gistfile1.js

configS2 = {
     "_id" : "s2",
     "members" : [
        {
           "_id" : 1,
           "host" : "localhost:47017"
        },
        {
           "_id" : 2,
           "host" : "localhost:47018"
        },
        {
           "_id" : 3,
           "host" : "localhost:47019"
 }
     ]
};
rs.initiate(configS2);