A single zone configuration typically consists of one zone group, containing one zone and one or more RGW instances, where you may load balance gateway client requests between instances. In a single zone configuration, typically, multiple gateway instances point to a single Ceph storage cluster. With the Jewel release, Ceph supports several multi-site configuration options for the Ceph Object Gateway:
- Zone: In a zone, one or more Ceph Object Gateways are logically grouped.
- Zone group: A zone group is a container of multiple zones. In a multi-site configuration there should be a master zone group. All the changes to configurations are handled by the master zone group.
- Realm: A realm can have multiple zone groups. It allows separation of the zone groups themselves between clusters. There can be multiple realms for having different configurations in the same cluster...