Pulling a realm
Pull a realm from the node containing the master zone group and master zone to a node containing a secondary zone group or zone.
To pull a realm from the node containing the master zone group and master zone to a node containing a secondary zone group or zone, run the realm pull command on the node that will receive the realm configuration.
Syntax
radosgw-admin realm pull --url=URL_TO_MASTER_ZONE_GATEWAY--access-key=ACCESS_KEY --secret=SECRET_KEY