Chapter 3. Recovery for zone-aware HA applications with RWX storage

Applications that are deployed with topologyKey: topology.kubernetes.io/zone, have one or more replicas scheduled in each data zone, and are using shared storage (i.e., RWX cephfs volume) will recover on the active zone within 30-60 seconds for new connections. The short pause is for HAProxy to refresh connections if a router pod is now offline in the failed data zone.

An example of this type of application is detailed in the Install Zone Aware Sample Application section.

Note

When you install the Sample Application, test the failure of a data zone by powering off the OpenShift Container Platform nodes (at least the nodes with OpenShift Container storage devices) to validate that your file-uploader application is available and that new files can be uploaded.