MongoDB all replica set members are "OTHER"? I am setting up a MongoDB replica set using EC2's image: https://aws.amazon.com/marketplace/pp/B00CO7AVMY/ref=dtl_recsim_B007IBMJPI_B00CO7AVMY_3

MongoDB version 2.6.5

I have managed to set up replicaset by not enabling "auth=true" in my config file.

I went ahead to add "auth=true" back into my config file and restarted mongodb on all 3 of my instances.

sudo service mongod restart


After restarting, I got into mongo shell and it is displaying

myReplicaSetName:OTHER&gt;


I am unable to run rs.status() because I don't have a PRIMARY.

 "errmsg" : "not authorized on admin to execute command { replSetGetStatus: 1.0 }"
When you enable authentication you must also specify (at the very least) a keyfile also (see step 1 in the procedure for enabling auth), setting auth=true without a keyfile will mean that the mongod processes will not be able to authenticate with each other (this is what the keyfile is used for).  Hence they cannot communicate, elect a primary, respond to heartbeats etc.

Follow the guide/docs linked above to create and configure a keyfile and your replica set should come up and elect a primary without an issue.