mongodb, replicates and error: { “$err” : “not master and slaveOk=false”, “code” : 13435 }

Question

I tried mongo replica sets for the first time. I am using ubuntu on ec2 and I booted up three instances. I used the private IP address of each of the instances. I picked on as the primary and below is the code. mongo --host Private IP Address rs.initiate() rs.add(“Private IP Address”) rs.addArb(“Private IP Address”) All at this point is fine. When I go to the http://ec2-xxx-xxx-xxx-xxx.compute-1.amazonaws.com:28000/_replSet site I see that I have a primary, secondary, and arbitrary. Ok, now for a test. On the primary create a database in this is the code: use tt db.tt.save( { a : 123 } ) on the secondary, I then do this and get the below error: db.tt.find() error: { "$err" : "not master and slaveOk=false", "code" : 13435 } I am very new to MongoDB and replicates but I thought that if I do something in one, it goes to the other. So, if I add a record in one, what do I have to do to replicate across machines? Select the correct answer from above options

Answer 1

Mongo shell has to know that you are allowing read operations from secondaries, this means you have to set “slave okay”. Do this: rs.slaveOk() So, you only need to do this when you query secondaries and need to be used only once per session. After this, you can normally query secondaries.