use the stretch cluster,

  • You must have a minimum of five nodes across three zones, where:

    • Two nodes per zone are used for each data-center zone, and one additional zone with one node is used for arbiter zone (the arbiter can be on a master node).

  • All the nodes must be manually labeled with the zone labels prior to cluster creation.

    For example, the zones can be labeled as:

    • topology.kubernetes.io/zone=arbiter (master or worker node)
    • topology.kubernetes.io/zone=datacenter1 (minimum two worker nodes)
    • topology.kubernetes.io/zone=datacenter2 (minimum two worker nodes)

For more information on configuring OpenShift Data Foundation for stretch cluster, see the Configuring OpenShift Data Foundation disaster recovery for OpenShift workloads guide.

Important

You can now easily set up disaster recovery with stretch cluster for workloads based on OpenShift virtualization technology using OpenShift Data Foundation. For more information, see the OpenShift Virtualization in OpenShift Container Platform guide.

Additional resources

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