MongoDB replica set preventing queries to secondary

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rs.slaveOk() run in the mongo shell will allow you to read from secondaries. Here is a demonstration using the mongo shell under MongoDB 2.4.3:

$ mongo --port 27017
MongoDB shell version: 2.4.3
connecting to: 127.0.0.1:27017/test
replset:PRIMARY> db.foo.save({})
replset:PRIMARY> db.foo.find()
{ "_id" : ObjectId("51bf5dbd473d5e80fc095b17") }
replset:PRIMARY> exit

$ mongo --port 27018
MongoDB shell version: 2.4.3
connecting to: 127.0.0.1:27018/test
replset:SECONDARY> db.foo.find()
error: { "$err" : "not master and slaveOk=false", "code" : 13435 }
replset:SECONDARY> rs.slaveOk()
replset:SECONDARY> db.foo.find()
{ "_id" : ObjectId("51bf5dbd473d5e80fc095b17") }
replset:SECONDARY> db.foo.count()
1

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