dbpath=/data/db1 port=27017 replSet=myReplicaSet dbpath=/data/db2 port=27018 replSet=myReplicaSet dbpath=/data/db3 port=27019 replSet=myReplicaSet mongod --config /path/to/config.txt mongo rs.initiate( { _id: "myReplicaSet", version: 1, members: [ { _id: 0, host : "localhost:27017" }, { _id: 1, host : "localhost:27018" }, { _id: 2, host : "localhost:27019" } ] } ) mongod --config /path/to/config.txt mongod --config /path/to/config.txt mongod --config /path/to/config.txt mongo rs.status()