%rs.conf()%: get current configuration %rs.initiate(cfg)%: initiate replica set %rs.reconfig(cfg)%: reconfigure a replica set %rs.add("hostname:port")%: add a new member %rs.addArb("hostname:port")%: add a new arbiter %rs.remove("hostname:port")%: remove a member

%rs.status()%: Reports status of the replica set from one node's point of view %rs.stepDown(secs)%: Request the primary to step down %rs.freeze(secs)%: Prevents any changes to the current replica set configuration (primary/secondary status); Use during backups