http://engineering.foursquare.com/2011/05/24/fun-with-mongodb-replica-sets/ http://docs.mongodb.org/manual/tutorial/convert-standalone-to-replica-set/   replSet = auxdb fastsync = true rest = true   connecting to: auxdb-0:27017/admin > rs.initiate() // initialize with a fresh replica set config { “info” : “Config now saved locally.  Should come online in about a minute.”, “ok” : 1 } auxdb:PRIMARY> rs.add(“auxdb-1:27017”) // add another node { “ok” : 1 } auxdb:PRIMARY> rs.addArb(“auxdb-arbiter:27017”) // add the arbiter node { “ok” : 1 }  

MongoDB replica set preventing queries to secondary

error:   { “$err” : “not master and slaveOk=false”, “code” : 13435 } solution: rs.slaveOk()