Replicaset Config

Run the following command in local

mongod --replSet sdrepl --logpath "log/1.log" --dbpath data/rs1 --port 27017
mongod --replSet sdrepl --logpath "log/2.log" --dbpath data/rs2 --port 27018
mongod --replSet sdrepl --logpath "log/3.log" --dbpath data/rs3 --port 27019

Connect to the first local instance

mongo --port 27017

Create the following javascript object in mongo shell:

rsconfig = { _id: "sdrepl", members:[
          { _id : 0, host : "localhost:27017"},
          { _id : 1, host : "localhost:27018"},
          { _id : 2, host : "localhost:27019"} ]
}

Issue the command:

rs.initiate(rsconfig)

Check the status of the replicaset by issuing:

rs.conf()

The configuration is stored locally (after 1 minute) and you can start the replicaset every time with the same command you run at the beginning of this snippet

This info has been taken from http://docs.mongodb.org/manual/tutorial/deploy-replica-set/