mongod --port 27017 --dbpath data\db1 --replSet replicationSet
mongod --port 27018 --dbpath data\db2 --replSet replicationSet
mongod --port 27019 --dbpath data\db3 --replSet replicationSet
mongod --port 27020 --dbpath data\db4 --replSet replicationSet
mongod --port 27021 --dbpath data\db5 --replSet replicationSet

mongo --host="127.0.0.1:27017"
cfg = rs.conf()
cfg.members[0].host = "127.0.0.1:27017"
rs.reconfig(cfg)

rs.add("127.0.0.1:27018")
rs.add("127.0.0.1:27019")
rs.add("127.0.0.1:27020")
rs.add("127.0.0.1:27021")