MongoDB Replica Set Connection not created on server - node.js

Question

I am using MongoDB 4.0. I have a Replica Set which run on my machine and different ports that is:
127.0.0.1:27017 (Master)
127.0.0.1:27018 (Slave)
127.0.0.1:27019 (Arbiter)
My replica name is "xdr"
Now on creating the connection on localhost in my nodejs code it will create the connection i.e
const options = {
reconnectInterval: 500, // Reconnect every 500ms
poolSize: 10, // Maintain up to 10 socket connections
autoReconnect : true
};
mongoose.connect('mongodb://localhost:27017, localhost:27018, localhost:27019/my_db?replicaSet=xdr, options);
mongoose.Promise = global.Promise;
//Get the default connection
var db = mongoose.connection;
//Bind connection to error event (to get notification of connection errors)
db.on('error', console.error.bind(console, 'MongoDB connection error:'));
Everything is fine in this on my local connection but when i will host my mongodb On seperate EC2 Instance on AWS, it will not connect to my replica set.
lets assume that my mongodb AWS IP is 12.12.13.12.
So when i will create the connection it will not be able to connect. My code is
const options = {
reconnectInterval: 500, // Reconnect every 500ms
poolSize: 10, // Maintain up to 10 socket connections
autoReconnect : true
};
mongoose.connect('mongodb://12.12.13.12:27017, 12.12.13.12:27018, 12.12.13.12:27019/my_db?replicaSet=xdr, options);
mongoose.Promise = global.Promise;
//Get the default connection
var db = mongoose.connection;
//Bind connection to error event (to get notification of connection errors)
db.on('error', console.error.bind(console, 'MongoDB connection error:'));
It will generate an error i.e ""
if I will connect without replicaset then it will connect only to primary i.e
mongoose.connect('mongodb://12.12.13.12:27017/my_db, options);
Is there anything which I am doing wrong on my code?

Answer 1

Have you verified that port 27017 and 27018 are open on your EC2 ?
You don't need to specify the arbitrer.
You have to inform mongo that you use a replicaset, with the replset option.
I use the following for my replicaset :
var config = {
db: "mongodb://myMasterIp:27017/myDb,mySlave1Ip:27018/myDb"
options: {
user: config.db_user,// only if you use username/password for DB authentication
pass: config.db_pass,// only if you use username/password for DB authentication
replset: {
rs_name: "MyReplicaSetName",
ssl: true,// only if you use ssl for your replicaset
sslValidate:false,// only if you use ssl for your replicaset
sslCA: myDbCertificate,// only if you use ssl for your replicaset
ca: myDbCertificate,// only if you use ssl for your replicaset
sslKey: myDbKey,// only if you use ssl for your replicaset
sslCert: myDbKey // only if you use ssl for your replicaset
},
socketOptions : {
keepAlive : 1,
connectTimeoutMS : 5000
},
server: { // only if you use ssl for your replicaset
ssl: true,
sslValidate:false,
sslCA: myDbCertificate,
ca: myDbCertificate
sslKey: myDbKey,
sslCert: myDbKey
},
auth: { // only if you use username/password for DB authentication
authdb: 'myAuthenticationDatabse'
}
}
};
mongoose.connect(config.db, config.options);