Adding a node to the replica set

Assuming you have the node from the previous recipe already running, open a new Terminal.

Start a new replica set node

mongod --dbpath /data/server2/db --replSet MyReplicaSet --port 27018

Connect to the primary server using mongo shell

mongo mongodb://localhost:27017

MyReplicaSet:PRIMARY> rs.status()['members']
[
        {
                "_id" : 0,
                "name" : "localhost:27017",
                "health" : 1,
                "state" : 1,
                "stateStr" : "PRIMARY",
                "uptime" : 890,
                "optime" : {
                        "ts" : Timestamp(1527846941, 1),
                        "t" : NumberLong(1)
                },
                "optimeDate" : ISODate("2018-06-01T09:55:41Z"),
                "electionTime" : Timestamp(1527846189, 2),
                "electionDate" : ISODate("2018-06-01T09:43:09Z"),
                "configVersion" : 1,
                "self" : true
        }
]

Add the new node to the replica set

MyReplicaSet:PRIMARY> rs.add('localhost:27018')
{
        "ok" : 1,
        "operationTime" : Timestamp(1527846991, 1),
        "$clusterTime" : {
                "clusterTime" : Timestamp(1527846991, 1),
                "signature" : {
                        "hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
                        "keyId" : NumberLong(0)
                }
        }
}

MyReplicaSet:PRIMARY> rs.status()['members']
[
        {
                "_id" : 0,
                "name" : "localhost:27017",
                "health" : 1,
                "state" : 1,
                "stateStr" : "PRIMARY",
                "uptime" : 960,
                "optime" : {
                        "ts" : Timestamp(1527847011, 1),
                        "t" : NumberLong(1)
                },
                "optimeDate" : ISODate("2018-06-01T09:56:51Z"),
                "electionTime" : Timestamp(1527846189, 2),
                "electionDate" : ISODate("2018-06-01T09:43:09Z"),
                "configVersion" : 2,
                "self" : true
        },
        {
                "_id" : 1,
                "name" : "localhost:27018",
                "health" : 1,
                "state" : 2,
                "stateStr" : "SECONDARY",
                "uptime" : 30,
                "optime" : {
                        "ts" : Timestamp(1527847011, 1),
                        "t" : NumberLong(1)
                },
                "optimeDurable" : {
                        "ts" : Timestamp(1527847011, 1),
                        "t" : NumberLong(1)
                },
                "optimeDate" : ISODate("2018-06-01T09:56:51Z"),
                "optimeDurableDate" : ISODate("2018-06-01T09:56:51Z"),
                "lastHeartbeat" : ISODate("2018-06-01T09:57:01.043Z"),
                "lastHeartbeatRecv" : ISODate("2018-06-01T09:57:00.150Z"),
                "pingMs" : NumberLong(0),
                "syncingTo" : "localhost:27017",
                "configVersion" : 2
        }
]